Updated on 2022/09/26

写真a

 
FUJII Masahiro
 
Organization
Faculty of Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Doctor of Engineering ( Osaka University )

Research Interests

  • Tribology of Machine Element

  • Design of Machine Element

  • 機械要素のトライボロジー

  • 機械要素設計

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering

Research History

  • - Professor,Graduate School of Natural Science and Technology,Okayama University

    2004

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  • - 岡山大学自然科学研究科 教授

    2004

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Professional Memberships

 

Papers

  • Effect of boron addition on the gear fatigue strength of Fe-Ni-Mo-B-C sintered alloys Reviewed

    Shigeki EGASHIRA, Tomoyuki ISHIMINE, Tomoyuki UENO, Masahiro FUJII

    Mechanical Engineering Journal   9 ( 1 )   21 - 00303   2022

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/mej.21-00303

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  • Effect of Mechanical Surface Treatment and Post-Treatment Polishing on Tensile Strength and Fatigue Life of High-Speed Tool Steel Reviewed

    N.Kurunathilaka, N.Tada, T.Uemori, J.Sakamoto, R.Hanamitsu, M.Fujii, Y.Omiya, M.Kawano

    International Journal of Peening Science and Technology   2   35 - 60   2021.9

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  • Effect of Mechanical Surface Treatment and post-Treatment polishing on Tensile Strength and Fatigue Life of High-Speed Tool Steel Reviewed

    N.Karunathilaka, N.Tada, T.Uemori, J.Sakamoto, R.Hanamitsu, M.Fujii, Y.Omiya, M.Kawano

    International Journal of Peening Science and Technology   2 ( 1 )   35 - 60   2021.8

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  • Strength characterization of adhesive joint surface treated by large-area EB irradiation Reviewed

    Yuya Omiya, Kenji Toyota, Ryota Nakanishi, Togo Shinonaga, Tadashi Shiota, Akira Okada, Masahiro Fujii

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   15 ( 4 )   1 - 10   2021

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    With recent improvements in adhesive performance, adhesive joints are being increasingly used in various industrial fields. Despite their advantage of joining dissimilar adherends, adhesive joints are considered unsuitable for key components of mechanical structures due to their large variation in joint strengths. There are many factors that affect the strength of adhesive joints. However, the general bonding mechanisms are (1) mechanical, (2) physical, and (3) chemical bonding. The adhesion mechanism is complex because these phenomena occur simultaneously. Thus, it is necessary to consider these factors separately. Moreover, it is important to understand the bonding mechanism of interfaces in adhesive joints and to improve the reliability of the joint strength. In this study, the tensile strengths of single lap joints were measured to investigate the influence of large-area EB irradiation on strength characterization of adhesive joints. Aluminum alloy plates (A6061) were used as the adherend. Other surface treatments, which were sanding by emery paper, shot blast, and plasma irradiation, were also conducted for comparisons. Each treated surface of the adhered was examined with respect to the surface profile, wettability, and surface analysis by XPS. Results showed that the wettability of treated surfaces of adherend improved, and tensile strength of surface treated adhesive joints was also improved compared with that of the non-treated specimen. Specifically, the strength of the joint with EB irradiation was 1.9 times larger than that of the non-treated specimen. Finally, the effect of large-area EB irradiation on adhesive characterization was discussed.

    DOI: 10.1299/jamdsm.2021jamdsm0052

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  • Tribological properties in water of silica coatings on stainless steel substates

    SHIOMI Ko, SHIOTA Tadashi, OMIYA Yuya, FUJII Masahiro

    The Proceedings of Conference of Chugoku-Shikoku Branch   2021.59   05b2   2021

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecs.2021.59.05b2

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  • Effect of laser peened dimples on friction characteristics

    FUJII Masahiro, SHIOTA Tadashi, OMIYA Yuya, KOBUCHI Saeko

    The Proceedings of Conference of Chugoku-Shikoku Branch   2021.59   05c2   2021

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecs.2021.59.05c2

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  • Influence of Surface Roughness on Behavior of Angle Control Tightening

    GEMBA Nobuyoshi, OTAKE Ryohei, MOROZUMI Yukio, OMIYA Yuya, SHIOTA Tadashi, FUJII Masahiro

    The Proceedings of Conference of Chugoku-Shikoku Branch   2021.59   04c4   2021

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    DOI: 10.1299/jsmecs.2021.59.04c4

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  • Application of Wood-Derived Nanocarbon Materials to Rubber and their Mechanical Properties

    Peng Lyuan, Omiya Yuya, Shiota Tadashi, Fujii Masahiro

    The Proceedings of Conference of Chugoku-Shikoku Branch   2021.59   03c1   2021

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecs.2021.59.03c1

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  • Effect of boron addition on the rolling contact fatigue strength of Fe-Ni-Mo-B-C sintered alloys Reviewed

    Shigeki Egashira, Takashi Sekiya, Tomoyuki Ishimine, Tomoyuki Ueno, Masahiro Fujii

    MECHANICAL ENGINEERING JOURNAL   7 ( 3 )   1 - 13   2020

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    Sintered materials are superior in productivity because of their simple process, but they are not applied to high-load gears because of their insufficient strength. To improve the fatigue strength of sintered materials, the authors have developed liquid-phase sintering which can achieve high-density without using secondary processing. In this study, the effect of boron addition (0-0.4 mass%) on the rolling contact fatigue strength of Fe-Ni-Mo-B-C sintered and carburized material was evaluated. In addition, in order to evaluate only the boron addition effect excluding the influence of density, the sintered density of each specimen was controlled to be the same. In the test range of this study, the rolling contact fatigue limit (p(max))(lim) of material with an additional quantity of boron of 0.1 mass% showed the highest value exceeding 1700 MPa. This value was not only significantly higher than the (p(max))(lim) of the boron-free material (1100 MPa), but also an extremely high value comparable to the (p(max))(lim) of wrought steel (1900 MPa). The reason why the (p(max))(lim) of a 0.1B roller was remarkably high was investigated from the viewpoints of both pore structure and material structure. As for the pore structure, the pore shape of the boron-free roller was irregular, whereas the pore shape of the 0.1B roller was spherical. As a result of CAE analysis of the orthogonal shear stress inside the roller during the rolling contact fatigue test, it was found that the maximum value of orthogonal shear stress around the pores of the 0.1B roller was about 35 % lower than that of the boron-free roller. This result suggests that cracks are less likely to occur in the 0.1B roller than in the boron-free roller. In other words, it is thought that the pore shape of 0.1B material affects the improvement of rolling contact fatigue strength.

    DOI: 10.1299/mej.20-00057

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  • Effect of Surface Characterization Induced by Fine Shot Peening on Scuffing of Steel Roller Reviewed

    Y Omiya, M Fujii, H Sekishita, K Ishimoto, A Ueda

    VDI-Berichte   2355   37 - 46   2019.9

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  • Improvement of Gear Life and Tribological Properties by Applying DLC Film Reviewed

    Yoshiharu Utsumi, Masahiro Fujii, Seitaro Takeno, Shinya Fujii, Hideki Moriguchi

    International Tribology Conference Sendai 2019   2019.9

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  • Effect of Lubrication and Forging Load on Surface Roughness, Residual Stress, and Deformation of Cold Forging Tools Reviewed

    Nuwan Karunathilaka, Naoya Tada, Takeshi Uemori, Ryota Hanamitsu, Masahiro Fujii, Yuya Omiya, Masahiro Kawano

    METALS   9 ( 7 )   1 - 12   2019.7

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    Cold forging is a metal forming that which uses localized compressive force at room temperature. During the cold forging process, the tool is subjected to extremely high loads and abrasive wear. Lubrication plays an important role in cold forging to improve product quality and tool life by preventing direct metallic contact. Surface roughness and residual stress also greatly affects the service life of a tool. In this study, variations in surface roughness, residual stress, and specimen deformation with the number of cold forging cycles were investigated under different forging conditions. Specimens that were made of heat-treated SKH51 (59-61 HRC), a high-speed tool steel with a polished working surface, were used. The specimens were subjected to an upsetting process. Compressive residual stress, surface roughness, and specimen deformation showed a positive relationship with the number of forging cycles up to a certain limit and became almost constant in most of the forging conditions. A larger change in residual stress and surface roughness was observed at the center of the specimens in all the forging conditions. The effect of the magnitude of the forging load on the above discussed parameters is large when compared to the effect of the lubrication conditions.

    DOI: 10.3390/met9070783

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  • Influence of Tightening Speed on Rapture of Screw Threads Reviewed

    Yuya Omiya, Hayaki Kawaguchi, Tadashi Shiota, Masahiro Fujii

    Proceedings of The 8th International Conference on Manufacturing, Machine Design and Tribology   1 - 2   2019.4

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  • Tribological behavior of silicon carbide coatings films for ceramic-on-ceramic artificial joints Reviewed

    Tadashi Shiota, Miho Akiyama, Daiki Taniya, Yuya Omiya, Toshiyuki Ikoma, Masahiro Fujii

    Proceedings of The 8th International Conference on Manufacturing, Machine Design and Tribology   1 - 2   2019.4

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  • Effect of boron addition on mechanical properties of Fe-Ni-Mo-B-C sintered alloys Reviewed

    Shigeki Egashira, Takashi Sekiya, Tomoyuki Ueno, Masahiro Fujii

    MECHANICAL ENGINEERING JOURNAL   6 ( 6 )   1 - 11   2019

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    Sintered materials are superior in productivity because of their simple process, but their mechanical properties are low. To improve the mechanical properties of sintered materials, we focus on liquid-phase sintering. In this study, we selected boron as sintering aids and evaluated on the effect of the addition quantity of boron (0-0.6 mass%) to the mechanical properties of liquid-phase sintered and heat-treated materials. In the test range of this study, the tensile strength of material with an additional quantity of boron of 0.1 mass% showed the highest value, 1386 MPa, which is about 35% higher compared to the tensile strength of material without adding boron. On the other hand, materials with an additional quantity of boron of 0.2 mass% or higher showed higher-density than material with an additional quantity of boron of 0.1 mass%, but both their elongation and tensile strength were significantly decreased. The precipitates changed between the boundary of the quantity of boron added of 0.1 and that of 0.2 mass%. Only Fe 23 B 6 was formed in the material with the boron addition amount of 0.1 mass% or less, and Fe23B6 and Fe2B were formed in the material with the boron addition amount of 0.2 mass% or more. By cross-sectional observation of the test specimen after the tensile test, it was confirmed that in the material with the boron addition amount of 0.2 mass% or more cracks occurred and propagated at the Fe23B6/Fe2B interface and finally resulted in fracture. In the material with the boron addition amount of 0.1 mass%, however, such a fracture was not confirmed. The phenomena could be explained the fact that the mechanical properties were sharply changed between the quantity of boron added of 0.1 mass% and 0.2 mass%. The existence of Fe23B6/Fe2B interface would significantly affect the strength of the liquid-phase sintered materials.

    DOI: 10.1299/mej.19-00297

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  • ナットのはめ合い状態がねじ部応力分布に及ぼす影響 Reviewed

    大宮祐也,田村直樹,藤井正浩

    圧力技術   56 ( 5 )   259 - 267   2018.10

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  • Effects of the Metal Surface Profile to the Sliding properties between Rubber and Metal and Applying that to Wheel Bearing Seals Reviewed

    2018-01 ( 1904 )   1 - 6   2018.10

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  • Influence of Surface Properties Modified with Fine Shot Peening on Scuffing

    Yuya Omiya, Masahiro Fujii, Ryo Ochiai, Koshi Ishimoto, Akihiro Ueda

    Journal of Surface Engineered Materials and Advanced Technology   8 ( 3 )   58 - 69   2018

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  • プラテンを用いた漏えい試験による金属平型ガスケット単体の密封性能評価

    大宮祐也,藤井正浩,柴井裕太

    圧力技術   56 ( 3 )   120 - 127   2018

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  • Influence of density and nickel content on fatigue strength of powder-forged gears - Comparison with ingot steel and sintered steel

    Masanori Seki, Masahiro Fujii

    Journal of Advanced Mechanical Design, Systems and Manufacturing   11 ( 6 )   449 - 455   2017.11

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Japan Society of Mechanical Engineers  

    In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-Tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. The densities of the sintered and powder-forged rollers and gears were in the range 7.01 g/cm3 to 7.84 g/cm3, and the nickel contents of the metal powders were chosen as 0.5 % and 3.0 %. These experimental results were compared with the results for ingot steel ones. The hardness near the surface of the test specimens with a nickel content of 3.0 % was lower than that of the other ones. The pores in the sintered rollers became smaller or disappeared upon hot forging. The failure modes of the rollers and gears were mainly spalling due to subsurface cracking and pitting due to surface cracking, respectively. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones, respectively. The fatigue strength of the test specimens increased as their density increased. It was clear that the fatigue strength of the sintered and powder-forged rollers and gears was proportional to the hardness at the failure depth for nickel contents of 0.5 % and 3.0 %. In other words, the fatigue strength of the rollers and gears with a nickel content of 3.0 % was similar to those of the others because of the toughness effect of nickel under the same material density.

    DOI: 10.1299/jamdsm.2017jamdsm0073

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  • CORRELATION ON SCATTER BETWEEN TORQUE COEFFICIENT AND BOLT PRELOAD IN PIPE FLANGE CONNECTION

    Yuya Omiya, Masahiro Fujii

    PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2016, VOL 2   PVP2016-63720   1 - 8   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER SOC MECHANICAL ENGINEERS  

    In this paper, a mechanism of variation in axial bolt force in pipe flange connection during bolt tightening process is investigated. Especially, Correlation between torque coefficient and bolt preload is investigated. The actual pipe flange connection is tightened by a wrench due to the torque control method. Axial bolt forces were measured in the tightening process. The three types of gasket are chosen in this paper. As a result the good relationships are seen between torque coefficient and axial bolt force. The effect of gasket material on the relationships between torque coefficient and bolt preload is not seen.

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  • INFLUENCE OF DENSITY ON FATIGUE STRENGTH OF SINTERED AND POWDER-FORGED GEARS

    SEKI Masanori, FUJII Masahiro

    The Proceedings of the JSME international conference on motion and power transmissions   2017   1 - 5   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Japan Society of Mechanical Engineers  

    <p>In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. These experimental results were compared with the results of ingot steel ones. The hardness near the surface of the test specimens with higher nickel content was smaller than that of the other ones. The pores in the sintered rollers became smaller or were disappeared by the hot forging. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was roughly equivalent to that of the ingot steel ones. The fatigue strength of the test specimens increased as their density increased, and was hardly influenced by the nickel content in this experimental range. It was clear that the fatigue strength of the sintered and the powder-forged rollers and gears was proportional to the hardness at the failure depth for each nickel content.</p>

    DOI: 10.1299/jsmeimpt.2017.05-03

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  • INFLUENCE OF SURFACE PROFILE MODIFIED WITH FINE SHOT PEENING ON SCUFFING IN ROLLING-SLIDING CONTACT ELEMENT

    FUJII Masahiro, OMIYA Yuya, OCHIAI Ryo, ISHIMOTO Koshi, UEDA Akihiro

    The Proceedings of the JSME international conference on motion and power transmissions   2017   1 - 5   2017

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:The Japan Society of Mechanical Engineers  

    <p>Recently, the gear is required of high strength, reliability, and surface damage resistance under severe service condition to achieve the weight saving and downsizing of a product. It is necessary to understand the influence of the surface profile on the scuffing resistance. The shot peening is able to form the arbitrary surface profile with the changes of peening conditions to the metal surface. When the effective surface profile will be found to increase the lubrication property, the metal surface will be obtained with both the surface strength and the surface lubricity. In this paper, the influence of surface profile with the fine shot peening, which is able to form the arbitrary surface profile, on the scuffing resistance in the rolling-slipping contact machine element was investigated. The scuffing test using the two cylinder rolling contact test machine was carried out. The test rollers processed with shot peening were used in the scuffing test.</p>

    DOI: 10.1299/jsmeimpt.2017.07-11

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  • FEM Analysis on Creep Deformation and Axial Bolt Force Change in Threaded Fasteners at Elevated Temperature

    Yuya Omiya, Tadatoshi Watanabe, Masahiro Fujii, Haruka Yamamoto

    PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2016, VOL. 2   1 - 8   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER SOC MECHANICAL ENGINEERS  

    In this study, the creep deformation in the threaded joint are discussed using a finite element method, and evaluated the influence of the dimensions of bolt and clamped parts. The stress and creep strain distributions are calculated using the Finite Element Analysis. The occurrence and the propagation of the creep deformation and influence of the creep deformation on the axial bolt force were discussed. It was found that the creep deformation occurred at the bearing surfaces and the engagement screw thread mainly at the elevated temperature. The creep deformation was a cause of the reduction in axial bolt force.

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  • Dependence of ph level on tribological effect of graphene oxide as an additive in water lubrication

    A. A. Alias, H. Kinoshita, Y. Nishina, M. Fujii

    International Journal of Automotive and Mechanical Engineering   13 ( 1 )   3150 - 3156   2016.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Universiti Malaysia Pahang  

    A study of the effectiveness of graphene oxides (GO) dispersed in water as a lubricant additive between tungsten carbide (WC) pin against stainless steel (SUS304) plate was carried out. A 0.1 wt.% GO was prepared and used as a lubricant under an applied load of 3 N for 20,000 friction cycles of reciprocating tribological testing. The results show that a GO dispersion with pH 3 provided the lowest friction coefficient, which was approximately 0.05. Worn areas on the wear track of the SUS304 flat plate and WC ball surface were also small. The increasing pH obviously affected the tribological properties, where the friction coefficient increased to approximately 0.10-0.20 in the steady state for pH 5, pH 7 and pH 9. Meanwhile, a GO dispersion with pH 10 was not able to provide good tribological properties for the tested materials. The observations on microscopic images revealed the formation of tribofilms on the wear tracks for low pH. The tribofilms caused reduction of the friction force and protected the plates from severe wear during the sliding tests.

    DOI: 10.15282/ijame.13.1.2016.2.0262

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  • Observation of Residual Stress Variation on Rolling Fatigue of Steel Ball

    61 ( 6 )   393 - 400   2016.6

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    DOI: 10.18914/tribologist.61.6_393

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  • Electrical contact resistance performance of precious-metal-electroplated carbon nanotube films under micro loads

    Yusuke Yukiyoshi, Yuma Yokoi, Hiroshi Kinoshita, Masahiro Fujii

    MECHANICAL ENGINEERING JOURNAL   3 ( 5 )   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    Radio frequency-microelectromechanical system (RF-MEMS) switches, which use physical Ohmic contacts, are recently focused for high performance in the high-frequency ranges. Typically, the contact areas of the electrodes in RF-MEMS switches are less than 0.01 mm(2), and they generate just very low normal loads of less than 1 mN. The limited real contact area of the electrodes leads to high electrical contact resistances and wear on the switches. Carbon nanotube (CNT) films, formed with many vertically aligned CNTs on a silicon substrate, are one candidate electrode material for RF-MEMS switches. However, CNT films have a high electrical contact resistance with metals. In this study, precious-metal electroplating (Ag, Au, Pt, Rh, and Cu) on CNT films was performed to decrease the electrical contact resistances of the films and increase their wear resistances. The contact resistances of the electroplated CNT films as a function of normal loads up to 1 mN were measured by phi 2 mm Cu balls. In this study, the Ag-electroplated CNT film with a hydrogen annealing had the lowest electrical contact resistance of 0.10 Omega. Durability experiments of cyclic connection switching were conducted under direct applied voltages of 3 V or 10 V between the films and Cu balls, and with a load of 1 mN for 3 x 10(5) cycles. The electrical contact resistance of the Ag-electroplated CNT film with the hydrogen annealing was stable during this durability experiment.

    DOI: 10.1299/mej.15-00346

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  • Tribological Behavior of Thermally Sprayed WC Coatings under Water Lubrication

    Chaoqun Zhang, Masahiro FUJII

    7   527 - 541   2016

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  • Tribological properties of graphene oxide as a lubricating additive in water and lubricating oils

    Hiroshi KINOSHITA, Hideki ONO, Aidil Azli ALIAS, Yuta NISHINA, Masahiro FUJII

    Bulletin of the JSME Mechanical Engineering Journal   2 ( 9 )   1 - 7   2015.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS  

    High-performance lubricating additives are desired in order to improve the properties of lubricating fluids. Recently, carbon nanomaterials such as fullerenes, carbon nanotubes, and carbon onions have been studied as lubricating additives for water and lubricating oils. However, the costs of these carbon nanomaterials are too high for practical use. On the other hand, graphene oxide (GO) is a carbon nanomaterial that consists of single atom thick sheets that possess a large number of oxygen functional groups. Since GO is synthesized from graphite using a chemical liquid process, the cost of GO is significantly lower than other carbon nanomaterials. In this study, the application and tribological properties of GO monolayer sheets as additives in water and poly-alpha olefin (PAO) were investigated. The dependence of the friction coefficient of GO-water dispersions on GO concentration (0.01-1.0 mass %) was investigated. In particular, GO-water dispersions with a concentration of less than 0.1 mass % demonstrated low friction coefficients. In this study, GO was simply dispersed in PAO using surfactant and intermediary solvents without the need for drying treatments. We found that the use of anionic surfactants in the GO-PAO dispersions was better than cationic surfactants in terms of the degree of wear observed. Specifically, GO-PAO dispersions that used an anionic surfactant with a GO concentration of 4 mass % had the smallest wear in this study. Moreover, friction coefficients were not decreased by the addition of GO in PAO. Finally, we found that intermediary solvents did not affect lubrication.

    DOI: 10.1299/mej.15-00323

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  • Anti-wear effect of graphene oxide in lubrication by fluorine-containing ionic liquid for steel Reviewed

    Hiroshi Kinoshita, Masahiro Kondo, Yuta Nishina, Masahiro Fujii

    Tribology Online   10 ( 1 )   91 - 95   2015.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society of Tribologists  

    Although fluorine-containing ionic liquids have excellent lubricity as liquid lubricants for steels, strong tribochemical reactions leading to severe wear are occurred during friction. Recently, it is reported that graphene oxide (GO) dispersed in water and oils exhibit good anti-wear property. In this study, in order to investigate anti-wear effect of GO in lubrication of fluorine-containing ionic liquids for steel, tribological properties of mixtures of GO with concentrations of 0.2, 2, and 10 mass% and an ionic liquid [BMIM][BF4]) were investigated on a steel surface. Under the pure ionic liquid lubrication, a strong tribochemical reaction occurred, resulting in corrosion wear. Under a GO-ionic liquid mixture lubrication with 0.2 mass% GO, wear was much lower than for the pure ionic liquid lubrication. Adding GO would inhibit the strong tribochemical reaction. However, wear was high with the 10 mass% GO-ionic liquid mixture. The GO-ionic liquid mixtures did not greatly decrease the friction coefficient.

    DOI: 10.2474/trol.10.91

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  • Tribological properties of diamond nanoparticle additive in water under a lubrication between steel plate and tungsten carbide ball Reviewed

    Aidil Azli Alias, Hiroshi Kinoshita, Masahiro Fujii

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 1 )   1 - 9   2015.1

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    We studied the effectiveness of diamond nanoparticles (DNPs) dispersed in water as a lubricant additive between stainless steel plates and sintered tungsten carbide (WC) balls. DNP dispersions with concentrations of 0.01, 0.1 and 1 wt.% were prepared and used as lubricants under a load of 1.88 N, for 240,000 friction cycles. High-friction coefficients of more than 0 3 were observed in an initial period. Then friction coefficients declined and stabilised at values of approximately 0.1. The steady-state friction coefficients were independent of the DNP concentration and lower than that for distilled water. In the initial period, wear of both the plates and ball was obvious. In the steady-state period, additional wear on the plates was a little; however, ball wear scars were clearly observed. The size of the ball wear scars decreased with decreasing the DNP concentration. It is likely that DNPs were embedded mainly in the stainless steel plates, and the embedded DNPs protected the plates and wore the balls in the steady-state period. Compared with the lubrication under distilled water, the friction coefficient and wear of the plate under the lubrication by the 0.01 wt.% DNP dispersion were lower, and the wear of the ball by this lubrication condition was not higher.

    DOI: 10.1299/jamdsm.2015jamdsm0006

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  • Tribological performance of DLC coatings under water lubrication Reviewed

    Chaoqun Zhang, Masahiro Fujii

    2015 IFToMM World Congress Proceedings, IFToMM 2015   1 - 9   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:National Taiwan University  

    DLC coatings are currently used in a wide variety of industrial fields because of their outstanding properties such as high hardness, high wear resistance, low friction and so on under oil lubrication as well as no lubrication. The tribological properties were compared with six types of DLC coatings: amorphous hydrogenated DLC (a-C:H), that doped with tungsten (a-C:H:W), that doped with silicon (a-C:H:Si) and hydrogen-free DLC (ta-C). Sliding tests were conducted under water lubrication at sliding velocities of 0.02 m/s and 0.1 m/s. DLC coatings showed low friction coefficient and excellent wear resistance. Friction coefficient and wear rate decreased with increasing sliding velocity. The effect of surface wettability and mechanical properties on tribological characteristic were investigated. Friction coefficient decreased as the contact angle increased. Hydrogen-free DLC-4 with the highest hardness showed the highest friction and a larger wear. Furthermore, DLC coatings deposited with interlayer showed longer lifetimes.

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  • Influence of Wettability and Mechanical Properties on Tribological Performance of DLC Coatings under Water Lubrication Reviewed

    Chaoqun Zhang, Masahiro FUJII

    Journal of Surface Engineered Materials and Advanced Technology   5   110 - 123   2015

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  • Machine Design and Tribology Laboratory, Okayama University

    FUJII Masahiro

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   60 ( 7 )   441 - 442   2015

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    DOI: 10.18914/tribologist.60.07_441

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  • Tribological Properties of Sandfish Skink's Scale under Micro Loads

    59 ( 9 )   577 - 585   2014.9

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    DOI: 10.18914/tribologist.59.09_577

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  • Tribological property of water dispersion of single-layered graphene oxide

    木之下博, ALIAS A.A., 仁科勇太, 藤井正浩

    日本機械学会機素潤滑設計部門講演会講演論文集   14th (Web)   2014

  • Tribological Properties of Sandfish Skink's Scale under Micro Loads

    58 ( 11 )   832 - 840   2013.11

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    DOI: 10.18914/tribologist.58.11_832

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  • Special Issue on ICMDT 2011-Advances in Manufacturing, Machine Design and Tribology Preface

    Fumihiro Itoigawa, Masahiro Fujii, Toshiro Noritsugu, Yukitoshi Ohtani, Tomomi Honda

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   6 ( 1 )   1 - 1   2012

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  • Tribological Characteristics of DLC Coatings in Vacuum under Sliding Contact

    M.Ananth Kumar, Masahiro FUJII, Takuya FUKUDA

    Journal of Surface Engineered Materials and Advanced Technology   2 ( 1 )   22 - 27   2012

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  • Reducing the High Frictions on Carbon Nanotube Films by Applying Oscillating Motions under Micronewton Loads Reviewed

    H Kinoshita, M Kageyama, A A Alias, M FUJII

    Tribology Online   7 ( 4 )   213 - 217   2012

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    Under micronewton loads, the high frictions on carbon nanotube (CNT) films (with a friction coefficient of 1.7) were decreased to less than the noise level (which was roughly a friction coefficient of 0.05) by applying an oscillating motion to a cantilever on which a sliding ball was glued. This large decrease of the friction coefficient has been never observed in previous studies. The applied oscillating motion caused the twisting and bending oscillations of the cantilever, which applied the lateral and normal oscillating forces to the sliding ball. The friction force decreased with increasing the oscillating amplitudes of the twisting and bending forces, and the frequency dependences of the friction force reduction was observed.

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  • Fatigue Strength of Steel Rollers and Gears Treated by Cavitation Peening with Short Processing Time Reviewed

    Masanori Seki, Naruto Nishie, Seiya Kozai, Masamitsu Kakuda, Hitoshi Soyama, Akima Naito, Masahiro Fujii

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   6 ( 1 )   33 - 43   2012

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    In this study, steel rollers and gears were treated by the cavitation peening with processing times of 1 min and 5 min, and they were fatigue-tested using a roller testing machine and a gear testing machine. The surface hardness and the compressive residual stress of the rollers and gears were increased by the cavitation peening, while, the surface roughness of the cavitation-peened rollers and gears was almost the same as that of the non-peened ones. As a result of the fatigue tests, the fatigue strength of the test specimens were improved by the increase in surface hardness due to the cavitation peening, and those without the increase in surface hardness were not increased so much. The fatigue strength of the cavitation-peened test specimens was similar to that of the shot-peened ones obtained by the previous fatigue tests. This study revealed that the cavitation peening is expected to put to practical use in the improvement in fatigue strength of steel gears.

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  • Influence of DLC coating thickness on tribological characteristics under sliding rolling contact condition Reviewed

    Masahiro Fujii, M. Ananth Kumar, Akira Yoshida

    TRIBOLOGY INTERNATIONAL   44 ( 11 )   1289 - 1295   2011.10

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    Diamond-like-carbon (DLC) coating of thickness 3 and 10 mu M were developed with and without radical nitriding pretreatment on steel rollers and spur gear pair. The friction coefficient and wear amount were evaluated under sliding rolling contact condition in vacuum and under oil lubrication. Delamination of coatings was observed at the interface of the substrate. The wear resistance of coatings improved with the thickness of the coating. In vacuum both the roller and the gear pair of 10 mu m coating thickness with radical nitriding showed identical wear behavior. The radical nitriding seemed to enhance the life of DLC coatings. (C) 2010 Elsevier Ltd. All rights reserved.

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  • Development of Press Machine by Means of Reverse-type Differential Rotary to Linear Conversion Mechanism

    SHIMIZU Ichiro, SEKI Masanori, MATSUI Takafumi, TADA Naoya, FUJII Masahiro, YOSHIDA Akira

    Journal of Japan Society for Design Engineering   46 ( 1 )   40 - 47   2011.1

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  • Rolling Contact Fatigue Life of Steel Rollers Treated by Cavitation Peening and Shot Peening Reviewed

    Masanori Seki, Hitoshi Soyama, Yuji Kobayashi, Daisuke Gowa, Masahiro Fujii

    International Conference on Advanced Technology in Experimental Mechanics 2011(ATEM'11) Abstract Book   6 ( 11-203 )   126 - 126   2011

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    The purpose of this study is to investigate the influence of peening on the rolling contact fatigue (RCF) life of steel rollers. First, steel rollers were treated by three types of peenings to ensure the same surface roughness of peened rollers. One is the cavitation peening (CP) used a cavitating jet in water with an injection pressure of 30 MPa, and the others are the fine particle peening (FPP) with a shot diameter of 0.1 mm and the normal shot peening (NSP) with a shot diameter of 0.3 mm. The surface hardness and the surface compressive residual stress of the steel rollers were increased by all the peenings. In particular, they were most increased by the FPP. On the other hand, the work-hardened depth due to the CP and the NSP was larger than that due to the FPP. As a result of the RCF tests, the RCF lives of the steel rollers were improved by all the peenings, and they were most improved by the NSP. Judging from the pmax - N curves and the [Ay/√3 HV)]max - N curves, the improvement in RCF lives due to the FPP depended heavily on the increase in surface hardness due to that, and the effects of the CP and the NSP on the RCF were equivalent under the same surface roughness and the same surface hardness. It follows from these that the surface treatment condition should be selected according to the rolling contact conditions and the failure modes of machine elements.

