Updated on 2024/01/05

写真a

 
OKADA Akira
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
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Degree

  • Master(Engineering) ( Okayama University )

  • Doctor(Engineering) ( Osaka University )

Research Interests

  • Electrical Discharge Machining

  • Electron Beam Machining

  • Laser Processings

  • Advanced Machining Technology

  • Nontraditional Machining

Research Areas

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

  • Nanotechnology/Materials / Material processing and microstructure control

Education

  • Okayama University   工学研究科   機械工学専攻

    1992.4 - 1994.3

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    Country: Japan

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  • Okayama University   工学部   機械工学

    1988.4 - 1992.3

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    Country: Japan

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Research History

  • Okayama University

    2023.4

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  • Okayama University   学術研究院 環境生命自然科学学域   Professor

    2011.4

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    Country:Japan

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  • Okayama University   Associate Professor

    2006.7 - 2011.3

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    Country:Japan

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  • The University of Edinburgh   Visiting Researcher

    2004.11 - 2005.9

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    Country:United Kingdom

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  • Okayama University   Lecturer

    1998.7 - 2006.6

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    Country:Japan

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  • Okayama University   Research Assistant

    1994.4 - 1998.6

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    Country:Japan

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Professional Memberships

  • CIRP (International Academy for Production Engineering)

    2008

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  • Japan Society for Die and Mould Technology

    2003

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  • Japan Society of Mechanical Engineers

    1993

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  • Japan Society for Precision Engineering

    1993

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  • Japan Society of Electrical Machining Engineers

    1992

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  • American Society for Precision Engineering

    1998

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Committee Memberships

  • Japan Society of Electrical Machining Engineers   West Japan Branch, Chairman  

    2020   

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  • Japan Society of Mechanical Engineering   Manufacturing and Machine Tool Division, Board Member  

    2018 - 2020   

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  • Association for Advanced Machining Technologies   Chairman  

    2016   

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  • Japan Society of Electrical Machining Engineers   IJEM Editorial Board Committee, Chairman  

    2013   

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  • Japan Society for Precision Engineering   Chugoku Shikoku Branch, Board Member  

    2006   

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  • 電気加工学会   全国大会実行委員会実行委員長  

    2024.1 - 2024.12   

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  • 精密工学会   秋季学術講演会実行絵委員会副委員長  

    2023.12 - 2024.9   

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  • Japan Society for Mechanical Engineering   LEM&P International Conference, Scientific Committee Member  

    2023   

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  • Japan Society of Electrical Machining Engineers   Council Member  

    2010   

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  • Japan Society of Electrical Machining Engineers   IJEM Editorial Board Member  

    2007 - 2012   

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  • Japan Society of Electrical Machining Engineers   West Japan Branch, Board Member  

    2005   

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  •   Journal Editorial Board Member  

    2001 - 2004   

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Papers

  • Reconditioning of Diamond Coated Tools and Its Impact on Cutting Performance for CFRP Laminates Reviewed International coauthorship International journal

    Alexander Soldatov, Alexey Remnev, Akira Okada

    Applied Sciences   12 ( 3 )   1288 - 1288   2022.1

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In recent years, CVD diamond-coated tungsten carbide (WC-Co) tools have been widely utilized due to their benefits in the machining of non-ferrous alloys and polymer composite materials, especially carbon-fiber-reinforced plastics (CFRPs). The reconditioning of such coated tools is economically attractive due to their high cost and short tool life. The decoating of the remaining diamond film from the used tools and the subsequent surface preparation by wet chemical pretreatment are essential steps for new CVD diamond film formation. Previously, it was shown that reactive ion beam etching (RIBE) could effectively remove CVD diamond films. However, some degree of WC-Co tool substrate damage is expected due to the high ion energy in RIBE and the chemical activity in wet etching. This study addresses the effects of RIBE decoating and surface pretreatment steps on WC-Co tools with a complex shape in terms of the ion-induced surface damage, geometry alteration, and adhesion of a subsequently re-applied CVD diamond film. Moreover, the cutting performance of the tools subjected to the RIBE decoating and repeated film deposition was studied via CFRP cutting tests. It has been shown that the RIBE decoated and recoated tools had a high level of cutting performance comparable to the new tools.

    DOI: 10.3390/app12031288

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  • Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet Reviewed International journal

    Togo Shinonaga, Jiayu Lu, Mitsuhiro Kimura, Motohiro Inoue, Akira Okada

    The International Journal of Advanced Manufacturing Technology   119   4979 - 4990   2022.1

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00170-021-08380-w

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    Other Link: https://link.springer.com/article/10.1007/s00170-021-08380-w/fulltext.html

  • Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    Atsushi YAMAGUCHI, Yuta INABA, Sho SHIRAGA, Akira OKADA

    Journal of the Japan Society for Precision Engineering   87 ( 5 )   461 - 466   2021.5

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society for Precision Engineering  

    DOI: 10.2493/jjspe.87.461

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  • Fundamental study on reduction of dross in fiber laser cutting of steel by shifting nozzle axis Reviewed International journal

    Atsushi Yagi, Seigo Kadonaga, Yasuhiro Okamoto, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita, Akira Okada

    Journal of Laser Applications   33 ( 1 )   012022 - 012022   2021.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Laser Institute of America  

    DOI: 10.2351/7.0000300

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  • Surface smoothing and repairing of additively manufactured metal products by large-area electron beam irradiation Reviewed International journal

    T. Shinonaga, A. Yamaguchi, Y. Okamoto, A. Okada

    CIRP Annals - Manufacturing Technology   70 ( 1 )   143 - 146   2021

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.cirp.2021.04.063

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  • Application of large-area electron beam irradiation to micro-edge filleting Reviewed International journal

    Togo Shinonaga, Hibiki Tajima, Yasuhiro Okamoto, Akira Okada

    Journal of Manufacturing Processes   107   65 - 73   2023.12

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jmapro.2023.10.039

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  • Fundamental Study on Influence of Ground Surface Characteristics o n Mold Releasability in Compression Molding Using Thermosetting Phenol Resin Reviewed International journal

    Qin Wang, Ryoji Kitada, Koki Yoshida, Akira Okada

    Proceedings of The 10th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN 2023)   2023.11

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Fundamental Study on CO2 Laser Forming of Carbon Fiber Reinforced Thermoplastic Sheet Reviewed International journal

    Ryoji Kitada, Sena Kizaki, Yasuhiro Okamoto, Akira Okada

    Proceedings of The 10th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN 2023)   2023.11

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  • Fiber Laser Cutting of Steel Plate by Twin Spot Beam Setting in Scanning Direction Reviewed International journal

    Yasuhiro Okamoto, Kota Morimoto, Naoki Kai, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Hiroshi Okawa

    Journal of Laser Applications   35 ( 4 )   042049:1 - 042049:111   2023.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Laser Institute of America  

    This study investigated the effects of laser beam intensity distribution on the reduction of dross height in fiber laser cutting of a steel plate with 3.2 mm thickness. A twin-spot beam was produced by splitting a single Gaussian beam into two beams using a special axicon lens, and these beams were set in the scanning direction for cutting experiments. The power ratio of two beams (R:F = Rear power:Front power) was varied to discuss the intensity balance for the effective reduction of dross. After cutting experiments, ray tracing analysis was conducted using an optical analysis to calculate the absorbed power density distributions in the kerf. A smaller dross height of 18 μm can be achieved at a power ratio of R:F = 8:2, and its value is lower than that by a single Gaussian beam. At a power ratio of R:F = 8:2, the front beam of lower power is irradiated at the upper part of the workpiece, and the rear beam of higher power is absorbed at the lower part of the workpiece. Thus, effective heat input to the lower part of the workpiece can contribute to a reduction of the dross height. Variation of power ratio in the rear and the front beams is effective in controlling the cutting front shape, and the uniformity of absorbed power in the thickness direction can be improved by setting the rear beam of about four times higher power to the front beam of lower power to obtain a smaller dross height in the case of a 3.2 mm steel plate.

    DOI: 10.2351/7.0001097

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  • Fundamental Study onHigh-quality Welding of Copper and Aluminum by Angled and Superposed Irradiation of Blue and Near-infrared Lasers Reviewed International journal

    Yuki Yamada, Yasuhiro Okamoto, Akira Okada, Norio Nishi, Takeshi Yamamura, Katsutoshi Nagasaki, Kazunobu Mameno

    Journal of Laser Applications   35 ( 4 )   042005:1 - 042005-9   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Laser Institute of America  

    In order to achieve sustainable development goals, decarbonization and low-carbonization are required. Electric and hybrid vehicles are indispensable for the conservation of natural environment, and the lightweight construction and the effective transfer of electricity become important. Thus, copper and aluminum have been increasingly recognized as important materials because of their excellent materials’ properties. However, in the welding of these materials, it is difficult to obtain strong joints because there are problems in the brittle intermetallic compounds and the welding defects due to different melting points between copper and aluminum. Especially in the joining of copper and aluminum by copper side irradiation, aluminum-rich intermetallic compounds (IMCs) of brittle state result in the decrease of mechanical strength. Therefore, mild heat input from copper to aluminum would be necessary to reduce the brittle IMC. Angled irradiation might result in the mild energy input to aluminum because it can be expected that aluminum would be heated by the reflected light inside the keyhole generated in copper according to its high light reflection. In addition, stable welding can be expected by the superposed irradiation of blue and near-infrared lasers because of high light absorption rate of blue laser to copper. The angled and the superposed irradiation could achieve a stable welding state, and the generation of aluminum-rich IMC becomes smaller. Angled irradiation of a near-infrared laser showed equivalent joining strength to the superposed irradiation of two wavelengths, and the combination of angled and superposed irradiation achieved a remarkable increase of joining strength in a cross tensile test by 80%.

    DOI: 10.2351/7.0001096

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  • Stabilizing the absorption of laser energy in welding of copper Reviewed International journal

    Yasuhiro Okamoto, Norio Nishi, Togo Shinonaga, Akira Okada

    15th International Conference on Materials Processing and Characterization (ICMPC)   2023.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Investigation on improvement of wafer thickness uniformity in multi-wire EDM slicing Reviewed International journal

    Takumi Yoshida, Haruya Kurihara, Yasuhiro Okamoto, Akira Okada

    15th International Conference on Materials Processing and Characterization (ICMPC)   2023.9

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  • Surface smoothing of additively manufactured Ti-6Al-4 V alloy by combination of grit blasting and large-area electron beam irradiation Reviewed International coauthorship International journal

    Togo Shinonaga, Hiroya Kobayashi, Akira Okada, Toshiya Tsuji

    The International Journal of Advanced Manufacturing Technology   127   5127 - 5137   2023.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Additively manufactured (AMed) titanium products are typically produced by electron beam melting (EBM), since oxidation of titanium alloy surface can be suppressed in vacuum environment. The surface roughness of AMed titanium products becomes more than 200 µm Rz, and the very rough surface would lead to reduction in fatigue strength. Therefore, a post surface finishing process is required. Abrasive blasting is one of the common surface smoothing processes of AMed metal products. Large surface roughness can be decreased, and compressive residual stress can be introduced to the surface. However, there is a limitation to reduction of surface roughness to several µm Rz. On the other hand, it was recently found that AMed metal surface produced by powder bed fusion with laser beam could be smoothed by large-area electron beam (LEB) irradiation. However, it is difficult to smooth surface with large initial surface roughness, and a tensile residual stress may be generated on the surface. In this study, surface smoothing and change in residual stress of AMed titanium alloy (Ti-6Al-4 V) were proposed by combination of grit blasting and LEB irradiation. Surface roughness of AMed Ti-6Al-4 V alloy significantly decreases from 265 to about 2.0 µm Rz by combination of grit blasting and LEB irradiation. Reduction rate of surface roughness by LEB irradiation linearly increases with decreasing mean width of blasted surface. Influence of the mean width on smoothing effect by LEB irradiation can be explained by thermo-fluid analysis. Moreover, tensile residual stress caused by LEB irradiation can be reduced when LEB is irradiated to blasted surface.

    DOI: 10.1007/s00170-023-11857-5

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    Other Link: https://link.springer.com/article/10.1007/s00170-023-11857-5/fulltext.html

  • Investigation on high-quality laser welding of copper and aluminum Invited Reviewed International journal

    Yasuhiro Okamoto, Yuki Yamada, Akihiro Ochi, Akira Okada, Takeshi Yamamura, Katsutoshi Nagasaki, Kazunobu Mameno, Norio Nishi

    International Conference on Processing & Manufacturing of Advanced Materials (THERMEC2023)   2023.7

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  • Study on Joint Characteristics in Laser Butt Welding of AMed and Wrought Ti6Al4V Plates Reviewed International coauthorship International journal

    Yasuhiro Okamoto, Togo Shinonaga, Yoshito Takemoto, Akira Okada, Akihiro Ochi, Ryuya Kishimoto, Sisa Pityana, Nana Arthur, Peter Omoniyi, Rasheedat Mahamood, Martin Maina, Esther Akinlabi

    Welding in the World   67 ( 5 )   1997 - 2005   2023.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Titanium alloy Ti6Al4V has been widely applied to medical, automotive, and aerospace industries due to its excellent properties such as high strength and excellent corrosion resistance. On the other hand, additive manufacturing (AM) technology can give the freedom of design of the products. In order to spread the AMed products, the joining of AMed and wrought products are required, and it is important to understand the joint characteristics. In this study, butt welding of Ti6Al4V plate was conducted by fiber laser in argon shielding, and the joint characteristics of laser weld wrought/wrought, AMed/AMed, and AMed/wrought Ti6Al4V plates were experimentally investigated. The AMed plate has higher tensile strength than wrought plate but the elongation of AMed plate is smaller, since AMed plate has α’ martensite due to rapid cooling during laser irradiation in AM process. Then, the laser weld joint of AMed/AMed plates has higher tensile strength, but smaller elongation than that of wrought/wrought plates. The weld joint of AMed/wrought plates shows good welding state, since small heat input leads to formation of small weld bead with higher hardness between wrought and AMed plates.