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  • Rolling Contact Fatigue Life of Case-Hardened Steel Treated by Shot Peenings with Shot Diameters of 0.05 mm and 0.30 mm

    Lei Wang, Guangliang Liu, Masanori Seki, Masahiro Fujii, Qian Li

    ADVANCES IN POWER TRANSMISSION SCIENCE AND TECHNOLOGY   86   645 - +   2011

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    In order to investigate the influence of different shot peenings on the rolling contact fatigue life of case-hardened steel, the thrust type rolling contact fatigue test was performed with a ball-on-disk contact tester. In this study, the case-hardened steel disks were treated by the fine particle peening with a shot diameter of 0.05 mm and the normal shot peening with a shot diameter of 0.30 mm. The surface hardness and the surface compressive residual stress of the test disks were increased by these peenings. On the other hand, the surface roughness of the test disks was increased by the normal shot peening, and was decreased by the fine particle peening. The rolling contact fatigue test showed that the rolling contact fatigue life of the test disks was improved by the fine particle peening, and was not improved by the normal shot peening. The rolling contact fatigue life of the test disks became longer as their surface roughness became smaller. Therefore, it follows from this that the fine particle peening, which can provide the increase in surface hardness and the decrease in surface roughness, is good for the increase in the rolling contact fatigue life of case-hardened steel.

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  • Surface durability of powder-forged roller treated by shot peening Reviewed

    Masanori Seki, Masahiro Fujii, Yuji Kobayashi, Masaaki Sato, Akira Yoshida

    JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY   24 ( 1 )   141 - 144   2010.1

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    To investigate the influence of shot peening on the surface durability of powder-forged rollers, the case-hardened powder-forged rollers with a forging density of 7.5 g/cm(3) treated by the single shot peening and the double shot peening were fatigue-tested under a sliding-rolling contact condition. The surface roughness, the surface hardness and the surface compressive residual stress of the rollers were increased by the shot peening. In addition, the pores near the roller surface were deformed by the shot peening. The failure mode of all the test rollers was spalling due to subsurface cracking. The fatigue lives of all the test rollers were improved by the shot peening, and that of the test roller S08, which was shot-peened with the hardest steel shots in this experimental range, was especially improved. The surface durability of the test roller S08 was also most improved by the shot peening. Cracks became difficult to occur and propagate under the roller surface since the pores near the roller surface were deformed by the stronger shot peening. In this study, double shot peening, which generally restrains the increase in surface roughness, was not particularly effective for the improvement in the surface durability of the powder-forged rollers, because the influence of tangential force on fatigue was not always great in a case of subsurface cracking.

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  • Surface durability of WC/C-coated case-hardened steel gear Reviewed

    Masahiro Fujii, Masanori Seki, Akira Yoshida

    JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY   24 ( 1 )   103 - 106   2010.1

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    The purpose of this study is to investigate the influence of tungsten carbide/carbon (WC/C) coating on the surface durability of case-hardened steel gear. Two kinds of WC/C coatings were deposited on the ground gear pair made of chromium molybdenum steel with carburizing and quenching. One is the conventional WC/C coating, and the other is WC/C coating with about 1 mu m CrN interlayer. Here, the WC/C-coated test pinion and the WC/C-coated one with CrN interlayer are represented by WT and ST, respectively. Non-coated test pinion is represented by NT. The surface roughness along the tooth profile direction of WT and ST was almost the same as that of NT. A spur gear test was carried out with an IAE power circulating type gear test rig under EP gear oil lubricating condition. The fatal failure mode of the test pinions was pitting due to surface cracking. The fatigue life of WT was longer than that of NT under a maximum Hertzian stress p(max)=1700 MPa. On the other hand, under p(max)=1900 MPa, that of WT was as long as that of NT due to the peeling occurrence of the coated layer. Under the comparatively low load condition without peeling occurrence, the surface roughness of WT decreased with the increasing number of cycles, and their fatigue life became longer than that of NT. On the contrary, in the case of ST, the peeling of the coated layer occurred at a comparatively early stage of the gear test, and the dedendum was worn by tens of micrometers. Therefore, in the case of ST, the effect of the WC/C coating disappeared at a comparatively small number of cycles.

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  • Application of Hard Coating into Power Transmission Machine Element -Tribology under Sliding-Rolling Contact Condition-

    Masahiro Fujii

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   55 ( 5 )   329 - 334   2010

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  • An Investigation into Solidification and Mechanical Properties behavior of Al-Si Casting Alloys

    G.T.Abdel-Jaber, A.M.Omran, Khalil Abdelrazek Khalil, M.Fujii, M.Seki, A.Yoshida

    International Journal of Mechanical & Mechatronics Engineering   10 ( 4 )   34 - 41   2010

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  • Evaluation of Pitting Fatigue Life and Surface Durability Considering D-value and Hardness(Machine Elements, Design and Manufacturing)

    YOSHIDA Akira, SEKI Masanori, FUJII Masahiro, FUKUHARA Kento

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   76 ( 769 )   2325 - 2331   2010

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    In order to examine the effects of the O-value and the hardness on the pitting fatigue life and the surface durability synthetically, data from 38 series of roller tests and 2 series of gear tests which were conducted under a sliding-rolling contact condition with various lubricating oils using various specimens with different hardness of HV170 to HV540 finished by various methods are considered in this paper. It is consequently clarified that the surface durability is proportional to the hardness and this tendency is changed by the surface roughness and the D-value, the relationship between the Dvalue and the pitting fatigue life N is not absolute with some dispersion even under the same hardness condition, the D-value at endurance limit, i. e., Dlim tends to increase as the hardness and the surface roughness increase, and as to an equation of σHIIM=aDlim 385 between the Hertzian stress at endurance limit σHlim and the D lim introduced by the defined equations of the Hertzian stress and the D-value, value of a tends to decrease as the hardness and the surface roughness increase. '.

    DOI: 10.1299/kikaic.76.2325

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  • Friction, wear and surface durability of tungsten carbide/ carbon-coated gear and roller

    Masahiro Fujii, Masanori Seki, Akira Yoshida

    VDI-Berichte   623 - 634   2010

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  • Rolling Contact Fatigue Life of Cavitation-Peened Steel Gear

    Seki Masanori, Someya Hitoshi, Fujii Masahiro, Yoshida Akira

    Tribology Online   3 ( 2 )   116 - 121   2008

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    The purpose of this study is to investigate the effect of cavitation peening on the rolling contact fatigue life of steel gears. The steel rollers and gears cavitation-peened under different conditions were fatigue-tested using a roller testing machine and a gear testing machine. After the cavitation peening, the surface hardness and the surface compressive residual stress of the steel rollers and gears were increased. On the other hand, the surface roughness was not increased so much. As a result, the fatigue life of most cavitation-peened rollers and gears was longer than that of the non-peened ones. In particular, the fatigue life was significantly improved by using a modified nozzle for a high-speed water jet to obtain a greater peening effect. It is suggested from these that the cavitation peening is good for the increase in fatigue life of steel gears, because the peening effect is obtained with less increase of the surface roughness.

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  • Influence of Crowning on Rolling Contact Fatigue Strength and Failure Mode of Steel Roller

    FUJII Masahiro, BAYASGALAN Seesregdorj, YOSHIDA Akira, HAMADA Kenji, MINEGISHI Kiyoji, TAMENAGA Jun

    Transactions of the Japan Society of Mechanical Engineers C   73 ( 728 )   1222 - 1229   2007.4

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    The rolling contact fatigue of crowned rollers made of bearing steel SUJ2 was investigated with a two-roller test machine under a sliding-rolling contact condition with oil lubricant. The nominal crowning radii of the rollers were 110mm, 90mm and 60mm. The roller was mated with a non-crowned roller or a roller with a concave crowning radius of 110mm. The contact pressure and subsurface stress were analyzed with three dimensional FEM. Within the applied load in this experiment no edge loading or minor edge loading occurred in the crowned rollers mated with the non-crowned roller and major edge loading occurred in the crowned rollers mated with the concave crowned roller. In case that no edge loading or minor edge loading occurred, the failure mode of the rollers were pitting caused by surface cracking and the rolling contact fatigue strength evaluated with the normal load increased with increasing crowning radius. In case that the edge loading was great, the failure mode of the rollers tended to be spalling caused by subsurface cracking and the influence of the crowning radius on the rolling contact fatigue strength was little.

    DOI: 10.1299/kikaic.73.1222

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  • Rolling contact fatigue characteristics of newly developed bearing steel with addition of Si and Mo under quasi-high temperature Reviewed

    Hiroshi Ohsaki, Ryousuke Ano, Yuji Ohue, Masahiro Fujii, Akira Yoshida

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   52 ( 5 )   373 - 380   2007

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    In order to elucidate the rolling contact fatigue characteristics of the newly developed bearing steel SBS1 principally under the quasi-high temperature, the washer and ball specimens made of SBS1 were tested at a temperature of 403 K and also at non-controlled temperatures under a rolling contact condition using a thrust bearing type rolling fatigue testing machine. This kind of test was performed also by using the conventional bearing steel SUJ2 for the comparison. For discussing these results about the rolling contact fatigue lives of the washers, the microstructural changes of the fatigue-tested washers and balls were observed around the depth where the orthogonal shear stress and the maximum shear stress become maximum. The soaking test was also conducted at a temperature of 453 K using the balls, and the changes of the hardness and the full width at half maximum with the increase of the soaking time was examined. It could be clarified from these investigations that the rolling contact fatigue life of the newly developed bearing steel SBS1 was much longer than that of the conventional bearing steel SUJ2 especially under the quasi-high temperature.

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  • Si およびMo を添加した新軸受鋼の準高温下の転がり疲労特性 Reviewed

    大﨑浩志, 阿野亮介, 大上祐司, 藤井正浩, 吉田 彰

    トライボロジスト   52 ( 5 )   373 - 380   2007

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  • Influence of coating thickness on rolling contact fatigue of alumina ceramics thermally sprayed on steel roller

    Masahiro Fujii, Jiabin Ma, Akira Yoshida, Sadato Shigemura, Kazumi Tani

    TRIBOLOGY INTERNATIONAL   39 ( 11 )   1447 - 1453   2006.11

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    The influence of the sprayed layer thickness on rolling contact fatigue of a thermally sprayed alumina ceramics with a nominal composition of Al(2)O(3)-2.3 mass% TiO(2) was investigated using a two-roller test machine under pure rolling contact condition with oil lubricant. The influence of undercoating of sprayed nickel-based alloy on rolling contact fatigue was also investigated. Thicknesses of the ceramics-sprayed layer of tested rollers were 0.2, 0.5 and 1.0 mm. The failure mode of sprayed rollers was spalling caused by subsurface cracking. In the case of sprayed rollers without undercoating, rolling contact fatigue strength of rollers with 0.2 mm thickness sprayed layer was the smallest. Rolling contact fatigue strength of sprayed roller with 0.2 mm thickness sprayed layer was improved by undercoating. In case the failure depth was small as compared with the thickness of sprayed layer, effect of undercoating on the rolling contact fatigue strength was little. The depths where the maximum values of subsurface shear stresses occurred, almost corresponded to the observed depth of spalling cracks. (c) 2006 Elsevier Ltd. All rights reserved.

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  • Rolling Contact Fatigue Characteristics of Ball Made of Newly Developed Bearing Steel with Addition of Si and Mo Reviewed

    OHSAKI Hiroshi, ANO Ryousuke, YOSHIDA Akira, FUJII Masahiro, IWASAKI Katsuhiro

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   51 ( 9 )   652 - 659   2006.9

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    Recent rolling bearings have been used under the severe condition in many machines. For this trend, the vacuum melt to reduce the inclusion and some special heat treatments have been applied to the bearing steel for improving the rolling fatigue characteristics. While, the new development of bearing steel itself is required for the greater improvement in the fatigue characteristics. In this report, a newly developed bearing steel ball with rich amount of Si and Mo and the conventional bearing steel SUJ2 ball were fatigue-tested using a dynamic load type and a static load type rolling bearing fatigue testing machines. The rolling fatigue lives of these new and conventional steel balls were compared with each other, and were discussed considering the measured results of the hardness, residual stress, full width at half maximum and retained austenite during the fatigue process, and also of the initial carbide grain size, crush load and so on. It was consequently confirmed that the newly developed bearing steel ball has much longer rolling fatigue life comparing with the conventional one.

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  • Rolling contact fatigue of alumina ceramics sprayed on steel roller under pure rolling contact condition

    Masahiro Fujii, Akira Yoshida, Jiabin Ma, Sadato Shigemura, Kazumi Tani

    TRIBOLOGY INTERNATIONAL   39 ( 9 )   856 - 862   2006.9

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    The rolling contact fatigue of sprayed alumina ceramics with a nominal composition of Al(2)O(3)-2.3 mass% TiO(2) was studied with a two-roller test machine under a pure rolling contact condition with oil lubricant. The influence of undercoating of sprayed Ni-based alloy on the rolling contact fatigue was investigated. The failure mode of all sprayed rollers was spalling caused by subsurface cracking. The undercoating did not contribute to the improvement of the rolling contact fatigue life. The elastic modulus of the alumina sprayed layer evaluated with the nano-indentation method was around 85 GPa. The depths of the observed subsurface cracks corresponded approximately to the depths where the orthogonal shear stress or the maximum shear stress calculated with two-dimensional FEM became maximum. (c) 2005 Elsevier Ltd. All rights reserved.

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  • Influence of Sprayed Layer Thickness on Rolling Contact Fatigue of Ceramics Sprayed Roller

    FUJII Masahiro, YOSHIDA Akira, ISHIMARU Jun, SHIGEMURA Sadato, TANI Kazumi

    Transactions of the Japan Society of Mechanical Engineers C   72 ( 716 )   1354 - 1360   2006.4

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    The influence of the sprayed layer thickness on the rolling contact fatigue of a thermally sprayed alumina ceramics with a nominal composition of Al_2O_3-2.3 mass%TiO_2 was investigated using a two-roller test machine under pure rolling contact condition with oil lubricant. The influence of undercoating of sprayed nickel based alloy on the rolling contact fatigue was also investigated. The thicknesses of the ceramics sprayed layer of the test rollers were 0.2, 0.5 and 1.0mm. The failure mode of the sprayed rollers was spalling caused by subsurface cracking. In case of the sprayed rollers without undercoating, the rolling contact fatigue strength of the rollers with 0.2mm thickness sprayed layer was the smallest. The rolling contact fatigue strength of the sprayed roller with 0.2mm thickness alumina sprayed layer was improved by undercoating. In case that the failure depth was small as compared with the thickness of the sprayed layer, the effect of undercoating on the rolling contact fatigue strength was little. The depths, where the maximum values of subsurface shear stresses occurred, almost corresponded to the observed depths of spalling cracks.

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  • Application of Porous Ceramics to Aerostatic Guide : 1^<st> Report : Evaluation of Static Stiffness

    FUJII Masahiro, YOSHIDA Akira, LIU Sijian, MASADA Keiichi, NAGASHIO Hisao, YOSHIKAWA Masahiro

    Journal of Japan Society for Design Engineering   41 ( 1 )   48 - 54   2006.1

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  • Friction and Wear of Wear Resisting Stainless Steel

    FUJII Masahiro, YOSHIDA Akira, MIURA Kenzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   71 ( 704 )   1376 - 1383   2005.4

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    The friction and wear characteristics of newly developed wear resisting stainless steel, which was designed for improving friction and wear characteristics, were investigated with ring-on-disk test apparatuses under oil lubricating condition and non-lubricating condition in air and in vacuum. The friction and wear behaviors were compared with those of JIS SUS420J2 stainless steel. In case under non-lubricating condition in air and in vacuum, both friction coefficient at room temperature and wear amount of the wear resisting stainless steel were smaller than those of SUS420J2. The extent of transference of wear debris was comparatively small in case of the wear resisting stainless steel. In case under oil lubricating condition, the scuffing of the wear resisting stainless steel was hard to progress and the wear amount was also small even after scuffing occurrence. The wear resisting stainless steel had the superior anti-scuffing characteristics.

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  • Influence of crowning on rolling contact fatigue of steel rollers

    M Fujii, A Yoshida, S Bayasgalan, K Minesgishi, J Tamenaga

    International Conference on Gears, Pts 1 and 2   1904   1743 - 1748   2005

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    The rolling contact fatigue of crowned rollers made of bearing steel was investigated with a two-roller test machine under a sliding-rolling contact condition with oil lubricant. The nominal crowning radii of the rollers were 110, 90 and 60 mm. The roller was mated with a non-crowned roller or a roller with a concave crowning radius of 110 mm. In case that no edge load or minor edge load occurred, the failure mode of the rollers tended to be pitting caused by surface cracking and the rolling contact fatigue strength evaluated with the normal load increased with increasing crowning radius. In case that the edge load was great, the failure mode of the rollers tended to be spalling caused by subsurface cracking and the difference in the rolling contact fatigue strength was little.

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  • Rolling Contact Fatigue of Alumina Ceramics Sprayed Roller

    FUJII Masahiro, YOSHIDA Akira, SHIGEMURA Sadato, TANI Kazumi, YUKI Kenji

    Transactions of the Japan Society of Mechanical Engineers. Series C.   70 ( 699 )   3331 - 3338   2004

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    The rolling contact fatigue of a sprayed alumina ceramics with a nominal composition of Al_2O_3-2.3 mass%TiO_2 was studied with a two-roller test apparatus under pure rolling contact condition with oil lubricant. The alumina ceramics was prepared by plasma spray process. The influence of undercoating of sprayed Ni based alloy and surface sealing on the rolling contact fatigue was investigated. The failure mode of all sprayed rollers was spalling caused by subsurface cracking. Neither undercoating nor surface sealing contributed to the improvement of the rolling contact fatigue. The elastic modulus of the alumina sprayed layer evaluated with the nano-indentation method was around 85 GPa. The subsurface shear stresses were calculated with two-dimensional FEM analyses. The maximum values of orthogonal shear stress and maximum shear stress occurred within the spraved layer. The depths of observed subsurface cracks were generally deeper than those of the maxima of shear stresses.

    DOI: 10.1299/kikaic.70.3331

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  • Evaluation of tribological characteristics on cold forging die by press-in punch test Reviewed

    S Mishima, A Yoshida, M Fujii, M Seki

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   48 ( 2 )   143 - 151   2003

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    Investigation on friction coefficient under high pressure such as cold forging was carried out by press-in punch test. Work specimen was made of chromium-molybdenum steel SCM415, and punch specimens were made of four kinds of tool steels, and cemented carbide as a die materials. Punches were finished by #240, #800 emery papers or lapping. Four kinds of oils and a lubricant were examined about frictional characteristics. Press-in force versus press-in depth was measured by press-in punch test. Friction coefficient was tried to calculate by numerical calculus of press-in force. PVD treatments had good effect of low seizure properties. Especially, DLC treatment was free from siezure.

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  • Friction and Wear of Electroless Ni Alloy Plated Gear under Non-Lubricating Condition in High Vacuum

    FUJII Masahiro, YOSHIDA Akira, HARANO Tomoya, OHMAE Katsuyoshi

    Transactions of the Japan Society of Mechanical Engineers. Series C.   69 ( 681 )   1417 - 1424   2003

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    A gear test and a two-cylinder test were carried out under non-lubricating condition in high vacuum to investigate the friction and wear behaviors of electroless Ni based alloy plated gears in vacuum. The gear test results were compared with the two-cylinder test results. Three kinds of electroless Ni based alloy platings and two kinds of composite platings with dispersed particles were employed here. In case of the Ni-P alloy plated gear with dispersed PTEE particles, the wear was almost uniform along the tooth profile and the fluctuation of the dynamic load was small. In cases of the Ni-B alloy plating, the Ni-P-B alloy plating and the Ni-P alloy plating with dispersed BN particles, the wear of the gear pairs was large, while the wear of the cylinders was rather small. Though the wear in the two-cylinder test was much smaller than that in the gear test, the average friction coefficients in both the two tests were almost the same with each other.

    DOI: 10.1299/kikaic.69.1417

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  • Design of Spiral Bevel Gear Flank for Forging Die : 2nd Report, Die Making, Gear Forging and Tooth Flank Evaluation

    MISHIMA Susumu, YOSHIDA Akira, FUJII Masahiro, SEKI Masanori

    Journal of Japan Society for Design Engineering   38 ( 5 )   51 - 58   2003

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  • Evaluation of tribological characteristics on cold forging die by pin-on-disk test Reviewed

    S Mishima, A Yoshida, M Fujii, M Seki

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   48 ( 2 )   135 - 142   2003

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    Investigation on friction coefficient under high pressure such as cold forging was carried out by pin-on-disk test. Pin specimens were made of chromium-molybdenum steel SCM415 as work material and disk specimens were made of four kinds of high speed tool steels and cemented carbide as die materials. Nominal stresses of 1000 to 167N/mm(2) were loaded on the sliding surface of pin. The surface of the disk specimens was finished by #240, #800 emery papers or lapping. Friction coefficient of #800 polished disk showed lower value than that of mirror finished one. PVD treatments had good effect of low seizure properties. Especially, DLC treatment was free from seizure. The friction coefficient of P/M high speed tool steel H which contains appropriate dispersed carbide was lower than that of homogeneous microstructure AISI S7. This paper reports the friction coefficient relative to combination of materials, surface finish, surface treatment and load of specimens.

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  • Influence of soft surface modification on rolling contact fatigue strength of machine element

    A Yoshida, M Fujii

    TRIBOLOGY INTERNATIONAL   35 ( 12 )   837 - 847   2002.12

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    Various surface modification methods have been employed in order to improve the tribological. performance of machine elements. In this work, electroless Ni-P alloy plating and sulfurizing treatments were employed, and the surface modified steel rollers and ball bearings were fatigue-tested under a pure or free rolling contact condition. The fatigue lives of both rollers and bearings were improved by these surface modifications. The contact pressure and subsurface stresses of the surface modified rollers and bearings were analyzed. The reason why the rolling fatigue strengths of surface modified rollers and bearings were higher than those of the non-coated ones would be due to the smaller contact pressure and subsurface stresses by the smaller elasticity as well as the conformity of the plated layer. (C) 2002 Elsevier Science Ltd. All rights reserved.

    DOI: 10.1016/S0301-679X(02)00068-3

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  • Scuffing Characteristics of Wear Resisting Steel and Steel with Surface Modification Treatment Reviewed

    Kenzo Miura, Tetsuo Komoda, Takashi Kuwada, Akira Yoshida, Masahiro Fujii

    Bulletin of the Marine Engineering Society in Japan   2002

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  • Tribological performance of electroless Ni alloy plated spur gears in high vacuum

    A Yoshida, M Fujii, T Harano

    INTERNATIONAL CONFERENCE ON GEARS, VOLS 1 AND 2   1665   967 - 979   2002

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:V D I-V D E - VERLAG GMBH  

    Spur gear test was carried out under non-lubricating condition in high vacuum of the order of 10(-4) Pa at room temperature to investigate the wear and friction performances of electroless Ni alloy platings. Three kinds of electroless Ni alloy platings; electroless Ni-P alloy plating, electroless Ni-B alloy plating and electroless Ni-P-B alloy plating, and two kinds of composite platings; electroless Ni-P alloy plating with PTFE particles and electroless Ni-P alloy plating with BN particles, were employed. The influences of the composition and the dispersed self-lubricated particles in the electroless Ni alloy platings on the tribological performance were examined. In addition the gear test results were compared with the roller test results obtained under about the same maximum Hertzian pressure.

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  • 耐摩耗性鋼および表面改質処理材のスカッフィング特性

    三浦健藏, 薦田哲男, 桑田隆司, 吉田 彰, 藤井正浩

    日本マリンエンジニアリング学会誌   36 ( 4 )   31 - 37   2001

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    DOI: 10.5988/jime.36.225

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  • Machine Design and Tribology Laboratory, Okayama University Reviewed

    A Yoshida, M Fujii, M Seki, T Harano

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   44 ( 8 )   621 - 621   1999

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  • Tribology in ceramics bearings under water lubrication

    M Fujii, A Yoshida

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   42 ( 8 )   619 - 624   1997

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  • Bulk temperature rise of working tooth flanks in spur gears.

    OBATA Fumio, FUJITA Komei, FUJII Masahiro

    JSME international journal. Ser. 1, Solid mechanics, strength of materials   30 ( 260 )   337 - 343   1987

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    The bulk temperature rise was studied when a moving heat source with variational heat quantity was applied repeatedly at regular intervals to the surface of an isotropic and homogeneous rectangular shaped body used as a model of a spur gear tooth. The effect of radiation at the inner surface of a boss on the bulk temperature rise is reduced as the distance between the inner surface of the boss and the working tooth flank is increased. The bulk temperature rise is almost inversely proportional to the heat supply interval. The size of the heat supply region and the moving direction of the heat source scarcely affect the bulk temperature rise. in a |νν^-| range of not less than 1000, the bulk temperature rise is not affected by the moving velocity of the heat source, and the approximate bulk temperature rise can be obtained by dividing the temperature rise of the working tooth flank due to a stationary heat source by the number of teeth.

    DOI: 10.1299/jsme1987.30.337

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  • Scoring in spur gear pairs. Increase in scoring load capacity due to tooth profile wear on the approach side.

    OBATA Fumio, FUJITA Komei, FUJII Masahiro, MATSUDA Hiroshi, MATSUO Kohei

    JSME international journal. Ser. 1, Solid mechanics, strength of materials   30 ( 265 )   1144 - 1151   1987

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    The influence of tip interference on scoring load capacity was studied using gears having tooth profile wear due to scoring on the approach side. The results were compared with those obtained with gears having no profile wear from the viewpoints of scoring load and scoring temperature, taking the lubrication state on the working flank into consideration. The tip interference on the approach side should be reduced because, unlike on the recess side, it diminishes the scoring load capacity. In the mixed lubrication state, the working flank bulk temperature is suitable as an index for calculating the scoring load capacity of a spur gear pair. The scoring temperature on the cylinder just before seizure in two-cylinder tests, provided that the specific sliding and the sliding velocity at the end of gear meshing are taken into account.

    DOI: 10.1299/jsme1987.30.1144

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Books

  • 国際会議論文抄録集 International Gear Conference 2018

    藤井正浩( Role: Joint author)

    日本機械学会RC275歯車装置の設計・製造・評価に関する技術革新のための調査研究分科会  2019.4 

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  • 国際会議論文抄録集 International Conference on Gears

    藤井正浩( Role: Joint author)

    日本機械学会RC275歯車装置の設計・製造・評価に関する技術革新のための調査研究分科会  2018 

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  • Elucidation and Control of Tribology by Numerical Simulation and Surface Analysis

    ( Role: Joint author)

    2018  ( ISBN:9784924728806

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  • Elucidation and Control of Tribology by Numerical Simulation and Surface Analysis

    2018  ( ISBN:9784924728806

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  • 国際会議論文抄録集 International Conference on Gears 2015 & ASME2015 Power Transmission and Gearing Conference

    藤井正浩( Role: Joint author)

    日本機械学会RC268歯車装置に対する設計・製造及び評価に関する革新的技術探究の調査研究分科会  2016 

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  • 国際会議論文抄録集 International Gear Conference

    藤井正浩( Role: Joint author)

    日本機械学会RC261歯車装置の設計・製造・評価における技術の高度化に関する調査研究分科会  2015 

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  • 国際会議論文抄録集 VDI International Conference on Gears

    藤井正浩( Role: Joint author)

    日本機械学会RC261歯車装置の設計・製造・評価における技術の高度化に関する調査研究分科会  2014 

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  • 国際会議論文抄録集 11th ASME International Power Transmission and Gearing Conference

    藤井正浩( Role: Joint author)

    日本機械学会RC251次世代伝動装置のための超高強度歯車の設計,製造,および材料評価技術に関する調査研究分科会  2012 

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  • 国際会議論文抄録集 IFToMM World Congress in Mechanism and Machine Sciences 13th World Congress

    藤井正浩( Role: Joint author)

    日本機械学会RC251次世代伝動装置のための超高強度歯車の設計,製造,および材料評価技術に関する調査研究分科会  2012 

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  • 国際会議論文抄録集 2010 VDI International Conference on Gears

    藤井正浩( Role: Joint author)

    日本機械学会RC241歯車装置のさらなる高性能と高機能実現のための設計・製造技術調査研究分科会  2011 

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  • アクチュエータが未来を創る

    ( Role: Joint author)

    産業図書  2011 

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  • 機械要素設計

    吉田, 彰, 藤井, 正浩( Role: Joint author)

    日本理工出版会  2011  ( ISBN:9784890196265

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    Total pages:viii, 242p   Language:Japanese

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  • 国際会議論文抄録集 ASME Power Transmission and Gearing Conference & The 3rd International Conference on Power transmissions

    藤井正浩(他20名)( Role: Joint author)

    日本機械学会RC241歯車装置のさらなる高性能と高機能実現のための設計・製造技術調査研究分科会  2010 

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  • 国際会議論文抄録集 The JSME International Conference on Motion and Power Transmissions (MPT2009)

    *藤井正浩,他74名( Role: Sole author)

    日本機械学会RC241 歯車装置のさらなる高性能と高機能実現のための設計・製造技術調査研究分科会  2009 

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  • 国際会議論文抄録集10th ASME International Power Transmission and Gearing Conference(PTG)

    *藤井正浩,他28名

    日本機械学会RC230 歯車装置の使用範囲拡大のための設計・製造技術に関する調査研究分科会  2008 

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  • マイクロ・マクロ表面形状を考慮した伝動トライボ要素の表面強さの評価と検証

    吉田, 彰, 藤井, 正浩, 關, 正憲, 大上, 祐司

    吉田彰  2007.4 

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  • 国際会議論文抄録集 The 12th World Congress in mechanism and Machine Science (IFToMM2007)

    *藤井正浩,他15名

    日本機械学会RC230 歯車装置の使用範囲拡大のための設計・製造技術に関する調査研究分科会  2007 

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    Responsible for pages:31-34  

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  • 多孔質ファインセラミックスを用いた高剛性・高機能制圧空気ガイドの開発に関する研究

    藤井, 正浩

    藤井正浩  2006.3 

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    Total pages:1冊   Language:Japanese

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  • 微細粒子分散による表面改質皮膜の高機能化に関する研究

    藤井, 正浩

    藤井正浩  2004.3 

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    Total pages:1冊   Language:Japanese

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  • 国際会議論文抄録集MPT-2001-Fukuoka, The JSME International Conference on Motion and Power Transmissions

    *藤井正浩( Role: Joint translator ,  非線形パラメトリックモデルを用いた浸炭歯車材の表面強さに関するR-S-N曲線の構築 ほか2)

    RC-184歯車装置の次世代設計・製造技術調査研究分科会  2002 

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    Responsible for pages:35,39,102  

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  • 国際会議論文抄録集VDI International Conference on Gears

    *藤井正浩( Role: Joint translator ,  鋼性ピニオンとプラスチック製ホイールを組合わせたねじ歯車の負荷容量 ほか2)

    RC-184歯車装置の次世代設計・製造技術調査研究分科会  2002 

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    Responsible for pages:45,53,57  

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  • 高温真空環境下における高機能表面改質機械要素のトライボ性能評価

    藤井, 正浩

    藤井正浩  2001.3 

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    Total pages:28p   Language:Japanese

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MISC

  • Alumina zirconia composite coating for improving wear resistance of connecting parts in artificial hip joint

    塩田忠, 愛原蒼平, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2022   2022

  • ボロン添加液相焼結歯車の開発

    江頭繁樹, 伊志嶺朝之, 上野友之, 藤井正浩

    粉体粉末冶金協会講演大会(Web)   2021   2021

  • Friction and wear behavior of Si-based organic-inorganic hybrid films in water

    塩田忠, 山本剛史, 塩見公, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

  • Fast time-resolved measurement during fracture of alumina ceramics

    塩田忠, IM Mingyun, 大宮祐也, 藤井正浩

    日本セラミックス協会年会講演予稿集(Web)   2021   2021

  • Improvement of friction property in normal saline by silicon carbide coating

    塩田忠, 谷家大樹, 竹中優加, 石井良助, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

  • Application of Wood-Derived Nanocarbon Materials to Rubber and their Mechanical Properties

    PENG Lyuan, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

  • Effect of laser peened dimples on friction characteristics

    藤井正浩, 塩田忠, 大宮祐也, 河渕紗英子

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

  • Tribological properties in water of silica coatings on stainless steel substates

    塩見公, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

  • Influence of Surface Roughness on Behavior of Angle Control Tightening

    玄馬之善, 大竹遼平, 両角由貴夫, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   59th   2021

  • A Discussion of Micro Leakage Mechanism Based on Microscopic Observation of Metal Flat Gasket Surface

    林大雅, 大宮祐也, 塩田忠, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2021   2021

  • Influence of surface texturing on adhesive joint strength

    豊田健二, 大宮祐也, 中西亮太, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

  • Influence of tightening speed on thread damage in grease lubrication

    川口隼己, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

  • Influence of laser peening on rolling contact fatigue life of carburized and hardened steel

    影山大恩, 河渕紗英子, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

  • Leakage characteristic of pipe flange connection including dispersed axial bolt force

    ZHU Wanyu, 大宮祐也, 塩田忠, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

  • Effect of tribocharging on the occurrence of low friction state by water-lubricated sliding of silicon carbide

    XIAO Jiaxin, 塩田忠, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   58th   2020

  • Analyses on Mechanical Behaviour of the Bolted Joints in case of the tightening by 3D FEM

    両角由貴夫, 玄馬之善, 大宮祐也, 藤井正浩

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2019   2019

  • A Study on Strength Reliability of Adhesive Joints by Texturing and Surface Modification

    豊田健二, 大宮祐也, 篠永東吾, 岡田晃, 藤井正浩

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2019   2019

  • 木材由来の酸化ナノカーボンを用いたSBRゴムの補強

    河元広樹, 大宮祐也, 藤井正浩

    日本機械学会中国四国支部総会・講演会講演論文集(CD-ROM)   57th   2019

  • Deformation Analyses and Reductions of Bolt Axial Tension in the Bolted Joints with Creep of Clamped Parts

    両角由貴夫, 増田大貴, 玄馬之善, 大宮祐也, 藤井正浩

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2018   2018

  • Effect by a Plain Washer on Reduction of Bolt Axial Tension in Bolted Joints in the case of Creep Deformation of Clamped Parts

    増田大貴, 大宮祐也, 両角由貴夫, 藤井正浩, 玄馬之善

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2018   2018

  • 木材由来ナノカーボン分散水潤滑下におけるポリアセタールのトライボロジー特性

    中植大介, 大宮祐也, 藤井正浩, 木之下博

    日本設計工学会研究発表講演会講演論文集   2018   2018

  • 木材由来酸化ナノカーボン-ZnDTP複合添加潤滑油の摩擦特性に及ぼす面圧とすべり速度の影響

    西崎僚太, 大宮祐也, 藤井正浩, 木之下博

    日本設計工学会研究発表講演会講演論文集   2018   2018

  • 締結時におけるRJG付き大口径管フランジ締結体のボルト軸力挙動

    大宮祐也, 藤井正浩, 真鍋和暉, ZHU Wanyu

    日本機械学会機素潤滑設計部門講演会講演論文集   18th   2018

  • 面接触摺動下における木材由来カーボン添加グリースのトライボロジー特性

    谷家大樹, 大宮祐也, 藤井正浩, 塩田忠

    日本設計工学会研究発表講演会講演論文集   2018   2018

  • ねじ込みボルト締結体のクリープによる軸力低下(被締付物およびめねじ部材の影響)

    渡邉忠俊, 大宮祐也, 藤井正浩

    日本機械学会年次大会講演論文集(CD-ROM)   2018   2018

  • 鋼ローラのスカッフィングに及ぼす微粒子ショットピーニングの影響

    関下裕伸, 藤井正浩, 大宮祐也, 石本興史, 上田朗弘

    日本設計工学会研究発表講演会講演論文集   2018   2018

  • ボルト締結体における被締結部材の材料特性が座面陥没量に及ぼす影響

    川口隼己, 大宮祐也, 藤井正浩

    日本設計工学会研究発表講演会講演論文集   2018   2018

  • 異種材料の摩擦撹拌点接合の熱的挙動に及ぼす加圧力及び回転数の影響

    冨岡俊介, 大宮祐也, 西口勝也, 島田聡子, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • 樹脂の摩擦・摩耗に及ぼす添加した酸化ナノカーボンの形状と濃度の影響

    河元広樹, 行好祐介, 大宮祐也, 藤井正浩, 木之下博

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • ブロックオンリングおよび四球摩擦試験を用いた酸化ナノカーボンと他添加剤との併用効果の解明

    西崎僚太, 小野秀樹, 大宮祐也, 藤井正浩, 木之下博

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • 高温流体を密封した配管接合部の漏えい量変化

    石堂謙汰, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • 被締結物のクリープによるねじ締結体のボルト軸力低下

    両角由貴夫, 増田大貴, 大宮祐也, 藤井正浩

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2017   2017

  • 潤滑油における酸化ナノカーボンと他添加剤との併用効果-往復動摩擦試験での添加濃度の影響-

    杉峯健太, 中植大介, 大宮祐也, 藤井正浩, 木之下博

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • 転動疲労挙動に及ぼす潤滑油への酸化ナノカーボン分散の影響-表面粗さの変化と寿命への影響-

    竹本和樹, 菊地大樹, 大宮祐也, 藤井正浩, 神田信, 栃木弘, 木之下博

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2017   2017

  • 313 Rolling contact fatigue of steel roller with indentation marks on contact surface

    FUJII Masahiro, KUSAHIRA Keiichi

    2016 ( 54 )   "313 - 1"-"313-3"   2016.2

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  • 315 Influence of surface condition on friction and wear of silicon carbide under oil lubrication : result with surfaces pre-slid in water

    FUJII Masahiro, FUJISAKA Yu

    2016 ( 54 )   "315 - 1"-"315-3"   2016.2

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  • 306 Rolling fatigue life of carburized steel treated by laser peening

    FUJII Masahiro, ABE Shinichiro, KOBAYASHI Yuji, TSUJI Toshiya, STAN Bovid

    2016 ( 54 )   "306 - 1"-"306-3"   2016.2

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  • 表面改質による歯車の摩擦低減および表面強度の向上

    藤井正浩

    機械技術   64 ( 9 )   25 - 29   2016

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  • 面圧強度評価の試験機,試験法

    藤井正浩

    トライボロジスト   61 ( 2 )   116 - 119   2016

  • 歯車の表面熱処理・表面改質による高強度化技術

    藤井正浩

    月刊トライボロジー   30 ( 351 )   34 - 36   2016

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  • トルク法を用いた多数ボルト締結体の締付け挙動

    大宮祐也, 藤井正浩

    日本設計工学会研究発表講演会講演論文集   2016   2016

  • 温度変動における小口径管フランジ締結体のボルト軸力変化

    石堂謙汰, 大宮祐也, 藤井正浩

    日本機械学会関東支部・精密工学会山梨講演会講演論文集(CD-ROM)   2016   2016

  • 温度変化を受ける異種材ねじ締結体の変形および応力解析(多数ボルト締結体の場合)

    両角由貴夫, 大宮祐也, 藤井正浩

    日本機械学会年次大会講演論文集(CD-ROM)   2016   2016

  • GS0104-201 Sealing Performance Experiment and Stress Analysis of Metal Gaskets under High Internal Pressure

    SHIBAI Yuta, OMIYA Yuya, FUJII Masahiro

    2015   "GS0104 - 201-1"-"GS0104-201-3"   2015.11

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    In order to examine the sealing mechanism of a connection with a metal gasket, the sealing test according to JIS B2490 and FEM analysis were carried out. The dimensions of platen used in the test are according to JIS B 2490 and the metal gasket types are chosen as metal flat and ring joint gasket. The material of the gaskets was aluminum. The ring joint gasket types are chosen as octagonal and oval. The effect of internal pressure on the sealing performance of connection with the metal flat gaskets was measured. The relationship between the gasket compression stress and amount of leakage through inter faces on the metal flat gasket was obtained. And also, the relationship between compression load and amount of leakage through inter faces on the ring joint gaskets was obtained. The von Mises stress distributions on the interface on the metal gaskets were calculated using FEM. Using the results of sealing test and FEM, it was suggested that the sealing performance was improved, when the von Mises stress more than the gaskets material of the yield stress adequately. Furthermore, it was suggested experimentally that the ratio of the maximum of von Mises stress in the gaskets material of yield stress was 1.015.

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  • 509 Correlation on Scatter between Torque Coefficient and Bolt Preload in Pipe Flange Connection Tightened by Torque Method

    OMIYA Yuya, ITANO Koji, FUJII Masahiro, YOSHII Daichi

    Yamanashi district conference   2015   146 - 147   2015.10

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  • 510 Effect of Scattered Bolt Preload on Micro Leakage from Pipe Flange Connection

    OMIYA Yuya, ITANO Koji, FUJII Masahiro

    Yamanashi district conference   2015   148 - 149   2015.10

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  • 502 Effect of Engagement Length on Stress Distribution at Screw Thread in Bolted Joint

    TAMURA Naoki, OMIYA Yuya, FUJII Masahiro

    Yamanashi district conference   2015   132 - 133   2015.10

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  • 305 Effect of Surface Properties on Fatigue Life of Cavitation-Peened Steel Roller

    NAGAHASHI Yuta, SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro

    2015 ( 53 )   "305 - 1"-"305-2"   2015.2

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  • 304 Influence of artificial surface defects on rolling contact fatigue of heat-treated steel roller

    FUJII Masahiro, WATANABE Yuta

    2015 ( 53 )   "304 - 1"-"304-2"   2015.2

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  • 102 A Design Method of Tightening Torque Based on Amount of Leakage for Pipe Flange Connection Taking Account of Bolt Preload Scatter

    ITANO Koji, OMIYA Yuya, FUJII Masahiro

    2015 ( 53 )   "102 - 1"-"102-2"   2015.2

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  • 306 Friction and Wear Behavior of Sprayed Coatings under Water Lubrication

    FUJII Masahiro, MIYOSHI Katsuya, ZHANG Chaoqun

    2015 ( 53 )   "306 - 1"-"306-2"   2015.2

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  • 粉末焼結および粉末鍛造歯車の疲労強度

    關正憲, 藤井正浩

    日本設計工学会誌設計工学   50 ( 6 )   25 - 30   2015

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    50 ( 6 )   25 - 30   2015

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  • S1130106 Deformations and Stresses Analyses of the Bolted Joints with Dissimilar Materials under Temperature Change

    MOROZUMI Yukio, OMIYA Yuya, FUJII Masahiro

    The Proceedings of Mechanical Engineering Congress, Japan   2015   _S1130106 - -_S1130106-   2015

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    Recently it is important to reduce the car weight for fuel consumption improvement. One of the solutions is to exchange materials from steel to light weight materials. In this case, the bolted joints with dissimilar materials sometimes are needed. When temperature change occurs on the bolted joints, expansions of two clamped parts are different due to different coefficient of linear thermal expansion. And that causes the sliding force on the contact surface between two clamped parts. In this study, the deformations and the stress distributions under temperature change are analyzed by FEM for the bolted joints that consist of the rectangular aluminum plate, the steel plate and two bolts. Finally, comparisons in the sliding force between the simplified calculations by the spring models and FEM analyses are conducted for several dimensions of the plates.

    DOI: 10.1299/jsmemecj.2015._S1130106-

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  • 粘弾性材料の摩擦特性に及ぼすレーザーテクスチャリングの効果

    藤井正浩, 石田幹久, 大宮祐也, 石田浩規

    日本設計工学会中国支部講演論文集   ( 32 )   2015

  • ボルト締結体のねじ谷底における応力分布にボルト呼び径が及ぼす影響

    田村直樹, 大宮祐也, 藤井正浩

    日本トライボロジー学会トライボロジー会議予稿集(CD-ROM)   2015   2015

  • 高圧力作用下における金属平型ガスケットの微小漏えい量特性

    柴井裕太, 大宮祐也, 藤井正浩

    日本設計工学会中国支部講演論文集   ( 32 )   2015

  • 652 Effects of Scattered Axial Bolt Forces on Sealing Performance of Pipe Flange Connection with a Non-asbestos Gasket under Internal Pressure

    OMIYA Yuya, ITANO Koji, FUJII Masahiro

    Yamanashi district conference   2014   161 - 162   2014.10

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  • 2A1-P01 Positioning Performance of Press Machine with a Differential Rotary to Linear Conversion Mechanism(Mechanism and Control for Actuator (1))

    SEKI Masanori, OTOTAKE Yoshiki, SAKURAI Shunsuke, SHIMIZU Ichiro, FUJII Masahiro

    2014   "2A1 - P01(1)"-"2A1-P01(4)"   2014.5

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    Press machine with a differential rotary to linear conversion mechanism was manufactured in order to evaluate the positioning performance of a punch. This differential rotary to linear conversion mechanism consisted of two rotary shafts, a rotation/translation shaft, three spur gears and a connecting block. A punch was attached to the end of the rotation/ translation shaft. In the positioning accuracy test of the punch, the positioning accuracy of the press machine was equivalent to that of the feed screw mechanism with a ball screw. In the input-output characteristics test, the press machine had superior input-output characteristics compared with the feed screw mechanism. Lastly, V bending work could be done by the press machine developed in this study.

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  • Noble metal platings on carbon nanotube films and these contact electricity resistances under micro newton load

    鈴木大介, 小野祥平, 横井悠馬, 木之下博, 藤井正浩

    日本機械学会機素潤滑設計部門講演会講演論文集   14th (Web)   2014

  • 2203 Surface Durability of Spur Gear Carburized and Quenched after Grinding

    HIDE Keita, FUJII Masahiro, SEKI Masanori, MARUO Shoji, KIMURA Yukihiko, HORIMOTO Masayuki, MAKINO Taizo

    The JSME Symposium on Motion and Power Transmissions   2013   268 - 272   2013.11

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    Because of light weight and high power of transmission, carburized and quenched gears are used as power transmission gear. Surface durability of carburized and quenched gears has been related with their tooth surface properties. The influence of abnormal carburized layer on the surface durability, however, has not been clarified. In this study, tested pinions were of two types: gear carburized and quenched after grinding, and gears carburized and quenched before grinding with two different surface roughness. In case of gears with equivalent surface roughness, the surface durability of the gear with abnormal carburized layer was longer than or almost the same as those without abnormal carburized layer. This would be because the abnormal carburized layer at the edge of tooth surface was worn during the fatigue tests.

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  • 2204 Influence of Tooth Surface Form on Fatigue Strength of Case-Hardened Steel Gears

    SEKI Masanori, FUJII Masahiro, HIDE Keita

    The JSME Symposium on Motion and Power Transmissions   2013   273 - 277   2013.11

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    In order to investigate the influence of tooth surface form on fatigue strength of steel gears, the case-hardened steel gears with non-ground tooth surfaces, ground tooth surfaces and crowned ground tooth surfaces were fatigue-tested using a gear testing machine. In the fatigue tests, the surface failure of the gear with a crown radius of 300 mm started to occur in the center of the tooth surfaces, and that of the gears with non-ground and ground tooth surfaces started to occur at the edge of the tooth surfaces. The fatigue strength using Hertzian contact stress of the gear with a crown radius of 300 mm was the highest, followed by those of the gear with ground tooth surfaces, the gear with a crown radius of 600 mm and the gear with non-ground tooth surfaces. On the other hand, the fatigue strength using normal load of the gear with ground tooth surfaces was the highest, and those of the other gears were almost the same. Therefore, it was found that the fatigue strength using Hertzian contact stress of the steel gears depends heavily on a crown radius of tooth surface, and that using normal load has little influence on it in this experimental range.

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  • J111014 The Effect of Friction Reduction by Water Dispersed Graphene Oxide : Influence of Sliding Material

    Aidil Azli Alias, Nishina Yuta, Kinoshita Hiroshi, Fujii Masahiro

    Mechanical Engineering Congress, Japan   2013   "J111014 - 1"-"J111014-4"   2013.9

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    The problems of oil lubricants in waste and maintenance management are crucial for cost and environment. Water with less harmful to environment is suitable as a candidate lubricant to replace oil lubricants. However, water is lack of viscosity, which leads to high friction and severe wear between the sliding materials. Graphene Oxide (GO) is single layer graphite with oxygen functional groups and easy to be dispersed in water. In this study, the effect of friction reduction by water dispersed GO has been evaluated with different sliding materials. The friction coefficients between SUS304 substrate vs. SUS304 ball and SUS304 substrate vs. tungsten carbide (WC) ball were approximately 0.05. Severe wear was apparent on the SUS304 ball surface slid in the GO dispersion; however, only small wear was observed on the WC ball surface after friction test in the GO dispersion.

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  • J111013 Friction decrease effect of Various Materials in Water Dispersions of Nanodiamond

    Harada Hiroki, Kinoshita Hiroshi, Fujii Masahiro

    Mechanical Engineering Congress, Japan   2013   "J111013 - 1"-"J111013-4"   2013.9

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    Water lubrication, which uses water as lubricating fluid, has many advantages such as cost, environment, high thermal conductivity, and so on. However water has low lubricating property for steel materials. In this study, tribological property of nanodiamond, which is a few nanometer size diamond, as a water-based lubricant additive has been investigated between SUS304 ball -SUS304 plate and sintered tungsten carbide (WC) ball - SUS304 plate. It has found that adding nanodiamond in water can notably improve the water lubrication property such as the very low friction coefficient for the WC ball-SUS304 plate friction and low wear on the WC ball. However, friction forces and wears for the SUS304 ball-SUS304 plate was increased by adding nanodiamond.

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  • J111011 Synthesis and tribological property of high density nanodiamond-electroless nickel plating composite

    TAGUCHI Akinori, KINOSHITA Hiroshi, FUJII Masahiro

    Mechanical Engineering Congress, Japan   2013   "J111011 - 1"-"J111011-4"   2013.9

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    In this study, nanodiamond (ND)-electroless Ni plating composite coating was synthesized for high wear resistance and low friction. The ND-Ni plating composite coating was prepared from electroless Ni plating solution dispersing diamond nano particle (DNP) on S50C substrate. Heat treatment to increase hardness of electroless Ni plating was conducted in this coating. Tribological properties of the ND-Ni plating composite coating was investigated under three lubricant conditions (no lubrication, water lubrication and 1wt.% DNP dispersion). Under the DNP dispersion, the friction coefficient of ND-Ni plating composite film and Ni plating coating were lower than other conditions. Severe wears after the friction tests were observed on the ND-Ni plating composite coating under no lubrication, however only small protrusion of the composite film tested under the DNP dispersion was worn.

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  • J112033 Syntheses of carbon nanotube - plating composites and measurements of their contact resistances under micro

    YOKOI Yuma, KINOSHITA Hiroshi, FUJII Masahiro

    Mechanical Engineering Congress, Japan   2013   "J112033 - 1"-"J112033-4"   2013.9

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    Next generation wireless communication will be required to use in high frequency range (3-5 GHz), however semiconductor switch isn't having enough performance in the high frequency range. Radio Frequency-Micro Electro Mechanical Systems (RF-MEMS) switch (small mechanical switch) is recently focused for high performance in the high frequency range. There are problems of durability and adhesion on the contact materials of this device. Carbon nanotube (CNT) film has good wear resistance, very low adhesion and very low electrical resistance which are very useful to RF-MEMS switch. On the other hand, CNT film shows high electrical contact resistance. We attempted synthesis of metal plating on CNT film as reducing method of electrical contact resistance in this study. Fiber structure was observed in composite plating CNT film. Electrical resistance of the composite materials were 520.6Ωm measured by four probe method, and electrical contact resistance was about 3Ω with a load of 5mN by two probe method.

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  • S112031 Improvement in Rolling Contact Fatigue Life of Bearing Steel by Shot Peening with Shot Diameter of 0.05 mm

    HOJO Yuya, SEKI Masanori, IKEDA Takeaki, Zhang Chao Qun, YAMANISHI Toshiyuki, NISHIZAWA Seiji, FUJII Masahiro

    Mechanical Engineering Congress, Japan   2013   "S112031 - 1"-"S112031-5"   2013.9

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    In order to investigate shot peening on rolling contact fatigue lives of bearing steel, fatigue tests were performed with a thrust testing machine and a roller testing machine. The disks and rollers were treated by shot peening with a shot diameter of 0.05mm. The surface hardness and the surface compressive residual stress of the test specimens were increased by the shot peening. The rolling contact fatigue lives of the test specimens treated by the shot peening were longer than that of the non-peened test specimens. The rolling contact fatigue lives of the disk specimens were improved by the increase in surface hardness due to the shot peening.

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  • 409 Effect of Surface Property on Pitting Strength of Case-Hardened Steel Gears

    SEKI Masanori, MARUO Shoji, HIDE Keita, KIMURA Yukihiko, HORIMOTO Masayuki, MAKINO Taizo, FUJII Masahiro

    2013 ( 51 )   "409 - 1"-"409-2"   2013.2

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  • 414 Wear Life of Solid Lubricant under High Temperature up to 873K

    Fujii Masahiro, Sasaki Tomoaki

    2013 ( 51 )   "414 - 1"-"414-2"   2013.2

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  • 416 Tribological Evaluation of Hard Coatings under Water Lubrication

    FUJII Masahiro, ZHANG Chaoqun, KATAOKA Atsuyuki

    2013 ( 51 )   "416 - 1"-"416-2"   2013.2

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  • 405 Rolling Fatigue Behavior of Steel Roller with Surface Defects

    FUJII Masahiro, HOJO Ryuta

    2013 ( 51 )   "405 - 1"-"405-2"   2013.2

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  • 506 Friction reducing method on carbon nanotube films by normal oscillation : Load dependence under micro newton loads

    KAGEYAMA Masatoshi, KINOSHITA Hiroshi, YOKOI Yuma, FUJII Masahiro

    2013 ( 51 )   "506 - 1"-"506-2"   2013.2

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  • 504 Investigations of Micro Tribological Mechanisms in Biological Scales for Biomimetics

    MASAYASU Ryosuke, KINOSHITA Hiroshi, FUJII Masahiro

    2013 ( 51 )   "504 - 1"-"504-2"   2013.2

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  • 415 Effects of Surface Feature on Friction Characteristic of Viscoelastic Material

    FUJII Masahiro, YOKOYAMA Takehisa, KUNITOMI Yuta, ISHIDA Koki

    2013 ( 51 )   "415 - 1"-"415-2"   2013.2

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  • 505 Development of Electroless Nickel Plating Composition Film including Carbon Based Materials

    OHSHIMA Takashi, TAGUCHI Akinori, KINOSHITA Hiroshi, FUJII Masahiro

    2013 ( 51 )   "505 - 1"-"505-2"   2013.2

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  • 404 Surface Property Changes during Fatigue Process of Peened Case-Hardened Steel Rollers

    SEKI Masanori, ICHIHARA Taishi, NAGAHASHI Yuta, SOYAMA Hitoshi, KOBAYASHI Yuji, GOWA Daisuke, FUJII Masahiro

    The Proceedings of Conference of Chugoku-Shikoku Branch   2013 ( 51 )   _404 - 1_-_404-2_   2013

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    DOI: 10.1299/jsmecs.2013.51._404-1_

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  • S111035 Elasto-plastic Analysis of Foreign Object Damage on Contact Surface

    FUJII Masahiro, INUI Ryoma

    Mechanical Engineering Congress, Japan   2012   "S111035 - 1"-"S111035-4"   2012.9

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    Foreign object damage is attributed to dents formed by foreign objects such as debris and wear particles. It is important to clarify the behaviors of dent formation and stresses on contact surfaces in order to investigate the influence of foreign object damage on surface durability. Plastic deformation and formation of crown shape dent on contact surface were analyzed with elasto-plastic FEM analysis. A semispherical foreign object with a diameter of lOOμm was pressed against an elastic-perfectly plastic solid surface with a yield stress of 800 MPa or 1600 MPa Dent formation, crown height, contact pressure, and subsurface stress calculated with rigid foreign object were compared with those with elastic-perfectly plastic one.

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  • 2305 Fundamental Study of Tribologied Property of Carbon Nanotube Film under Millinewton Loads

    Ohshima Takashi, Toda Kosuke, Kinoshita Hiroshi, Fujii Masahiro

    The Machine Design and Tribology Division meeting in JSME   2012 ( 12 )   169 - 170   2012.4

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  • 504 Relation between Work Hardening and Fatigue Life of Steel Gear Treated by Cavitation Peening

    SEKI Masanori, KAKUDA Masamitsu, SOYAMA Hitoshi, NAITO Akima, FUJII Masahiro

    2012 ( 50 )   50401 - 50402   2012.2

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  • 514 Friction and Wear Behavior of DLC Coating Deposited with Plasma CVD under Non-Lubricating Condition in Vacuum

    FUJII Masahiro, FUKUDA Takuya, M. Ananth Kumar, KANAYAMA Shose

    2012 ( 50 )   51401 - 51402   2012.2

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  • 506 Fatigue Life of Case-Hardened Steel Gear with Crowned Tooth Surface

    SEKI Masanori, NODA Daisuke, NISHIOKA Shingo, FUJII Masahiro

    2012 ( 50 )   50601 - 50602   2012.2

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  • 513 Friction and Wear Behavior of DLC films under Water Lubrication

    FUJII Masahiro, FUJIWARA Daisuke, ITANO Koji

    2012 ( 50 )   51301 - 51302   2012.2

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  • 516 Heavy Load Positioning by Differential Rotary to Linear Conversion Mechanism

    SEKI Masanori, OTOTAKE Yoshiki, MATSUZAKI Atsushi, SHIMIZU Ichiro, FUJII Masahiro

    2012 ( 50 )   51601 - 51602   2012.2

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  • Fatigue Strength of Steel Gears Treated by Peenings

    SEKI Masanori, FUJII Masahiro

    47 ( 1 )   22 - 27   2012.1

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  • 2101 Influence of Density on Fatigue Strength of Sintered and Powder-Forged Gears

    SEKI Masanori, FUJII Masahiro, YOSHIDA Akira

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2012 ( 12 )   103 - 106   2012

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    In this study, sintered and powder-forged rollers and gears with different densities and nickel contents were fatigue-tested using a roller testing machine and a gear testing machine in order to elucidate their fatigue strength. These experimental results were compared with the results of conventional steel ones. The hardness near the surface of the test specimens with higher nickel content was smaller than that of the other ones. The pores in the sintered rollers became smaller and were disappeared by the hot forging. The fatigue strength of the sintered rollers and gears was the lowest in this experimental range. The fatigue strength of the powder-forged rollers and gears was slightly lower than that of the steel ones. The fatigue strength of the test specimens increased as their density increased, and was hardly influenced by the nickel content in this experimental range. It was clear that the fatigue strength of the sintered and the powder-forged rollers and gears was proportional to the hardness for each pre-alloyed metal powder.

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  • 2P1-E06 Positioning Accuracy and Position Keeping Performance under Heavy Load by Differential Rotary to Linear Conversion Mechanism(Mechanism and Control for Actuator(3))

    SEKI Masanori, OTOTAKE Yoshiki, MATSUI Takafumi, SHIMIZU Ichiro, FUJII Masahiro

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)   2012   _2P1 - E06_1-_2P1-E06_4   2012

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    Test model with three precision ball screws and three spur gears was manufactured in order to evaluate the positioning accuracy and the position keeping performance under heavy load by differential rotary to linear conversion mechanism. In the positioning accuracy test under a load of 515 N, the positioning accuracy of the test model was higher than that of the feed screw mechanism. In the position keeping performance test under a load of 515 N, it was confirmed that the test model had a position keeping performance for 600 s. These results revealed that the differential rotary to linear conversion mechanism had the positioning accuracy and the position keeping performance under heavy load.

    DOI: 10.1299/jsmermd.2012._2P1-E06_1

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  • S112021 Effect of Cavitation Peening and Shot Peening on Fatigue Life of Case-Hardened Steel Rollers in a Case of Same Surface Roughness

    SEKI Masanori, SOYAMA Hitoshi, KOBAYASHI Yuji, GOWA Daisuke, FUJII Masahiro

    The Proceedings of Mechanical Engineering Congress, Japan   2012   _S112021 - 1-_S112021-3   2012

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    The purpose of this study is to investigate the effect of peening on the fatigue life of steel rollers. First, steel rollers were treated by three types of peenings to ensure the same surface roughness of peened rollers. One is the cavitation peening (CP) used a cavitating jet in water with an injection pressure of 30 MPa, and the others are the fine particle peening (FPP) with a shot diameter of 0.1 mm and the normal shot peening (NSP) with a shot diameter of 0.3 mm. The surface hardness and the surface compressive residual stress of the steel rollers were increased by all the peenings In particular, they were most increased by the FPP While, the work-hardened depth due to the CP and the NSP was larger than that due to the FPP. As a result of the roller tests, the fatigue lives of the steel rollers were improved by all the peenings, and they were most improved by the NSP. Judging from the P<max>-N curves and the [A(σ_y/Hv)]_<max>-N curves, the improvement m fatigue lives due to the FPP depended heavily on the increase in surface hardness due to that, and the effects of the CP and the NSP on the rolling contact fatigue were equivalent under the same surface roughness and the same surface hardness.

    DOI: 10.1299/jsmemecj.2012._S112021-1

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  • 811 Pitting Strength of Ground Steel Gears with Different Surface Roughness

    SEKI Masanori, FUJII Masahiro, HORIMOTO Masayuki, KAMOTO Jun, KIMURA Yukihiko, MAKINO Taizo

    2011 ( 49 )   225 - 226   2011.2

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  • 802 Evaluation of Friction Characteristic of NBR under Oil Lubrication

    FUJII Masahiro, Yoshii Yuki

    2011 ( 49 )   207 - 208   2011.2

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  • 817 Relationship betWeen Topographic FeatUres and Tribological Characteristics of Peened Steel Surface

    SEKI Masanori, NITA Seiichiro, SUGANO Shinji, FUJII Masahiro

    2011 ( 49 )   237 - 238   2011.2

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  • 810 Influence of Different Shot Peenings on Rollilg Fatigue Life of Case-Hardened Steel

    SEKI Masanori, WANG Lei, KOBAYASHI Yuji, GOWA Daisuke, FUJII Masahiro

    2011 ( 49 )   223 - 224   2011.2

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  • 801 Influence of Extreme Pressure Additives on Rolling Fatigue Strength,Friction Coefficient and Surface Roughness of Steel Roller

    FUJII Masahiro, MATSUMOTO Takeshi, MANABE Yoshitaka, SAEKI Shin

    2011 ( 49 )   205 - 206   2011.2

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  • 818 Fatigue Life of Case-Hardened Steel Roller Treated by Fine Particle Peening

    SEKI Masanori, KOBAYASHI Yuji, GOWA Daisuke, NAGAI Yasuharu, FUJII Masahiro

    2011 ( 49 )   239 - 240   2011.2

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  • 812 Fatigue Life of Cavitation-Peened Steel Roller(Comparison with Shot-Peened Steel Roller)

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, KOZAI Seiya, NAITO Akima

    2011 ( 49 )   227 - 228   2011.2

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  • 機械工学年鑑(14 機素潤滑設計,14.2 機械要素,14.2.1 伝動要素)

    藤井正浩

    日本機械学会誌   114 ( 1113 )   52 - 54   2011

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  • Rolling Contact Fatigue of Thermal Refining Steel Roller with a Hardness of HV 285-380

    Masahiro Fujii, Yasunobu Miwa, Masafumi Aoba, Noritada Fujimura, Kenzo Miura

    Proceedings of The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)   5 - 6   2011

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  • Performance Comparison of Differential Rotary to Linear Conversion Mechanisms with Multiple Ball Screws and Gears

    Yoshiki Ototake, Masanori Seki, Ichiro Shimizu, Takafumi Matsui, Masahiro Fujii

    Proceedings of The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)   165 - 166   2011

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  • Effect of Coating Thickness and Environment on The Tribology of Thick DLC Coating under Sliding Contact

    M. Ananth Kumar, Masahiro Fujii

    Proceedings of International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)   2011

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  • Performance Comparison of Differential Rotary to Linear Conversion Mechanisms with Multiple Ball Screws and Gears

    Yoshiki Ototake, Masanori Seki, Ichiro Shimizu, Takafumi Matsui, Masahiro Fujii

    Proceedings of The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)   165 - 166   2011

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  • Fatigue Strength of Steel Rollers and Gears Treated by Cavitation Peening with Short Processing Time (A Case of Processing Time of 1 minute and 5 minutes)

    Masanori Seki, Naruto Nishie, Seiya Kozai, Masamitsu Kakuda, Hitoshi Soyama, Akima Naito, Masahiro Fujii

    Proceedings of The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)   7 - 8   2011

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  • Effect of Coating Thickness and Environment on The Tribology of Thick DLC Coating under Sliding Contact

    M. Ananth Kumar, Masahiro Fujii

    Proceedings of International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)   2011

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  • Rolling Contact Fatigue of Thermal Refining Steel Roller with a Hardness of HV 285-380

    Masahiro Fujii, Yasunobu Miwa, Masafumi Aoba, Noritada Fujimura, Kenzo Miura

    Proceedings of The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)   5 - 6   2011

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  • Low Temperature Formation Process and Low Load Electrical Contact of a Carbon Nanotube Film Bonded to a Au Film Reviewed

    Hiroshi Kinoshita, Naganori Koda, Masanori Seki, Masahiro Fujii, Yoshitada Isono, Nobuo Ohmae

    Proceedings of International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)   2011

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  • Rolling Contact Fatigue Evaluation of Shot-Peened Case-Hardened Steel with a Thrust Washer Testing Machine and a Roller Testing Machine Reviewed

    Proceedings of International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)   2011

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  • 816 Fundamental Performance Comparison of Differential Rotary to Linear ConversionMechanisms with Multiple Ball Screws and Gears

    SEKI Masanori, MATSUI Takafumi, FUJII Masahiro, SHIMIZU Ichiro, OTOTAKE Yoshiki

    The Proceedings of Conference of Chugoku-Shikoku Branch   2011 ( 49 )   235 - 236   2011

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    DOI: 10.1299/jsmecs.2011.49.235

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  • 2A2-J11 Positioning Accuracy and Input-Output Characteristics of Differential Rotary to Linear Conversion Mechanism(Mechanism and Control for Actuator)

    SEKI Masanori, SHIMIZU Ichiro, MATSUI Takafumi, OTOTAKE Yoshiki, FUJII Masahiro

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)   2011   _2A2 - J11_1-_2A2-J11_4   2011

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    Differential rotary to linear conversion mechanism with three precision ball screws and three spur gears were designed in order to evaluate the positioning accuracy and the input-output characteristics under the applied output load. In the positioning accuracy test, the positioning accuracy of this mechanism was almost equivalent to the accuracy of the precision ball screw employed in the test model. In the input torque-output load conversion test, the output load per unit input torque of this mechanism was larger than that of the feed screw mechanism. These results revealed that the differential rotary to linear conversion mechanism with three precision ball screws and three spur gears has the characteristics of both high positioning accuracy and excellent input-output conversion efficiency.