    DOI: 10.1007/s40194-023-01533-3

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    Other Link: https://link.springer.com/article/10.1007/s40194-023-01533-3/fulltext.html

  • Micro-welding of Glass by Multiple Spot of Picosecond Pulsed Laser with Spatial Light Modulator Reviewed International journal

    Ryo Takashima, Yasuhiro Okamoto, Akira Okada

    Technical Digest of the 24th International Symposium on Laser Precision Microfabrication – LPM2023   R3-S15-3   2023.6

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  • Optimization of Dielectric Oil Resistivity on Wire EDM Characteristics Reviewed International journal

    Shixian Liu, Akira Okada, Tomohiko Kitamura

    Proceeding of the 16th international conference of the european society for precision engineering and nanotechnology   23   2023.6

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  • Investigation on Laser Welding of Copper and Aluminum by Irradiation from Copper-side Invited Reviewed International journal

    Yasuhiro Okamoto, Yuki Yamada, Akihiro Ochi, Takeshi Yamamura, Katsutoshi Nagasaki, Kazunobu Mameno, Norio Nishi, Akira Okada

    Proceedings of Laser in Manufacturing 2023   176   2023.6

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  • Fundamental Study on High-quality Micro-shape Fabrication on Monocrystalline Diamond by Nanosecond Pulsed Laser International journal

    Kaichi Kawata, Yasuhiro Okamoto, Akira Okada

    Technical Digest of the 24th International Symposium on Laser Precision Microfabrication – LPM2023   R3-S11-2   2023.6

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  • Effect of scanning speed on molten metal behaviour under angled irradiation with a continuous-wave laser Reviewed International journal

    Tatsuhiko Sakai, Yasuhiro Okamoto, Nozomi Taura, Riku Saito, Akira Okada

    Journal of Materials Processing Technology   313   117866 - 117866   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jmatprotec.2023.117866

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  • Fundamental Study on Electrode Performance of Diamond Composite for EDM Reviewed International journal

    Shun-ichiro Tsuetani, Koki Yoshida, Akira Okada

    International Journal of Electrical Machining   ( 28 )   26 - 31   2023.3

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  • Improvement in Mechanical Properties of AMed Al-Si Alloy Surface by Large-area EB Irradiation Reviewed International journal

    Togo Shinonaga, Hiroya Kobayashi, Atsuhi Yamaguchi, Akira Okada

    International Journal of Electrical Machining   ( 28 )   20 - 25   2023.3

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  • Mo-rich layer formation on maraging steel and surface modification by large-area electron beam irradiation Reviewed International journal

    Togo Shinonaga, Shun Watanabe, Atsushi Yamaguchi, Akira Okada

    Journal of Materials Processing Technology   311   117813 - 117813   2023.1

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jmatprotec.2022.117813

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  • Influence of dielectric oil resistivity on wire EDM characteristics Reviewed International journal

    Shixian Liu, Akira Okada, Tomohiko Kitamura

    Proceedings of 4th International Conference on Machining Materials and Mechanical Technologies IC3MT2022   2022.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Influence of Nozzle Jet Flushing in Wire EDM on Machining Characteristics Reviewed International journal

    Shogo KIMURA, Shixian LIU, Akira OKADA, Haruya KURIHARA

    Proceedings of the 19th International Machine Tool Engineeris' Conference   2 - 3   2022.11

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  • Improvement in EDM Characteristics for Internal Space Shape Using Revolution Ball Electrode by Servo Control of Rotation Speed Reviewed International journal

    Kodai Fujieda, Atsushi Yamaguchi, Akira Okada

    Proceedings of 19th International Conference on Precision Engineering   C216   2022.11

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  • Influence of Focusing Position on Micro-groove Formation on Metal Surface by High-speed Scanning of Angled CW Laser Irradiation Reviewed International journal

    Riku Saito, Yasuhiro Okamoto, Akira Okada, Tatsuhiko Sakai

    Proceedings of 19th International Conference on Precision Engineering   2022.11

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  • Fundamental Study on Laser Forming of Carbon Fiber Reinforced Thermoplastic Sheet with Low Surface Damage by Using Pulsed CO2 Laser Reviewed International journal

    Rina WATANABE, Ryoji KITADA, Yasuhiro OKAMOTO, Akira OKADA, Sena KIZAKI

    Proceedings of 19th International Conference on Precision Engineering   2022.11

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  • Fabrication of High-quality Micro-shape on Monocrystalline Diamond Surface by Nanosecond Pulsed Laser and Acid Cleaning Reviewed International journal

    Tsubasa Okubo, Yasuhiro Okamoto, Akira Okada

    Proceedings of 4th International Conference on Machining Materials and Mechanical Technologies IC3MT2022   2022.11

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  • Improvement of Anodic Oxide Film Characteristics of Al-Cu Alloy by Large-area Electron Beam Reviewed International journal

    Ikuya Miyamoto, Togo Shinonaga, Akira Okada

    Proceedings of 19th International Conference on Precision Engineering   2022.11

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  • Investigation on Mechanism of Edge Shape Change in Large-area Electron Beam Irradiation by Thermo-fluid Analysis Reviewed International journal

    Hibiki Tajima, Togo Shinonaga, Akira Okada

    Proceedings of 4th International Conference on Machining Materials and Mechanical Technologies IC3MT2022   2022.11

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  • Influence of surface roughness of die sinking EDM on mold releasability in compression molding of thermosetting phenol resin Reviewed International journal

    Ryoji Kitada, Qin Wang, Shun-ichiro Tsuetani, Akira Okada

    Procedia CIRP   113   238 - 243   2022.10

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier BV  

    DOI: 10.1016/j.procir.2022.09.152

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  • Optimization of Dielectric Oil Viscosity for High-precision Wire EDM Reviewed International journal

    Shixian LIU, Shogo KIMURA, Akira OKADA, Tomohiko KITAMURA

    Procedia CIRP   113   244 - 249   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier BV  

    DOI: 10.1016/j.procir.2022.09.153

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  • Influence of Nozzle Jet Flushing in Wire EDM of Workpiece with Stepped Thickness Reviewed International journal

    Shogo KIMURA, Hiroki IWAI, Shixian LIU, Akira OKADA, Haruya KURIHARA

    Procedia CIRP   113   149 - 154   2022.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier BV  

    DOI: 10.1016/j.procir.2022.09.123

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  • Study on Smoothing of Hole Wall Surface by Electron Beam Polishing under Control of Magnetic Field Reviewed International journal

    Togo SHINONAGA, Jiayu LU, Motohiro INOUE, Akira OKADA

    Procedia CIRP   113   536 - 540   2022.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier BV  

    DOI: 10.1016/j.procir.2022.09.184

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  • Synergy Effect of Abrasive Blasting and Large-area EB Irradiation on Surface Finishing of AMed Titanium Alloy Reviewed International journal

    Hiroya KOBAYASHI, Togo SHINONAGA, Toshiya TSUJI, Akira OKADA

    Procedia CIRP   113   318 - 322   2022.10

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Elsevier BV  

    DOI: 10.1016/j.procir.2022.09.109

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  • Fiber laser cutting of steel materials with twin spot beam-twin spot setting in kerf width direction Reviewed International journal

    Kota Morimoto, Atsushi Yagi, Naoto Kai, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa

    Journal of Laser Applications   34   042009-1 - 042009-7   2022.9

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    DOI: 10.2351/7.0000740

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  • Study on Joint Characteristics in Laser Butt Welding of AMed and Bulk Ti6Al4V Plates Reviewed International coauthorship International journal

    Yasuhiro Okamoto, Togo Shinonaga, Yoshito Takemoto, Akira Okada, Akihiro Ochi, Ryuya Kishimoto, Sisa Pityana, Nana Arthur, Peter Omoniyi, Rasheedat Mahamood, Martin Maina, Esther Akinlabi

    Proceedings of IIW 2022 International Conference on Welding and Joining   469 - 472   2022.7

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  • High-quality Micro-shape Fabrication of Monocrystalline Diamond by Nanosecond Pulsed Laser and Acid Cleaning Reviewed International journal

    Yasuhiro Okamoto, Tsubasa Okubo, Atsushi Kajitani, Akira Okada

    International Journal of Extreme Manufacturing   4   25301   2022.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    <title>Abstract</title>
    The flat plane of small surface roughness below 0.1 µm average roughness could be obtained for monocrystalline diamond by nanosecond pulsed laser irradiation of 1060 nm and post-process of acid cleaning, at the laser fluence around the threshold value of material removal. The glossy and flat plane at the bottom of micro-groove was parallel to the top surface of specimen, although the round beam of Gaussian-mode was irradiated in the direction perpendicular to the top surface of specimen. The square beam of top-hat mode could obtain shallower micro-groove with wide flat bottom in comparison with the round beam of Gaussian mode, and then the creation method of flat plane with small surface roughness was discussed in the arrangement strategy of linear micro-grooving by the square beam of top-hat mode. Normal side-by-side repetition of linear micro-grooving could not create the flat plane of a constant depth. Therefore, two-step scanning method was proposed in order to overcome the problem in the normal side-by-side repetition of liner micro-grooving. Non-removal areas were partly retained between the processing lines in the first step, and the laser scanning was conducted on the retained area in the second step. Newly proposed two-step scanning method was practical and useful to create a wide flat plane with small surface roughness, and the controllability of micro-groove depth could be improved by the two-step scanning method. This proposed method can reduce the surface roughness in addition to the shape creation of monocrystalline diamond, and it can be used as the high-quality micro-shape fabrication method of monocrystalline diamond.

    DOI: 10.1088/2631-7990/ac5a6a

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  • Study on Laser Drilling Process of Solid Metal on Its Liquid Reviewed International journal

    Yasuhiro Okamoto, Nozomi Taura, Akira Okada

    International Journal of Electrical Machining   27   35 - 39   2022.3

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  • Improvement in Corrosion Resistance of Al-Cu Alloy by Large-area Electron Beam Irradiation Reviewed International journal

    Togo Shinonaga, Shun Watanabe, Akira Okada

    International Journal of Electrical Machining   27   22 - 27   2022.3

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    DOI: 10.2526/ijem.27.22

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  • Effects of superposition of 532 nm and 1064 nm wavelengths in copper micro-welding by pulsed Nd:YAG laser Reviewed International journal

    Martin Ruthandi Maina, Yasuhiro Okamoto, Kazuki Hamada, Akira Okada, Shin-ichi Nakashiba, Norio Nishi

    Journal of Materials Processing Technology   299   117388   2022.1

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    DOI: 10.1016/j.jmatprotec.2021.117388

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  • Fundamental Study on Laser Forming Characteristics of Carbon Fiber Reinforced Thermoplastic Sheet Reviewed International journal

    Ryoji KITADA, Rina WATANABE, Takashi KAWAZOE, Yasuhiro OKAMOTO, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D26   2021.11

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  • Fundamental Study on Surface Texturing of Alloy Steel by Ultrashort Pulsed Laser for Control of Water Repellency Reviewed International journal

    Kentaro MURATA, Togo SHINONAGA, Yasuhiro OKAMOTO, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D25   2021.11

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  • Fundamental Investigation of Working fluid Flow Formed by High-speed Wire Running in Multi-wire EDM Slicing Reviewed International journal

    Shusei TABUCHI, Yasuhiro OKAMOTO, Akira OKADA, Haruya KURIHARA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   G08   2021.11

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  • Direct Observation of Spark Locations in Fine Wire EDM Using High-speed Camera Reviewed International journal

    Yu MIYAZAKI, Shixian LIU, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   G07   2021.11

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  • Possibility of Compositionally Graded Surface Formation by Electrical Discharge Machining Reviewed International journal

    Shun-ichiro TSUETANI, Yuki IKEUCHI, Akira OKADA, Ryoji KITADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   G06   2021.11

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  • Influence of Working Oil Viscosity on Wire EDM Characteristics Reviewed International journal

    Shixian LIU, Hiroki IWAI, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   G03   2021.11

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  • Fundamental Study on Calcination Method of Limestone by Using CW Laser of Near-infrared Reviewed International journal

    Takafumi MIYAJIMA, Yasuhiro OKAMOTO, Shuji FUJIKI, Masakazu OKA, Shunjirou SHIZUKA, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D24   2021.11

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  • Fundamental Study on Laser Micro-welding of Glass by Using Spatial Light Modulator Reviewed International journal

    Kazuki IHORIYA, Yasuhiro OKAMOTO, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D22   2021.11