    DOI: 10.1299/jsmermd.2011._2A2-J11_1

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  • 513 Rolling Contact Fatigue of Roller Made of Heat Treated Chrome Molybdenum Steel

    FUJII Masahiro, NAKAO Koji, AOBA Masafumi, FUJIMURA Noritada, MIURA Kenzo

    2010 ( 48 )   153 - 154   2010.2

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  • Fundamental Characteristics of Reverse-Type Differential Rotary to Linear Conversion Mechanism

    Masanori SEKI, Ichiro SHIMIZU, Masahiro FUJII

    Proceedings of The 2nd International Conference on Design Engineering and Science (ICDES2010)   175 - 179   2010

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  • Friction and Wear of Plasma CVD Diamond-Like Carbon Coating Deposited on Gear and Roller

    Masahiro Fujii, Akira Yoshida

    The First International Conference of Energy Engineering ICEE-1   90 - 97   2010

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  • 動力伝達機械要素への硬質被膜の適用 ―滑り転がり接触下におけるトライボロジー―

    藤井正浩

    トライボロジスト   55 ( 5 )   329 - 334   2010

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  • A study of tribological characteristics of plasma CVD DLC coatings in sliding contact under oil lubrication

    M.Ananth Kumar, Masahiro Fujii, Seiichiro Nita

    ASIATRIB2010 Extende abstracts on USB Memory   2010

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  • 機械工学年鑑(14 機素潤滑設計,14.2 機械要素,14.2.1 伝動要素)

    藤井正浩

    日本機械学会誌   113 ( 1101 )   54 - 56   2010

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  • Influence of Substrate Roughness and Thickness of DLC Coating on Tribological Behaviour in Vacuum under Sliding Contact

    M.Ananth Kumar, Masahiro Fujii, Koichi Murata, Takuya Fukuda

    Proceedings of The 2nd International Conference on Design Engineering and Science (ICDES2010)   192 - 196   2010

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  • 2306 Surface durability of thermal refined steel roller with a hardness around HV350

    FUJII Masahiro, AOBA Masafumi, FUJIMURA Noritada, MIURA Kenzo

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2010 ( 10 )   205 - 206   2010

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    The rolling contact fatigue test was conducted with thermal refined SCM and SNCM rollers with a hardness around HV350. The failure mode of all rollers was pitting caused by surface cracking. The surface hardness of rollers after test was increased by work hardening. The rolling contact fatigue strength increased with increasing surface hardness after test. The plastic deformation at the contact edge was discussed with the misaligned roller test. The strength of misaligned roller was the lower. The portion where the pitting failure occurred was not at the contact edge but toward the center of contact width. The plastic deformation at the contact edge could occurred at rather early stage of the test.

    DOI: 10.1299/jsmemdt.2010.10.205

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  • S1101-1-3 Fundamental Characterization of New Differential Rotary to Linear Conversion Mechanism Mainly Composed of Ball Screws and Gears

    SEKI Masanori, SHIMIZU Ichiro, FUJII Masahiro, MATSUI Takafumi

    The proceedings of the JSME annual meeting   2010   175 - 176   2010

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    Rotary to linear conversion is one of important mechanisms and has been widely used in various mechanical systems. We designed a new mechanism for rotary to linear conversion, which can provide linear output mechanically by using both screws and gears, and will be adequate for the both accurate positioning and high capacity. In this study, the compact mechanism designed for retrofit into mechanical devices was manufactured in order to investigate its fundamental performance. In the positioning accuracy test, the positioning accuracy of this mechanism was superior to that of a feed screw employed a precision ball screw. In the load output test, the load output of this mechanism was larger than that of a precision ball screw under some input torque condition.

    DOI: 10.1299/jsmemecjo.2010.4.0_175

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  • 512 Relationship between Improvement in Fatigue Life of Steel Gear and Increase in Hardness due to Cavitation Peening

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, NISHIE Naruto, KAKUDA Masamitsu, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2010 ( 48 )   151 - 152   2010

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    DOI: 10.1299/jsmecs.2010.48.151

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  • 511 Influence of Hard Coating Thickness on Tribological Characteristics under Oil Lubrication

    FUJII Masahiro, SEKI Masanori, NITA Seiichiro, FUKAI Joji, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2010 ( 48 )   149 - 150   2010

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    DOI: 10.1299/jsmecs.2010.48.149

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  • 514 Influence of Coating Thickness on Flaking Life of DLC Coating

    FUJII Masahiro, MURATA Koichi, FUKAI Joji, SHIRAKAWA Takahito, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2010 ( 48 )   155 - 156   2010

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    DOI: 10.1299/jsmecs.2010.48.155

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  • 520 Improvement in Sliding Property of Steel by Cavitation Peening

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, YOSHIDA Akira

    59   377 - 378   2010

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  • Machine Design and Tribology Laboratory

    FUJII Masahiro

    44 ( 12 )   666 - 666   2009.12

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  • D値と硬さを考慮したピッチング寿命と面圧強さの評価

    吉田 彰, 関 正憲, 藤井 正浩, 福原 健人

    社団法人日本設計工学会研究発表講演会講演論文集   2009 ( 2 )   31 - 34   2009.10

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  • 高出力と高精度位置決めを両立させる機械式リニアアクチュエータの開発

    松井 崇史, 關 正憲, 清水 一郎, 藤井 正浩, 吉田 彰

    社団法人日本設計工学会研究発表講演会講演論文集   2009 ( 2 )   1 - 4   2009.10

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  • ピーニングされた表面の摩擦・摩耗特性(S45C焼入れ材の場合)

    二田 誠一郎, 藤井 正浩, 關 正憲, 祖山 均, 小林 祐次, 吉田 彰

    社団法人日本設計工学会研究発表講演会講演論文集   2009 ( 2 )   51 - 54   2009.10

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  • Effect of Cavitation Peening on Tribological Characteristics of Carbon Steel

    Masanori Seki, Masahiro Fujii, Hitoshi Soyama, Akira Yoshida

    Proceedings of World Tribology Congress 2009   694   2009

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  • Influence of Base Oil Viscosity, Viscosity Index Improver, and Additives of Lubricating Oil on Rolling Contact Fatigue Strength of Steel Roller

    Masahiro Fujii, Yoshitaka Manabe, Shin Saeki, Akira Yoshida

    Proceedings of The JSME International Conference on Motion and Power Transmissions (MPT2009)   524 - 528   2009

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  • Influence of Thickness of DLC Coating on Tribological Characteristics under Sliding-Rolling Contact Condition

    Masahiro Fujii, M.Ananth Kumar, Akira Yoshida

    Proceedings of World Tribology Congress 2009   682   2009

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  • Influence of Automotive Gear Oil on Rolling Fatigue Strength of Steel Roller

    Yoshitaka Manabe, Shin Saeki, Masahiro Fujii, Akira Yoshida

    Proceedings of World Tribology Congress 2009   573   2009

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  • 908 Surface Properties and Pitting Strength of Cavitation-Peened Steel Roller

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, FUJII Isao, KAYAMA Hayato, NISHIZAWA Kazuto, SEKINE Yuichi, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2009 ( 47 )   303 - 304   2009

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    DOI: 10.1299/jsmecs.2009.47.303

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  • S1105-2-1 Evaluation of Friction of WC/C Coating Deposited on Carburized Steel by Scratch Test

    FUJII Masahiro, SEKI Masanori, YOSHIDA Akira

    The proceedings of the JSME annual meeting   2009   173 - 174   2009

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    Two kinds of WC/C coatings were deposited on the polished surface made of chromium molybdenum steel with carburizing and quenching. One is conventional WC/C coating and the other is WC/C coating with about 1μm CrN interlayer. The WC/C coatings were scratch-tested, and friction coefficient, critical load, and peeling behavior were evaluated. The friction coefficient of WC/C coatings were about a half of that of non-coated specimen. The critical load of WC/C coatings was independent on the CrN interlayer. Although the failure of substrate was negligible in the WC/C coated specimen without the interlayer, that was comparatively large in the WC/C coated specimen with the CrN interlayer. The amplitude of AE signal was large in the WC/C coated specimen with the CrN interlayer. While the CrN interlayer would improve the adhesion between the WC/C coating and the substrate, the large adhesion would negatively affect to the wear of the substrate ; the substrate was simultaneously removed with the peeling of the WC/C coating

    DOI: 10.1299/jsmemecjo.2009.4.0_173

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  • 918 Pitting Strength of WC/C Coated Case-Hardened Steel Gear

    SEKI Masanori, FUJII Masahiro, YASUDA Muru, YAMAGUCHI Hiroyuki, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2009 ( 47 )   323 - 324   2009

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    DOI: 10.1299/jsmecs.2009.47.323

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  • Special Issue on Who&apos;s Who in Tribology 2009

    M. Fujii, M. Seki

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   54 ( 12 )   834 - 834   2009

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  • 究極の無潤滑伝動トライボ機械要素実現のためのナノトライボロジー適用技術の開発

    藤井 正浩

    山陽放送学術文化財団リポ-ト   ( 52 )   22 - 26   2008.10

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  • Effect of Cavitation Shotless Peening on Fatigue Strength of Steel Gear

    Masanori Seki, Hitoshi Soyama, Masahiro Fujii, Akira Yoshida

    Conference Proceedings of the 10th International Conference on Shot Peening   99 - 104   2008

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  • Static characteristics of aerostatic guide made of partially porous ceramics

    M. Fujii, A. Yoshida, S. Liu, H. Nagashio, M. Yoshikawa

    Australian Journal of Mechanical Engineering   6 ( 1 )   37 - 44   2008

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    While both friction and wear are small in an aerostatic guide whose bearing surfaces are separated by an air film, the stiffness is rather small. Porous materials are frequently used as a restrictor to improve stiffness in an aerostatic guide. In this study a partially porous ceramics, whose boundary between the porous part and the fine part was seamless and of which the porosity and the pore size were able to be controlled flexibly, was applied to the aerostatic guide. The fundamental static characteristics of the aerostatic guide made of the partially porous ceramics were, evaluated. In addition, electroless plating was posited onto the porous ceramics surface for the purpose of obtaining high static stiffness, and the effect of plating on the static stiffness was examined. The influence of deflection of porous ceramics on static characteristics of aerostatic guide was also evaluated. The minimum clearance at the maximum dimensionless static stiffness varied little with the deflection of porous ceramics. The maximum dimensionless static stiffness was decreased by the deflection of the porous ceramics. The maximum dimensionless static stiffness could be evaluated with the ratio of the deflection to the apparent clearance. Even in the case of the non-plated ceramics, the maximum dimensionless static stiffness was around 0.4. In the case of the plated ceramics, the flow rate decreased by 1/10 or less and the clearance decreased by approximately 1/3. Consequently, high stiffness was obtained by the plating. The partially porous ceramics employed in this study would be able to be applied to aerostatic guides. © Institution of Engineers Australia, 2008.

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  • 920 Influence of Coating Thickness on Friction and Wear of DLC Coating under Oil Lubrication

    FUJII Masahiro, FUKAI Joji, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2008 ( 46 )   361 - 362   2008

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    DOI: 10.1299/jsmecs.2008.46.361

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  • 919 Effect of Cavitation Peening on Fatigue Life of Steel Roller

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, MISHIMA Takahiro, FUJII Isao, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2008 ( 46 )   359 - 360   2008

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    DOI: 10.1299/jsmecs.2008.46.359

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  • 907 An analysis for evaluation of friction and wear of DLC coating

    FUJII Masahiro, SHIRAKAWA Takahito, Ahmadi Samrand Rash, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2008 ( 46 )   337 - 338   2008

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    DOI: 10.1299/jsmecs.2008.46.337

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  • 1214 Surface Durability of Shot-Peened Sintered Powder Metal Roller

    SEKI Masanori, FUJII Masahiro, SATO Masaaki, KOBAYASHI Yuji, YOSHINAGA Katsuhito, YOSHIDA Akira

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2008 ( 8 )   93 - 96   2008

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    The purpose of this study is to investigate the influence of shot peening on the surface durability of sintered powder metal rollers. The test rollers employed in this study were made of the sintered material with a density of 7.01g/cm^3. The test rollers were shot-peened under different conditions. The surface roughness and the compressive residual stress of all the rollers were increased by the shot peening. On the other hand, the surface hardness was not increased. The rolling contact fatigue test of the rollers was performed under a sliding-rolling contact condition using a roller testing machine. The failure mode of the test rollers was spalling due to subsurface cracking. A crack occurred at a pore below the roller surface. Judging from the p_<max>-N curves, the surface durability of the shot-peeened rollers was smaller than that of the non-peened roller.

    DOI: 10.1299/jsmemdt.2008.8.93

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  • 918 Evaluation of Rolling Fatigue Strength under Lubricating Oil with Different Viscosity Characteristics

    FUJII Masahiro, SAIKI Takuya, MANABE Yoshitaka, SAEKI Shin, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2008 ( 46 )   357 - 358   2008

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    DOI: 10.1299/jsmecs.2008.46.357

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  • 915 Effect of Cavitation Peening on Fatigue Life of Steel Gear

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, TONOGOCHI Tetsuya, TOBITA Yoshiki, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2008 ( 46 )   351 - 352   2008

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    DOI: 10.1299/jsmecs.2008.46.351

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  • B13 Influence of Peening on Sliding Performance of Steel

    FUJII Masahiro, SEKI Masanori, ZHOU Danhua, NITA Seiichiro

    The Proceedings of Conference of Kyushu Branch   2008   71 - 72   2008

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    DOI: 10.1299/jsmekyushu.2008.71

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  • B03 Increase in Fatigue Life of Case-Hardened Steel Gear by Cavitating Jets in Water and Air

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, TOBITA Yoshiki, NISHIE Naruto, NISHIZAWA Kazuto, YOSHIDA Akira

    The Proceedings of Conference of Kyushu Branch   2008   51 - 52   2008

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    DOI: 10.1299/jsmekyushu.2008.51

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  • 1213 Surface Durability of Cavitation-Peened Steel Gear

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, TOBITA Yoshiki, NISHIE Naruto, YOSHIDA Akira

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2008 ( 8 )   89 - 92   2008

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    In order to investigate the effect of cavitation peening on surface durability of steel gears, the case-hardened steel rollers and gears cavitation-peened under different conditions were fatigue-tested using a roller testing machine and a gear testing machine. The hardness and the compressive residual stress of the test rollers and gears were increased by the cavitation peening. On the other hand, their surface roughness was not increased so much. In the roller tests, the fatigue life of all the cavitation-peened rollers was longer than that of the non-peened roller. In the gear tests, the surface durability of the test pinions was improved by the cavitation peening. Judging from the relationships between the maximum stress amplitude and the surface roughness, it was clear that the surface durability of steel gears was improved by the increase in surface hardness due to the cavitation peening with little influence of surface roughness.

    DOI: 10.1299/jsmemdt.2008.8.89

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  • 616 Application of Cavitation Peening to Improvement in Fatigue Life of Steel Gear

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, YOSHIDA Akira

    57   165 - 166   2008

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  • An Investigation into Solidification and Mechanical Properties Behaviorof AL-Si Casting Alloy

    G.T.Abdel-Jaber, A.M.Omran, Khalil Abdelrazek Khalil, M.Fujii, M.Seki, A.Yoshida

    Proceedings of Asian Foundry Congress 2007   CD-ROM ( E05 )   1 - 8   2007

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  • A Comparison of Rolling Contact Fatigue of Steel Roller under Traction Oil Lubrication and under Turbine Oil lubrication

    Masahiro FUJII, Akira YOSHIDA, Yasuhide MIZUNO, Kento FUKUHARA, Kiyoji MINEGISHI

    JSME-KSME Joint International Conference on Manufacturing, Machine Design and Tribology   CD-ROM   1 - 8   2007

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  • 104 Surface Durability of Single Shot-peened and Double Shot-peened Steel Rollers

    SEKI Masanori, KOBAYASHI Yuji, FUJII Masahiro, FUJITA Koji, YOSHIDA Akira

    The Proceedings of the Symposium on Motion and Power Transmission   2007   35 - 38   2007

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    In order to investigate the influence of shot peening on the surface durability of steel rollers, the steel ones treated by single and double shot peenings were fatigue-tested using two cylinders testing machine under a sliding-rolling contact condition. The hardness and the compressive residual stress of the test rollers were increased by shot peening. Their surface roughnesses were also increased by shot peening, and the surface roughness of the double shot-peened rollers was smaller than that of the single shot-peened ones. The cause of failure of all the test rollers was the spalling due to the subsurface cracking. The surface durability of the shot-peened rollers was larger than that of the non-peened roller. In particular, that of the double shot-peened rollers was the largest in this study.

    DOI: 10.1299/jsmempt.2007.35

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  • 106 Influence of Artificial Defect on Rolling Contact Fatigue Strength of Steel Roller

    FUJII Masahiro, MIZUNO Yasuhide, YOSIDA Akira

    The Proceedings of the Symposium on Motion and Power Transmission   2007   43 - 46   2007

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    In order to evaluate the influence of artificial defects (holes) on rolling contact fatigue strength of steel rollers, the steel rollers with artificial defects were contact fatigue-tested under a sliding-rolling contact condition. The crack propagation behavior was investigated. The rolling contact fatigue strength of rollers with artificial defects was smaller than those of rollers with non-artificial defect. In the case of rollers with artificial defects, cracks occurred in the vicinity of holes. The initial crack propagated from the hole was parallel to the roller surface. Then the crack propagated in a range of 20 degrees -45 degrees for the crack that progressed in parallel with the surface. To examine what kind of subsurface stress affected the crack, internal stresses around hole were calculated with FEM. The factor that affected the initiation of cracks would be the maximum shear stress τ_<max>, and the factor that affected the propagation of cracks would be the orthogonal shear stress τ_<yz>.

    DOI: 10.1299/jsmempt.2007.43

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  • 101 Increase in Fatigue Strength of Steel Gear by Cavitation Shotless Peening

    SEKI Masanori, SOYAMA Hitoshi, FUJII Masahiro, YOSHIDA Akira

    The Proceedings of the Symposium on Motion and Power Transmission   2007   23 - 26   2007

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    In order to investigate the effect of cavitation shotless peening on fatigue strength of steel gears, the case-hardened steel rollers and gears cavitation shotless peened under different conditions were fatigue-tested using a roller testing machine and a gear testing machine. The hardness and the compressive residual stress of the test rollers and gears were increased by cavitation shotless peening. On the other hand, their surface roughness was not increased so much. In the fatigue tests, the fatigue life of most cavitation shotless peened rollers and gears was longer than that of the non-peened roller and gear. In particular, the fatigue life of cavitation shotless peened rollers and gears was significantly improved by using a modified nozzle for a high-speed water jet to obtain a greater peening effect. Therefore, it was found that the cavitation shotless peening is good for the increase in fatigue strength of steel gears.

    DOI: 10.1299/jsmempt.2007.23

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  • 120 Influence of Viscosity Characteristics of Lubricating Oil On Rolling Fatigue Strength of Steel Roller

    FUJII Masahiro, SAIKI Takuya, MANABE Yoshitaka, SAEKI Shin, YOSHIDA Akira

    The Proceedings of the Symposium on Motion and Power Transmission   2007   90 - 93   2007

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    Rolling contact fatigue test with three kinds of lubricating oil was carried out in order to clarify the influence of viscosity characteristics of lubricating oil on rolling fatigue strength of steel roller. Each lubricating oil was different in viscosity of base oil and blending quantity of the viscosity index improver. In case of the test under the lubricants with equivalent kinematic viscosity, the rolling contact fatigue life depended on the viscosity of the base oil and was longer in case that the base oil of the lubricant had the higher kinematic viscosity. In case of the rolling fatigue test under lubricant made from same base oil, the rolling contact fatigue life was longer in case of the rolling fatigue test under the lubricant with higher kinematic viscosity, Small spot marks with relatively high roughness would occur by non-destructive scuffing.

    DOI: 10.1299/jsmempt.2007.90

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  • 1002 Effect of WC/C Coating on Fatigue Life of Case-Hardened Steel Gear

    Seki Masanori, Fujii Masahiro, Yamaguchi Hiroyuki, Yoshida Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2007 ( 45 )   367 - 368   2007

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    DOI: 10.1299/jsmecs.2007.45.367

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  • 918 Surface Failure of Steel Roller under Traction Oil Lubrication

    FUJII Masahiro, MIZUNO Yasuhide, NAGAO Kazuya, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2007 ( 45 )   361 - 362   2007

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    DOI: 10.1299/jsmecs.2007.45.361

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  • 912 Influence of Crowning Radius of Steel Roller on Traction Coefficient

    FUJII Masahiro, NAGAO Kazuya, MIZUNO Yasuhide, YOSHIDA Akira

    The Proceedings of Conference of Chugoku-Shikoku Branch   2007 ( 45 )   349 - 350   2007

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    DOI: 10.1299/jsmecs.2007.45.349

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  • 5121 Friction and Wear of Plasma CVD Diamond-Like Carbon Coating Deposited on Gear and Roller

    FUJII Masahiro, YOSHIDA Akira, OGASAWARA Hisashi, HANADA Toshihisa

    The proceedings of the JSME annual meeting   2006   189 - 190   2006

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    Friction and wear performance of plasma CVD Diamond-Like Carbon coating deposited on a spur gear and a roller made of stainless steel was investigated. A spur gear test and a roller test were carried out under non-lubricating condition in high vacuum. A roller test was also performed under oil lubrication. The wear performance of the thick DLC coating was comparatively superior. The radical nitriding pretreatment was effective against wear of DLC coating. The wear performance of DLC coating on the gear was similar to that on the roller. Though the wear in the roller test was much smaller than that in the gear test, the specific wear amounts in both the two tests were almost the same with each other.

    DOI: 10.1299/jsmemecjo.2006.4.0_189

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  • Rolling Contact Fatigue Characteristics of Newly Developed bearing Steel Ball and Washer at a Temperature Range of 313 K to 403 K

    Hiroshi Osaki, Ryousuke Ano, Akira Yoshida, Masahiro Fujii

    Proceedings of The third Asia International Conference on Tribology   2006

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  • 911 Rolling Contact Fatigue Strength of Thrust Bearing Made of Newly Developed Bearing Steel

    OHSAKI Hiroshi, ANO Ryousuke, FUJII Masahiro, YOSHIDA Akira, KONDO Toshiyuki

    The Proceedings of Conference of Chugoku-Shikoku Branch   2006 ( 44 )   359 - 360   2006

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    DOI: 10.1299/jsmecs.2006.44.359

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  • 907 Influence of Coating Thickness on Friction and Wear of DLC Coating in High Vacuum

    FUJII Masahiro, YOSHIDA Akira, OGASAWARA Hisashi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2006 ( 44 )   351 - 352   2006

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    DOI: 10.1299/jsmecs.2006.44.351

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  • 903 Friction and Wear of Spur Gear and Roller Treated by DLC Coating in High Vacuum

    FUJII Masahiro, YOSHIDA Akira, HANADA Toshihisa

    The Proceedings of Conference of Chugoku-Shikoku Branch   2006 ( 44 )   343 - 344   2006

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    DOI: 10.1299/jsmecs.2006.44.343

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  • 2206 Rolling Contact Fatigue of Steel Roller under Traction Oil Lubrication

    FUJII Masahiro, YOSHIDA Akira, Seesregdorj BAYASGALAN, NAGAO Kazuya, MINEGISHI Kiyoji, TAMENAGA Jun

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2006 ( 6 )   203 - 204   2006

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    A rolling contact fatigue test was carried out under a traction oil lubricating condition and the test result was compared with that under a turbine oil lubricating condition. The minimum film thicknesses under both lubricating conditions were almost equal. The failure mode of both lubricating conditions was pitting caused by surface cracking. The rolling contact fatigue strength under the traction oil lubricating condition was greater than that under the turbine oil lubricating condition. The cracks observed on the roller surfaces tested under the traction oil lubricating condition were the longer along the axial direction of the rollers.

    DOI: 10.1299/jsmemdt.2006.6.203

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  • Friction and Wear of Stainless Steel with Dispersed Self-Lubricating Precipitations

    M.Fujii, A.Yoshida, K.Miura

    Book of Synopses, International Tribology Conference Kobe 2005   2005

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  • 810 Influence of Thickness of Sprayed Layer on Rolling Contact Fatigue of Alumina Ceramics Thermal Sprayed Roller

    FUJII Masahiro, YOSHIDA Akira, MA Jiabin, ISHIMARU Jun, SHIGEMURA Sadato, TANI Kazumi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2005 ( 43 )   295 - 296   2005

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    DOI: 10.1299/jsmecs.2005.43.295

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  • Transmission Efficiency and Non-contacting Torque of Spur Gear Pair Working Magnetic Repulsion between Teeth Flanks

    T.Harano, A.Yoshida, M.Fujii, D.Miyamoto, Y.Iwasa

    Proceedings of International Conference on Manufacturing, Machine Design and Tribol-ogy ICMDT   2005

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  • Improving Methods of Wear Resistance in Heavy Loaded Sliding Friction Pairs

    V.I.KLOCHIKHIN, M.Fujii, A.Yoshida

    Memoirs of the Faculty of En-gineering, Okayama University   2005

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  • 811 Measurement and Analysis of Pressure Distribution of Aerostatic Guide with Porous Fine Ceramics

    FUJII Masahiro, YOSHIDA Akira, LIU Sijian, MASADA Keiichi, NAGASHIO Hisao, YOSHIKAWA Masahiro

    The Proceedings of Conference of Chugoku-Shikoku Branch   2005 ( 43 )   297 - 298   2005

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    DOI: 10.1299/jsmecs.2005.43.297

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  • Rolling Contact Fatigue Strength and Young's Modulus of Plasma Sprayed Alumina Coating

    Kazumi TANI, Sadato SHIGEMURA, Masahiro FUJII, Akira YOSHIDA

    Proceedings of International Thermal Spray Conference ITSC2004   2004

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  • Friction and Wear Characteristics of DLC at High Temperature in Vacuum

    FUJII Masahiro, YOSHIDA Akira, SHIMAZU Yoshiomi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2004 ( 42 )   415 - 416   2004

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    DOI: 10.1299/jsmecs.2004.42.415

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  • Friction and Wear of Particle Dispersed Composite Plated Rollers

    FUJII Masahiro, YOSHIDA Akira, ISHIMARU Jun

    The Proceedings of the Symposium on Motion and Power Transmission   2004   313 - 314   2004

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    In order to investigate the influence of dispersed particles on friction and wear of electroless composite plating, two-roller test was carried out under oil lubricating condition and in vacuum. The dispersed particles were PTFE and SiC. In vacuum, the friction coefficient decreased and the wear increased, with increasing content of dispersed particles. Under oil lubrication, the friction was low and the wear increased at comparatively early stage in only the case of a particle-content of 30%. Stresses in the plated layer were calculated with FEM. The maximum Mises stress in the plated layer increased with increasing content of dispersed particles.

    DOI: 10.1299/jsmempt.2004.313

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  • Influence of Crowning on Rolling Contact Fatigue of SUJ2 Rollers

    FUJII Masahiro, YOSHIDA Akira, HAMADA Takeshi, BAYASAGALAN Seesregdorj, MINEGISHI Kiyoji, TAMENAGA Jun

    The Proceedings of the Symposium on Motion and Power Transmission   2004   182 - 183   2004

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    This paper describes about influence of crowning on rolling contact fatigue of steel roller. The edge load at the contact edge and subsurface shear stresses were calculated with FEM. In case that no edge load or minor edge load, the rolling contact fatigue strength of rollers evaluated with the normal load increased with increasing the crowning radius. The stressed volume varied widely with the crowning radius. The rolling contact fatigue strength should be evaluated from the point of view of the stressed volume.

    DOI: 10.1299/jsmempt.2004.182

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  • Friction and Wear Characteristics of Wear Resisting Stainless Steel : Results under oil lubrication and in Vacuum

    FUJII Masahiro, YOSHIDA Akira, ORITA Hideaki, MIURA Kenzo

    The Proceedings of Conference of Chugoku-Shikoku Branch   2004 ( 42 )   413 - 414   2004

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    DOI: 10.1299/jsmecs.2004.42.413

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  • Influence of Crowning on Rolling Contact Fatigue of Steel Roller : Contact Stress Analysis

    FUJII Masahiro, YOSHIDA Akira, TABUCHI Takahito, MINEGISHI Kiyoji, TAMENAGA Jun

    The Proceedings of Conference of Chugoku-Shikoku Branch   2004 ( 42 )   403 - 404   2004

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    DOI: 10.1299/jsmecs.2004.42.403

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  • Improvement of Friction and Wear Characteristics of Stainless Steel by Dispersed Precipitations

    Fujii Masahiro, Yoshida Akira, Miura Kenzo

    The proceedings of the JSME annual meeting   2004   109 - 110   2004

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    The friction and wear characteristics of newly developed stainless steel with dispersed precipitations, which was designed for improving friction and wear characteristics, were investigated with ring-on-disk test apparatuses under non-lubricating condition in air and in vacuum. The friction and wear behaviors were compared with those of JIS SUS420J2 stainless steel. Both friction coefficient and wear amount of the stainless steel with dispersed precipitations were smaller than those of SUS420J2. The extent of transference of wear debris was comparatively small in case of the stainless steel with dispersed precipitations. The stainless steel with dispersed precipitations had the superior friction and wear characteristics.

    DOI: 10.1299/jsmemecjo.2004.4.0_109

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  • Rolling Contact Fatigue of Alumina Ceramics Sprayed Roller

    Yoshida Akira, Fujii Masahiro, Yuki Kenji, Shigemura Sadato, Tani Kazumi

    2003 ( 41 )   283 - 284   2003.2

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  • Friction and Wear of Surface Modified Stainless Steel Gears and Rollers in High Vacuum

    Masahiro Fujii, Akira Yoshida, Tomoki Harano

    2003 ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference (CD-ROM)   2003

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  • Friction and Wear of Electroless Ni Based Alloy Platings under Oil Lubricating Condition

    FUJII Masahiro, YOSHIDA Akira, ORITA Hideaki

    The proceedings of the JSME annual meeting   2003   127 - 128   2003

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    The authors examined friction and wear characteristics of electroless Ni based alloy platings under oil lubricating condition with ring-on-disk test machine. Electroless Ni-P alloy plating, electroless Ni-B alloy plating and electroless Ni-P-B alloy plating were employed. In case of the combination of the electroless Ni-B alloy plating and the electroless Ni-P-B plating the wear occurred in the lowest contact pressure. The friction behavior was the most stable in case of the combination of the electroless Ni-B alloy plating and the electroless Ni-P alloy plating. The friction coefficient of the self-mated electroless Ni-P-B plating was small, while the wear was comparatively large.

    DOI: 10.1299/jsmemecjo.2003.4.0_127

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  • Influence of Dispersed Particles on Friction and Wear of Electroless Composite Platings

    YOSHIDA Akira, FUJII Masahiro, MORITA Yuuichi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2003 ( 41 )   285 - 286   2003

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    DOI: 10.1299/jsmecs.2003.41.285

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  • Fundamental Study on Aerostatic Guide with Porous Fine Ceramics

    Fujii Masahiro, Yoshida Akira, Liu Sijian, Nagashio Hisao, Yoshikawa Masahiro

    The proceedings of the JSME annual meeting   2003   199 - 200   2003

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    In order to examine the possibility of applying newly developed porous fine ceramics to aerostatic guides, the static stiffness of an externally pressurized gas thrust bearing made of the porous fine ceramics was investigated. The area and center-to-center distance of pores were analyzed with image processing technique. 60% of the pores of the tested fine ceramics were of 40μm in diameter and the mean center-to-center distance was 85.4μm. The dimensionless static stiffness of the tested porous fine ceramics was 0.45-0.6 at a bearing clearance around 5μm. The tested porous fine ceramics would be applied to aerostatic guides.

    DOI: 10.1299/jsmemecjo.2003.4.0_199

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  • Friction and Wear of Thermal Diffused Sn Plated Stainless Steel at High Temperature in Vacuum

    FUJII Masahiro, YOSHIDA Akira, SHIMADZU Yoshiomi

    The proceedings of the JSME annual meeting   2003   129 - 130   2003

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    In order to investigate friction and wear characteristics of the thermal diffused Sn plated stainless steel in vacuum, ring on disk tests were performed. In case of the tests in vacuum the friction coefficient at high temperature was slightly smaller than that at room temperature, while the specific wear rate at high temperature was greater than that at room temperature. In case of the tests in vacuum the friction behavior was stable and the wear was small after the wear depth was equivalent to the thickness of the modified layer. On the contrary both the friction coefficient and the wear were increased with increasing sliding distance and the wear exceeded the modified layer.

    DOI: 10.1299/jsmemecjo.2003.4.0_129

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  • Stress Distributions of Surface Modified Layer under Hertzian Contact

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki

    講演論文集   2002   181 - 182   2002.10

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    DOI: 10.1299/jsmecs.2002.181

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  • Evaluation of Tooth Flank Wear of Surface-Modified Gear in High Vacuum

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, FUNO Yasuaki

    講演論文集   2002 ( 40 )   361 - 362   2002.2

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    DOI: 10.1299/jsmecs.2002.40.361

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  • Friction and Wear Characteristics of Composite Modified Layer in Vacuum

    YOSHIDA Akira, FUJII Masahiro, OKAUCHI Takeshi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2002 ( 40 )   363 - 364   2002

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    DOI: 10.1299/jsmecs.2002.40.363

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  • Friction and Wear Characteristics of Wear Resisting Stainless Steel

    YOSHIDA Akira, FUJII Masahiro, KOBAYASHI Hiroshi, MIURA Kenzo

    The Proceedings of Conference of Chugoku-Shikoku Branch   2002 ( 40 )   365 - 366   2002

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    DOI: 10.1299/jsmecs.2002.40.365

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  • Tribological Performance of Particle Dispersed Composite Plating in High Vacuum

    YOSHIDA Akira, FUJII Masahiro

    The Proceedings of the Machine Design and Tribology Division meeting in JSME   2002 ( 2 )   203 - 204   2002

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    Roller test and ring/disk test were carried out under non-lubricating condition in high vacuum to investigate the tribological performance of particle dispersed composite platings based on electroless Ni-P alloy. Three kinds of composite platings, in which PTFE particles, BN particles, and SiC particles were dispersed, were employed. The wear rate of both plated layers with BN particles and with PTFE particles increased with increasing content of dispersed particles. The wear rate of the layer with PTFE particles was greater than that with BN particles. The influence of elastic modulus of dispersed particles on stresses in the plated layer was investigated with FEM analysis. The maximum values of Mises stress in the plated layer increased with increasing particle content and with decreasing elastic modulus of particles. The wear behavior obtained in the experiment could be well explained by the calculated stress field.

    DOI: 10.1299/jsmemdt.2002.2.203

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  • Ni系めっき表面の真空・高温摩擦摩耗特性

    吉田 彰, 藤井 正浩, 岡内 健

    社団法人日本設計工学会研究発表講演会講演論文集   2001 ( 2 )   69 - 72   2001.9

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  • Study of Optimum Disperased Particle Size for Wear of Multiplex Plated Surfaces

    Akira Yoshida, Masahiro Fujii, R.S.Dwyer-Joyce

    CD-ROM, 2nd World Tribology Congress WTC2001   2001

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  • Effect of Surface Modified Layer on Rolling Fatigue Strength

    Akira Yoshida, Masahiro Fujii

    Proceedings of the JSME International Conference on Motion and Power Transmissions MPT2001-Fukuoka   2001

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  • 907 Evaluation of Wear Process on Modified Surface with Fractal Dimension

    Yoshida Akira, Fujii Masahiro, Yanai Kannosuke

    The Proceedings of Conference of Chugoku-Shikoku Branch   2001 ( 39 )   323 - 324   2001

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    DOI: 10.1299/jsmecs.2001.39.323

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  • 908 Analytical Study on Influence of Particle Diameter on Strength of Multiplex Plating Layer with Dispersed Particle

    YOSHIDA Akira, FUJII Masahiro, UEJI Yoshitaka

    The Proceedings of Conference of Chugoku-Shikoku Branch   2001 ( 39 )   325 - 326   2001

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    DOI: 10.1299/jsmecs.2001.39.325

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  • 909 Scuffing and Wear Characteristics of Wear Resisting Stainless Steel

    YOSHIDA Akira, FUJII Masahiro, HORIGUCHI Kiyoshi

    The Proceedings of Conference of Chugoku-Shikoku Branch   2001 ( 39 )   327 - 328   2001

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    DOI: 10.1299/jsmecs.2001.39.327

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  • 912 Friction and Wear of Electroless Plating with Nickelic Alloy Matrix in Gear Test under High Vacuum

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, OHMAE Katsuyoshi

    講演論文集   5 ( 1 )   321 - 322   2000.2

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    DOI: 10.1299/jsmecs.005.1.321

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  • Tribological Behaviors of Multiplex Plated Stainless Steel Rollers in High Vacuum

    Akira Yoshida, Masahiro Fujii, Tomiki Harano

    International Tribology Conference NAGASAKI 2000   2000

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  • 702 Study on Application of Fractal Dimension to Evaluate Wear Surface

    Yoshida Akira, Fujii Masahiro, Yanai Kannosuke

    The Proceedings of Conference of Chugoku-Shikoku Branch   5 ( 2 )   203 - 204   2000

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    DOI: 10.1299/jsmecs.005.2.203

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  • Influence of Surface Modification on Rolling Contact Fatigue of Steel Rollers (In Case of Pure Rolling Contact Condition) Reviewed

    Akira Yoshida, Masahiro Fujii, Hiroshi Nakajima

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   66 ( 641 )   275 - 282   2000

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    Surface modified rollers by electroless Ni-P alloy plating and sulfurizing were fatigue-tested under a pure rolling contact condition. The fatigue lives of both surface modified rollers were longer than that of the non-coated rollers and the fatigue strength of the sulfurized rollers was the highest. The influence of elastic modulus of a plated layer on the contact pressure and the subsurface stresses was examined with numerical analyses. The contact pressure and the subsurface stresses of a roller covered with a plated layer, whose elastic modulus was smaller than that of the substrate, were smaller than those of a non-coated roller, especially at the edge of the contact width. The conformity by the wear of the plated layer led to the reduction of the contact pressure and the subsurface stresses at the edge of the contact width. The reason why the fatigue strength of the surface modified rollers were greater than that of the non-coated rollers could be due to the smaller contact pressure and the smaller subsurface stresses. © 2000, The Japan Society of Mechanical Engineers. All rights reserved.

    DOI: 10.1299/kikaic.66.275

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  • Friction and Wear of Surface Modified Rollers in High Vacuum (Comparison of the Results in Two cylinder Test and Gear Test)

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, MIURA Kenzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   65 ( 633 )   2034 - 2041   1999.5

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    To clarify the friction and wear characteristics of surface modified rollers in vacuum, two cylinder test was carried out under non-lubricating condition in high vacuum less than 2 × 10^<-3> Pa. Thermal diffusion after Sn plating (Sn), electroless Ni-P plating (Ni-P) and sulfurizing were employed here. Friction coefScient of the surface modified rollers was smaller than that of non-coated rollers. The initial friction coefficient of Sn plated rollers increased under low contact pressure, where wear particles were transferred onto the frictional surface, while the friction coefficient decreased when surface modified layer worn uniformly. The sulfurizing contributed to the reduction of the initial friction. The friction behavior of Ni-P plated rollers indicated the most stable in all test rollers. In addition, the relation between the test results in the two cylinder tests and the previous gear tests in high vacuum using the same surface modification treatment as employed in these two cylinder tests was evaluated. The initial friction in the two cylinder test was greater than that in the gear test in the cases of non coat, Sn and Ni-P. However, where sliding distance was large enough, the friction behavior in the gear test was similar to that in the two cylinder test.

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  • Friction and Wear Characteristics of Surface Modified SUS440C Spur Gears in High Vacuum

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, MIURA Kenzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   65 ( 632 )   1661 - 1668   1999.4

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    In order to investigate the friction and wear characteristics of surface modified spur gears made of stainless steel SUS440C in high vacuum, gear tests were carried out under non-lubricating condition in vacuum to be on the order of 10^<-4> Pa. In addition, dynamic load on spur gear teeth with surface modified layer was evaluated. Electroless Ni-P alloy plating (Ni-P plating), sulfurizing and Sn plating with thermal diffusion (Sn plating) were employed. From the gear tests, the following results were obtained. (1) The friction coefficient of the surface modified gears was smaller than that of the non-coated gears. (2) The initial friction of Sn plated gear increased under low pressure and low rotational speed conditions. After Sn plated layer wore uniformly, the friction coefficient was the smallest by the lubricating effect of thermally diffused layer of Sn. (3) The sulfurized layer contributed to the reduction of initial friction. However, the friction behavior of sulfurized gear was the same as that of non-coated gears, after the sulfurized layer wore completely. (4) Wear amount and tooth profile error of Ni-P plated gears were the largest of all the test gears.

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  • 表面改質ローラの高真空中における摩擦-摩耗(平歯車試験とローラ試験の比較)

    吉田 彰, 藤井正浩, 原野智哉, 三浦健藏

    日本機械学会論文集(C編)   1999

  • Tribological Characteristics of α-Sialon and Al2O3 at High Temperature

    Akira Yoshida, Masahiro Fujii

    Proceedings of the International Conference on Advanced Technology in Experimental Mechanics '99   1999

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  • Tribological Behaviors of Surface Modified Spur Gears in High Vacuum

    Akira Yoshida, Masahiro Fujii, Tomoki Harano

    Proceedings of Tenth World Congress on the Theory of Machines and Mechanisms   1999

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  • 表面改質されたSUS440C製平歯車の高真空中における摩擦・摩耗特性

    吉田 彰, 藤井正浩, 原野智哉, 三浦健藏

    日本機械学会論文集(C編)   1999

  • Rolling Contact Fatigue and Scuffing of Surface Modified Rollers(In Case of Elecrtroless Ni-P Alloy Plated Rollers and Sulfurized Rollers) Reviewed

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, KIMURA Tetsuya, SHAO Huijiang, MIURA Kenzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   64 ( 621 )   1801 - 1807   1998.5

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    The influence of the surface modification treatment on the rolling contact fatigue and the scuffing capacity of rollers was examined by two cylinder test under oil lubrication. The surfaces of test rollers were modified by the electroless Ni-P alloy plating and the sulfurizing. The rolling contact fatigue strength and the scuffing capacity of the surface modified rollers were larger than those of the non-coated rollers. In the fatigue test the failure mode of both the surface modified rollers and the non-coated rollers was the spalling caused by subsurface cracking. The friction coefficient of the Ni-P plated rollers was smaller than that of the non-coated rollers, and the surface roughnesses of the modified rollers were decreased with increasing wear of modified layers. The small friction coefficient and the small roughness contribute to the improvement of the scuffing capacity, and moreover they might reduce the surface contact stresses and the rolling contact fatigue strength might be improved.

    DOI: 10.1299/kikaic.64.1801

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  • Influence of Hardness and Surface Modification Treatment on Scuffing of Wear Resisting Steel

    YOSHIDA Akira, FUJII Masahiro, HARANO Tomoki, KIMURA Tetsuya, MIURA Kenzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   64 ( 619 )   1041 - 1048   1998.3

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    A wear resisting steel was developed in the expectation that it may supersede high phosphorus gray cast iron for improving the strength of sliding elements of a marine diesel engine. In order to investigate the influence of the surface hardness and the surface modification treatment on the scuffing capacity of the wear resisting steel, the two cylinder test was carried out under oil lubrication. The test rollers had two kinds of hardnesses; one was 860 HV for bearings, and the other was 370 HV for sliding materials of cylinders. The electroless Ni-P alloy plating and sulfurizing treatments were employed. The scuffing capacity of the wear resisting steel was larger than that of the high chromium bearing steel SUJ 2. The scuffing capacity of the harder wear resisting steel was smaller than that of the softer one. The electroless Ni-P plating treatment slightly increased the scuffing capacity, while the sulfurizing treatment had no effect on the scuffing capacity of the wear resisting steel.

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  • Friction and Wear of Al_2O_3 against Sialon, ZrO_2, Al_2O_3, and SUS304 in Journal Sliding Bearing Test

    YOSHIDA Akira, FUJII Masahiro, NAGAMORI Keiji, HAISHI Hideki

    Transactions of the Japan Society of Mechanical Engineers. Series C.   63 ( 614 )   3600 - 3605   1997.10

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    Journal sliding bearing tests were performed under non-lubricated and water-lubricated conditions. Journals made of Al_2O_3 were slid against bushes made of Sialon, ZrO_2, Al_2O_3, and SUS304 stainless steel. The Al_2O_3/Al_2O_3 combination exhibited the best performance under these test conditions. The wear amount and friction coefficient under the water-lubricated condition were smaller than those under the non-lubricated condition except for the case of Sialon/Al_2O_3 combination. The wear of Sialon might be increased under the influence of the hydrate formed on the sliding surface by tribochemical reaction. The wear amount of Al_2O_3 journal was largest in the case of SUS304/Al_2O_3 combination, in which the wear mode was micro-chipping. On application of Al_2O_3 under the water-lubricated condition, wear of Sialon in the case of Al_2O_3/Sialon combination, stress corrosion wear of ZrO_2 in the case of Al_2O_3/ZrO_2 combination, and wear of Al_2O_3 by micro-chipping in the case of Al_2O_3/SUS304 combination must be considered.

    DOI: 10.1299/kikaic.63.3600

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  • Friction and Wear Characteristics of Fine Ceramics at Environmental Temperature up to 1273K Reviewed

    YOSHIDA Akira, FUJII Masahiro, ZHANG Qihao, NAGAMORI Keiji, HAISHI Hideki

    Journal of Japanese Society of Tribologists   41 ( 10 )   836 - 843   1996.10

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  • Tribological Characteristics of Ceramic Thrust Bearing under Water Lubrication

    YOSHIDA Akira, FUJII Masahiro, ZHANG Qihao, NAGAMORI Keiji, HAISHI Hideki

    Transactions of the Japan Society of Mechanical Engineers. Series C.   62 ( 599 )   282 - 2803   1996.7

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    Thrust bearing tests were carried out under water lubrication with hot-pressed Sialon, ZrO_2 and Al_2O_3 fine ceramics. The life of Sialon balls mating with Sialon races was the highest, and it was reduced when mating with ZrO_2 or Al_2O_3 races. The lives of ZrO_2 balls and Al_2O_3 balls mating with Sialon races were longer than those of their self-mated contact. Th friction coefficient of thrust bearings consisting of Sialon balls and/or races was comparatively small. The amount of wear of balls or races mating with Sialon was small, while that of Sialon mating with ZrO_2 or Al_2O_3 was large. The main failure modes of Sialon balls were flaking in the case mating with Sialon races, and wear in the cases mating with ZrO_2 and Al_2O_3 races. Those of ZrO_2 and Al_2O_3 balls were wear with micro flaking, and wear, respectively.

    DOI: 10.1299/kikaic.62.2798

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  • Rolling Contact Fatigue of Hot-Pressed Sialon Balls

    YOSHIDA Akira, FUJII Masahiro, ZHANG Qihao

    Transactions of the Japan Society of Mechanical Engineers. Series C.   61 ( 581 )   192 - 197   1995.1

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    The rolling contact fatigue life, reliability and failure mode of Sialon balls were examined through the rolling contact fatigue tests of the hybrid thrust bearing consisting of hot-pressed Sialon balls and bearing steel SUJ2 races. The rolling contact fatigue life of the Sialon balls was complied with the three-parameter Weibull distribution. In case of the smallest balls, the surface of which exhibits micro flaking with increasing the number of cycles, the shape parameter was relatively small and the fatigue life was comparatively dispersed. The rolling contact fatigue life might be influenced by the defects at the surface layer. The average value of the maximum flaking depths lay between the depth of the maximum value of the orthogonal shear stress τ_<yz> and the depth of maximum value of the maximum shear stress τ_<45°>.

    DOI: 10.1299/kikaic.61.192

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  • FRICTION AND WEAR CHARACTERISTICS OF FINE CERAMICS BY PIN-ON-DISK AND JOURNAL SLIDING BEARING TESTS .2. IN WATER

    A YOSHIDA, M FUJII, K NAGAMORI, H HAISHI, K TAKAKURA, QH ZHANG

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   38 ( 10 )   895 - 902   1993

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  • FRICTION AND WEAR CHARACTERISTICS OF FINE CERAMICS BY PIN-ON-DISK AND JOURNAL SLIDING BEARING TESTS .1. IN LABORATORY AIR

    A YOSHIDA, M FUJII, K NAGAMORI, H HAISHI, T KUWADA, MG LIU

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   37 ( 1 )   61 - 68   1992

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  • FRICTION AND WEAR CHARACTERISTICS OF FINE CERAMICS BY PIN-ON-DISK AND JOURNAL SLIDING BEARING TESTS .1. IN LABORATORY AIR

    A YOSHIDA, M FUJII, K NAGAMORI, H HAISHI, T KUWADA, MG LIU

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   37 ( 1 )   61 - 68   1992

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  • A Method for Evaluating Friction Coefficient on Spur Gear Tooth Flanks. Examinations with a Rack Model.

    小幡文雄, 原野智哉, 吉田彰, 藤井正浩, 小西大二郎

    日本機械学会全国大会講演論文集   69th ( Pt C )   289 - 291   1991.10

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    The friction coefficient of gear tooth flanks is an important factor in clarifying the mechanism of surface failures such as pitting and scoring and in improving the performance of power transmission gears. This is a basic study to establish a method for evaluating the friction coefficient of a spur gear pair under uniformly distributed load along the tooth trace using the fillet strains measured by strain gauges. Experiments with a rack model were carried out with static loads. The frictional and normal forces acting on the working flank were derived by solving the system of equations concerning the fillet strains on the working and nonworking flank sides. The accuracy of the ratio of the friction force to the normal force was examined. The results demonstrate that in order to obtain a meaningful friction coefficient of spur gears it is very important to consider the independence of the relation between the fillet strain and the forces on the working flank.

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  • Pitting of a Thermally Refined Steel Roller : Further Investigations by Specific Sliding Varying-Type Contact Roller Tests

    YOSHIDA Akira, FUJII Masahiro, OHUE Yuji, OBATA Fumio

    Transactions of the Japan Society of Mechanical Engineers. Series C.   57 ( 536 )   1363 - 1370   1991.4

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    Thermally refined steel rollers were fatigue-tested under varying specific sliding conditions using a newly developed specific sliding varying-type contact roller testing machine to which an eccentric gear mechanism was applied. The test results were discussed in relation to factors such as specific sliding and frictional torque changes. The surface durability of the roller under a varying specific sliding condition was lower than that under a constant specific sliding condition. The surface durability under a condition where specific sliding was negative on a non-uniform velocity roller was lower than that under a condition of negative specific sliding on a uniform velocity roller. The pitting easily occurred in the negative specific sliding region under high tangential force and at the deceleration process of the rotating roller.

    DOI: 10.1299/kikaic.57.1363

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  • Influence of Tip Relief on Working Flank Bulk Temperature in Spur Gears

    FUJII Masahiro, OBATA Fumio, YOSHIDA Akira

    Transactions of the Japan Society of Mechanical Engineers C   56 ( 526 )   p1564 - 1569   1990.6

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    The influence of tip relief on the approach side on the working flank bulk temperature, which has an intimate relationship with scoring occurrence, was studied taking the change of dynamic load into account. The amount of tip interference may be estimated well by Weber and Banaschek's formula for tooth deflection. The working flank bulk temperature is affected more by the change of dynamic load due to the tip relief than by the tip interference. The amount of the tip relief on the approach side and the range of the tip relief should be determined taking the influence of the dynamic load on the working flank bulk temperature into consideration.

    DOI: 10.1299/kikaic.56.1564

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  • Influence of Dynamic Load on Scoring Capacity in Spur Gears

    FUJII Masahiro, OBATA Fumio, YOSHIDA Akira, MATSUDA Hiroshi

    Transactions of the Japan Society of Mechanical Engineers. Series C.   56 ( 523 )   p750 - 758   1990.3

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    The influence of dynamic load on storing capacity was studied using gears having tooth profile errors on the recess sides. Scoring capacity in spur gears is more affected by specific sliding than by dynamic load and increases as specific sliding is decreased. In the mixed lubrication state, the scoring bulk temperature of the working tooth flank is barely influenced by dynamic load when the tip interference on the approach side is negligible, and it may be well estimated by the bulk temperature on the outer surface of the cylinder immediately before seizure in two-cylinder tests. In the calculation of the bulk temperature of the working tooth flank, it is essential to take account of dynamic load and tip interference as well as the heat transfer coefficient and friction coefficient.

    DOI: 10.1299/kikaic.56.750

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  • 機械工学年鑑(1988年)--設計・機素・トライボロジ-

    佐藤 武, 吉田 彰, 藤井 正浩, 中込 昌考, 遠山 茂樹, 賀勢 晋司, 加藤 道生, 森 淳暢, 相原 了, 中村 研八, 三宅 正二郎, 倉橋 基文, 平田 昌邦, 西村 允, 森田 真史

    日本機械学会論文集 C編   55 ( 516 )   p1825 - 1830   1989.8

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  • Effects of Tooth Profile on Scoring Behavior in Spur Gears

    FUJII Masahiro, OBATA Fumio, YOSHIDA Akira, MATSUDA Hiroshi, FUJITA Komei

    Transactions of the Japan Society of Mechanical Engineers. Series C.   55 ( 512 )   p1017 - 1025   1989.4

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    To find out a fundamental tooth profile design policy for the scoring of spur gears, the effects of tooth profiles on scoring behavior were examined taking account of the two-cylinder test results. The tip interference on the approach side markedly affects the scoring phenomena. Both the reduction of the maximum specific sliding on the geometrical working flanks and the avoidance of tip interference on the approach side are the essential conditions to obtain spur gears having superior scoring load capacity. In the mixed lubrication state, where the scoring occurrence has an intimate relation with the working flank bulk temperature, the scoring bulk temperature of a spur gear pair with no tip interference on the approach side can be estimated well by the bulk temperature on the outer surface of the cylinder immediately before seizure in two-cylinder tests.

    DOI: 10.1299/kikaic.55.1017

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  • 潤滑油の耐スコ-リング能-1-ギヤ油基油の平歯車試験結果と2円筒試験結果の相関

    小幡 文雄, 藤田 公明, 藤井 正浩

    潤滑   32 ( 9 )   p679 - 686   1987.9

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  • Scoring in Spur Gear Pairs : 3rd Report, Increase in Scoring Load Capacity Due to Tooth Profile Wear on the Approach Side

    OBATA Fumio, FUJITA Komei, FUJII Masahiro, MATSUDA Hiroshi, MATSUO Kohei

    Transactions of the Japan Society of Mechanical Engineers. Series C.   53 ( 486 )   p444 - 450   1987.2

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    The influence of tip interference on scoring load capacity was studied using gears having tooth profile wear due to scoring on the approach side. The results were compared with those obtained with gears having no profile wear from viewpoints of scoring load and scoring temperature, taking the lubrication state on the working flank into consideration. The tip interference on the approach side should be reduced because, unlike on the recess side, it diminishes the scoring load capacity. In the mixed lubrication state, the bulk temperature on the working flank is suitable for an index in calculating the scoring load capacity of a spur gear pair. The scoring temperature on the recess side can be estimated well by the bulk temperature on the outer surface of the cylinder just before seizure in two-cylinder tests, provided that the specific sliding and the sliding velocity at the end of gear meshing are taken into account.

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  • Scoring in Spur Gear Pairs : 2nd Report, Scoring Temperatures in Case of EP Oils

    OBATA Fumio, FUJITA Komei, FUJII Masahiro, MASTUO Kohei

    Transactions of the Japan Society of Mechanical Engineers. Series C.   52 ( 484 )   p3256 - 3263   1986.12

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    As a basis for establishing a calculation method of the scoring load capacity of a spur gear pair, the relation of the scoring occurrence to the temperature and the correlation between the gear test results and the two-cylinder test results were examined for EP oils using an IAE type high-speed gear test rig. An increase in the chemical reactivity of the EP oil causes an increase in the anti-scoring capacity of the EP oil. Unlike the maximum value of the maximum contact surface temperature and the integral temperature, in the mixed lubrication state, the working flank bulk temperature just before scoring is affected by the rotating speed to a lesser extent. Also in the EP oils, as in the gear base oil, the scoring temperature of a spur gear pair in the mixed lubrication state can be estimated by the outer surface bulk temperatures just before seizures in the two-cylinder tests taking the specific sliding and the sliding velocity at the beginning or the end of gear meshing into consideration.

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  • Bulk Temperature Rise On Working Flanks in Spur Gears

    OBATA Fumio, FUJITA Komei, FUJII Masahiro

    Transactions of the Japan Society of Mechanical Engineers. Series C.   52 ( 480 )   2174 - 2180   1986.8

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    The bulk temperature rise was studied when a moving heat source with variable heat quantity was supplied repeatedly at regular intervals on the surface of an isotropic and homegeneous rectangular shaped body used as a model of a spur gear tooth. The effect of radiation at the inner surface of a boss on the bulk temperature rise reduces as the distance between the inner surface of the boss and the working flank is increased. The bulk temperature rise is almost inversely proportional to the interval of the heat supply. The size of the heat supply region and the moving direction of the heat source scarcely affect the bulk temperature rise. In |v^^-| not less than 1000, the bulk temperature rise is not affected by the moving velocity of the heat source, and the approximate bulk temperature rise can be obtained by dividing the temperature rise on the working flank due to the stationary heat source by the number of teeth.

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  • Flash Temperature in Spur Gears

    OBATA Fumio, FUJITA Komei, FUJII Masahiro

    Transactions of the Japan Society of Mechanical Engineers. Series C.   52 ( 478 )   1827 - 1832   1986.6

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    Using as a model an isotropic and homogeneous rectangular shaped body, the flash temperature on the working flank of a spur gear tooth was studied. The effects of various factors on the flash temperature were investigated by comparing with the conventional flash temperature on the surface of a semi-infinite body. The results indicate that the maximum flash temperature in the heat supply region has an intimate relation with the product of the size of the heat supply region and the moving velocity of the heat source. In d^^-|v^^-| not less than 10, the maximum flash temperature is determined both by the state of the variation in supplied heat quantity and by the values of d^^-|v^^-| and t^^-/Δt^^- regardless of the state of radiation, the moving direction of the heat source, and the dimensions of the body. A simple equation is proposed which is useful for calculating the maximum flash temperature when the supplied heat quantity varies with time and d^^-|v^^-| is not less than 10.

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  • Temperature Rise of a Spur Gear Tooth Due to Repeated Moving Heat Source

    OBATA F., FUJITA Komei, FUJII Masahiro

    Transactions of the Japan Society of Mechanical Engineers. Series C.   52 ( 476 )   1387 - 1393   1986.4

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    As a basis for the study to clarify the relationship between scoring occurrence and temperature in spur gear pairs, the temperature rise in a rectangular shaped body used as a model of a gear tooth was examined analytically, when a moving heat source with variable heat quantity was supplied repeatedly at regular intervals. The characteristic of the temperature rise of the body and the effect of radiation on the temperature rise were investigated. The temperature rise on the working tooth flank in the heat supply region and its neighborhood can be divided into the flash temperature component not affected by the state of radiation and the bulk temperature rise component significantly affected by it.