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  • Surface Smoothing and Surface Modification of Maraging Steel by Large-area EB Irradiation Reviewed International journal

    Shun WATANABE, Togo SHINONAGA, Atsushi YAMAGUCHI, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D17   2021.11

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  • Fundamental Study on Side Surface Smoothing of Hole by Large-area EB Irradiation Method Reviewed International journal

    Jiayu LU, Togo SHINONAGA, Motohiro INOUE, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   D16   2021.11

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  • Investigation on reduction of dross height by analyzing beam intensity distribution in fiber laser cutting Reviewed International journal

    Naoto Kai, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita

    Journal of Laser Applications   33 ( 4 )   042008 - 042008   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Laser Institute of America  

    DOI: 10.2351/7.0000470

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  • Fundamental Study on Factors of Mold Releasability from Milling Surface in Compression Molding of Thermosetting Phenol Resin Reviewed International journal

    Ryoji KITADA, Qin WANG, Kazuhiro KAWAGUCHI, Shun-ichiro TSUETANI, Akira OKADA

    Proceedings of the 10th International Conference on Leading Edge Manufacturing in 21st Century   C08   2021.11

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  • Formation and Its Mechanism of High-speed Micro-grooving on Metal Surface by Angled CW Laser Irradiation Reviewed International journal

    Nozomi Taura, Akiya Mitsunobu, Tatsuhiko Sakai, Yasuhiro Okamoto, Akira Okada

    Journal of Laser Micro/Nanoengineering   16 ( 2 )   2021.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Laser Processing Society  

    DOI: 10.2961/jlmn.2021.02.2006

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  • Influence of Free-electron Density Distribution on Mechanical Strength in Micro-welding of Glass by Picosecond Pulsed Laser Reviewed International journal

    Zhiyong Ouyang, Yasuhiro Okamoto, Kazuki Ihoriya, Akira Okada

    Journal of Smart Processing   10 ( 5 )   294 - 300   2021.9

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  • Cutting performance evaluation of boron-doped and undoped diamond coatings in drilling of CFRP laminates Reviewed International journal

    Alexander Soldatov, Akira Okada, Hitoshi Ogawa

    Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture   095440542110406 - 095440542110406   2021.8

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    This study investigated the effect of boron-doped and undoped diamond coatings on the cutting performance of cobalt cemented tungsten carbide (WC-Co) drills when drilling CFRP. Three types of diamond coating, as boron-doped microcrystalline (B-MCD), boron-doped nanocrystalline (B-NCD), and undoped nanocrystalline (NCD), were deposited on specially designed for drilling of CFRP one-shot drills by the hot filament chemical vapor deposition (HFCVD) method. The coating characteristics, such as surface morphology, roughness, carbon structure, and interfacial adhesion, were investigated. Then cutting tests were carried out, and the tool’s flank wear, thrust force, and torque were evaluated. For comparison of cutting performance, non-coated WC-Co drills were used in the tests as well. Furthermore, drilled holes were inspected in terms of peel-up and push-out delamination. According to the results, the B-MCD coated drill presented advantages in tool life, and quality of drilled holes over the NCD and B-NCD coated drills. Also, the results confirmed the adhesion enhanced effect of diamond coating to WC-Co substrate through boron doping of the layer.

    DOI: 10.1177/09544054211040624

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    Other Link: http://journals.sagepub.com/doi/full-xml/10.1177/09544054211040624

  • Formation of Smooth and Flat Area for Monocrystalline Diamond by ns Pulsed Laser Reviewed International journal

    Yasuhiro Okamoto, Tsubasa Okubo, Atsuya Kajitani, Akira Okada

    Proceedings of Laser in Manufacturing 2021   21 - 24   2021.6

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  • Reliable and strong micro-welding of glass by ultrashort pulsed laser Reviewed

    Yasuhiro Okamoto, Zhiyong Ouyang, Akira Okada

    Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXI   11676   116760P-1 - 116760P-7   2021.3

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    DOI: 10.1117/12.2584895

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  • Surface Profile Variation of Periodic Surface Nanostructures Produced by Ultrashort Pulsed Laser for Enhancement of Cell Orientation Reviewed International journal

    Togo Shinonaga, Shouno Kinoshita, Yasuhiro Okamoto, Akira Okada

    International Journal of Electrical Machining   26 ( 26 )   54 - 59   2021.3

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    DOI: 10.2526/ijem.26.54

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  • Development of Cu-Zr Wire Electrode for High-performance Fine Wire EDM Reviewed International journal

    Shizian Liu, Masato Miyoshi, Akira Okada, Naokuni Muramatsu, Kazuhiko Nomura

    International Journal of Electrical Machining   ( 26 )   40 - 45   2021.3

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  • Highly Efficient Surface Repairing of AMed Metal Parts by Large-area EB Irradiation Reviewed International journal

    Togo Shinonaga, Taisei Watanabe, Atsushi Yamaguchi, Akira Okada

    Procedia CIRP   95   976 - 980   2021.1

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    DOI: 10.1016/j.procir.2020.02.282

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  • Clarification of Temperature Distribution for Metals with Different Thermal Conductivity in Large-area Electron Beam Irradiation Reviewed International journal

    Shoya Ota, Tsubasa Sakai, Togo Shinonaga, Yasuhiro Okamoto, Akira Okada

    Procedia CIRP   95   960 - 965   2021.1

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    DOI: 10.1016/j.procir.2020.02.280

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  • Fundamental Study on Internal Space Forming by EDM Reviewed International journal

    Yuta Inaba, Shuoxun Li, Atsushi Yamaguchi, Akira Okada

    Procedia CIRP   95   215 - 219   2021.1

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    J-GLOBAL

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  • Investigation on Surface Smoothing of Mold Material by Pulsed Laser Irradiation of 532 nm Reviewed International journal

    Kohei Umezu, Takuro Kozaki, Yasuhiro Okamoto, Akira Okada

    Procedia CIRP   95   879 - 884   2021.1

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    DOI: 10.1016/j.procir.2020.02.283

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  • Influence of Nozzle Jet Flushing on Working Fluid Flow and Wire Electrode in Trim-cut WEDM Reviewed International journal

    Hiroki Iwai, Tomonori Ebisu, Akira Okada, Haruya Kurihara

    Procedia CIRP   95   250 - 254   2021.1

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

    Yuya OMIYA, Kenji TOYOTA, Ryota NAKANISHI, Togo SHINONAGA, Tadashi SHIOTA, Akira OKADA, Masahiro FUJII

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   15 ( 4 )   JAMDSM0052 - JAMDSM0052   2021

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    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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  • Fundamental Study on High-speed Micro-grooving of Metal by Angled Irradiation of Single-mode CW Fiber Laser Reviewed International journal

    Tatsuhiko Sakai, Yasuhiko Okamoto, Chie Katayama, Hirofumi Imai, Akira Okada

    Applied Sciences   10 ( 23 )   Jan-33 - Nov-33   2020.12

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  • 高性能微細ワイヤ放電加工実現のための Cu-Zr ワイヤ電極の開発 Reviewed

    劉 世賢, 三好 雅人, 岡田 晃,村松 尚国,野村 和弘

    電気加工学会誌   54 ( 137 )   155 - 161   2020.11

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  • Release Resistance of Compression-molded Thermosetting Resin from EDMed Metal Mold Reviewed International journal

    Ryoji Kitada, Yuki Ikeuchi, Akira Okada

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-5-4   2020.11

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  • Study on High-efficiency and High-quality Micro-welding of Copper by Superposition of 532 nm and 1064 nm Lasers Reviewed International journal

    Shota Kawasaki, Yasuhiro Okamoto, Martin Ruthandi Maina, Akira Okada, Shin -ichi Nakashiba, Norio Nishi

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-6-2   2020.11

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  • Micro-welding Characteristics of Glass Plates with Gap by Picosecond Pulsed Laser Reviewed International journal

    Fujiwara Takumi, Zhiyong Ouyang, Yasuhiro Okamoto, Akira Okada

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-6-1   2020.11

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  • Development of Control Method by Variation Range of Gap Voltage in Multi-wire EDM Slicing with Group Power Supplying Reviewed International journal

    Tomoya Takegawa, Shusei Tabuchi, Yasuhiro Okamoto, Akira Okada, Haruya Kurihara

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-5-1   2020.11

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  • Fundamental Study on Micro-edge Filleting by Using Large-area Electron Beam Irradiation Method Reviewed International journal

    Zehua Zhou, Tsubasa Sakai, Togo Shinonaga, Akira Okada

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-6-4   2020.11

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  • Fundamental Study on Double-Layered Surface Formation by Electrical Discharge Machining Reviewed International journal

    Yuki Ikeuchi, Shun-ichiro Tsuetani, Ryoji Kitada, Akira Okada

    Proceedings of the 18th International Conference on Precision Engineering (ICPE2020)   B-5-5   2020.11

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  • Fundamental Study on High-Speed Surface Processing of Metal by Angled Irradiation of Single-Mode CW Fiber Laser Reviewed International journal

    Tatsuhiko Sakai, Chie Katayama, Hirofumi Imai, Yasuhiko Okamoto, Akira Okada

    Proceedings of 39th International Congress on Applications of Lasers & Electro-Optics 2020   2020.10

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  • Fundamental Study on Reduction of Dross in Fiber Laser Cutting of Steel by Shifting Nozzle Axis Reviewed International journal

    Atsushi Yagi, Seigo Kadonaga, Yasuhiro Okamoto, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa, Rio Fujita, Akira Okada

    Proceedings of 39th International Congress on Applications of Lasers & Electro-Optics 2020   2020.10

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  • Alumina film sputter deposition on mold steel by large-area electron beam irradiation Reviewed International journal

    Togo Shinonaga, Masashi Takata, Motohiro Inoue, Akira Okada

    International Journal of Precision Engineering and Manufacturing-Green Technology   s40684-020-00243-1   2020.7

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  • Evaluation of Mechanical Strength at High Energy Conditions in Micro-joining of Glass by Picosecond Pulsed Laser Reviewed International journal

    Zhiyong Ouyang, Takumi Fujiwara, Yasuhiro Okamoto, Akira Okada

    Technical Digest of the 21st International Symposium on Laser Precision Microfabrication (LPM2020)   2020.6

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  • ワイヤ放電加工におけるノズルフラッシングがコーナ加工形状に及ぼす影響 Reviewed

    岩井 宏樹, 劉 世賢, 蛭子 奉紀, 岡田 晃, 栗原 治弥

    精密工学会誌   86 ( 6 )   480 - 485   2020.6

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  • Fundamental study on formation of internal space shapes by EDM Reviewed

    Yuta INABA, Shuoxun LI, Atsushi YAMAGUCHI, Akira OKADA

    Transactions of the JSME (in Japanese)   86 ( 892 )   20 - 00205   2020.6

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

    DOI: 10.1299/transjsme.20-00205

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  • Fundamental study on fine wire EDM characteristics using γ-phase brass coated steel wire Reviewed

    Masato MIYOSHI, Shixian LIU, Akira OKADA, Akihito HOSHIMA, Masatoshi KUITA

    Transactions of the JSME (in Japanese)   86 ( 892 )   20 - 00213   2020.6

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    DOI: 10.1299/transjsme.20-00213

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  • Fundamental Investigation on EDM Characteristis of Lanthanum Hexaboride Reviewed International journal

    Yuki Ikeuchi, Keita Fujii, Akira Okada

    International Journal of Electrical Machining   ( 25 )   27 - 32   2020.3

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  • Effect of Numerical Aperture on Molten Area Characteristics in Micro-joining of Glass by Picosecond Pulsed Laser Reviewed International journal

    Yasuhiro Okamoto, Zhiyong Ouyang, Takumi Fujiwara, Akira Okada

    Welding in the World   64 ( 6 )   937 - 947   2020.3

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  • Fundamental Study on Machining of Internal Space Shapes by EDM Reviewed International journal

    LI Shuoxun, 因幡勇汰, 岡田晃, 山口篤

    日本機械学会生産加工・工作機械部門講演会(CD-ROM)   13th   B22   2019.11

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    J-GLOBAL

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  • Fundamental investigation on EDM characteristics of lanthanum hexaboride applied for electron emission parts Reviewed International journal

    Keita Fujii, Yuta Ikeuchi, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B25   2019.11

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  • Fundamental study on fine wire EDM characteristics using γ-phase brass coated steel wire Reviewed International journal

    Masato MIYOSHI, Shixian LIU, Akira OKADA, Akihito HOSHIMA, Masatoshi KUITA

    Transactions of the JSME (in Japanese)   86 ( 892 )   B23 - 00213   2019.11

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    DOI: 10.1299/transjsme.20-00213

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  • Investigation on Laser Drilling Process of Solid Metal on Its Liquid and Detection Method of Penetration State Reviewed International journal

    Chikako Kawasaki, Yasuhiro Okamoto, Nozomi Taura, Tatsuhiko Sakai, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B02   2019.11

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  • Fundamental Investigation on Reduction of Surface Roughness for Mold Material by μs Pulsed Laser of 532 nm Reviewed International journal

    Takuro Kozaki, Yasuhiro Okamoto, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B01   2019.11

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  • Change of Thickness of Removal and Modifed layers on Workpiece with Different Material Property by Larg-area EB irradiation Reviewed International journal