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  • Scoring in Spur Clear Pair : 1st Report, Scoring Temperature in Case of Gear Base Oil

    OBATA F., FUJII Komei, FUJITA Masahiro, MATSUO Kohei

    Transactions of the Japan Society of Mechanical Engineers. Series C.   52 ( 473 )   p122 - 129   1986.1

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  • Effects of Load Intensity Fluctuation on Anti-Seizure Copacities of Lubricating Oils : 1st Report, States of Interference among Projections in Case of Gear Base Oil

    OBATA Fumio, FUJITA Komei, FUJII Masahiro

    Transactions of the Japan Society of Mechanical Engineers. Series C.   51 ( 472 )   3259 - 3266   1985.12

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/kikaic.51.3259

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  • Effects of Load Intensity Fluctuation on Anti-Seizure Capacities of Lubricating Oils : 2nd Report, Anti-Seizure Capacity of Gear Base Oil at a High Specific Sliding

    OBATA Fumio, FUJITA Komei, FUJII Masahiro

    Transactions of the Japan Society of Mechanical Engineers. Series C.   51 ( 472 )   3267 - 3274   1985.12

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/kikaic.51.3267

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Presentations

  • Prediction Method of Tightening Characteristic of the Bolted Joints considering Surface Roughness of Parts

    Yukio MOROZUMI, Yuta KOMATSU, Yuya OMIYA, Tadashi SHIOTA, Masahiro FUJII

    2022.9.14 

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    Event date: 2022.9.11 - 2022.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Peeling Characteristics of DLC Deposited on Gear by Filtered Arc Deposition

    Masahiro FUJII, Ryusei IGA, Shinya FUJII, Takehiko OOSHIRO, Yoshikazu TANAKA

    2022.9.14 

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    Event date: 2022.9.10 - 2022.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 歯車の歯面摩擦特性向上と高強度化の話題 Invited

    藤井正浩

    日本機械学会講習会 歯車の高機能化を支える製造技術  2022.7.8 

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    Event date: 2022.7.8

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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  • シロキサン含有ポリイミドコーティングの水潤滑特性に及ぼす硬化温度の影響

    范 月林, 塩田 忠, 大宮祐也, 藤井正浩

    日本設計工学会中国支部研究発表後援会  2022.6.4 

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    Event date: 2022.6.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 第一原理計算によるSi系およびTi系薄膜のAl 2O3基板に対する密着性の評価

    嶋 崎 一真, 竹中優加, 塩田 忠, 大宮祐也, 藤井正浩

    日本設計工学会中国支部研究発表後援会  2022.6.4 

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    Event date: 2022.6.4

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  • 人工股関節嵌合部の耐摩耗性向上を目 指したアルミナージルコニア複合材コー ティング

    塩田忠, 愛原蒼平, 大宮祐也, 藤井正浩

    トライボロジー会議2022 春 東京  2022.5.23 

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    Event date: 2022.5.23 - 2022.5.25

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  • Fretting Wear Properties of Alumina-Zirconia Based Coating Films on Titanium Alloy Substrate

    Sohei AIHARA, Tadashi SHIOTA, Yuya OMIYA, Masahiro FUJI

    2022.3.4 

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    Event date: 2022.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Argon Ion Bombardment Treatment on Adhesive Joint Strength

    Kohei YAMAMOTO, Ryota NAKANISHI, Yuya OMIYA, Tadashi SHIOTA, Masahiro FUJII

    2022.3.4 

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    Event date: 2022.3.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 生理食塩水中における炭化ケイ素コーティングの摩擦摩耗特性

    塩田忠,谷家大樹,竹中優加,大宮祐也,生駒俊之,藤井正浩

    MRM Forum 2020  日本MRS

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    Event date: 2020.12.7 - 2020.12.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Failure mode and fatigue strength of high density sintered alloy gear

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    Event date: 2020.9.13 - 2020.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of substrate roughness on peeling behavior of DLC coated gear

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    Event date: 2020.9.13 - 2020.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Strength Characterization of Adhesive Joint Surface-Modified by Large-Area Eb Irradiation International conference

    Yuya Omiya, Kenji Toyota, Ryota Nakanishi, Akira Okada, Togo Shinonaga, Masahiro Fujii

    The International Conference on Leading Edge Manufacturing/Materials and Processing  ASME

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    Event date: 2020.9.3

    Language:English   Presentation type:Oral presentation (general)  

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  • 水潤滑下におけるステンレス基材上の酸化物コーティング膜のトライボロジー特性

    塩見公,塩田忠,大宮祐也,藤井正浩

    日本設計工学会中国四国支部講演論文集  日本設計工学会中国四国支部

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    Event date: 2020.6.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:広島  

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  • Influence of Compressive Residual Stress Distribution Induced by Peening on Rolling Fatigue of Case-Hardened Steel Roller

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Rolling fatigue strength of induction hardened rollers - Comparison with carburized and hardened rollers -

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Leakage characteristic of pipe flange connection including dispersed axial bolt force

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of surface texturing on adhesive joint strength

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of tightening speed on thread damage in grease lubrication

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effect of tribocharging on the occurrence of low friction state by water-lubricated sliding of silicon carbide

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of laser peening on rolling contact fatigue life of carburized and hardened steel

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    Event date: 2020.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Study on Strength Reliability of Adhesive Joints by Texturing and Surface Modification

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    Event date: 2019.11.2 - 2019.11.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Analyses on Mechanical Behaviour of the Bolted Joints in case of the tightening by 3D FEM

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    Event date: 2019.11.2 - 2019.11.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Mechanical Properties of Amorphous SiC thin films on Al2O3 Ceramic Substrates International conference

    T. Shiota, D. Taniya, M. Okiyama, Y. Takenaka, Y. Omiya, T. Ikoma, M. Fujii

    The 13th Pacific Rim Conference of Ceramic Societies 

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    Event date: 2019.10.27 - 2019.11.1

    Language:English   Presentation type:Poster presentation  

    Venue:沖縄  

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  • Mechanical properties of boron-added liquid phase sintered steel (2nd Report)

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    Event date: 2019.10.22 - 2019.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Tightening Speed on Rapture of Screw Threads International conference

    The 8th International Conference on Manufacturing, Machine Design and Tribology (ICMDT 2019) 

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    Event date: 2019.4.24 - 2019.4.27

    Language:English   Presentation type:Oral presentation (general)  

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  • Tribological behavior of silicon carbide coating films for ceramic-on-ceramic artificial joints International conference

    The 8th International Conference on Manufacturing, Machine Design and Tribology (ICMDT 2019) 

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    Event date: 2019.4.24 - 2019.4.27

    Language:English   Presentation type:Oral presentation (general)  

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  • Friction characteristics of NBR under reciprocating sliding -Influence of durometer hardness-

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    Event date: 2019.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Reinforcement of SBR by Oxidized Nano Carbon Derived from Wood Powder

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    Event date: 2019.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 被締結物がクリープ変形するねじ締結体における軸力低下に及ぼす平座金の効果

    増田大貴,大宮祐也,藤井正浩,玄馬之善,両角由貴夫

    日本機械学会M&M2018材料力学カンファレンス  日本機械学会

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    Event date: 2018.12.22 - 2018.12.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福井  

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  • 被締結物がクリープするねじ締結体の変形解析とボルト軸力低下について

    両角由貴夫,増田大貴,玄馬之善,大宮祐也,藤井正浩

    日本機械学会M&M2018材料力学カンファレンス  日本機械学会

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    Event date: 2018.12.22 - 2018.12.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:福井  

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  • Mechanical properties of boron-added liquid phase sintered steel

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    Event date: 2018.10.30 - 2018.10.31

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effects of the Metal Surface Profile to the Sliding properties between Rubber and Metal and Applying that to Wheel Bearing Seals International conference

    Effects of the Metal Surface Profile to the Sliding properties between Rubber and Metal and Applying that to Wheel Bearing Seals 

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    Event date: 2018.10.14 - 2018.10.17

    Presentation type:Oral presentation (general)  

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  • Degradation of Axial Bolt Force caused by Creep Behavior (Influence of Clamped parts and Female Screw Thread Materials)

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    Event date: 2018.9.9 - 2018.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Durability and fatigue mode of high density sintered gear

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    Event date: 2018.9.9 - 2018.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • DLC膜適用による歯車寿命と疲労強度の改善

    藤井慎也,藤井正浩,竹野清太郎,森口秀樹

    自動車技術会2018年春季大会  2018  自動車技術会

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    Event date: 2018.5.23 - 2018.5.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:横浜  

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  • 締結時におけるRJG付き大口径フランジ締結体のボルト軸力挙動

    大宮祐也,藤井正浩,真鍋和暉,朱 萬玉

    日本機械学会第18回機素潤滑設計部門講演会  2018 

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    Event date: 2018.4.23 - 2018.4.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:山形あわら  

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  • 滑り転がり接触機械要素の表面性状に及ぼすレーザピーニングの影響

    羽原祐也,藤井正浩,影山大恩,野際公宏,三津石大貴,山西利幸

    日本機械学会中国支部第56期総会・講演会  2018  日本機械学会

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    Event date: 2018.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • Leak Rate Variations of Piping Connections with Sealed High Temperature Fluid

    2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 硬度の異なるNBRを用いた油潤滑下における摩擦特性

    宮明直輝,藤井正浩,石田浩規

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • 樹脂の摩擦・摩耗に及ぼす酸化ナノカーボンの形状と濃度の影響

    河元広樹,行好裕介,大宮祐也,藤井正浩,木之下博

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • DLCコーティングした歯車の剥離挙動と面圧強度

    竹野清太郎,藤井正浩,森口秀樹,石塚浩,藤井慎也

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • ブロックオンリングおよび四球摩擦試験を用いた酸化ナノカーボンと他添加剤との併用効果の解明

    西崎僚太,小野秀樹,大宮祐也,藤井正浩,木之下博

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • 潤滑油における酸化ナノカーボンと他添加剤との併用効果 ‐往復動摩擦試験での添加濃度の影響‐

    杉峯健太,中植大介,大宮祐也,藤井正浩,木之下博

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • 異種材料の摩擦撹拌点接合の発熱挙動に及ぼす加圧力及び回転数の影響

    冨岡俊介,大宮祐也,西口勝也,島田聡子,藤井正浩

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • 転動疲労挙動に及ぼす潤滑油への酸化ナノカーボン分散の影響 -表面粗さの変化と寿命への影響-

    竹本和樹,菊地大樹,大宮祐也,藤井正浩,神田信,栃木弘,木之下博

    トライボロジー会議2017秋香川  2017 

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    Event date: 2017.11.15 - 2017.11.18

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川県高松市  

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  • Mechanical behavior of joints with tap bolt subjected to thermal load

    Haruka Yamamoto, Yuya Omiya, Tadatoshi Watanabe, Masahiro Fujii

    自動車技術会2017年秋季大会  2017 

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    Event date: 2017.10.11 - 2017.10.13

    Language:English   Presentation type:Oral presentation (general)  

    Venue:大阪  

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  • 被締結物のクリープによるねじ締結体のボルト軸力低下

    両角由貴夫,藤井正浩,大宮祐也,増田大貴

    日本機械学会2017M&M 材料力学カンファレンス  2017 

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    Event date: 2017.10.7 - 2017.10.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:北海道札幌  

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  • 浸炭硬化鋼の転動疲労寿命に及ぼす空気式ショットピーニングの影響

    關正憲,小林祐次,後和大輔,藤井正浩

    日本機械学会2017年度年次大会  2017 

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    Event date: 2017.9.3 - 2017.9.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ねじ部材用低硬度金属材料のトライボロジー特性

    岡村元気,大宮祐也,藤井正浩,井原朋哉

    日本設計工学会中国支部研究発表講演会  2017 

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    Event date: 2017.6.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Surface durability of carburized hardened roller and gear coated with DLC

    2017 

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    Event date: 2017.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of rubber hardness of NBR on friction characteristics under oil lubrication

    2017 

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    Event date: 2017.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Surface Profile Modified with Fine Shot Peening on Scuffing in Rolling-sliding Contact Element International conference

    Masahiro Fujii, Yuya Omiya, Ryo Ochiai, Koshi Ishimoto, Akihiro Ueda

    The JSME International Conference on Motion and Power Transmissions MPT2017 Kyoto  2017 

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    Event date: 2017.2.28 - 2017.3.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Influence of Density on Fatigue Strength of Sintered and Powder-forged Gears International conference

    Masanori Seki, Masahiro Fujii

    The JSME International Conference on Motion and Power Transmissions MPT2017 Kyoto  2017 

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    Event date: 2017.2.28 - 2017.3.3

    Language:English   Presentation type:Oral presentation (general)  

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  • FEM Analysis on Creep Deformation and Axial Bolt Force Change in Threaded Fasteners at Elevated Temperature International conference

    Yuya OMIYA, Tadatoshi WATANABE, Masahiro FUJII, Haruka YAMAMOTO

    The ASME 2016 International Mechanical Engineering Congress and Exposition  2016 

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    Event date: 2016.11.9 - 2016.11.11

    Language:English   Presentation type:Oral presentation (general)  

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  • 温度変動における小口径管フランジ締結体のボルト軸力変化 International conference

    石堂謙汰,大宮祐也,藤井正浩

    日本機械学会関東支部・精密工学会 山梨講演会2016  2016 

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    Event date: 2016.10.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • トルク法を用いた多数ボルト締結体の締付け挙動

    大宮祐也,藤井正浩

    日本設計工学会2016年度秋季研究発表講演会  2016 

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    Event date: 2016.10.7 - 2016.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Surface Indentation on Rolling Fatigue Behaviour of Steel Roller

    Keiichi Kusahira, Kotaro Kushida

    Mechanical Engineering Congress 2016 Japan  2016 

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    Event date: 2016.9.11 - 2016.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 温度変化を受ける異種材ねじ締結体の変形および応力解析(多数ボルト締結体の場合)

    Mechanical Engineering Congress 2016 Japan  2016 

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    Event date: 2016.9.11 - 2016.9.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Correlation on Scatter between Torque Coefficient and Bolt Preload in Pipe Flange Connection International conference

    Yuya OMIYA, Masahiro FUJII

    ASME 2016 Pressure Vessels and Pipeing Conference  2016 

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    Event date: 2016.7.17 - 2016.7.21

    Language:English   Presentation type:Oral presentation (general)  

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  • 浸炭硬化鋼の転動疲労寿命に及ぼすショットピーニングの影響(ショット粒径0.1mm未満の場合)

    關正憲,張超群,小林祐次,後和大輔,藤井正浩

    日本機械学会第16回機素潤滑設計部門講演会  2016 

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    Event date: 2016.4.18 - 2016.4.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 浸炭硬化鋼の転動疲労寿命に及ぼすレーザーピーニングの影響

    藤井正浩,安倍慎一郎,羽原祐也,小林祐次,辻俊哉,Bovid Stan,關正憲

    日本機械学会第16回機素潤滑設計部門講演会  2016 

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    Event date: 2016.4.18 - 2016.4.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction and wear behavior of thermal-sprayed cermet coatings under water lubrication

    2016 

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    Event date: 2016.3.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of surface condition on friction and wear of silicon carbide under oil lubrication -result with surfaces pre-slid in water-

    2016 

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    Event date: 2016.3.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Rolling contact fatigue life of steel roller with indentation marks on contact surface

    2016 

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    Event date: 2016.3.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Rolling fatigue life of carburized steel treated by laser peening

    2016 

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    Event date: 2016.3.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 木材由来ナノ潤滑添加剤の潤滑油への分散および摩擦特性

    小野秀樹,杉峯健太,木之下博,藤井正浩,仁科勇太

    第5回酸化グラフェンシンポジウム  2015 

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    Event date: 2015.12.11 - 2015.12.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 木材由来ナノ潤滑添加剤散水の摩擦特性

    金森康平,木之下博,藤井正浩,仁科勇太

    第5回酸化グラフェンシンポジウム  2015 

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    Event date: 2015.12.11 - 2015.12.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 高圧力作用下における金属ガスケット単体の密封性能試験および応力解析

    柴井裕太,大宮祐也,藤井正浩

    日本機械学会M&M2015 材料力学カンファレンス  2015 

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    Event date: 2015.11.21 - 2015.11.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ボルト初期締め付け力のばらつきが管フランジ締結体の微小漏えいに及ぼす影響

    大宮祐也,板野光司,藤井正浩

    日本機械学会関東支部・精密工学会 山梨講演会2015  2015 

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ねじのはめあい長さがボルト締結体のねじ部における応力分布に及ぼす影響

    田村直樹,大宮祐也,藤井正浩

    日本機械学会関東支部・精密工学会 山梨講演会2015  2015 

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • トルク法による管フランジ締結体のボルト初期締め付け力とトルク係数のばらつき

    大宮祐也,板野光司,藤井正浩,芳井大治

    日本機械学会関東支部・精密工学会 山梨講演会2015  2015 

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    Event date: 2015.10.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • The influence of various sliding pairs on the tribology of graphene oxide water dispersions International conference

    Hideki ONO, Hiroshi KINOSHITA, Yuta NISHINA, Aidil Azli ALIAS, Masahiro FUJII

    International Tribology Conference 2015 Tokyo  2015 

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    Event date: 2015.9.17 - 2015.9.20

    Language:English   Presentation type:Poster presentation  

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  • Evaluation of the tribological behavior of graphene oxide sheet in oil lubricants International conference

    Masahiro KONDO, Hiroshi KINOSHITA, Masahiro FUJII

    International Tribology Conference 2015 Tokyo  2015 

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    Event date: 2015.9.17 - 2015.9.20

    Language:English   Presentation type:Poster presentation  

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  • 温度変化を受ける異種材ボルト締結体の変形および応力解析

    両角由貴夫,大宮祐也,藤井正浩

    日本機械学会2015年度年次大会  2015 

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    Event date: 2015.9.13

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:札幌  

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  • Effect of Surface Properties on Fatigue Life of Cavitation-Peened Steel Roller

    2015 

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A Design Method of Tightening Torque Based on Amount of Leakage for Pipe Flange Connection Taking Account of Bolt Preload Scatter

    2015 

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of artificial surface defects on rolling contact fatigue of heat-treated steel roller

    2015 

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction and Wear Behavior of Sprayed Coatings under Water Lubrication

    2015 

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    Event date: 2015.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Dispersing graphene oxide to various fluids and their tribological properties

    2014 

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    Event date: 2014.5.19 - 2014.5.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Surface Durability of Spur Gear Carburized and Quenched after Grinding

    The JSME Symposium on Motion and Power Transmissions 2013  2013 

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    Event date: 2013.11.14 - 2013.11.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Tooth Surface Form on Fatigue Strength of Case-Hardened Steel Gears

    The JSME Symposium on Motion and Power Transmissions 2013  2013 

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    Event date: 2013.11.14 - 2013.11.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • CNT含有複合めっきの合成とその微小荷重領域における電気抵抗

    横井悠馬, 木之下博, 藤井正浩

    日本機械学会2013年度年次大会  2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • The Effect of Friction Reduction by Water Dispersed Graphene Oxide - influence of Sliding Materials -

    2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Synthesis of carbon nanotube -plating composites and measurements of their contact resistances under micro loads

    2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Synthesis and tribological property of high density nanodiamond-electroless nickel plating composite

    2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction decrease effect of various materials in water dispersions of nanodiamond

    2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Improvement in rolling Contact Fatigue Life of Bearing Steel by Shot Peening with Shot Diameter of 0.05 mm

    2013 

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    Event date: 2013.9.8 - 2013.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Tribological properties of sandfish skink's scale under micro loads from the view point of Biomimetics

    2013 

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    Event date: 2013.5.20 - 2013.5.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Advantages of graphene oxide as lubricant additives -effects in water lubrication-

    2013 

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    Event date: 2013.5.20 - 2013.5.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction force reduction of carbon nanotube films by modulation - mechanism of the friction force reduction -

    2013 

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    Event date: 2013.5.20 - 2013.5.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction Reducing Properties of Graphene Oxide and Nano Diamond Additives in Water Lubrication

    2013 

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    Event date: 2013.5.20 - 2013.5.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 炭素系材料を含んだ無電解ニッケルめっき複合膜の開発

    大嶋隆史, 田口明徳, 木之下博, 藤井正浩

    日本機械学会中国四国支部第51期総会・講演会  2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Surface Property Changes during Fatigue Process of Peened Case-Hardened Steel Rollers

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction reducing method on carbon nanotube films by normal oscillation -Load dependence under micro newton loads-

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Development of Electroless Nickel Plating Composition Film including Carbon Based Materials

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effect of Surface Property on Pitting Strength of Case-Hardened Steel Gears

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Rolling Fatigue Behavior of Steel Roller with Surface Defects

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Effects of Surface Feature on Friction Characteristic of Viscoelastic Material

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Wear Life of Solid Lubricant under High Temperature up to 873K

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Rolling Contact Fatigue Life of Bearing Steel Treated by Shot Peening with Shot Diameter of 0.05 mm

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Investigations of Micro Tribological Mechanisms in Biological Scales for Biomimetics

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Tribological Evaluation of Hard Coatings under Water Lubrication

    2013 

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    Event date: 2013.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Performance Evaluation of Differential Rotary to Linear Conversion Mechanism with Ball Screws and Spur Gears International conference

    Masanori Seki, Yoshiki Ototake, Takafumi Matsui, Ichiro Shimizu, Masahiro Fujii

    The 2nd IFToMM Asian Conference on Mechanism and Machine Science  2012 

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    Event date: 2012.11.7 - 2012.11.10

    Presentation type:Oral presentation (general)  

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  • 鋼の摺動特性に及ぼすショットピーニングの影響

    關正憲,二田誠一郎,小林祐次,杉浦英明,藤井正浩

    トライボロジー会議2012秋  2012 

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    Event date: 2012.9.16 - 2012.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 振動印加によるカーボンナノチューブ薄膜の摩擦低減?ミリニュートン荷重領域における効果?

    木之下博,横井悠馬,蔭山正敏,アイディルアズリエイリアス,藤井正浩

    トライボロジー会議2012秋 

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    Event date: 2012.9.16 - 2012.9.18

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 歯面への異物かみ込み状態の弾塑性解析

    藤井正浩,乾龍馬

    日本機械学会2012年度年次大会  2012 

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    Event date: 2012.9.9 - 2012.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 同一表面粗さにおける浸炭硬化ローラの疲労寿命に及ぼすキャビテーションピーニングとショットピーニングの影響

    關正憲,祖山均,小林祐次,杉浦英明,藤井正浩

    日本機械学会2012年度年次大会  2012 

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    Event date: 2012.9.9 - 2012.9.12

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 振動印加によるカーボンナノチューブ薄膜の摩擦係数の0から1以上までのコントロール

    木之下博、蔭山正敏、アイディルアズリエイリアス、藤井正浩

    ナノ学会第10 回大会  2012 

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    Event date: 2012.6.14 - 2012.6.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 差動型回転直動変換機構による重量物の位置決め精度と位置保持性能

    關正憲,乙武慶樹,松井崇史,清水一郎,藤井正浩

    The 2012 JSME Conference on Robotics and Mechatronics  2012 

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    Event date: 2012.5.27 - 2012.5.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • キャビテーションピーニングとショットピーニングを施した同一表面粗さにおける浸炭硬化ローラの疲労強度

    關正憲,祖山均,小林祐次,後和大輔,藤井正浩

    平成24 年度ショットピーニング技術協会学術講演会  2012 

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    Event date: 2012.5.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • サンドフィッシュの鱗のマイクロニュートン荷重領域における凝着および摩擦特性

    政安亮祐,山田光太郎,木之下博,藤井正浩

    トライボロジー会議2012春  2012 

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    Event date: 2012.5.14 - 2012.5.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • カーボンナノチューブ薄膜のマイクロニュートン荷重領域における振動印加による摩擦低減効果?振動周波数と振幅依存性?

    蔭山正敏,アイディルアズリエイリアス,木之下博,藤井正浩

    トライボロジー会議2012春 

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    Event date: 2012.5.14 - 2012.5.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Friction Force Reduction on Carbon Nanotube (CNT) Films by Oscillating Motions under Micronewton Loads - Oscillation Frequency Dependence -

    Aidil Azlibin Alias, Masatoshi Kageyama, Hiroshi Kinoshita,Masahiro Fujii

    2012 

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    Event date: 2012.4.23 - 2012.4.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 焼結および粉末鍛造歯車の疲労強度に及ぼす密度の影響

    關正憲,藤井正浩,吉田彰

    日本機械学会第12 回機素潤滑設計部門講演会  2012 

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    Event date: 2012.4.23 - 2012.4.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ミリニュートン荷重下におけるカーボンナノチューブ薄膜とベアリング球とのトライボロジー

    大嶋隆史,戸田幸介,木之下博,藤井正浩

    日本機械学会第12 回機素潤滑設計部門講演会  2012 

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    Event date: 2012.4.23 - 2012.4.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 差動型回転直動変換機構を用いた重量物の位置決めに関する研究

    關正憲,乙武慶樹,松崎敦史,清水一郎,藤井正浩

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 片当りを伴う鋼ローラの弾塑性解析

    藤井正浩,三葉康伸,乾龍馬

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • プラズマCVD 法によるDLC 被膜の真空無潤滑下における摩擦摩耗挙動

    藤井正浩,福田拓哉,Kumar M. Ananth ,金山祥生

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • クラウニング歯面を有する浸炭硬化歯車の疲労寿命

    關正憲,野田大輔,西岡真吾,藤井正浩

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

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  • キャビテーションピーニングによる鋼歯車の加工硬化と疲労寿命の関係

    關正憲,角田将光,祖山均,内藤暁馬,藤井正浩

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 水潤滑下におけるDLC膜の摩擦・摩耗挙動

    藤井正浩,藤原大輔,板野光司

    日本機械学会中国四国支部第50期総会・講演会  2012 

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    Event date: 2012.3.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Low Temperature Formation Process and Low Load Electrical Contact of a Carbon Nanotube Film Bonded to a Au Film International conference

    Hiroshi Kinoshita, Naganori Koda, Masanori Seki, Masahiro Fujii, Yoshitada Isono, Nobuo Ohmae

    International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)  2011 

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    Event date: 2011.10.30 - 2011.11.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Rolling Contact Fatigue Evaluation of Shot-Peened Case-Hardened Steel with a Thrust Washer Testing Machine and a Roller Testing Machine International conference

    Masanori Seki, Lei Wang, Yasuharu Nagai, Yuji Kobayashi, Daisuke Gowa, Hiroshi Kinoshita, Masahiro Fujii

    International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)  2011 

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    Event date: 2011.10.30 - 2011.11.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Effect of Coating Thickness and Environment on The Tribology of Thick DLC Coating under Sliding Contact International conference

    M. Ananth Kumar and Masahiro Fujii

    International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)  2011 

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    Event date: 2011.10.30 - 2011.11.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Frictional Properties of Carbon Nanotube Films with a Load Range from Micronewton to Millinewton Using mm Size Balls International conference

    Takashi Nakayama, Hiroshi Kinoshita, Takahiro Sumitani, Kazuya Takeshita, Masanori Seki, Masahiro Fujii, Nobuo Ohmae

    International Tribology Conference Hiroshima 2011(ITC Hiroshima 2011)  2011 

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    Event date: 2011.10.30 - 2011.11.3

    Language:English   Presentation type:Oral presentation (general)  

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  • Rolling Contact Fatigue Life of Case-Hardened Steel Treated by Shot Peenings with Shot Diameters of 0.05 mm and 0.30 mm International conference

    Lei Wang, Guangliang Liu, Masanori Seki, Masahiro Fujii, Qian Li

    International Conference on Power Transmissions 2011  2011 

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    Event date: 2011.10.25 - 2011.10.29

    Language:English   Presentation type:Oral presentation (general)  

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  • Rolling Contact Fatigue Life of Steel Rollers Treated by Cavitation Peening and Shot Peening International conference

    Masanori Seki, Hitoshi Soyama, Yuji Kobayashi, Daisuke Gowa, Masahiro Fujii

    International Conference on Advanced Technology in Experimental Mechanics 2011(ATEM'11)  2011 

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    Event date: 2011.9.19 - 2011.9.21

    Language:English   Presentation type:Oral presentation (general)  

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  • 超熱酸素原子ビーム照射によるナノ粗さカーボン系材料表面での超親水性の実現

    木之下博,中山隆史,松本直浩,藤井正浩,大前伸夫

    ナノ学会第9回大会  2011 

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    Event date: 2011.6.2 - 2011.6.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 差動型回転直動変換機構の位置決め精度と入出力特性

    關正憲,清水一郎,松井崇史,乙武慶樹,藤井正浩

    日本機械学会ロボティクス・メカトロニクス講演会2011(ROBOMECH2011)  2011 

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    Event date: 2011.5.26 - 2011.5.28

    Language:Japanese   Presentation type:Poster presentation  

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  • Fatigue Strength of Steel Rollers and Gears Treated by Cavitation Peening with Short Processing Time (A Case of Processing Time of 1 minute and 5 minutes) International conference

    Masanori Seki, Naruto Nishie, Seiya Kozai, Masamitsu Kakuda, Hitoshi Soyama, Akima Naito, Masahiro Fujii

    The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)  2011 

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    Event date: 2011.4.24 - 2011.4.27

    Language:English   Presentation type:Oral presentation (general)  

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  • Performance Comparison of Differential Rotary to Linear Conversion Mechanisms with Multiple Ball Screws and Gears International conference

    Yoshiki Ototake, Masanori Seki, Ichiro Shimizu, Takafumi Matsui, Masahiro Fujii

    The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)  2011 

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    Event date: 2011.4.24 - 2011.4.27

    Language:English   Presentation type:Oral presentation (general)  

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  • Rolling Contact Fatigue of Thermal Refining Steel Roller with a Hardness of HV 285-380 International conference

    Masahiro Fujii, Yasunobu Miwa, Masafumi Aoba, Noritada Fujimura, Kenzo Miura

    The 4th International Conference on Manufacturing, Machine Design and Tribology (ICMDT2011)  2011 

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    Event date: 2011.4.24 - 2011.4.27

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  • ピーニング処理した鋼表面の形状的特徴と摩擦摩耗特性の関係

    關 正憲,菅野真司,二田誠一郎,藤井正浩

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

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  • 鋼ローラの転がり疲れ強さ・摩擦係数・表面粗さに及ぼす極圧添加剤の影響

    藤井正浩,松本 武,真鍋義隆,佐伯 親

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 耐熱合金に施した固体潤滑剤の873Kまでの高温環境下における摩擦摩耗

    藤井正浩,酒井正俊

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 油潤滑下におけるNBRの摩擦評価

    藤井正浩,吉井雄生

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 歯面研削を施した表面粗さの異なる鋼歯車のピッチング強さ

    關 正憲,嘉本 潤,藤井正浩,木村幸彦,堀本雅之,牧野泰三

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 浸炭硬化鋼の転動疲労寿命に及ぼす各種ショットピーニングの影響

    關 正憲,王 磊,小林祐次,後和大輔,藤井正浩

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 複数のボールねじと歯車で構成される差動型回転直動変換機構の基本性能比較

    關 正憲,清水一郎,松井崇史,乙武慶樹,藤井正浩

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • キャビテーションピーニングを施した鋼ローラの疲れ寿命(ショットピーニングを施した鋼ローラとの比較)

    關 正憲,香西聖也,祖山 均,内藤暁馬,藤井正浩

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 微粒子ピーニングを施した浸炭硬化ローラの疲れ寿命

    關 正憲,小林祐次,後和大輔,長井康晴,藤井正浩

    日本機械学会中国四国支部第49期総会・講演会  2011 

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    Event date: 2011.3.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A study of tribological characteristics of plasma CVD DLC coatings in sliding contact under oil lubrication International conference

    Tribology Congress in Australia (ASIATRIB2010)  2010 

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    Event date: 2010.12.5 - 2010.12.9

    Language:English   Presentation type:Oral presentation (general)  

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  • Fundamental Characteristics of Reverse-Type Differential Rotary to Linear Conversion Mechanism International conference

    The 2nd International Conference on Design Engineering and Science (ICDES2010)  2010 

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    Event date: 2010.11.17 - 2010.11.19

    Language:English   Presentation type:Oral presentation (general)  

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  • Influence of Substrate Roughness and Thickness of DLC Coating on Tribological Behaviour in Vacuum under Sliding Contact International conference

    The 2nd International Conference on Design Engineering and Science (ICDES2010)  2010 

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    Event date: 2010.11.17 - 2010.11.19

    Language:English   Presentation type:Oral presentation (general)  

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  • Friction, wear and surface durability of tungsten carbide/ carbon-coated gear and roller International conference

    International Conference on Gears  2010 

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    Event date: 2010.10.4 - 2010.10.6

    Language:English   Presentation type:Oral presentation (general)  

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  • ボールねじと歯車で構成される新たな差動回転直動変換機構の基礎的特性評価

    關 正憲,清水一郎,藤井正浩,松井崇史

    日本機械学会2010年度年次大会  2010 

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    Event date: 2010.9.6 - 2010.9.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 微粒子ピーニングを施した浸炭硬化鋼の転動疲労寿命

    王 磊,關 正憲,小林祐次,藤井正浩

    日本設計工学会 平成22年度研究発表講演会  2010 

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    Event date: 2010.6.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • キャビテーションピーニングによる鋼の摺動特性の向上

    關 正憲,祖山 均,藤井正浩,吉田 彰

    日本材料学会 第59期学術講演会  2010 

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    Event date: 2010.5.22 - 2010.5.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 低摩擦高硬度被膜の動力伝達機械要素への応用

    藤井正浩

    広島市産業振興センター材料・設計技術融合研究会  2010 

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    Event date: 2010.3.26

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 油潤滑下における硬質皮膜のトライボロジー特性に及ぼす皮膜厚さの影響

    藤井正浩,關 正憲,二田誠一郎,深井譲二,吉田 彰

    日本機械学会中国四国支部 第48期総会・講演会  2010 

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    Event date: 2010.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 調質鋼されたクロムモリブデン鋼製ローラの転がり疲れ

    藤井正浩,中尾幸司,青葉雅文,藤村徳忠,三浦健藏

    日本機械学会中国四国支部 第48期総会・講演会  2010 

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    Event date: 2010.3.6

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  • 鋼歯車の疲労寿命向上とキャビテーションピーニングによる硬さの増加の関係

    關 正憲,祖山 均,藤井正浩,西江徳人,角田将光,吉田 彰

    日本機械学会中国四国支部 第48期総会・講演会  2010 

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    Event date: 2010.3.6

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  • HV350程度の調質鋼製ローラの面圧強度

    藤井正浩,青葉雅文,藤村徳忠,三浦健藏

    日本機械学会第10回機素潤滑設計部門講演会  2010 

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    Event date: 2010.3.6

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  • DLCコーティングのはく離寿命に及ぼす膜厚の影響

    藤井正浩,村田紘一,深井譲二,白川貴人,吉田彰

    日本機械学会中国四国支部 第48期総会・講演会  2010 

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    Event date: 2010.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 歯車材料と熱処理法,高強度化法

    藤井正浩

    日本機械学会講習会歯車技術基礎講座  2009 

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    Event date: 2009.11.19 - 2009.11.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 環境負荷低減を目指した機械要素のトライボロジー特性の向上

    藤井正浩,關 正憲

    岡山大学知恵の見本市2009  2009 

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    Event date: 2009.11.6

    Language:Japanese   Presentation type:Poster presentation  

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  • 環境負荷低減のための脱油圧を実現する機械式リニアアクチュエータの開発

    清水一郎,關 正憲,多田直哉,藤井正浩

    岡山大学知恵の見本市2009  2009 

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    Event date: 2009.11.6

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  • D値と硬さを考慮したピッチング寿命と面圧強さの評価

    吉田 彰,關 正憲,藤井正浩,福原健人

    日本設計工学会 平成21年度秋季研究発表講演会  2009 

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    Event date: 2009.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 高出力と高精度位置決めを両立させる機械式リニアアクチュエータの開発

    松井崇史,關 正憲,清水一郎,藤井正浩,吉田 彰

    日本設計工学会 平成21年度秋季研究発表講演会  2009 

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    Event date: 2009.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ピーニングされた表面の摩擦・摩耗特性(S45C焼入れ材の場合)

    二田誠一郎,藤井正浩,關 正憲,祖山 均,小林祐次,吉田 彰

    日本設計工学会 平成21年度秋季研究発表講演会  2009 

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    Event date: 2009.10.24

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 鋼ローラに施したDLCおよびWC/C被膜の摩擦・摩耗挙動

    藤井正浩

    日本機械学会九州支部・中国四国支部合同企画長崎講演会  2009 

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    Event date: 2009.10.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 浸炭硬化鋼に施したWC/C膜のスクラッチ試験による摩擦特性評価

    藤井正浩,關 正憲,吉田 彰

    日本機械学会 2009年度年次大会  2009 

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    Event date: 2009.9.13 - 2009.9.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Influence of Automotive Gear Oil on Rolling Fatigue Strength of Steel Roller International conference

    Yoshitaka Manabe, Shin Saeki, Masahiro Fujii, Akira Yoshida

    World Tribology Congress 2009  2009 

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    Event date: 2009.9.6 - 2009.9.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Effect of Cavitation Peening on Tribological Characteristics of Carbon Steel International conference

    Masanori Seki, Masahiro Fujii, Hitoshi Soyama, Akira Yoshida

    World Tribology Congress 2009  2009 

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    Event date: 2009.9.6 - 2009.9.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Influence of Thickness of DLC Coating on Tribological Characteristics under Sliding-Rolling Contact Condition International conference

    Masahiro Fujii, M.Ananth Kumar, Akira Yoshida

    World Tribology Congress 2009  2009 

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    Event date: 2009.9.6 - 2009.9.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Surface Durability of WC/C Coated Case-Hardened Steel Gear International conference

    Masahiro Fujii, Masanori Seki, Akira Yoshida

    The 3rd International Conference on Manufacturing, Machine Design and Tribology (ICMDT2009)  2009 

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    Event date: 2009.6.25 - 2009.6.26

    Language:English   Presentation type:Oral presentation (general)  

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  • Surface Durability of Powder-Forged Roller Treated by Shot Peening International conference

    Masanori Seki, Masahiro Fujii, Yuji Kobayashi, Masaaki Sato, Akira Yoshida

    The 3rd International Conference on Manufacturing, Machine Design and Tribology (ICMDT2009)  2009 

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    Event date: 2009.6.25 - 2009.6.26

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  • 鋼歯車の疲れ強さに及ぼす歯面研削の有無の影響

    藤井正浩,關 正憲,鎌谷 豊

    日本設計工学会中国支部 平成21年度研究発表講演会  2009 

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    Event date: 2009.6.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 粉末焼結ローラの面圧強さに及ぼすショットピーニングの影響

    關 正憲,藤井正浩,小林祐次,佐藤正昭,吉田 彰

    ショットピーニング技術協会 第18回学術講演会  2009 

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    Event date: 2009.5.28

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Improvement in Fatigue Strength of Steel Gear by Next-Generation Cavitation Peening International conference

    Masanori Seki, Hitoshi Soyama, Akira Yoshida

    The JSME International Conference on Motion and Power Transmissions (MPT2009)  2009 

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    Event date: 2009.5.13 - 2009.5.15

    Language:English   Presentation type:Oral presentation (general)  

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  • Influence of Base Oil Viscosity, Viscosity Index Improver, and Additives of Lubricating Oil on Rolling Contact Fatigue Strength of Steel Roller International conference

    Masahiro Fujii, Yoshitaka Manabe, Shin Saeki, Akira Yoshida

    The JSME International Conference on Motion and Power Transmissions (MPT2009)  2009 

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    Event date: 2009.5.13 - 2009.5.15

    Language:English   Presentation type:Oral presentation (general)  

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  • 873Kまでの高温環境下における固体潤滑剤の摩擦特性

    藤井正浩,鴉 頌孝

    日本機械学会中国四国支部 第47期総会・講演会  2009 

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    Event date: 2009.3.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • キャビテーションピーニングを施した鋼ローラの表面性状とピッチング強さ

    關 正憲,祖山 均,藤井正浩,藤井 勲,香山勇人,西澤一登,関根裕一,吉田 彰

    日本機械学会中国四国支部 第47期総会・講演会  2009 

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    Event date: 2009.3.6

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  • WC/C膜を施した浸炭硬化歯車のピッチング強さ

    關 正憲,藤井正浩,安田 群,山口博幸,吉田 彰

    日本機械学会中国四国支部 第47期総会・講演会  2009 

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    Event date: 2009.3.6

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  • Friction and Wear of Plasma CVD Diamond-Like Carbon Coating Deposited on Gear and Roller International conference

    *Masahiro Fujii, Akira Yoshida

    The First Conference of Energy Engineering ICEE-1  2008 

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    Event date: 2008.12.28 - 2008.12.31

    Presentation type:Oral presentation (general)  

    Venue:エジプト,アスワン  

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  • 水中および気中キャビテーション噴流による浸炭硬化歯車の疲れ寿命向上

    關 正憲,祖山 均,*藤井正浩,飛田芳希,西江徳人,西澤一登,吉田 彰

    日本機械学会中国四国支部・九州支部合同企画岡山講演会  2008 

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    Event date: 2008.10.22

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 鋼の摺動特性に及ぼすピーニングの影響

    *藤井正浩,關 正憲,周 丹華,二田誠一郎

    日本機械学会中国四国支部・九州支部合同企画岡山講演会  2008 

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    Event date: 2008.10.22

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Effect of Cavitation Shotless Peening on Fatigue Strength of Steel Gear International conference

    Masanori Seki, Hitoshi Soyama, *Masahiro Fujii, Akira Yoshida

    The 10th International Conference on Shot Peening  2008 

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    Event date: 2008.9.15 - 2008.9.18

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • キャビテーション・ショットレス・ピーニングを施した鋼材の摺動特性に関する基礎的研究

    關 正憲,祖山 均,*藤井正浩,吉田 彰

    ショットピーニング技術協会第17 回学術講演会  2008 

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    Event date: 2008.5.26

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 鋼歯車の疲れ寿命向上に対するキャビテーションピーニングの応用

    關 正憲,祖山 均,*藤井正浩,吉田 彰

    日本材料学会第57期学術講演会  2008 

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    Event date: 2008.5.24 - 2008.5.25

    Presentation type:Oral presentation (general)  

    Venue:熊本  

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  • ショットピーニングを施した粉末焼結ローラの面圧強さ

    關 正憲,*藤井正浩,佐藤正昭,小林祐次,吉永克仁,吉田 彰

    日本機械学会第8回機素潤滑設計部門講演会  2008 

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    Event date: 2008.4.21 - 2008.4.22

    Presentation type:Oral presentation (general)  

    Venue:倉敷市  

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  • キャビテーションピーニングを施した鋼歯車の面圧強さ

    關 正憲,祖山 均,*藤井正浩,飛田芳希,西江徳人,吉田 彰

    日本機械学会第8回機素潤滑設計部門講演会  2008 

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    Event date: 2008.4.21 - 2008.4.22

    Presentation type:Oral presentation (general)  

    Venue:倉敷市  

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  • An Analysis of Failure in Thin Coatings Subjected to Contact Loading

    S. Rash Ahmadi,*M. Fujii,M. Shakeri,A. Sadough,T. Shirakawa

    日本機械学会第8回機素潤滑設計部門講演会  2008 

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    Event date: 2008.4.21 - 2008.4.22

    Presentation type:Oral presentation (general)  

    Venue:倉敷市  

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  • DLC 膜の摩擦・摩耗特性評価のための一解析

    *藤井正浩,白川貴人,Samrand Rash Ahmadi,吉田 彰

    日本機械学会中国四国支部第46 期総会・講演会  2008 

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    Event date: 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:東広島市  

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  • 鋼ローラの疲れ寿命に及ぼすキャビテーションピーニングの影響

    關 正憲,祖山 均,*藤井正浩,三嶋孝洋,藤井 勲,吉田 彰

    日本機械学会中国四国支部第46 期総会・講演会  2008 

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    Event date: 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:東広島市  

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  • 粘度特性の異なる潤滑油を用いた場合の転がり疲れ強さの評価

    *藤井正浩,佐伯琢也,真鍋義隆,佐伯 親,吉田 彰

    日本機械学会中国四国支部第46 期総会・講演会  2008 

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    Event date: 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:東広島市  

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  • 油潤滑下におけるDLC膜の摩擦・摩耗に及ぼす膜厚の影響

    *藤井正浩,深井譲二,吉田 彰

    日本機械学会中国四国支部第46 期総会・講演会  2008 

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    Event date: 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:東広島市  

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  • 鋼歯車の疲れ寿命に及ぼすキャビテーションピーニングの影響

    關 正憲,祖山 均,*藤井正浩,殿河内哲也,飛田芳希,吉田 彰

    日本機械学会中国四国支部第46 期総会・講演会  2008 

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    Event date: 2008.3.7

    Presentation type:Oral presentation (general)  

    Venue:東広島市  

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  • トライボ機械要素の表面強度の向上と評価技術の開発

    *藤井正浩,關正憲

    岡山大学 知恵の見本市2007  2007 

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    Event date: 2007.12.7

    Presentation type:Poster presentation  

    Venue:岡山  

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  • 鋼ローラの転がり疲れ強さに及ぼす潤滑油粘度特性の影響

    *藤井正浩,佐伯琢也,真鍋義隆,佐伯 親,吉田 彰

    日本機械学会機素潤滑設計部門MPT2007シンポジウム<伝動装置>  2007 

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    Event date: 2007.11.29 - 2007.12.1

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • キャビテーション・ショットレス・ピーニングによる鋼歯車の疲れ強さ向上

    關 正憲,祖山 均,*藤井正浩,吉田 彰

    日本機械学会機素潤滑設計部門MPT2007シンポジウム<伝動装置>  2007 

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    Event date: 2007.11.29 - 2007.12.1

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • 鋼ローラの転がり疲れ強さに及ぼす模擬欠陥の影響

    *藤井正浩,水野泰英,吉田 彰

    日本機械学会機素潤滑設計部門MPT2007シンポジウム<伝動装置>  2007 

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    Event date: 2007.11.29 - 2007.12.1

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • シングルショットピーニングとダブルショットピーニングを施した鋼ローラの面圧強さ

    關 正憲,小林祐次,*藤井正浩,藤田浩司,吉田 彰

    日本機械学会機素潤滑設計部門MPT2007シンポジウム<伝動装置>  2007 

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    Event date: 2007.11.29 - 2007.12.1

    Presentation type:Oral presentation (general)  

    Venue:鳥取  

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  • Education and Tribology Research in Graduate School of Natural Science and Technology (Dept. of Mechanical Engineering) in Okayama University International conference

    *藤井正浩

    西安交通大学招待講演  2007 

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    Event date: 2007.11.21 - 2007.11.22

    Presentation type:Oral presentation (general)  

    Venue:西安,中国  

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  • キャビテーション・ショットレス・ピーニングを施した鋼歯車の疲れ寿命

    關正憲,祖山均,*藤井正浩,吉田彰

    トライボロジー会議 2007 秋 佐賀  2007 

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    Event date: 2007.9.26 - 2007.9.28

    Presentation type:Oral presentation (general)  

    Venue:佐賀  

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  • A Comparison of Rolling Contact Fatigue of Steel Roller under Traction Oil Lubrication and under Turbine Oil Lubrication International conference

    *Masahiro Fujii, Akira Yoshida, Yasuhide mizuno, Kento fukuhara, Kiyoji Minegishi

    International Conference Machine Design and Tribology ICMDT2007  2007 

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    Event date: 2007.7.1 - 2007.7.3

    Presentation type:Oral presentation (general)  

    Venue:Sapporo, Japan  

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  • トラクション油潤滑下における鋼ローラの表面き裂発生位置に関する一考察

    *藤井正浩,關 正憲,福原健人,吉田 彰

    日本設計工学会中国支部平成19 年度研究発表講演会  2007 

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    Event date: 2007.6.9

    Presentation type:Oral presentation (general)  

    Venue:広島  

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  • 粉末鍛造ローラの面圧強さに及ぼすショットピーニングの影響

    關正憲,岩本直之,佐藤正昭,小林祐次,*藤井正浩,吉田彰

    ショットピーニング技術協会第16回学術講演会  2007 

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    Event date: 2007.5.21

    Presentation type:Oral presentation (general)  

    Venue:東京  

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  • An Investigation into Solidification and Mechanical Properties Behavior of AL-Si Casting Alloy International conference

    G.T.Abdel-Jaber, A.M.Omran, Khalil Abdelrazek Khalil, *Masahiro Fujii, Masanori Seki, Akira Yoshida

    ASIAN Foundry Congress 2007  2007 

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    Event date: 2007.5.8 - 2007.5.10

    Presentation type:Oral presentation (general)  

    Venue:Seoul, Korea  

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  • トラクション油潤滑下における鋼ローラの表面損傷

    *藤井正浩,水野泰英,長尾和也,吉田彰

    日本機械学会中国四国支部第45期総会・講演会  2007 

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    Event date: 2007.3.7

    Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • トラクション係数に及ぼす鋼ローラのクラウニング半径の影響

    *藤井正浩,長尾和也,水野泰英,吉田彰

    日本機械学会中国四国支部第45期総会・講演会  2007 

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    Event date: 2007.3.7

    Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 浸炭硬化歯車の疲れ寿命に及ぼすWC/Cコーティングの影響

    關正憲,*藤井正浩,山口博幸,吉田彰

    日本機械学会中国四国支部第45期総会・講演会  2007 

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    Event date: 2007.3.7

    Presentation type:Oral presentation (general)  

    Venue:徳島  

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  • 高精度・高性能機械要素設計のための解析技術の適用と評価

    *藤井正浩,吉田彰,關正憲

    平成18年度特別電源所在県科学技術振興事業研究成果発表会  2007 

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    Event date: 2007.3.2

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • 国際会議報告「International Tribology Conference AUSTRIB2006 」

    *藤井正浩

    日本機械学会中国四国機素潤滑設計技術研究会第41 回  2007 

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    Event date: 2007.1.19

    Presentation type:Oral presentation (general)  

    Venue:岡山  

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  • Static Characteristics of Aerostatic Guide Made of Partially Porous Ceramics

    *Masahiro Fujii, Akira Yoshida, Sijian Liu, Hisao Nagashio, Masahiro Yoshikawa

    International Tribology Conference AUSTRIB2006  2006 

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    Event date: 2006.12.3 - 2006.12.6

    Venue:Australia, Brisbane  

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  • 特殊環境下のトライボ性能

    *藤井正浩

    日本機械学会中国四国支部第100回講習会「機械の伝動性能とトライボロジー」  2006 

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    Event date: 2006.11.13

    Venue:岡山  

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  • Rolling Contact Fatigue Characteristics of Newly Developed bearing Steel Ball and Washer at a Temperature Range of 313 K to 403 K

    Hiroshi Osaki, Ryousuke Ano, Akira Yoshida, *Masahiro Fujii

    The 3rd International Conference on Tribology, ASIATRIB 2006 KANAZAWA  2006 

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    Event date: 2006.10.16 - 2006.10.19

    Venue:金沢  

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  • プラズマCVDにより形成したDLC膜の摩擦・摩耗

    *藤井正浩,吉田 彰,小笠原央士,花田敏久

    日本機械学会2006年度年次大会  2006 

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    Event date: 2006.9.18 - 2006.9.22

    Venue:熊本  

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  • トラクション油潤滑下における鋼ローラの転がり疲れ

    *藤井正浩,吉田 彰,Bayasgalan Seesregdorj,長尾和也,峯岸清次,為永 淳

    日本機械学会 第6回機素潤滑設計部門講演会  2006 

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    Event date: 2006.5.29 - 2006.5.30

    Venue:松島  

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  • DLC膜の高真空中摩擦・摩耗に及ぼす膜厚の影響

    *藤井正浩,吉田 彰,小笠原央士

    日本機械学会中国四国支部 第44期総会・講演会  2006 

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    Event date: 2006.3.8

    Venue:東広島  

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  • 新軸受鋼製スラスト軸受の転がり疲れ強さ

    大崎浩志,阿野亮介,藤井正浩*,吉田 彰,近藤俊行

    日本機械学会中国四国支部 第44期総会・講演会  2006 

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    Event date: 2006.3.8

    Venue:東広島  

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  • 平歯車および円筒に形成したDLC膜の高真空中摩擦・摩耗

    *藤井正浩,吉田 彰,花田敏久

    日本機械学会中国四国支部 第44期総会・講演会  2006 

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    Event date: 2006.3.8

    Venue:東広島  

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  • Si, Moを添加した新軸受鋼製球の転がり疲労特性

    大崎浩志,阿野亮介,吉田 彰,*藤井正浩,大上祐司,近藤俊行

    トライボロジー会議2005秋東京  2005 

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    Event date: 2005.11.16 - 2005.11.18

    Venue:東京  

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  • Si, Moを添加した新軸受鋼製球の準高温転がり疲労特性

    阿野亮介,大崎浩志,吉田 彰,*藤井正浩,大上祐司,近藤俊行

    トライボロジー会議2005秋東京  2005 

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    Event date: 2005.11.16 - 2005.11.18

    Venue:東京  

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  • 国際会議報告「VDI2005 International Conference on Gears」

    *藤井正浩

    日本機械学会機素潤滑設計部門 中国四国機素潤滑設計技術研究会  2005 

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    Event date: 2005.9.30

    Venue:岡山  

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  • Influence of Crowning on Rolling Contact Fatigue of Steel Rollers

    *Masahiro Fujii, Akira Yoshida, Seesregdorj BAYASGALAN, Kiyoji Minegishi, Jun Tamenaga

    VDI International Conference on Gears 2005  2005 

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    Event date: 2005.9.14 - 2005.9.16

    Venue:Munich, Germany  

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  • アルミナセラミックス溶射皮膜の転がり疲れ

    *藤井正浩

    日本機械学会機素潤滑設計部門 中国四国機素潤滑設計技術研究会  2005 

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    Event date: 2005.7.1

    Venue:広島  

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  • Transmission Efficiency and Non-contacting Torque of Spur Gear Pair Working Magnetic Repulsion between Teeth Flanks

    T. Harano, A. Yoshida, *M. Fujii, D. Miyamoto, Y. Iwasa

    International Conference on Manufacturing, Machine Design and Tribology ICMDT2005  2005 

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    Event date: 2005.6.23 - 2005.6.24

    Venue:Seoul, Korea  

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  • Influence of Sprayed Layer Thickness on Rolling Contact Fatigue of Thermal Sprayed Roller

    *Masahiro Fujii, Akira Yoshida, Jun Ishimaru, Jibian Ma,Shigeto Shigemura,Kazumi Tani

    International Conference on Manufacturing, Machine Design and Tribology ICMDT2005  2005 

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    Event date: 2005.6.23 - 2005.6.24

    Venue:Seoul, Korea  

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  • 鋼ローラの転がり疲れに及ぼすエッジロードの影響

    *藤井正浩,吉田 彰,Seesregdorj BAYASGALAN,濱田健司,峯岸清次,為永 淳

    日本設計工学会 中国支部講演会  2005 

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    Event date: 2005.6.11

    Venue:広島  

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  • セラミックス溶射ローラの転がり疲れに及ぼす溶射皮膜厚さと下地溶射の影響

    *藤井正浩,吉田 彰,馬 加彬,石丸 純,重村貞人,谷 和美

    日本設計工学会 中国支部講演会  2005 

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    Event date: 2005.6.11

    Venue:広島  

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  • Friction and Wear of Stainless Steel with Dispersed Self-Lubricating Precipitations

    *Masahiro Fujii, Akira Yoshida, Kenzo Miura

    International Tribology Conference KOBE 2005  2005 

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    Event date: 2005.5.29 - 2005.6.2

    Venue:神戸  

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  • アルミナセラミックス溶射ローラの転がり疲れに及ぼす溶射皮膜厚さの影響

    *藤井正浩,吉田 彰,馬 加彬,石丸 純,重村貞人,谷 和美

    日本機械学会中国四国支部 第43期総会・講演会  2005 

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    Event date: 2005.3.8

    Venue:松山  

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  • 多孔質ファインセラミックス製静圧空気ガイドの圧力分布の測定と解析

    *藤井正浩,吉田 彰,劉 思健,正田圭一,永塩久翁,吉川正博

    日本機械学会中国四国支部 第43期総会・講演会  2005 

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    Event date: 2005.3.8

    Venue:松山  

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  • 粒子分散複合めっきローラの摩擦・摩耗

    *藤井正浩,吉田 彰,石丸 純

    日本機械学会機素潤滑設計部門MPT2004シンポジウム<伝動装置>  2004 

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    Event date: 2004.11.27

    Venue:大阪  

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  • SUJ2 製ローラの転がり疲れに及ぼすクラウニングの影響

    *藤井正浩,吉田 彰,濱田健司,Seesregdorj BAYASGALAN,峯岸清次,為永 淳

    日本機械学会機素潤滑設計部門MPT2004シンポジウム<伝動装置>  2004 

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    Event date: 2004.11.27

    Venue:大阪  

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  • 多孔質ファインセラミックスの静圧空気ガイドへの適用(第1報:静剛性の評価)

    *藤井正浩,吉田 彰,劉 思健,正田圭一,永塩久翁,吉川正博

    日本トライボロジー学会トライボロジー会議2004 秋鳥取  2004 

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    Event date: 2004.11.12

    Venue:鳥取  

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  • 多孔質ファインセラミックスの静圧空気ガイドへの適用(第2報:表面処理による絞り効果)

    劉 思健,*藤井正浩,吉田 彰,正田圭一,永塩久翁,吉川正博

    日本トライボロジー学会トライボロジー会議2004 秋鳥取  2004 

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    Event date: 2004.11.12

    Venue:鳥取  

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  • 析出物分散によるステンレス鋼の摩擦・摩耗特性の改善

    *藤井正浩,吉田 彰,三浦健藏

    日本機械学会2004 年度年次大会  2004 

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    Event date: 2004.9.8

    Venue:札幌  

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  • Rolling Contact Fatigue Strength and Young's Modulus of Plasma Sprayed Alumina Coating

    Kazumi TANI, Sadato SHIGEMURA, *Masahiro FUJII, Akira YOSHIDA

    International Thermal Spray Conference ITSC2004  2004 

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    Event date: 2004.5.10 - 2004.5.12

    Venue:大阪  

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  • 耐摩耗性ステンレス鋼の摩擦・摩耗特性(油潤滑下および真空中の結果)

    *藤井正浩,吉田 彰,織田英哲,三浦健藏

    日本機械学会中国四国支部第42 期総会・講演会  2004 

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    Event date: 2004.3.6

    Venue:広島  

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  • 鋼ローラの転がり疲れに及ぼすクラウニングの影響(接触応力解析)

    *藤井正浩,吉田 彰,田渕貴仁,峯岸清次,為永 淳

    日本機械学会中国四国支部第42 期総会・講演会  2004 

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    Event date: 2004.3.6

    Venue:広島  

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  • DLC 膜の真空高温摩擦・摩耗

    *藤井正浩,吉田 彰,嶋津由臣

    日本機械学会中国四国支部第42 期総会・講演会  2004 

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    Event date: 2004.3.6

    Venue:広島  

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  • アルミナ溶射皮膜の転動疲労強さ

    谷 和美,重村貞人,吉田 彰,*藤井正浩

    高温学会・溶射部会大12回溶射総合討論会  2003 

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    Event date: 2003.11.13 - 2003.11.14

    Venue:盛岡  

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  • セラミックス溶射鋼ローラの純転がり接触における転がり疲れ

    *藤井正浩,吉田 彰,重村貞人,谷 和美,幸 賢司

    日本トライボロジー学会トライボロジー会議新潟  2003 

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    Event date: 2003.11.11 - 2003.11.13

    Venue:新潟  

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  • スパイラルベベルギヤ冷間鍛造のためのトライボロジー

    吉田 彰,三島 進,*藤井正浩,關 正憲

    日本設計工学会平成15年度秋季研究発表講演会  2003 

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    Event date: 2003.9.19

    Venue:大阪  

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  • Friction and Wear of Surface Modified Stainless Steel Gears and Rollers in High Vacuum

    *Masahiro FUJII, Akira Yoshida and Tomoki Harano

    2003 ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference Chicago  2003 

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    Event date: 2003.9.2 - 2003.9.6

    Venue:Chicago,USA  

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  • Snめっき熱拡散処理されたステンレス鋼の真空高温摩擦・摩耗

    *藤井正浩,吉田 彰,嶋津良臣

    日本機械学会2003年度年次大会  2003 

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    Event date: 2003.8.5 - 2003.8.8

    Venue:徳島  

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  • 無電解Ni基合金めっきの油潤滑下における摩擦・摩耗

    *藤井正浩,吉田 彰,織田英哲

    日本機械学会2003年度年次大会  2003 

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    Event date: 2003.8.5 - 2003.8.8

    Venue:徳島  

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  • 多孔質ファインセラミックスを用いた静圧ガイドに関する基礎的研究

    *藤井正浩,吉田 彰,劉 思健,永塩久翁,吉川正博

    日本機械学会2003年度年次大会  2003 

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    Event date: 2003.8.5 - 2003.8.8

    Venue:徳島  

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  • アルミナセラミックス溶射ローラの転がり疲れ

    *藤井正浩,吉田 彰,幸 賢司,重村貞人,谷 和美

    日本機械学会中国四国支部第41期総会・講演会  2003 

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    Event date: 2003.3.6

    Venue:鳥取  

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  • 無電解複合めっきローラの摩擦・摩耗に及ぼす分散粒子の影響

    *藤井正浩,吉田 彰,森田雄一

    日本機械学会中国四国支部第41期総会・講演会  2003 

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    Event date: 2003.3.6

    Venue:鳥取  

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  • ヘルツ接触下における表面改質層の応力分布

    吉田 彰,*藤井正浩,原野智哉

    日本機械学会中国四国支部・九州支部合同企画松山地方講演会  2002 

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    Event date: 2002.10.19

    Venue:松山  

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  • 多孔質ファインセラミックス製静圧ガイドに関する基礎的研究

    吉田 彰,*藤井正浩,劉 思健

    日本設計工学会中国支部講演会  2002 

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    Event date: 2002.6.15

    Venue:広島  

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  • 冷間鍛造金型の摩擦挙動に関する基礎的研究

    三島 進,吉田 彰,*藤井正浩,関 正憲,幸 賢司

    日本設計工学会中国支部講演会  2002 

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    Event date: 2002.6.15

    Venue:広島  

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  • 粒子分散複合めっきの真空中トライボ性能

    *藤井正浩,吉田 彰

    日本機械学会第2回機素潤滑設計部門講演会  2002 

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    Event date: 2002.4.22 - 2002.4.23

    Venue:長崎  

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  • Tribological Performance of Electroless Ni Alloy Plated Stainless Steel Gears in High Vacuum

    Akira Yoshida, *Masahiro Fujii, Tomoki Harano

    International Conference on Gears  2002 

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    Event date: 2002.3.13 - 2002.3.15

    Venue:Munich, Germany  

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  • 耐摩耗性ステンレス鋼の摩擦・摩耗特性

    吉田 彰,*藤井正浩,小林 寛,三浦健蔵

    日本機械学会中国四国支部第40期総会・講演会  2002 

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    Event date: 2002.3.5

    Venue:東広島  

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  • 複合表面改質皮膜の摩擦・摩耗特性

    吉田 彰,*藤井正浩,岡内 健

    日本機械学会中国四国支部第40期総会・講演会  2002 

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    Event date: 2002.3.5

    Venue:東広島  

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  • 高真空下における表面改質歯車の歯面摩耗評価

    吉田 彰,*藤井正浩,原野智哉,布野靖明

    日本機械学会中国四国支部第40期総会・講演会  2002 

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    Event date: 2002.3.5

    Venue:東広島  

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  • Effect of Surface Modified Layer on Rolling Fatigue Strength

    Akira Yoshida, *Masahiro Fujii

    JSME International Conference on Motion and Power Transmissions MPT2001-Fukuoka  2001 

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    Event date: 2001.11.15 - 2001.11.17

    Venue:福岡  

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  • 粒子分散複合めっき層の強度に及ぼす分散粒子径の影響について

    *藤井正浩

    中国四国機素潤滑設計技術研究会  2001 

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    Event date: 2001.11.9

    Venue:岡山  

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  • Ni系めっき表面の真空・高温摩擦摩耗特性

    吉田 彰,*藤井正浩,岡内 健

    日本設計工学会平成13年度秋季研究発表講演会  2001 

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    Event date: 2001.9.29

    Venue:岡山  

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  • Study of Optimum Disperased Particle Size for Wear of Multiplex Plated Surfaces

    Akira Yoshida, *Masahiro Fujii, R S Dwyer-Joyce

    2nd World Tribology Congress WTC2001  2001 

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    Event date: 2001.9.3 - 2001.9.7

    Venue:Viena, Austria  

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  • 粒子分散複合めっき層の強度に及ぼす粒子の影響に関する解析的研究

    吉田 彰,*藤井正浩,上路嘉隆

    日本機械学会中国四国支部第39期総会・講演会  2001 

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    Event date: 2001.3.6

    Venue:岡山  

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  • 耐摩耗性ステンレス鋼の焼付きおよび摩耗特性

    吉田 彰,*藤井正浩,堀口清司

    日本機械学会中国四国支部第39期総会・講演会  2001 

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    Event date: 2001.3.6

    Venue:岡山  

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  • フラクタル次元による改質表面の摩耗過程の評価

    吉田 彰,*藤井正浩,柳井寛之輔

    日本機械学会中国四国支部第39期総会・講演会  2001 

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    Event date: 2001.3.6

    Venue:岡山  

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  • Influence of Surface Modification on Rolling Contact Fatigue Strength

    *Masahiro Fujii

    Tribology at Twelve, University of Sheffield  2001 

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    Event date: 2001.2.2

    Venue:Sheffield, UK  

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  • Tribological Behaviors of Multiplex Plated Stainless Steel Rollers in High Vacuum

    Akira Yoshida, *Masahiro Fujii, Tomoki Harano

    International Tribology Conference NAGASAKI 2000  2000 

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    Event date: 2000.10.29 - 2000.11.2

    Venue:長崎  

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  • 摩耗表面の評価へのフラクタル次元の適用に関する研究