    Tsubasa Sakai, Shoya Ota, Togo Shinonaga, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B09   2019.11

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  • Fundamental Study on Surface Damage Repairing of AMed Metal Parts by Large-area Electron Beam Irradiation Reviewed International journal

    Taisei Watanabe, Togo Shinonaga, Atsushi Yamaguchi, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B06   2019.11

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  • Influence of Surface Temperature Field in Large-area Electron Beam Irradiation on Wear Resistance of Zirconia Reviewed International journal

    Togo Shinonaga, Tsubasa Sakai, Motohiro Inoue, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B08   2019.11

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  • Influence of Initial Surface State on Shape Change of LIPSS Reviewed International journal

    Yuki Wada, Togo Shinonaga, Yasuhiro Okamoto, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B06   2019.11

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  • Investigation of Micro-grooving of Metals by High-speed Scanning of CW Laser Reviewed International journal

    Chie Katayama, Yasuhiro Okamoto, Tatsuhiko Sakai, Seigo Kadonaga, Akira Okada

    Proceedings of 8th International Conference of Asian Society for Precision Engineering and Nanotechnology   B04   2019.11

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  • ワイヤ放電加工における加工粉排出向上のためのノズル噴射法の検討 Reviewed

    蛭子 奉紀, 岡田 晃, 栗原 治弥

    日本機械学会論文集   85 ( 880 )   19 - 224   2019.11

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  • Effective Supplying Method of Shielding Gas in Vertical-position Laser Welding of Pure Titanium Reviewed International coauthorship International journal

    Yasuhiro Okamoto, Kyo Kitagawa, Seigo Kadonaga, Akira Okada, Esther T. Akinlabi, Sisa Pityana

    Proceedings of 38th International Congress on Applications of Lasers & Electro-Optics 2019   M2020   2019.10

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  • Influence of numerical aperture on molten area formation in fusion micro-welding of glass by picosecond pulsed laser Reviewed International journal

    Z. Ouyang, Y. Okamoto, Y. Ogino, T. Sakagawa, A. Okada

    Applied Sciences   9 ( 7 )   1412-1 - 1412-16   2019.7

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  • Creation of Smooth and Flat Surface in Micro-machining of Monocrystalline Diamond by Pulsed Laser Reviewed International journal

    Yasuhiro Okamoto, Takahiro Shimose, Atsuya Kajitani, Akira Okada

    Proceedings of Laser in Manufacturing 2019   220   2019.6

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  • Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    85 ( 4 )   359 - 364   2019.4

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    DOI: 10.2493/jjspe.85.359

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  • Surface Characteristics of Molding Die Treated by Electron Beam Irradiation Reviewed International journal

    Yoshihito HAGIHARA, Masaaki SANO, Akira OKADA

    International Journal of Electrical Machining   ( 24 )   13 - 20   2019.3

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  • Investigation of Separation Method for Gallium Nitride with Internal Modified Layer by Ultrashort Pulsed Laser Reviewed International journal

    Yasuhiro Okamoto, Motoki Ota, Akira Okada

    International Journal of Electrical Machining   24 ( 24 )   27 - 32   2019.3

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    DOI: 10.2526/ijem.24.21

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  • Study on Improvement of Wear Resistance for Zirconia by Large-area Electron Beam Irradiation Reviewed International journal

    Togo Shinonaga, Mitsuhiro Kimura, Motohiro Inoue, Akira Okada

    International Journal of Electrical Machining   ( 24 )   21 - 26   2019.3

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  • High surface quality micro machining of monocrystalline diamond by picosecond pulsed laser Reviewed International journal

    Y. Okamoto, A. Okada, A. Kajitani, T. Shinonaga

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   68 ( 1 )   197 - 200   2019

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    In micro machining of monocrystalline diamond by pulsed laser, unique processing characteristics appeared only under a few ten picosecond pulse duration and a certain overlap rate of laser shot. Cracks mostly propagate in parallel direction to top surface of workpiece, although the laser beam axis is perpendicular to the surface. This processed area can keep diamond structure, and its surface roughness is smaller than R-a = 0.2 mu M. New laser micro machining method to keep diamond structure and small surface roughness is proposed. This method can contribute to reduce the polishing process in micro machining of diamond. (C) 2019 Published by Elsevier Ltd on behalf of CIRP.

    DOI: 10.1016/j.cirp.2019.04.119

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  • Influence of magnetic property for workpiece on thickness of removal and modified layers in large-area EB irradiation Reviewed International journal

    85 ( 880 )   19-00227   2019

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    J-GLOBAL

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  • Effects of Concave Shape on Absorption Rate and Molten Volume in Micro-welding of Copper by Pulsed Nd:YAG Laser Reviewed

    Kazuki Hamada, Martin Maina, Reiki Inoue, Yasuhiro Okamoto, Akira Okada, Norio Nishi, Shin-ichi Nakashiba, Tomokazu Sakagawa

    Proceedings of the 17th International Conference on Precision Engineering (ICPE2018)   B-6-2   2018.11

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  • Improvement of Shape Accuracy in Multi-wire EDM Slicing of Semiconductor Ingot Reviewed International journal

    Takayuki Ikeda, Yasuhiro Okamoto, Haruya Kurihara, Akira Okada, Masataka Kido

    Proceedings of the 17th International Conference on Precision Engineering (ICPE2018)   B-5-18   2018.11

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  • Influence of Surface State in Micro-Welding of Copper by Nd:YAG Laser Reviewed

    Martin Ruthandi Maina, Yasuhiro Okamoto, Reiki Inoue, Shin-ichi Nakashiba, Akira Okada, Tomokazu Sakagawa

    Applied Sciences   8 ( 12 )   Jan-64 - Mar-64   2018.11

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  • Investigation of Assist Gas Flow to Improve Slope Angle of Kerf in Thick Plate Cutting of Mild Steel by Fiber Laser Reviewed

    Kyo Kitagawa, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Akihiko Sugiyama, Hironobu Miyoshi, Ryohei Ito

    Proceedings of 37th International Congress on Applications of Lasers & Electro-Optics 2018   M1305   2018.10

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  • Improvement of Slope Angle of Kerf in Thick Plate Cutting of Mild Steel by Fiber Laser Reviewed

    Kyo Kitagawa, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Akihiko Sugiyama, Hironobu Miyoshi, Ryohei Ito

    Proceedings of 37th International Congress on Applications of Lasers & Electro-Optics 2018   P115   2018.10

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  • Investigation on Osteoconductivity of EDMed Titanium Alloy Surface in Deionized Water Reviewed

    Yuta lida, Keita Fujii, Togo Shinonaga, Akira Okada

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   180 - 184   2018.9

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  • Fundamental Study on Curved Hole by EDM Drilling Using a Suspended Ball Electrode into Practical Materials Reviewed

    Kohei Ota, Shuoxun Li, Akira Okada, Yasuhiro Okamoto, Atsushi Yamaguchi

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   283 - 287   2018.9

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  • Influence of Molten Area on Joining Strength in Micro-welding of Glass by Picosecond Pulsed Laser Reviewed

    Yuta Ogino, Zhiyong Ouyang, Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   194 - 198   2018.9

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  • High-speed Wire EDM by Newly Developed Copper-Zirconium Wire Electrode Reviewed

    Ayaka Kuwada, Naokuni Muramatsu, Kazuhiro Nomura, Yasuhiro Okamoto, Akira Okada

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   185 - 189   2018.9

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  • Study on Improvement of Wear Resistance for Zirconia by Large-area EB Irradiation Reviewed

    Togo Shinonaga, Mitsuhiro Kimura, Motohiro, Inoue, Akira Okada

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   190 - 193   2018.9

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  • Smoothing of Hole Bottom Surface by Guiding Electron Beam with Magnet Reviewed

    Mituhiro Kimura, Togo Shinonaga, Motohiro Inoue, Akira Okada

    Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies   26 - 30   2018.9

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  • High Surface Quality Welding of Aluminum Using Adjustable Ring-mode Fiber Laser Reviewed

    Martin Ruthandi Maina, Yasuhiro Okamoto, Akira Okada, Matti N?rhi, Jarno Kangastupa, Jorma Vihinen

    Journal of Materials Processing Technology   258 ( 8 )   180 - 188   2018.8

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  • Stabilization of Fusion Micro-welding of Glass by Picosecond Pulsed Laser Reviewed

    Yasuhiro Okamoto, Yuta Ogino, Togo Shinonaga, Akira Okada

    International Conference on Processing and Manufacturing of Advanced Materials (THERMEC '2018)   2018.7

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  • Investigation of Surface Quality in High Speed Laser Welding of Aluminum Alloy using Adjustable Ring-mode Fiber Laser Reviewed

    Martin Ruthandi Maina, Yasuhiro Okamoto, Akira Okada, Matti N?rhi, Jarno Kangastupa, Jorma Vihinen

    2018 Sustainable Research and Innovation Conference   2018.5

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  • Influence of Intensity Distribution on Surface Quality in High Speed Laser Welding of Aluminum Alloy Reviewed

    Martin Ruthandi Maina, Yasuhiro Okamoto, Akira Okada, Matti N?rhi, Jarno Kangastupa, Jorma Vihinen

    TECHNICAL DIGEST of the Third Smart Laser Processing Conference, SLPCp8-P6, p.62   62   2018.4

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  • Control of Kerf Width in Multi-wire EDM Slicing of Semiconductors with Circular Section Reviewed

    Yasuhiro Okamoto, Takayuki Ikeda, Haruya Kurihara, Akira Okada, Masataka Kido

    Procedia CIRP   68   100 - 103   2018.4

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  • Study on Improvement of Wear Resistance for Zirconia by Large-area Electron Beam Irradiation Reviewed

    Togo Shinonaga, Yasuaki Kimura, Tsubasa Sakai, Akira Okada

    Procedia CIRP   68   178 - 183   2018.4

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  • Influence of Jet Flushing on Corner Shape Accuracy in Wire EDM Reviewed

    Tomonori Ebisu, Akiyoshi Kawata, Yasuhiro Okamoto, Akira Okada, Haruya Kurihara

    Procedia CIRP   68   104 - 108   2018.4

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  • Magnetic fixtures for enhancement of smoothing effect by electron beam melting Reviewed

    Togo Shinonaga, Akira Okada, Hao Liu, Mitsuhiro Kimura

    Journal of Materials Processing Technology   254   229 - 237   2018.4

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    In large-area electron beam (EB) irradiation method developed recently, high energy density EB can be obtained without focusing the beam. Therefore, large-area EB of 60 mm in diameter can be used for instant melting and evaporation of the wide area material surface, and high efficient surface finishing is possible. However, if the workpiece has a hole shape, the EB concentrates in the entrance edge or inside wall of the hole. Thus, it is difficult to smooth the hole bottom surface. Previous study showed that the surface smoothing and micro-deburring effects for non-magnetic workpiece could be improved by setting a magnetic block under the workpiece, since the electrons tend to concentrate the magnetic block along magnetic lines. In this study, smoothing of hole bottom surface was experimentally investigated by setting a magnetic block under a workpiece in large-area EB irradiation. Expansion of smoothing area of the bottom surface was also tried by setting a through hole at the center of the magnetic block. It was clarified that wide area of hole bottom surface could be smoothed by large- area EB irradiation by setting the magnetic block under workpiece. The surface roughness decreased to less than 3.0 μmRz at the area of hole bottom surface. When the hole diameter was 20 mm and hole depth was less than 40 mm, smoothing area of 10 mm in diameter was obtained by using the magnetic block. Moreover, the smoothing area was sufficiently expanded by setting a through hole with an appropriate diameter in magnetic block.

    DOI: 10.1016/j.jmatprotec.2017.11.024

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  • Mold Releasability of EDM Finished Surface Using Powder Mixed Working Fluid Reviewed

    Ryoji Kitada, Keita Fujii, Ruixiang Wang, Akira Okada

    International Journal of Electrical Machining   ( 23 )   24 - 31   2018.3

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  • Influence of Pulse Duration on Effective Energy on Material Removal in Micro-processing of Mild Steel by Several Hundred Nanoseconds Pulsed Laser Reviewed

    Yasuhiro Okamoto, Mizuna Ito, Akira Okada, Togo Shinonaga

    International Journal of Electrical Machining   ( 23 )   38 - 44   2018

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  • Study on Variation of Burr Height in Micro-deburring with Large-area Electron Beam Reviewed

    Togo Shinonaga, Tsubasa Sakai, Yasuaki Kimura, Akira Okada

    International Journal of Electrical Machining   ( 23 )   45 - 50   2018

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  • Influence of material property on thickness of modified layer generated by large-area electron beam Reviewed

    Togo Shinonaga, Yasuaki Kimura, Tsubasa Sakai, Akira Okada

    19TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING   68   178 - 183   2018

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    In large-area electron beam (EB) irradiation method developed recently, high energy density of EB can be obtained without focusing the beam. Therefore, the wide area of material surface can be melted instantly, and high efficient surface finishing is possible. Moreover, surface functions such as corrosion resistance and water repellency of the metal molds were improved by the large-area EB irradiation, since thin resolidified layer was formed on the metal surface. It is expected that thick modified layer is effective to maintain their surface functions for long-term. Therefore, control and prediction of the modified layer thickness are important in order to obtain appropriate modified layer thickness on metals with different material properties. In this study, variations of modified layer thickness on metals with different material property are experimentally investigated. Furthermore, electron behavior during large-area EB irradiation is simulated by using an electron track analysis, and prediction of the modified layer thickness is tried with temperature distributions by using an unsteady heat conduction analysis. Experimental results show that the modified layer thickness increases with increasing energy density. The thickness with high relative permeability is larger than that with low one. Analytical results of the modified layer thickness in unsteady heat conduction analysis show quantitative agreement with experimental ones. Furthermore, the modified layer thickness on the metals with different thermal property and density is also discussed. Then, the modified layer thickness of metals with different material property can be predicted by using our unsteady heat conduction analysis model. (C) 2018 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.procir.2017.12.043

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  • Effects of Polarization Direction on Removal Characteristics of Silver Nanowire Transparent Conductive Film by Ultrashort Pulsed Laser Reviewed

    T. Shimose, Y. Okamoto, M. Oshita, N. Nishi, T. Shinonaga, A. Okada

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   12 ( 5 )   JAMDSM0100-1 - JAMDSM0100-5   2018

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  • Fundamental study on addition of osteoconductivity to titanium alloy surface by EDM Reviewed

    Togo Shinonaga, Yuta Iida, Ryota Toshimitsu, Akira Okada

    International Journal of Automation Technology   11 ( 6 )   869 - 877   2017.11

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    In recent years, one common cure for losses in joint function caused by osteoarthritis or rheumatoid arthritis is replacement with an artificial joint. For this reason, it is necessary to add osteoconductivity to artificial joint component surfaces that make contact with bone, thereby reducing the period of time necessary to fixate the bone tissue and the artificial joint component. With the intent of efficiently machining the joint shape by electrical discharge machining (EDM) and simultaneously formation of a surface with osteoconductivity, this study discusses the possibility of adding osteoconductivity to a titanium EDMed surface.

    DOI: 10.20965/ijat.2017.p0869

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  • Influence of Nozzle Jet Flushing on Wire Breakage in 1st-Cut Wire EDM from Start Hole Reviewed

    Akiyoshi Kawata, Akira Okada, Yasuhiro Okamoto, Haruya Kurihara

    Key Engineering Materials   749   45 - 50   2017.9

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  • Effects of pulse duration on removal characteristics of silver nanowire transparent conductive film by nanosecond pulsed laser Reviewed

    Norio Nishi, Yasuhiro Okamoto, Masafumi Oshita, Akira Okada, Togo Shinonaga, Tomokazu Sakagawa

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   240   255 - 261   2017.2

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    In laser processing of silver nanowire transparent conductive film covered with an acrylic resin layer, effects of pulse duration on electrical insulation and surface quality were experimentally investigated by using nanosecond pulsed laser. The minimum laser fluence to achieve the stable electrical insulation by removal of silver nanowire became small with decreasing the pulse duration, but shorter pulse duration showed drastic change of removal trace area of silver nanowires at the boundary region of laser fluence to change conductive state to insulation one. In contrast, longer pulse duration around 200 ns indicated almost constant small removal trace area of silver nanowires, and wide processing window to perform the stable electrical insulation with small removal trace area of silver nanowires can be expected by using a proper long pulse duration in nanosecond pulsed laser processing. (C) 2016 Elsevier B.V. All rights reserved.

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  • Improvement of curved hole EDM drilling performance using suspended ball electrode by workpiece vibration Reviewed

    A. Okada, A. Yamaguchi, K. Ota

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   66 ( 1 )   189 - 192   2017

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    Small-diameter curved hole EDM drilling method using a metal ball electrode suspended with flexible thin foil has been studied using zinc alloy with low melting point as workpiece material. In order to improve the drilling performance and to extend drillable hole depth for practical materials, such as aluminium alloy and steel, curved hole drilling with workpiece vibration was proposed in this study. The influences of discharge conditions and vibration amplitude on the machining characteristics were experimentally investigated. Various types of curved holes were successfully drilled in practical materials by EDM using the suspended ball electrode with workpiece vibration. (C) 2017 Published by Elsevier Ltd on behalf of CIRP.

    DOI: 10.1016/j.cirp.2017.04.125

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  • Study on clarification of large-Area eb irradiation phenomenon by electron track analysis Reviewed

    Yasuaki Kimura, Togo Shinonaga, Akira Okada

    Key Engineering Materials   749 ( 749 )   118 - 123   2017

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    In large-Area electron beam (EB) irradiation method, uniformly high energy density can be obtained without focusing the beam. Large-Area EB can be used for melting and evaporating metal surface instantly. It was clarified that high efficient surface finishing of metal mold steels, ceramics and cemented carbides was possible by the large-Area EB irradiation. Furthermore, the tip of convex shape was often rounded after large-Area EB irradiation with remarkable material removal at the tip. This phenomenon is probably caused due to the heat accumulation and electrons concentration at the tip. However, electrons behavior near the workpiece surface during large-Area EB irradiation has not yet been clarified. In this study, electron track analysis was conducted in order to clarify electrons behavior during large-Area EB irradiation. At first, analytical model of the large-Area EB irradiation apparatus was built. Then, the EB diameter on the workpiece surface was experimentally measured with different energy density in order to evaluate the accuracy of our analytical model. The calculated results of EB diameter were in good agreement with the experimental ones. In addition, the electrons concentration phenomenon at the tip of convex shape was clarified by calculating energy density distribution on the surface obtained with electron track analysis. The analytical results indicated that the energy density increased from edge to tip of convex shape, while the energy density was constant in the case of planar shape. Experimented results also showed that removal thickness increases with high relative permeability. These results were similar tendency to the energy density distribution. Therefore, electrons concentration on the tip could be simulated by the electron track analysis.

    DOI: 10.4028/www.scientific.net/KEM.749.118

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  • Influence of nozzle jet flushing on wire breakage in 1st-cut wire edm from start hole Reviewed

    Akiyoshi Kawata, Akira Okada, Yasuhiro Okamoto, Haruya Kurihara

    Key Engineering Materials   749 ( 749 )   130 - 135   2017

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    In wire EDM (electrical discharge machining) process, it is important to smoothly exclude debris and bubbles generated in the working gap for keeping stable performance. Much debris stagnation in the gap would cause frequent occurrence of discharge concentration and secondary discharge, which results in unstable machining performance, such as frequent wire breakage, low removal rate, and low shape accuracy. Therefore, a jet flushing of working fluid using upper and lower jet nozzles has been conventionally applied for excluding the debris and bubbles from the machined kerf. Nevertheless, it is well known that the wire often breaks when the machined kerf length is a few mm from the start hole in 1st-cut wire EDM. The influence of machined kerf length on the flow field, the debris exclusion, and the wire behavior caused with hydrodynamic force by the jet flushing should be made clear. In this study, variations of flow field in the kerf, the debris accumulation state and the wire deflection caused jet flushing with machined length were analytically investigated by CFD (computational fluid dynamics) and structural analysis when 1st-cut wire EDM was done from a small start hole. Moreover, the effects of machined kerf length on the wire deflection and wire breakage were discussed. Wire breakage frequency experiments showed that wire tended to frequently break at a certain machined kerf length, where the wire deflection rapidly increased and the debris residence time in the gap became long.

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  • Study on Reduction of Discoloration Area in Micro-drilling of Multi-layered Artificial Skin by Picosecond Pulsed Laser Reviewed

    Yasuhiro Okamoto, Akira Eguchi, Naoto Maeda, Akira Okada, Shogo Minagi, Qiuyue Pan, Keiji Jin, Goro Nishigawa

    International Journal of Electrical Machining   ( 22 )   8 - 13   2017

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  • Improvement of Surface Characteristics for Long Life of Metal Mold by EDM in Chromium Powder MixedWorking Fluid. Reviewed

    Ruixiang Wang, Ryoji Kitada, Ryota Toshimitsu, Akira Okada

    International Journal of Electrical Machining   ( 22 )   26 - 30   2017

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  • Cutting Performance of Boron-doped Diamond Coated Tools in Drilling of CFRP Reviewed

    Alexander SOLDATOV, Akira OKADA, Kensuke UEMURA, Hitoshi OGAWA

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), B13   B13   2017

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  • Influence of Pulse Duration on Effective Energy on Material in Nanosecond Pulsed Laser Processing of Mild Steel Reviewed

    Mizuna Ito, Togo Shinonaga, Yasuhiro Okamoto, Akira Okada

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), D10   D10   2017

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  • Effects of Polarization Directionon Removal Characteristics of Silver Nanowire Transparent Conductive Film by fs Pulsed Laser Reviewed

    Takahiro Shimose, Yasuhiro Okamoto, Masafumi Oshita, Norio Nishi, Togo Shinonaga, Akira Okada

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), D09   D09   2017

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  • Study on Shape Variation of Periodic Surface Nanostructures Produced with Ultrashort Pulse Laser for Control of Cell Spreading Direction Reviewed

    Shono Kinoshita, Togo Shinonaga, Yasuhiro Okamoto, Akira Okada

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), D07   D07   2017

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  • Low-visibility Processing of Silver Nanowire Transparent Conductive Film by Pulsed Laser Reviewed

    Yasuhiro Okamoto, Norio Nishi, Masafumi Oshita Takahiro, Shimose,Togo Shinonaga, Akira Okada, Tomokazu Sakagawa

    Proceedings of 36th International Congress on Applications of Lasers & Electro-Optics 2017, M202   M202   2017

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  • Fundamental Study on Slicing Method of Gallium Nitride by Ultrashort Pulsed Laser Reviewed

    Togo Shinonaga, Motoki Ota, Yasuhiro Okamoto, Akira Okada

    The 18th International Symposium on Laser Precision Microfabrication Prpgram & Techunical digest, We1-O-9, p.132   132   2017

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  • Multi-wire EDM slicing of semiconductors with group power supplying method Reviewed

    Yasuhiro Okamoto, Takayuki Ikeda, Haruya Kurihara, Akira Okada, Masataka Kido

    Proceedings of euspen's 17th International Conference, 183-184   183 - 184   2017

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  • Expansion of Smoothed Area on Hole Bottom Surface by Setting Magnetic Block in Large-area Electron Beam Irradiation Reviewed

    Togo Shinonaga, Mitsuhiro Kimura, Akira Okada

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), D33   D33   2017

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  • Formation of Chromium Carbide on Carbon Tool Steel by EDM in Powder Mixed Working Fluid Reviewed

    Ruixiang Wang, Yuta Iida, Ryoji Kitada, Akira Okada

    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21), D31   D31   2017

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  • Characteristics of spatter in micro-drilling of metal sheet by pulsed Nd: YAG laser Reviewed

    Yasuhiro Okamoto, Hibiki Yamamoto, Akira Okada

    International Journal of Automation Technology   10 ( 6 )   874 - 881   2016.11

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    In laser cutting and drilling process, molten material was scattered as spatter, which deteriorates the surface integrity of a workpiece because of the thermal damage. It is expected that the control of assist gas flow can reduce the adhesion of spatter. In order to investigate the improvement method of thermal damage due to the adhesion of spatter, it is required to clarify characteristics of spatter. Therefore, a method was developed to collect and analyze spatter based on the use of high-speed video cameras in the lasermicro-drilling process, and the characteristics of spatter movement were numerically investigated by CFD analysis. The scattering velocity and angle of the spatter were investigated by recognizing and tracking spatter with the high-speed video observation. The movement of spatter was observed by using two high-speed video cameras, and analyzed by using a two-direction tracking method, in which the 3D tracking lines of spatter particles were reconstructed in the forward and backward frames, and the actual trajectory of individual spatter particle was obtained by averaging those tracking lines. These measurements revealed that the initial velocity of spatter was mainly distributed from 52 m/s to 200 m/s with an average velocity of 129 m/s. The initial angle of spatter was mainly distributed between 0 and 30 degrees from the workpiece surface in the upward direction. There was little correlation between the initial velocity and angle of spatter. The diameter of spatter was mainly distributed from 1 µm to 4 µm with an average diameter of 3.7 µm. It is important to use the processing conditions achieving the smaller spatter diameter in order to reduce the thermal damage caused by spatter. Although coaxial assist gas flow has an influence on the spatter behavior, that time period is very short. Therefore, it is important to control the spatter behavior outside of the coaxial assist gas flow by using an additional gas flow to prevent the thermal damage to the workpiece surface.

    DOI: 10.20965/ijat.2016.p0874

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  • Prediction of rounding phenomenon at corner tips in large-area electron beam irradiation Reviewed

    Togo Shinonaga, Akira Okada, Tomoaki Miyoshi

    INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE   110 ( 110 )   18 - 26   2016.11

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    In large-area electron beam (EB) irradiation method, corner tip of workpiece is generally rounded since removal of material at the tip is done preferentially. Investigation of the shape change is necessary to clarify rounding phenomenon with irradiation of EB. In this study, the shape changes of corner tips were experimentally investigated by Scanning Electron Microscope (SEM) observation of the cross sections. Then, electron track analysis in the EB irradiation was conducted to clarify an electron concentration at the tip. Unsteady heat conduction analysis at the tip was also done with considering the EB concentration at the tip and an electron penetration effect into the surface. The shape changes were estimated by simulation of temperature distribution at the tips. Experimental results show that the curvature radius increases with shot number of EB. The estimated shape changes show quantitatively good agreement with the experimental ones. These results indicate that the rounding phenomenon at the tips by large area EB irradiation can be predicted by our electron track and unsteady heat conduction analysis model. (C) 2016 Elsevier Ltd. All rights reserved.