    吉田 彰,*藤井正浩,柳井寛之輔

    日本機械学会中国四国支部・九州支部合同企画徳島地方講演会  2000 

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    Event date: 2000.10.28

    Venue:徳島  

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  • Scuffing Characteristics of Wear Resisting Steel and Steel with Surface Modification Treatment

    Kenzo Miura, Testuo Komada, Akira Yoshida, *Masahiro Fujii

    6th International Symposium on Marine Engineering TOKYO 2000 (ISME2000)  2000 

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    Event date: 2000.10.23 - 2000.10.27

    Venue:東京  

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  • 表面改質歯車の高真空中摩耗評価に関する研究

    吉田 彰,*藤井正浩,原野智哉,布野靖明

    日本設計工学会平成12年度秋季研究発表講演会  2000 

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    Event date: 2000.9.30

    Venue:福岡  

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  • 改質表面の真空高温摩擦・摩耗

    吉田 彰,*藤井正浩,岡内 健,赤木康宏

    日本設計工学会中国支部講演会  2000 

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    Event date: 2000.6.17

    Venue:広島  

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  • 高真空平歯車試験におけるNi系合金を母相とする無電解めっきの摩擦摩耗

    吉田 彰,*藤井正浩,原野智哉,大前勝禎

    日本機械学会中国四国支部第38期総会・講演会  2000 

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    Event date: 2000.3.7

    Venue:東広島  

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  • 航空用摺動材料の高温トライボロジー

    吉田 彰,*藤井正浩,赤木康宏,本多康洋,長澤和毅,階戸秀雄,半田正樹

    日本機械学会第7回機械材料・材料加工技術講演会講演論文集  1999 

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    Event date: 1999.11.5

    Venue:東広島  

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  • 航空宇宙用材料の真空高温摩擦・摩耗特性

    吉田 彰,*藤井正浩,赤木康宏,本多康洋,長澤和毅,階戸秀雄,半田正樹

    トライボロジー会議 ’99 秋 高松  1999 

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    Event date: 1999.10.27 - 1999.10.29

    Venue:高松  

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  • 二円筒試験による粒子分散めっきの高真空中摩擦・摩耗評価

    吉田 彰,*藤井正浩,原野智哉

    トライボロジー会議 ’99 秋 高松  1999 

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    Event date: 1999.10.27 - 1999.10.29

    Venue:高松  

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  • Tribological Characteristics of α-Sialon and Al2O3 at High Temperature

    Akira Yoshida, *Masahiro Fujii

    International Conference on Advanced Technology in Ex-perimental Mechanics ’99  1999 

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    Event date: 1999.7.21 - 1999.7.24

    Venue:宇部  

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  • Tribological Behaviors of Surface Modified Spur Gears in High Vacuum

    Akira Yoshida, *Masahiro Fujii, Tomoki Harano

    Tenth World Congress on the Theory of Machines and Mechanisms  1999 

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    Event date: 1999.6.20 - 1999.6.24

    Venue:Oulu, Finland  

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  • 転がり疲れに及ぼすATF性状の影響

    吉田 彰,*藤井正浩,柳井寛之輔,松尾浩平

    日本設計工学会中国支部講演会  1999 

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    Event date: 1999.6.5

    Venue:広島  

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  • P-version FEM Model as a Possible Powerful Calculation Method of TEHD Problems

    Szabolcs Szaval,*藤井正浩,吉田 彰

    日本機械学会中国四国支部第37期総会・講演会  1999 

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    Event date: 1999.3.8

    Venue:宇部  

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  • 粒子分散Ni-P合金めっきローラの摩擦・摩耗(高真空試験の場合)

    吉田 彰,*藤井正浩,原野智哉,南條貴律

    日本機械学会中国四国支部第37期総会・講演会  1999 

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    Event date: 1999.3.8

    Venue:宇部  

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  • 金属平型ガスケット表面の微細観察に基づく微小漏えいメカニズムの考察

    林 大雅, 大宮 祐也, 塩田 忠, 藤井 正浩

    トライボロジー会議2021 秋 松江  2021.10.28 

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  • 炭化ケイ素コーティングによる生理食塩水中の摩擦特性の向上

    塩田 忠, 谷家 大樹, 竹中 優加, 石井 良助, 大宮 祐也, 藤井 正浩

    トライボロジー会議2021 秋 松江  2021.10.27 

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  • 原子層堆積法によるアルミナ薄膜コーティングがステンレス製ねじの摩擦特性に及ぼす影響

    山内 恒輝, 大宮 祐也, 両角 由貴夫, 塩田 忠, 藤井 正浩

    日本機械学会2021年度年次大会  2021.9.8 

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  • はめ合い状態がねじ込みボルト締結体のばね定 数に及ぼす影響

    大宮 祐也, 塩田 忠, 藤井 正浩

    日本機械学会2021年度年次大会  2021.9.8 

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  • 浸炭硬化鋼ローラの面圧疲労強度に及ぼすピーニングで付与した圧縮残留応力の影響

    藤井 一輝, 藤井 正浩, 栗原 拓也, 一宮 克行

    日本機械学会2021年度年次大会  2021.9.8 

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  • 粘弾性材料の摩擦特性に及ぼすディンプルの影響

    中村 浩大, 藤井 正浩, 大宮 祐也, 石井 清剛

    日本機械学会2021年度年次大会  2021.9.8 

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  • Siを含む有機無機ハイブリッド膜の水中での摩擦摩耗特性

    塩田 忠, 山本剛史, 塩見 公, 大宮祐也, 藤井 正浩

    トライボロジー会議2021 春 東京  2021.5.25 

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  • レーザピーニングで施したディンプルが摩擦特性に及ぼす影響

    河渕 紗英子, 藤井 正浩, 塩田 忠, 大宮 祐也

    日本機械学会中国四国支部第59期総会・講演会  2021.3.5 

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  • ステンレス鋼基板上に製膜されたシリカコーティング膜の水中トライボロジー特性

    塩見 公, 塩田 忠, 大宮 祐也, 藤井 正浩

    日本機械学会中国四国支部第59期総会・講演会  2021.3.5 

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  • 回転角締め付け挙動に及ぼす表面粗さの影響

    玄馬 之善, 大竹 遼平, 両角 由貴夫, 大宮 祐也, 塩田 忠, 藤井 正浩

    日本機械学会中国四国支部第59期総会・講演会  2021.3.5 

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  • 各種ホウ化物硬質コーティング膜の乾燥摩擦摩耗特性

    梁 瑞和, 塩田 忠, 大宮 祐也, 藤井 正浩

    日本機械学会中国四国支部第59期総会・講演会  2021.3.5 

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  • 木材由来ナノカーボン材料のゴムへの応用とその機械特性

    彭 履安, 大宮 祐也, 塩田 忠, 藤井 正浩

    日本機械学会中国四国支部第59期総会・講演会  2021.3.5 

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  • Influence of rubber hardness of NBR on friction characteristics under oil lubrication

    2017 

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  • Surface durability of carburized hardened roller and gear coated with DLC

    2017 

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  • 高温流体を密封した配管接合部の漏えい量変化

    トライボロジー会議2017秋香川  2017 

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  • 接触表面に圧痕を有する鋼ローラの転がり疲れ

    日本機械学会中国四国支部第54期総会・講演会  2016 

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  • Influence of Surface Indentation on Rolling Fatigue Behaviour of Steel Roller

    Mechanical Engineering Congress 2016 Japan  2016 

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  • Rolling fatigue life of carburized steel treated by laser peening

    2016 

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  • Friction and wear behavior of thermal-sprayed cermet coatings under water lubrication

    2016 

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  • 炭化ケイ素の油中摩擦摩耗に及ぼす表面状態の影響 -水中で予備摺動された表面による結果-

    日本機械学会中国四国支部第54期総会・講演会  2016 

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  • 管フランジ締結体におけるボルト初期軸力のばらつきを考慮した漏えい量基準の締付トルク設計法

    日本機械学会中国四国支部第53期総会・講演会  2015 

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  • Effect of Surface Properties on Fatigue Life of Cavitation-Peened Steel Roller

    2015 

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  • Influence of artificial surface defects on rolling contact fatigue of heat-treated steel roller

    2015 

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  • Friction and Wear Behavior of Sprayed Coatings under Water Lubrication

    2015 

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  • The influence of various sliding pairs on the tribology of graphene oxide water dispersions

    International Tribology Conference 2015 Tokyo  2015 

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  • Evaluation of the tribological behavior of graphene oxide sheet in oil lubricants

    International Tribology Conference 2015 Tokyo  2015 

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  • 酸化グラフェンの各種液体への分散とそれらのトライボロジー特性

    トライボロジー会議2014春東京  2014 

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  • Wear Life of Solid Lubricant under High Temperature up to 873K

    2013 

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  • Investigations of Micro Tribological Mechanisms in Biological Scales for Biomimetics

    2013 

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  • Tribological Evaluation of Hard Coatings under Water Lubrication

    2013 

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  • Rolling Contact Fatigue Life of Bearing Steel Treated by Shot Peening with Shot Diameter of 0.05 mm

    2013 

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  • Effect of Surface Property on Pitting Strength of Case-Hardened Steel Gears

    2013 

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  • Rolling Fatigue Behavior of Steel Roller with Surface Defects

    2013 

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  • Synthesis and tribological property of high density nanodiamond-electroless nickel plating composite

    2013 

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  • Friction decrease effect of various materials in water dispersions of nanodiamond

    2013 

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  • Surface Durability of Spur Gear Carburized and Quenched after Grinding

    The JSME Symposium on Motion and Power Transmissions 2013  2013 

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  • Improvement in rolling Contact Fatigue Life of Bearing Steel by Shot Peening with Shot Diameter of 0.05 mm

    2013 

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  • ピーニングを施した浸炭硬化ローラの疲労過程における表面性状の変化

    日本機械学会中国四国支部第51期総会・講演会  2013 

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  • カーボンナノ材料を含んだ無電解ニッケルめっき複合膜の開発

    日本機械学会中国四国支部第51期総会・講演会  2013 

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  • 酸化グラフェンの摩擦添加剤としての効果 -水潤滑における効果-

    トライボロジー会議2013秋福岡  2013 

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  • 微小振動印加によるカーボンナノチューブ薄膜の摩擦低減 -摩擦低減メカニズム-

    トライボロジー会議2013春  2013 

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  • カーボンナノチューブ薄膜の振動入力による摩擦低減法 -マイクロニュートン荷重における荷重依存性-

    日本機械学会中国四国支部第51期総会・講演会  2013 

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  • 酸化グラフェンおよびナノダイヤモンドの水潤滑での添加による摩擦減少特性

    トライボロジー会議2013春  2013 

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  • バイオミメティクスの観点からのサンドフィッシュの鱗の微小荷重領域でのトライボロジー特性

    トライボロジー会議2013春  2013 

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  • 酸化グラフェン分散水による摩擦減少効果 -摺動材料による影響-

    日本機械学会2013年度年次大会  2013 

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  • カーボンナノチューブ含有複合めっきの合成と微小荷重領域における接触電気抵抗測定

    日本機械学会2013年度年次大会  2013 

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  • 浸炭硬化歯車の疲労強度に及ぼす歯面形状の影響

    MPT2013シンポジウム<伝動装置>  2013 

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  • Effects of Surface Feature on Friction Characteristic of Viscoelastic Material

    2013 

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  • 振動印加によるカーボンナノチューブ薄膜の摩擦低減-ミリニュートン荷重領域における効果-

    トライボロジー会議2012秋  2012 

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  • Friction Force Reduction on Carbon Nanotube (CNT) Films by Oscillating Motions under Micronewton Loads - Oscillation Frequency Dependence -

    2012 

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  • Performance Evaluation of Differential Rotary to Linear Conversion Mechanism with Ball Screws and Spur Gears

    The 2nd IFToMM Asian Conference on Mechanism and Machine Science  2012 

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  • カーボンナノチューブ薄膜のマイクロニュートン荷重領域における振動印加による摩擦低減効果-振動周波数と振幅依存性-

    トライボロジー会議2012春  2012 

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  • 低摩擦高硬度被膜の動力伝達機械要素への応用

    材料・設計技術融合研究会  2010 

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Awards

  • 日本機械学会フェロー

    2018  

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    Country:Japan

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  • 日本機械学会表彰

    2017  

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Research Projects

  • Development of nano-coating film using laser peening and evaluation of tribo performance

    Grant number:21K03837  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    藤井 正浩

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

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  • トラクションドライブの疲労強度シミュレーションの開発と高精度高信頼性設計の実現

    Grant number:18H01357  2018.04 - 2021.03

    日本学術振興会  科学研究費助成事業 基盤研究(B)  基盤研究(B)

    成田 幸仁, 藤井 正浩, 風間 俊治, 増山 知也, 長船 康裕

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    Grant amount:\17940000 ( Direct expense: \13800000 、 Indirect expense:\4140000 )

    油膜のせん断力で動力を伝達するトラクションドライブの転がり疲労強度とそのばらつきを予測するシミュレーション手法を提案することを目的とする.今年度の前半は,転がり疲労強度シミュレーションプログラムを作成し,その計算結果を前年度に得られた実験結果と比較した.
    前年度の多数個の転がり疲労試験結果から,ローラの転がり疲労強度を律するのは転がり方向に平行に働くせん断応力であると仮定した.また,ローラの表面硬さと材料中の介在物寸法をパラメータとした転がり疲労強度予測式も得られた.これらの結果を利用して,ある押付力とトラクション力下でのローラの内部せん断応力を計算し,その値と転がり疲労強度とを比較して損傷を判断するシミュレーションプログラムを製作した.実際の鋼材中の介在物寸法分布を与えたローラをコンピュータ上に再現し,それらに対してシミュレーションを行ったところ転がり疲労強度の標準偏差は昨年度の実験結果と一致した.しかし,転がり疲労強度自体は実験結果の方が300MPaほど高かった.浸炭焼入れによって導入されるローラ表面の残留圧縮応力が転がり疲労強度を向上させている可能性が高いため,実際の試験ローラ表面を電解研磨しつつ残留圧縮応力を測定した.その結果,ローラ表面から0.8mm程度の深さまで,約100MPa程度の圧縮残留応力が存在していることが判明した.
    今年度の後半からは,転がり疲労強度シミュレーションの汎用性の確認に取り掛かった.近年,介在物の小径化が図られた清浄鋼が普及し始めている.そこで,清浄鋼を用いてローラ試験片を製作した.その介在物寸法分布を昨年度に導入したデジタルマイクロスコープで観察したところ,密度と介在物寸法の両方が,これまでの試験ローラの半分程度であることが分かった.現在,新しい清浄鋼ローラを用いて,多数個の疲労試験を行っているところである.

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  • Creation of contact surface that achieves both durability and lubricity by laser-assisted modification

    Grant number:17K06120  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    FUJII Masahiro

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    A laser peening without shots could achieve compressive residual stress and increase in surface hardness while suppressing increase in surface roughness on the tribo-element surface. The purpose of this study was to create an excellent surface with high durability and high lubricity with the same surface modification. Using a YAG laser oscillator, a peening device that synchronously controlled the motorized stages and the laser oscillation was manufactured, and the effect of laser peening on the surface durability was investigated using a test specimen assuming a high strength tribo-element. In addition, the surface was dimple-shaped by laser peening, and the influence of the peening condition and the peening pattern on the frictional characteristics was investigated. Then the results were found to be the basis of the surface creation technology that achieves both improved durability and lubricity.

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  • Inhibition of fatigue fractures using graphene oxide as innovative lubricant additive

    Grant number:15K13858  2015.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    KINOSHITA HIROSHI, FUJII Masahiro, NISHINA Yuta

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    Grant amount:\3900000 ( Direct expense: \3000000 、 Indirect expense:\900000 )

    In order to prevent fatigue fractures by repeated stress, hardness of contact materials have been increased. However it is not sufficient. In this study, we carried out to improve fatigue life using dispersing graphene oxide in lubricating oil. Dispersion methods of graphene oxide in lubricating oil and rolling tester with minimum lubricating oils were developed. Improvement of fatigue life was achieved by the dispersing graphene oxide in the lubricating oil. However, formation of tribofilm which seems to greatly improve fatigue life was not achieved. In the future, in order to achieve further improvement of fatigue life, we will discover dispersants that will improve formation of tribofilms.

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  • In-situ measurement of effect of hyperthermal atomic oxygen exposure on tribological property of ionic liquids

    Grant number:25630036  2013.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research  Grant-in-Aid for Challenging Exploratory Research

    FUJII Masahiro, KINOSHITA Hiroshi

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    Grant amount:\3640000 ( Direct expense: \2800000 、 Indirect expense:\840000 )

    Recently, since ionic liquids have very low vapor pressure, chemical stability, and proper viscosity, ionic liquids are expected to use lubricated liquids in space facilities. In low Earth orbit, polymer and carbon materials are intensely eroded by hyperthermal atomic oxygen exposure. However, effect of hyperthermal atomic oxygen exposure on tribological property of ionic liquids are unknown. In this study, the effect was investigated using a laser-plasma type hyperthermal atomic oxygen facility. The experimental findings suggested that the tribological property of ionic liquids was not changed by exposure of hyperthermal atomic oxygen with 2.5e20 atoms/cm2.

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  • Evaluation and Verification of Surface Durability of Power Transmission Triboelement Concerning of Micro-and Macro-Configuration

    Grant number:17360073  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    YOSHIDA Akira, FUJII Asahiro, SEKI Masanori, OHUE Yuji

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    Grant amount:\10200000 ( Direct expense: \10200000 )

    Light weight, compact, high-strength, high-reliability and so on have been required to machines, therefore highly reliable evaluation and verification as well as improvement of surface durability is one of the most important subjects. In this study three dimensional contact stress analyses was conducted in considering of both macro-configuration such as crowning and micro-configuration such as asperity, hardness, and residual stress distributions, and the surface failure and durability were evaluated. The surface failure and durability were also examined and evaluated with rollers and gear pairs with various micro and macro surface configurations.
    As to surface macro-configuration, the influence of crowning on surface durability and traction performance was investigated. In case that no edge load or minor edge load occurred, the rolling contact fatigue strength evaluated with the normal load increased with increasing crowning radius. On the contrary, the traction performance increased with decreasing crowning radius. It was clarified that the optimal crowning, where both the high rolling contact fatigue strength and the traction performance were combined, exists and the importance of the crowning design of the power transmission tribomachine elements.
    As to micro-configuration, hardness distribution, residual stress distribution, and surface roughness of rollers and gear pairs with shot-peening, double shot-peening, and some other treatments such as cavitation shotless peening were measured. The amplitude of the ratio of the stress to the hardness obtained by the contact analyses in consideration of hardness distribution and residual stress distribution measured would be suitable for evaluation of the surface durability and the fatigue life.

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  • DEVELOPMENT OF AEROSTATIC GUIDE WITH HIGH STIFFNESS AND HIGH PERFORMANCE MADE OF PARTIALLY POROUS FINE CERAMICS

    Grant number:16560120  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    FUJII Masahiro

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    Grant amount:\3200000 ( Direct expense: \3200000 )

    While both friction and wear are small in an aerostatic guide, the stiffness is comparatively small. Porous materials are used as a restrictor to improve stiffness in an aerostatic guide. In this study a partially porous ceramics, which was made with a special manufacturing process, was applied to the aerostatic guide. The boundary between the porous part and the fine part of the ceramics was seamless, and the porosity and the pore size were able to be controlled flexibly. The fundamental static characteristics of the aerostatic guide made of the partially porous ceramics were evaluated. In addition electroless plating was treated onto the porous ceramics surface for the purpose of obtaining high static stiffness, and the effect of plating on the static stiffness was examined. In addition the deflection of ceramics would occur by the pressurized air. The influence of deflection of porous ceramics on static characteristics was also evaluated. The obtained results were as follows : 1.Even in case of the non-plated ceramics, the maximum dimensionless static stiffness was enough to be used for the aerostatic guide. In case of the plated ceramics both the flow rate and the clearance decreased. Consequently, the high stiffness was obtained by the plating. 2.The minimum clearance where the maximum dimensionless static stiffness was obtained varied little with the deflection of porous ceramics. Therefore, the minimum clearance was suitable as the representative clearance. 3.The maximum dimensionless static stiffness and the load capacity estimated with the minimum clearance were decreased by the deflection of the porous ceramics. 4.The maximum dimensionless static stiffness and the load capacity could be arranged in order with the ratio of the deflection to the apparent clearance. 5.The partially porous ceramics employed in this study would be able to be applied to aerostatic guides.

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  • Research on High Performance Surface Modified Layer with Dispersed Fine Particles

    Grant number:14550126  2002 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    FUJII Masahiro

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    Grant amount:\3500000 ( Direct expense: \3500000 )

    In order to improve the tribological performance of surface modified layer, dispersed particles, dispersed precipitations and ceramics particles spraying were investigated.
    1. Roller and ring/disk tests were carried out under non-lubricating condition in high vacuum to investigate the tribological performance of particle dispersed composite platings. The influence of elastic modulus of dispersed particles on stresses was investigated with FEM analysis. The maximum values of Von Mises stress in the plated layer increased with increasing particle content and with decreasing elastic modulus of particles. The wear behavior obtained in the experiment could be well explained by the calculated stress field.
    2. The rolling contact fatigue of a sprayed alumina ceramics was studied with a two-roller test apparatus with oil lubricant. The subsurface shear stresses were calculated with two-dimensional FEM analyses. The maximum values of orthogonal shear stress and maximum shear stress occurred within the sprayed layer. The depths of observed subsurface cracks were generally deeper than those of the maxima of shear stresses.
    3. The friction and wear characteristics of stainless steel with dispersed precipitations were investigated with ring-on-disk test apparatuses under oil lubricating condition and non-lubricating condition in air and in vacuum. The friction and wear performances of stainless steel were improved by dispersed precipitations.
    4. A gear test and a two-cylinder test were carried out under non-lubricating condition in high vacuum. In case of the Ni-P plated gear with dispersed PTFE particles, the wear was almost uniform along the tooth profile and the fluctuation of the dynamic load was small. Though the wear in the two-cylinder test was much smaller than that in the gear test, there is a good correlation of the average friction coefficients between the two tests.
    These results were useful to design the optimum thickness and dispersed particles of surface modified layer.

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  • Evaluation of Tribological Performance of High Functional Surface Midified Machine Element under High Temperature in High Vacuum

    Grant number:10650147  1998 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    FUJII Masahiro

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    Grant amount:\3300000 ( Direct expense: \3300000 )

    In order to evaluate the tribological characteristic and peformance of high functional modified surface, the comprehensive experiment and analysis were performed under high temperature in high vacuum.
    Kinds of high functional sliding materials were wear-tested under high temperature in high vacuum and the information of their ability were obtained.
    In order to clarify the influence of surface modification on rolling contact fatigue strength the surface modified rollers were fatigue-tested and their contact pressure and subsurface stresses were analysed with the boundary element method. The reason why the improvement of rolling contact fatigue strength by surface modifications would be due to the reduction of contact pressure and subsurface stresses.
    Various electroless Ni platings were wear-tested with a two-cylinder test machine and the influence of dispersed particles in the plated layer on friction and wear behaviors was investigated with the finite element method analysis. When the elastic modulus of the dispersed particles is smaller than that of the matrix, the maximum shear stress and Mises stress around the dispersed particles become large, resulting in wear increasing. It was indicated how to decide the optimum particle size.
    Fractal dimensions of various worn surfaces were analysed with data measured with a profile meter and a laser-scanning microscope, and applied to the evaluation of worn surface. It was obvious that the more beneficial information could be obtained using fractal dimensions analysed with both instruments.

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  • Research on Surface Failure Mechanism and Failure Prediction and Diagnosis of Surface Modified Gears

    Grant number:10555052  1998 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B).  Grant-in-Aid for Scientific Research (B).

    YOSHIDA Akira, SEKI Masanori, OHUE Yuji, FUJII Masahiro

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    Grant amount:\12000000 ( Direct expense: \12000000 )

    This research is a further research to clarify the surface failure mechanism and the failure prediction and diagnosis of the surface modified gears. In this research, electroless Ni-P alloy plating, sulphurizing, Sn plating with thermal diffusion and ion-nitriding were employed as surface modification. Wear characteristics, rolling contact fatigue behavior and gear performance of these surface modified specimens were examined under oil lubrication and in vacuum. These experimental results were discussed using the analytical results by BEM, wavelet transform and so on.
    The rolling contact fatigue strength of the surface modified roller was higher than that of the roller without surface modification. The contact stress of the roller coated with modified layer having lower elastic modulus was lower than that of the roller without surface modification. It could be considered that the higher rolling contact strength by the surface modification was mainly due to the lower contact stress by the surface modification. The friction coefficient of electroless Ni-P plated, Sn plated and surphurized gear sets was lower than that of non-coated gear set in vacuum. The change in the tooth profile of these gears was well corresponding to the change in the tooth root strain wave.
    By the roller test for the failure prediction and diagnosis of pitting and spalling, it could be said that the pitting failure and the spalling failure can be separately predicted by considering both the magnitude of the forced displacement between the contact rollers and the pattern of the wavelet map. Concerning the prediction and diagnosis of gear surface failure by the wavelet transform of the dynamic characteristics of the gear, it could be clarified that the failed tooth can be determined by the vibration data of the gear box and the failure position on tooth flank may be determined by the data of dynamic tooth root strain. The wavelet transform analysis was more usefull than the FFT analysis for the diagnosis of the gear failure.

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  • Fundamental Study on Surface Durability and Dynamic Performance of Gear with Multiplex Surface Modification

    Grant number:09450069  1997 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    YOSHIDA Akira, SEKI Masanori, OHUE Yuji, FUJII Masahiro

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    Grant amount:\14300000 ( Direct expense: \14300000 )

    This research is a fundamental study for improving the tooth surface durability by multiplex surface modification to reduce the size of gear transmission unit. The aim of this study is to clarify the improving mechanism of tooth surface durability, the surface failure mechanism, the design method for surface durability and the evaluation method of dynamic performance of gear.
    The operating fatigue tests of gears and rollers, which were shot-peened after the case hardening, were performed using a power circulating gear test machine developed in 1997 and a conventional two cylinder test machine.
    In the case of steel, the surface durability of shot-peened gear and roller was improved since the compressive residual stress was increased by the shot-peening and the crack initiation and propagation were restrained.
    In the case of sintered powder metal, the surface durability was decreased by the shot-peening with the higher arc-height value since the pores in the material were crushed and the notch sensitivity factor was increased, while, the surface durability was increased by the shot-peening with the lower arc-height value since the pores were hardly crushed and the effects of work-hardening and compressive residual stress were achieved.
    The dynamic performance of the gear was also investigated using the wavelet transform. The vibration and noise of the surface modified sintered gear were lower than those of the steel one.

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  • Research and Development on Evaluation of Surface Damage and Performance of Gear Pairs under Extreme Environment

    Grant number:07505003  1995 - 1997

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    YOSHIDA Akira, MIURA Kenzo, YUJI Ohue, FUJII Masahiro

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    Grant amount:\40600000 ( Direct expense: \40600000 )

    To evaluate the tooth flank damage and the driving performance under extreme environments, a gear test rig employed in high vacuum was designed and developed. The tribological research was performed in high vacuum as well as under normal enrivonment and at high temperature. Friction and wear characteristics of fine ceramics at high temperature were elucidated with Sialon, Al_2O_3 and ZrO_2, which were the typical fine ceramics. The wear and suffing performance of the wear resisting steel (WRS), which was a newly developed steel, was examined. The friction and wear characteristics of WRS was superior and the electroless Ni-P alloy plated WRS had high scuffing capacity at high specific sliding, but the sulfurized WRS was not so improved. The influence of the surface modification treatment on the rolling contact fatigue and the scuffing capacity of rollers was examined. The rolling contact fatigue strength and the scuffing capacity of the electroless Ni-P alloy plated rollers were larger than those of the non-coated rollers and the improvement of scuffing capacity was remarkable at high specific sliding. Friction and wear characteristics of surface modified gears and rollers in high vaccum were examined by spur gear and two cylinder tests. In case of rollers the wear rate of electroless Ni-P alloy plating was larger than that of Sn plating, but in case of gear pair that was the other way about. In case of sulfurizing the initial friction coefficient was low and the torque loss was small under the low pressure where the wear of the sulfurized layr was small. The initial friction coefficient of the Sn plating increased under the low contact pressure, where wear particles were transferred onto the frictional surface, while the friction coefficient decreased, and the torque loss and the change of tooth profile were the smallest after the surface modified layr worn uniformly.

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  • Study on Surface Strength Increasing of Sliding Rolling Machine Element by Multiplex Surface Treatment

    Grant number:07455075  1995 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    YOSHIDA Akira, OHUE Yuji, FUJII Masahiro

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    Grant amount:\2800000 ( Direct expense: \2800000 )

    For the development of light weight and compact power transmission unit in recent machine such as motor car, the problem of surface strength design of gear becomes sever and it becomes a pressing need to investigate the improving method of the surface strength of sliding-rolling contact machine element. This research project was planned to increase the surface strength of sliding-rolling contact machine element by the multiplex surface treatment which is achieved by additional treatments of shot-peening, plating, coating and so forth on the conventional heat-treated surface-hardened element. This project intends also to clarify the surface failure model and the increasing mechanism of surface strength of the multiplex surface treated machine element. The results which were perfomed as a fundamental research for above mentioned intentions are summarised mainly as follows ;
    1. The surface durabilities of ion-nitrided roller and gear increased as the hardened depth increased, the particle diameter of powder decreased and the green density increased. It was understood from the results of image processing and fractal dimension analysis of pore that the surface durability of ion-nitrided sintered machine element was highly affected by the pore distribution.
    2. Hobbed, electrical discharge machined and shaved gear were surface-modified by shot-peening. These surface durabilities increased slightly by the shot-peening.
    3. Concerning the multiplex surface-treated machine element, the surface durabilities of case-hardened rollers modified by electroless Ni-P plating and sulfurizing were improved by their surface modifications. The scuffing load of sulfurized one was hardly improved, but that of electroless Ni-P plating one was improved at operating conditions of higher specific sliding.

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  • 高真空下におけるセラミックスおよび改質表面のトライボロジー特性評価に関する研究

    Grant number:07750169  1995

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    藤井 正浩

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    Grant amount:\1000000 ( Direct expense: \1000000 )

    本研究は表面改質技術を実用の機械要素である歯車などに適用するための基礎的研究として,高真空2円筒試験機を用いて,セラミックス被覆ローラおよび接触面に各種被覆法を施した表面改質ローラについて,すべり転がり接触条件下の表面強さ,摩擦・摩耗,損傷,性能などのトライボロジー特性を調べ,摩擦・摩耗機構および損傷機構を明らかにするとともに,真空などの特殊環境下で使用される動力伝達機械要素に最適な表面改質法を検討することを目的とする.実験に用いた表面改質ローラのバルク材はステンレス鋼SUS440Cである.ローラにはCr_2O_3セラミックス溶射,無電解Ni-P合金めっき,Snめっき熱拡散処理および浸硫処理の表面改質が施された.実験は新しく開発した高真空2円筒試験機を用いてすべり転がり接触条件下で行わた.また,境界要素法による接触面温度解析が行われ,損傷形態および損傷機構との関連が検討された.本年度の研究から以下のような結果が得られた.(1)Cr_2O_3溶射の場合を除いて,表面改質を施したローラでは未処理ローラより低い摩擦係数を示した.(2)いずれの表面改質ローラにおいても接触圧力の増加に伴い摩擦係数は低下する傾向が見られたが,特にSnめっき熱拡散処理の場合で顕著であった.(3)摩耗量はCr_2O_3溶射の場合が最大で,無電解Ni-P合金めっきと浸硫処理の場合が小さかった.(4)本年度の実験範囲では,無電解Ni-P合金めっきと浸硫処理の場合の摩耗量ならびにその変化が小さかった.一方,Cr_2O_3溶射の場合の摩擦係数は大きく,摩耗量も最大であり,真空中での使用には不適であるといえた.

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  • セラミックスの高温トライボロジー特性に及ぼす雰囲気中水分量の影響

    Grant number:06750147  1994

    日本学術振興会  科学研究費助成事業 奨励研究(A)  奨励研究(A)

    藤井 正浩

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    Grant amount:\900000 ( Direc