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  • Effect of focusing condition on molten area characteristics in micro-welding of borosilicate glass by picosecond pulsed laser Reviewed

    I. H. W. Nordin, Y. Okamoto, A. Okada, T. Takekuni, T. Sakagawa

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   122 ( 5 )   492   2016.5

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    The characteristics of the molten area are attributed not only by laser energy condition but also the focusing condition. In this study, a picosecond pulsed laser of 1064 nm in wavelength and 12.5 ps in pulse duration was used as a laser source for joining glass material. Influence of focusing condition on micro-welding of glasses was experimentally investigated by using an objective lens with and without spherical aberration correction, and its molten area was characterized. The usage of objective lens with spherical aberration correction led to a larger molten area inside the bulk material of glass even under the same pulse energy, which related to the efficient micro-welding of glass materials. In addition, an optical system with the spherical aberration correction led to a stable absorption of laser energy inside the bulk glass material, stabilizing the shape of molten area, which resulted in the reliable weld joint. On the other hand, breaking strength of the specimens with spherical aberration correction was higher than that without spherical aberration correction. Therefore, it is concluded that the focusing condition with spherical aberration correction led to the larger and stable molten area, which resulted in higher joining strength in micro-welding of glass materials.

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  • Thermo-Mechanical Analysis on Thermal Deformation of Thin Stainless Steel in Laser Micro-Welding Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada

    International Journal of Manufacturing, Materials, and Mechanical Engineering   6 ( 2 )   51 - 66   2016.4

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    In the present study, a three-dimensional finite element model has been developed to simulate the temperature, stress and deformation fields in continuous wave (CW) laser micro-welding of thin stainless steel sheet. The welding deformation was experimentally evaluated using a single-mode fiber laser with a high-speed scanning system. Application of developed thermal model demonstrated that the laser parameters, such as laser power, scanning velocity and spot diameter have a significant effect on temperature field and the weld pool. In the case of welding deformation, numerical simulation was carried out by an uncoupled thermo-mechanical model. The welding stress and deformation are generated by plastic deformation during the heating and cooling periods. It was confirmed that the residual stress is higher than yield strength and has strongest effect upon the welding deformation. The numerical simulated results have proved that the developed finite element model is effective to predict thermal histories, thermally induced stresses and welding deformations in the thin material.

    DOI: 10.4018/IJMMME.2016040104

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  • Effect of wavelength and pulse duration on laser micro-welding of monocrystalline silicon and glass Reviewed

    I. H. W. Nordin, Y. Okamoto, A. Okada, H. Jiang, T. Sakagawa

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING   122 ( 4 )   400   2016.4

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    Micro-welding characteristics of silicon and glass by pulsed lasers are described. In this study, four types of laser beam, which are nanosecond pulsed laser and picosecond pulsed laser of 532 and 1064 nm in wavelength, were used for joining monocrystalline silicon and glass. Influence of wavelength and pulse duration on micro-welding of monocrystalline silicon and glass was experimentally investigated under the same spot diameter, and the molten area of monocrystalline silicon and glass was characterized. Finally, the breaking strength was evaluated for the overlap weld joint with different pulse duration and wavelength. A splash area of molten silicon around the weld bead line was obvious in the nanosecond pulsed laser. On the other hand, there was no remarkable molten splash around the weld bead line in the picosecond pulsed laser. Breaking strength of specimens with 1064 nm wavelength was higher than with 532 nm wavelength in nanosecond laser, whereas breaking strength of laser-irradiated specimen by picosecond pulse duration was higher than that by nanosecond pulse duration. It is concluded that the combination of picosecond pulse duration and infrared wavelength leads to the stable molten area appearance of the weld bead and higher breaking strength in microwelding of glass and monocrystalline silicon.

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  • Study on the movement of wire electrode during fine wire electrical discharge machining process Reviewed

    Sameh Habib, Akira Okada

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   227 ( 227 )   147 - 152   2016.1

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    Wire movements and vibrations are one of the most important phenomena of wire electrical discharge machining (EDM) process. Unstable wire electrode behavior and large wire vibration amplitude during the process cause wire breakage, low shape accuracy and large machined surface roughness. In this study, direct observation using high-speed camera investigated the movements of tungsten wire electrode during fine wire EDM process. The results showed that the vibration amplitude and frequency depended mainly on the wire tension, and the amplitude direction. The amplitude in the direction parallel to the machining direction was a little larger than that in the perpendicular one. In addition, the backward deflection of wire could be confirmed even in fine wire EDM. Also, the wire vibration mode was analyzed, and it could be varied with the machining position of the thin workpiece, which possibly led to smaller wire amplitude. Furthermore the amplitude envelope of wire electrode during the process was clarified. (C) 2015 Elsevier B.V. All rights reserved.

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  • Influence of electrical discharge machining parameters on cutting parameters of carbon fiber-reinforced plastic Reviewed

    Sameh Habib, Akira Okada

    MACHINING SCIENCE AND TECHNOLOGY   20 ( 1 )   99 - 114   2016.1

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    Today the use of high-strength carbon fiber-reinforced plastics (CFRP) composite as a material for many engineering applications is showing an increasing demand in the industry. These composites are replacing the traditional use of steel because they offer many advantages such as very light weight, high strength, and high stiffness associated with good corrosion-resistant properties. Unfortunately, there is little technological knowledge on the electrical discharge machining (EDM) process of high-strength composite materials, especially about the CFRP. In this work, a study has made into the possibility of using EDM process as a means of machining CFRP composite. Various cutting conditions such as peak current, pulse-on time, pulse-off time and open-circuit voltage were selected to perform electrical discharge machining. The effect of electrode rotation was also studied. Optimum cutting conditions and machine settings for EDM were chosen for machining CFRP composites.

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  • Study on Metal Film Formation by Large-area Electron Beam Irradiation Reviewed

    Togo Shinonaga, Masashi Takata, Akira Okada, Sadao Sano

    International Journal of Electrical Machining   21 ( 21 )   7 - 12   2016

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  • Control of modicied surface layer thickness in pulsed large-area EB irradiation Reviewed

    Akira Okada, Togo Shinonaga, Motohiro Inoue

    Electrotechnica and Electronica   51 ( 5月6日 )   215 - 220   2016

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  • Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    Atsushi YAMAGUCHI, Akira OKADA, Tatsuya MIYAKE

    Journal of the Japan Society for Precision Engineering   82 ( 10 )   907 - 912   2016

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  • Investigation on Visibility of Drilled Hole in Laser Micro-drilling of Multi-layered Articicial Skin Reviewed

    Yasuhiro Okamoto, Kiichi Asako, Naoto Maeda, Akira Okada, Shogo Miyanagi, Qiuyue Pan, Keiji Jin, Goro Nishigawa

    International Journal of Electrical Machining   21 ( 21 )   13 - 17   2016

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  • Control of Surface Profile in Periodic Nanostructures Produced with Ultrashort Pulsed Laser Reviewed

    Togo Shinonaga, Shouno Kinoshita, Yasuhiro Okamoto, Akira Okada

    Proceedings of 35th International Congress on Applications of Lasers & Electro-Optics 2016 Paper#M601   601   2016

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  • Effects of Surface States on Light Absorption Characteristics in Micro-welding of Copper by Pulsed Nd:YAG laser Reviewed

    Reiki Inoue, Takuya Wada, Yasuhiro Okamoto, Akira Okada

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 2016 paper#P.66   66   2016

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  • Study on high efferent micro-deburring by large-area EB irradiation Reviewed

    Togo Shinonaga, Yasuaki Kimura, Akira Okada, Tomoaki Miyoshi

    Proceeding of the 16th international conference of the european society for precision engineering and nanotechnology paper#P.7.20   7   2016

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  • Investigation of Spatter Behavior in Micro-processing of Metal Sheet by Pulsed Laser Reviewed

    Yasuhiro Okamoto, Akira Okada, Hibiki Yamamoto, Kento Shirasaya, Jari Kolehmainen, Togo Shinonaga

    Technical Digest of the 17th International Symposium on Laser Precision Microfabrication (LPM2016)Paper#82   82   2016

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  • Insulation Characteristics and Visibility of Transparent Conductive Film Containing Silver Nanowires by Nanosecond Pulsed Laser Reviewed

    Masafumi Oshita, Norio Nishi, Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

    TECHNICAL DIGEST of the Second Smart Laser Processing Conference Paper#82   82   2016

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  • Fundamental Study on Separation Method of Gallium Nitride with Internal Modified Layer by Ultrashort Pulsed Laser Reviewed

    Motoki Ota, Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

    TECHNICAL DIGEST of the Second Smart Laser Processing Conference Paper#81   81   2016

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  • Effective Shielding Gas Supplying Method of Wide Area in Vertical-Position Laser Welding of Pure Titanium Reviewed

    Kazuo Yokohara, Yasuhiro Okamoto, Akira Okada, Hikotaro Ochiai, Ryosuke Kimura, Shozo Ono, Masayuki Akase

    TECHNICAL DIGEST of the Second Smart Laser Processing Conference Paper#67   67   2016

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  • Shape Change of Periodic Nanostructures Produced with Ultrashort Pulsed Laser on Titanium Surface Reviewed

    Togo Shinonaga, Shono Kinoshita, Yasuhiro Okamoto, Akira Okada

    TECHNICAL DIGEST of the Second Smart Laser Processing Conference Paper#52   52   2016

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  • High-speed Observation of Thin Wire Movement in Fine Wire EDM Reviewed

    Takuya Kamei, Akira Okada, Yasuhiro Okamoto

    18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII)   42 ( 42 )   596 - 600   2016

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    In this study, the movements of thin tungsten wire electrode during fine wire EDM were investigated by direct observation using a high-speed camera. The results showed that the amplitude in the direction parallel to the machining direction was a little larger than that in the perpendicular one. Also, the backward wire deflection could be confirmed even in fine wire EDM. Furthermore, the wire vibration mode was found out by frequency analysis and the vibration amplitude could be reduced by adjusting the workpiece position to the 3rd order node of the vibration. In addition, the amplitude envelope of wire electrode during the process was clarified. (C) 2016 The Authors. Published by Elsevier B.V.

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  • High-speed Observation of Molten Area Formation in Microwelding of Glass by Picosecond Pulsed Laser Reviewed

    Motoki Ota, Yasuhiro Okamoto, Imaduddin Helmi Wan Nordin, Togo Shinonaga, Akira Okada

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 2016 paper#P.67   67   2016

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  • Investigation of Nanocrystalline Diamond Coating on Cutting Tools for CFRP Reviewed

    Alexander SOLDATOV, Akira OKADA, Kensuke UEMURA

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 2016 paper#P.102   102   2016

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  • Fundamental Study onSmoothing of Hole BottomSurface by Large-area Electron Beam Irradiation Reviewed

    Hao Liu, Togo Shinonaga, Akira Okada, Motohiro Inoue

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 2016 paper#P.71   71   2016

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  • Formation of periodic nanostructures with femtosecond laser for creation of new functional biomaterials Reviewed

    Togo Shinonaga, Shono Kinoshita, Yasuhiro Okamoto, Masahiro Tsukamoto, Akira Okada

    18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII)   42 ( 42 )   57 - 61   2016

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    Pure Titanium (Ti) and Ti alloys are the most used biomaterials. However, they have problem for bioactivity because metals have no biofunction. Therefore, adding new function to Ti and Ti alloys are necessary. One method to add new function is the creation of periodic structures on the biomaterial surfaces, which can control cell spreading. Femtosecond laser is one of the useful tools for creating periodic nanostructures, which can be created on metals and semiconductors by self-organizing in the laser focusing spot. In our previous study, the nanostructures could be formed on the Ti plate by using the femtosecond laser with fundamental wavelength of 775 nm. The periodicities of the nanostructures on the Ti plate was approximately 590 nm, which was shorter than the laser wavelength. Cells tests indicated that cell spreading clearly occurs along the grooves of the nanostructures. However, the influence of the periods of the nanostructure on cell spreading has not yet been investigated. It is expected that the periods can be varied by changing laser parameters, such as pulse widths, laser wavelengths, laser fluences, and number of shots. In this study, the periodic nanostructures are created on the Ti plate surface by using the femtosecond laser with fundamental wavelength of 790 nm. Then, influence of the pulse width and number of shots on the periods is investigated. In the experiments, laser beam is focused and scanned on the Ti plate surfaces. The laser irradiated areas are analysed by using a scanning electron microscope (SEM).

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  • Improvement in Surface Characteristics by EDM with Chromium Powder Mixed Fluid Reviewed

    Ryota Toshimitsu, Akira Okada, Ryoji Kitada, Yasuhiro Okamoto

    18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII)   42 ( 42 )   231 - 235   2016

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    Surface finishing technology by EDM has recently progressed, and very small surface roughness can be readily obtained by controlling the electrical discharge conditions, or by using metal powder mixed working fluids. In addition, it was reported that EDMed surface using metal powder mixed fluids sometimes has high surface functions, such as high hardness, high corrosion resistance and so on. Therefore, the high functional EDM finished surface is well expected to be applied as a final metal mold surface. In this study, formation of chromium containing layer on the EDMed surface was tried by using chromium powder mixed fluid. Furthermore, the EDMed surface characteristics with chromium powder mixed fluid were experimentally evaluated. (C) 2016 The Authors. Published by Elsevier B.V.

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  • Influence of Pulse duration on Processing Characteristics of Transparent Conductive Film Containing Silver Nanowires by ns Pulsed Fiber Laser Reviewed

    Masafumi Oshita, Norio Nishi, Yasuhiro Okamoto, Akira Okada, Togo Shinonaga, Tomokazu Sakagawa

    18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII)   42 ( 42 )   62 - 66   2016

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    Processing characteristics of transparent conductive film containing silver nanowires by ns pulsed fiber lasers with various pulse duration were experimentally investigated in the view-points of insulating state and surface quality. The laser fluence achieving the insulation state became smaller with decreasing the pulse duration. Appearance of removed trace area of silver nanowires was varied by the pulse duration, and the removal area ratio of removed trace area to the whole one was evaluated to discuss the surface quality. Small removal area ratio and good insulation state could be performed at a wide processing window at long pulse duration of 200ns. (C) 2016 The Authors. Published by Elsevier B.V.

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  • Investigation of Shielding Gas Supplying Method in Vertical-position Laser Welding of Pure Titanium Reviewed

    Kazuo Yokohara, Yasuhiro Okamoto, Akira Okada, Hikotaro Ochiai, Ryosuke Kimura, Shozo Ono, Masayuki Akase

    18TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM XVIII)   42 ( 42 )   448 - 453   2016

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    Effective shielding method for a wide area is required in the vertical-position remote laser welding of pure titanium. Therefore, shielding effects of ring-type nozzles with two layers for a wide area were numerically and experimentally investigated in the vertical-position setup of workpiece with argon gas. Prevention of incoming air flow outside a ring-type nozzle is effective to increase mass fraction of argon gas. Mass fraction of argon gas could be increased using a ring-type nozzle, in which shielding gas is supplied by open-side injection ports of proper angle at a proper flow ratio of two jetting layers. (C) 2016 The Authors. Published by Elsevier B.V.

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  • Reduction of Discoloration Zone in Micro-drilling of Multi-layered Artificial Skin by Picosecond Pulsed Laser Reviewed

    Yasuhiro Okamoto, Togo Shinonaga, Akira Eguchi, Kiichi Asako, Naoto Maeda, Akira Okada, Shogo Minagi

    Proceedings of 35th International Congress on Applications of Lasers & Electro-Optics 2016 Paper#M701   701   2016

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  • Effect of surrounding gas condition on surface integrity in micro-drilling of SiC by ns pulsed laser Reviewed

    Yasuhiro Okamoto, Kiichi Asako, Norio Nishi, Tomokazu Sakagawa, Akira Okada

    APPLIED PHYSICS B-LASERS AND OPTICS   119 ( 3 )   509 - 517   2015.6

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    The influence of the surrounding gas conditions on the surface integrity in the micro-drilling of silicon carbide was experimentally investigated using ns pulsed laser of 266 nm wavelength. Moreover, micro-machining characteristics were observed using high-speed shutter and video cameras in the micro-drilling of silicon carbide. The size and intensity of the laser-induced plasma were larger, and the plasma affected area was larger and deeper in argon than that in air. Although the intensity of the plasma was lower in helium than that in other gases, the surface around the drilled hole was roughened by the spread of the plasma in the vicinity of the drilled hole. Debris was removed along the flow field generated by laser shot in the opposite direction to the laser irradiation. The gas flow behavior and the spectrum and intensity of the laser-induced plasma were influenced by the surrounding gas type and pressure. The appearance of plasma generation affected the surface integrity at the circumference of the drilled hole, and the surface integrity was improved by reducing the pressure.

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  • Influence of Bead Geometry on Weld Distortion in Laser Micro-welding of Thin Stainless Steel Sheet with High-speed Scanning Reviewed

    Yasuhiro Okamoto, Satoshi Matsuoka, Tadanori Otowa and Akira Okada

    International Journal of Electrical Machining   ( 20 )   9 - 15   2015

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  • Effect of Tilting Jet Flushing Nozzle on Wire EDM Performance Reviewed

    Takuro Konishi, Akira Okada, Yasuhiro Okamoto, Haruya Kurihara

    International Journal of Electrical Machining   ( 20 )   2 - 8   2015

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  • Experimental investigation on wire vibration during fine wire electrical discharge machining process Reviewed

    Sameh Habib, Akira Okada

    International Journal of Advanced Manufacturing Technology   ( 1433-3015 )   1 - 12   2015

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  • 矩形ファイバを用いたナノ秒パルスレーザによるZnO 膜の除去加工におけるレーザ光強度分布の影響(共著) Reviewed

    西則男, 岡本康寛, 横山豪人, 岡田晃, 中芝伸一, 酒川友一

    精密工学会誌   81 ( 11 )   1033 - 1038   2015

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    DOI: 10.2493/jjspe.81.1033

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  • Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    Atsushi YAMAGUCHI, Akira OKADA, Tatsuya MIYAKE, Toshiki IKESHIMA

    Journal of the Japan Society for Precision Engineering   81 ( 11 )   1039 - 1044   2015

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  • Study on applicability of large-area EB irradiation to micro-deburring Reviewed

    Tomoaki Miyoshi, Akira Okada, Yasuhiro Okamoto

    Key Engineering Materials   656-657 ( 656-657 )   369 - 374   2015

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    In a large-area electron beam (EB) irradiation method developed recently, high energy EB can be obtained without focusing the beam, and large-area EB with almost uniform energy density distribution of 60mm in diameter can be used for instantly melting and evaporating metal surface. Then, the surface smoothing and surface modification of metal molds made of steel, cemented carbide and ceramics can be performed efficiently. When the large-area EB is irradiated to a sharp edge, the material removal remarkably progresses at the edge due to the heat accumulation and EB concentration there, which leads to the edge rounding. Our previous study clarified that micro-deburring was also possible by using this phenomenon. Moreover, this method would be effective for removal of discontinuous micro burrs generated by thermal machining processes, such as EDM and laser cutting. In this study, the possibility to completely remove micro burrs generated in EDM was experimentally investigated. The difference in micro-deburring characteristics with the type of workpiece material was also investigated. As a result, the EDM micro burrs with a height of about up to 50μm could be completely removed by this method. Furthermore, it was made clear that the magnetic property of workpiece materials greatly influenced the deburring characteristics, and the thermal property such as melting point and thermal conductivity also did.

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  • Wire breakage and deflection caused by nozzle jet flushing in wire EDM Reviewed

    A. Okada, T. Konishi, Y. Okamoto, H. Kurihara

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   64 ( 1 )   233 - 236   2015

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    High flow rate in nozzle jet flushing is effective for smooth debris exclusion from the wire EDM gap, but this leads to large wire deflection and vibration, resulting in the wire breakage and low shape accuracy. In this paper, the influence of nozzle jet flushing on wire breakage was experimentally investigated with varying the machined kerf length and machining conditions. Furthermore, the flow fields and debris residence time in the kerf, hydrodynamic stress distributions acting on the wire, and wire deflections were numerically analyzed. Based on the analyzed results, the causes of wire breakage were discussed. (C) 2015 CIRP.

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  • Development of Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    Atsushi YAMAGUCHI, Akira OKADA, Tatsuya MIYAKE

    Journal of the Japan Society for Precision Engineering   81 ( 5 )   435 - 440   2015

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  • イオンビームによるステンレス鋼ナイフエッジのバリ取りと形状制御 Reviewed

    玉置 司, 岡田 晃, 植村 賢介, 宇野 義幸, 高木 利樹

    精密工学会誌   81 ( 5 )   446 - 451   2015

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  • Effects of focusing condition on micro-welding characteristics of borosilicate glass by picosecond pulsed laser Reviewed

    Tomohiro Takekuni, Yasuhiro Okamoto, Takahiro Fujiwara, Akira Okada, Isamu Miyamoto

    Key Engineering Materials   656-657 ( 626-657 )   461 - 467   2015

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    Glass materials are widely used in products such as optical components and semiconductor devices. In these products, precision welding techniques of glass are required to manufacture small and complicated shape. The laser welding method can perform the joining without an intermediate layer and an adhesive agent. In addition, an ultra-short pulse laser can reduce the heat affected zone with the high space accuracy. However, heating and cooling cycles are repeated even in the case of ultra-short pulsed laser. The temperature distribution and change of molten area are influenced not only by laser energy condition but also focusing condition. Therefore in this study, effects of focusing condition of laser beam on micro-welding characteristics of glass were experimentally investigated by using a picosecond pulsed laser. A usage of object lens with the spherical aberration correction led to a large molten area even at the same pulse energy, which related to the efficient welding of glass materials. An optical system with the spherical aberration correction led to stabilizing the shape of molten area, which resulted in the reliable weld joint.

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  • Study on surface characteristics of EDMed surface with nickel powder mixed fluid Reviewed

    Shuhei Iwasaki, Ryoji Kitada, Akira Okada, Yasuhiro Okamoto

    Key Engineering Materials   656-657 ( 656-657 )   375 - 380   2015

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    EDM finishing techn ology has progressed recently, and very small surface roughness can be obtained by controlling the electrical discharge conditions. Also, EDM using powder mixed fluids can improve the surface characteristics. Therefore, the EDM finished surface is highly expected to be applied as a final metal mold surface. In that case, the characteristics of EDMed surface affects the molding performance and the life of metal molds. As a new surface finishing method by EDM, the characteristics of EDMed surface using a nickel powder mixed fluid was experimentally discussed in this study, since nickel coatings have been widely applied to improve the corrosion resistance and the mold releasability of metal molds. Experimental analysis clarified that the resolidified layer containing nickel content could be formed on the surface by EDM in nickel powder mixed fluid. Also, the water repellency and the releasability of molded resin from the EDM finished surface could be improved.

    DOI: 10.4028/www.scientific.net/KEM.656-657.375

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  • Investigation of Laser Microdrilling Method for Multi-Layered Arti cial Skin Reviewed

    Kiichi Asako, Yasuhiro Okamoto, Akira Okada, Shogo Minagi, Naoto Maeda, Qiuyue Pan, Keiji Jin, Goro Nishigawa

    Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century   2015

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  • Smart laser micro-welding of difficult-to-weld materials for electronic industry Reviewed

    Y. Okamoto, N. Nishi, S. Nakashiba, T. Sakagawa, A. Okada

    LASER-BASED MICRO- AND NANOPROCESSING IX   9351   935102-1 - 935102-9   2015

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    It has been known that wavelength, power density, interaction time and material properties have great influence on processing characteristics in laser material processing, in which materials with higher reflectivity classify into difficult-to-weld materials. In electronic industry, aluminum alloy is widely used as structural components due to its high specific strength, and copper became an important material because of its excellent electrical conductivity. These materials have high reflectivity and high thermal conductivity, which results in instability of energy absorption and processing results. Therefore, welding defects might be noticed in the micro-joining of aluminum alloy and copper. In this paper, the smart laser micro-welding of difficult-to-weld materials such as aluminum alloy and copper were discussed. The combination of a pulsed Nd:YAG laser and a continuous diode laser could perform high-performance micro-welding of aluminum alloy. A pulsed Nd:YAG laser was absorbed effectively from the beginning of laser scanning by pre-heating Nd:YAG laser pulse with the superposition of continuous diode laser, and wide and deep weld bead could be obtained with better surface integrity. As for micro-welding of copper material, stable absorption state could be achieved using a pulsed green Nd:YAG laser, since its absorptivity showed almost constant values with change of power density. A longer pulse duration was effective to achieve not only high absorptivity but also low deviation of absorptivity. The pulse waveform with maximum peak at the early period and a long pulse duration led to stabilizing the penetration depth with less porosity.

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  • Fundamental Study on Metal Film Coating by Large-area EB Irradiation Reviewed

    Masashi Takata, Togo Shinonaga, Akira Okada, Motohiro Inoue, Sadao Sano

    Proceedings of 30th Annual Meeting of the American Society for Precision Engineering, Vol.62, pp.595-598   62   595 - 598   2015

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  • Evaluation of Molten Area in Micro-welding of Monocrystalline Silicon and Glass Reviewed

    Imaduddin Helmi Wan Nordin, Yasuhiro Okamoto, Isamu Miyamoto, Akira Okada

    Proceedings of 2nd International Manufacturing Engineering Conference 2015   2015

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  • Film Formation Mechanism in Alumina Coating by Large-area Electron Beam Irradiation Reviewed

    Masashi Takata, Togo Shinonaga, Yasuhiro Okamoto, Akira Okada, Motohiro Inoue, Sadao Sano

    Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century   595 - 598   2015

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    DOI: 10.1299/jsmelem.2015.8._1102-1_

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  • 1104 Fundamental Study on Curved Hole Drilling Method by EDM with Suspended Ball Electrode Reviewed

    Atsushi YAMAGUCHI, Akira OKADA, Tatsuya MIYAKE, Toshiki IKESHIMA

    Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21   2015.8 ( 0 )   _1104 - 1_   2015

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  • Investigation of Machining Con- trollabil lity in Multi-wire EDM Slicing with Group Power Supply- ing Method Reviewed

    Akitoshi Suzuki, Yasuhiro, Okamoto, Akira Okada, Haruya Kurihara, Masataka Kido

    Proceedings of the 8th International Conference on Leading Edge Manufac- turing in 21st Century   2015

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    DOI: 10.1299/jsmelem.2015.8._1101-1_

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  • High-quality and Reliable Removal Method of ZnO by ns Pulsed Fiber Laser with Square Core Optical Fiber Reviewed

    Norio Nishi, Yasuhiro Okamoto, Akira Okada, Shin-ichi Nakashiba, Tomokazu Sakagawa

    Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century   2015

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    DOI: 10.1299/jsmelem.2015.8._1203-1_

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  • Laser Micro-drilling of Multi-layered Arti cial Skin Reviewed

    Yasuhiro Okamoto, Norio Nishi, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada

    Proceedings of Lasers in Manufacturing Laser in Manufactring 2015   2015

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  • Effect of Focusing Condition on Micro-Welding Characteristic of Glass by ps Pulsed Laser Reviewed

    Yasuhiro Okamoto, Imaduddin Helmi Wan Nordin, Togo Shinonaga, Tomohiro Takekuni, Tomokazu Sakagawa, Akira Okada

    Proceedings of 34th International Congress on Applications of Lasers &Electro-Optics 2015, pp.244-249   244 - 249   2015

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  • Improvement of surface characteristics for long life of metal molds by large-area EB irradiation Reviewed

    Akira Okada, Yasuhiro Okamoto, Yoshiyuki Uno, Kensuke Uemura

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   214 ( 8 )   1740 - 1748   2014.8

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    This paper describes the applicability of large-area EB irradiation method to a new surface modification for metal molds. The previous papers clarified that the surface roughness on wide area uniformly decreased to less than 1 mu m Rz in a few minutes by the large-area EB irradiation. Therefore, the large-area EB irradiation method has high practicability as an efficient surface finishing process for metal molds, and then the EB irradiation equipment has already been introduced into the market for practical use. In this method called EB polishing, the surface material melts and a very thin resolidified layer is formed on the surface. In this paper, the surface structure of EB polished metal mold steel SKD11 was first observed by TEM, and also component analysis was carried out by EDX. Then it was found out that the crystal grain size became small and chromium carbide is uniformly rearranged in the layer. Next, using heat conduction analysis model considering the electron penetration on the surface, the temperature distribution was calculated. The results showed that the surface temperature rapidly raised over its melting point until the end of EB irradiation, and cooled down rapidly. As the important practical surface characteristics for long life of metal mold, resistance to corrosion, water repellency, and the releasability of molded resin from metal mold surface were evaluated. The corrosion resistance and the water repellency could be improved by EB polishing, since the surface structure changes and Cr content distributed uniformly on the surface. Also, the releasability of molded resin from the surface became better. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmatprotec.2014.02.028

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  • Formation of Internal Modified Line with High Aspect Ratio in Sapphire by Sub-nanosecond Pulsed Fiber Laser Reviewed

    Yasuhiro Okamoto, Tomohiro Takekuni, Akira Okada

    JOURNAL OF LASER MICRO NANOENGINEERING   9 ( 1 )   52 - 58   2014.3

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    The internal modification technique for a sapphire substrate using a sub-nanosecond pulsed fiber laser of 180 ps was experimentally investigated with a normal achromatic focusing lens of 20 mm focal length, and the possibility of a singulation method with this internal modification technique was discussed. The laser beam of 1060 nm was focused in sapphire substrate of 0.4 mm thickness by passing through GaN epitaxial layer grown on the top surface of the sapphire substrate, and the internal modification zone was generated from the stain-finished surface as the bottom surface of sapphire substrate. The laser beam was absorbed from the stain-finished bottom surface, and the absorption point moved in the axis of laser irradiation without moving the focusing optics. The narrow internal modified line less than 5 mu m in width with a high aspect ratio of more than 30 was successfully obtained only by one laser scanning irradiation from the epitaxial layer side. A sapphire wafer could be broken from the internal modified line with less damage of the epitaxial layer by a stress sufficiently smaller than the tensile strength of sapphire. The breaking strength and its dispersion became smaller with increasing number of laser scans.

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  • Fundamental study on releasability of molded rubber from mold tool surface Reviewed

    Akira Okada, Yasuhiro Okamoto, Adam Clare, Yoshiyuki Uno

    INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY   70 ( 5-8 )   1515 - 1521   2014.2

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    In compression or injection molding of rubber products, small pieces of residual rubber often remain on the metal mold surface after releasing the product. This is caused by excessive localized adhesion to the mold surface. Therefore, cleaning of metal mold surface must be often performed, which results in longer molding cycle time, and the lifetime of metal mold is often reduced. In this study, the separation forces between molded rubber and metal mold surfaces are measured with a tensile tester to evaluate the releasability of molded rubber from the metal mold surface. Mold surfaces treated by various surface coatings and surface modification methods including EB polishing were tested and compared. Experimental results show that the separation force between molded rubber and metal mold surfaces depends on the true contact area between them and the chemical composition of the metal mold surface. The separation force decreases with a decrease in contact area. The chromium content at the metal mold surface significantly reduces the separation force. EB polishing is one of the most effective surface treatments for metal molds since the real contact area can be decreased while also decreasing the surface roughness of the tool surface in a short time. Electron beam melting is also shown to be an effective method of distributing chromium uniformly on the metal mold surface.

    DOI: 10.1007/s00170-013-5415-x

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  • Singulation Characteristics of Semiconductor Package Using Pulse Fiber Laser and SHG:YAG Laser Reviewed

    Yasuhiro Okamoto, Ryoji Kitada, Akira Okada, Yoshiyuki Uno

    International Journal of Electrical Machining   ( 19 )   28 - 33   2014

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    DOI: 10.2526/ijem.19.28

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  • 連続発振半導体レーザ重畳パルスNd:YAGレーザを用いたアルミ合金の微細溶接におけるキーホール発現境界 Reviewed

    中芝 伸一, 岡本 康寛, 酒川 友一, 原田 昌宜, 岡田 晃

    精密工学会誌   80 ( 4 )   419 - 424   2014

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    DOI: 10.2493/jjspe.80.419

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  • Novel Micro-welding of Silicon and Glass by Ultrashort Pulsed Laser Reviewed

    Yasuhiro OKAMOTO, Isamu MIYAMOTO, Jorma VIHINEN, Akira OKADA

    Materials Science Forum   783-786 ( 783-786 )   2792 - 2797   2014

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    DOI: 10.4028/www.scientific.net/MSF.783-786.2792

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  • Study on Possibility of Micro-deburring by Large-area Electron Beam Irradiation Reviewed

    Hajime Yonehara, Akira Okada, Yasuhiro Okamoto

    International Journal of Electrical Machining   ( 19 )   22 - 27   2014

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    DOI: 10.2526/ijem.19.22

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  • Effect of Wavelength and Pulse Duration in Laser Micro-welding of Glass and Monocrystalline Silicon Reviewed

    I. H, W. Nordin, Y. Okamoto, I. Miyamoto, A. Okada

    Proceedings of the 15th International Symposium on Laser Precision Microfabrication (LPM2014)   2014

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  • Development of Simple Power Supplying System in Multi-wire EDM Slicing Method Reviewed

    Yasuhiro Okamoto, Akitoshi Suzuki, Atsushi Kimura, Akira Okada, Haruya Kurihara, Masataka Kido

    Proceedings of 29th Annual Meeting of the American Society for Precision Engineering 251-254   251 - 254   2014

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  • Characterization of Absorptivity in Micro-welding of Copper by Pulsed Green Nd:YAG Laser Reviewed

    Yasuhiro Okamoto, Shin-ichi Nakashiba, Takuya Wada, Tomokazu Sakagawa, Norio Nishi, Akira Okada

    Proceedings of 33rd International Congress on Applications of Lasers & Electro-Optics 2014 M805 In USB   2014

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  • Improvement of Gas Shielding Effect in Vertical-position Laser Micro-welding of Titanium Alloy Reviewed

    Kento Shirasaya, Yasuhiro Okamoto, Kazuo Yokohara, Shozou Ono, Ryousuke Kimura, Hikotaro Ochiai, Akira Okada

    Proceedings of 33rd International Congress on Applications of Lasers & Electro-Optics 2014 P154 In USB   2014

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  • Effect of Jet Flushing with Tilting Nozzle in Wire Electrical Discharge Machining Reviewed

    Akira Okada, Takuro Konishi, Yasuhiro Okamoto, Haruki Kurihara

    Proceedings of the 14th euspen International Conference, Vol.2, pp.446-452   2 ( 2 )   446 - 452   2014

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  • Investigation of Micro-welding Characteristics of Si and Glass by Picosecond Pulsed Laser Reviewed

    I. H, W. Nordin, Y. Okamoto, I. Miyamoto, A. Okada

    Proceedings of the First Smart Laser Processing Conference 2014 (SLPC2014) in Electro Proceedings   2014

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  • Effect of Surrounding Gas Condition on Surface Integrity in Micro-drilling of SiC by ns Pulsed Laser Reviewed

    Yasuhiro Okamoto, Kiichi Asako, Norio Nishi, Tomokazu Sakagawa, Akira Okada

    Technical Digest of 9th International Conference on Photo-Excited Processes and Applications、A107   2014

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  • Influence of Nozzle Jet Flushing on Wire Deflection and Breakage in Wire EDM Reviewed

    Takuro Konishi, Sameh Habib, Akira Okada, Yasuhiro Okamoto, Haruya Kurihara

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 178   2014

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  • Study on Surface Characteristics of EDMed Surface with Nickel Powder Mixed Fluid Reviewed

    Syuhei Iwasaki, Ryoji Kitada, Akira Okada, Yasuhiro Okamoto

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 177   2014

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  • Effects of Focusing Condition on Micro-welding Characteristics of Borosilicate Glass by Picosecond Pulsed Laser Reviewed

    Tomohiro Tekekuni, Yasuhiro Okamoto, Takahiro Fujiwara, Akira Okada, Isam Miyamoto

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 176   2014

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  • Study on Applicability of Large-area EB Irradiation to Micro-deburring Reviewed

    Tomoaki Miyoshi, Akira Okada, Yasuhiro Okamoto

    Proceedings of the International Conference on Machining, Materials and Mechanical Technologies IC3MT 174   2014

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  • Fundamental Study on Sputter Deposition of Ceramic Film by Large-area EB Irradiation Reviewed

    Shuhei Misumi, Akira Okada, Yasuhiro Okamoto

    Procedia CIRP   6   487 - 492   2013.4

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  • Micro-welding of High Thermal Conductive Material Aluminum-Graphite Composite by Pulsed Nd:YAG Laser Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno, Muhaizad Mukhtar

    JOURNAL OF LASER MICRO NANOENGINEERING   8 ( 1 )   90 - 96   2013.1

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    The development of advanced materials with superior high thermal properties and high specific strength has led to new metal matrix composites (MMCs) as a great attractive material in electrical and electronic industries. In order to manufacture more practical component from MMCs, a technique for joining MMCs to other similar composites or monolithic materials is strongly required. Therefore, the reliable and economic joining technique is investigated to increase the applications of MMCs. In this study, the overlap welding of pure aluminum and super thermal conductive (STC) aluminum-graphite composite was experimentally and numerically investigated by using a pulsed Nd: YAG laser. In order to discuss the welding of dissimilar materials with different thermophysical properties, the temporal change of heat input was controlled by arranging the laser pulse waveform. The porosities and bumps were observed as the remarkable weld defects in the welding process without a pulse control. On the other hand, the weld bead was largely free of defects, and a size of bump was relatively small with the appropriate controlled pulse waveform. It was clarified that the laser welded joint of an aluminum and a STC aluminum-graphite composite could be successfully achieved with the better weld penetration stability by the appropriate controlled pulse waveform.

    DOI: 10.2961/jlmn.2013.01.0018

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  • IMPROVING THE PRODUCTIVITY OF ELECTRICAL DISCHARGE MACHINING PROCESS BY USING MULTI-THIN ELECTRODES Reviewed

    Habib Sameh, Akira Okada, Yoshiyuki Uno

    MACHINING SCIENCE AND TECHNOLOGY   17 ( 1 )   110 - 128   2013.1

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    In the electrical discharge machining (EDM) process, thin tool-electrodes are constantly gaining much importance due to the growing demand for manufactured parts with more functional characteristics and with small geometrical dimensions for applications in many work fields. This article highlights the utilization of the EDM process using multi-thin tool-electrodes with diameters of 0.3, 0.5 and 1.0 mm and different lateral spaces (3.0 to 0.8 mm). This machining technology requires using more than one tool-electrode in the same time for fabrication of microholes with high process performance and productivity. One of the principal aims of the experimental investigations of this article is to determine the minimum lateral spacing required between tool-electrodes for reducing process costs under acceptable conditions related to the surface of the machined workpiece. Tool-electrode wear and material removal rate are investigated as result of these experiments under adjustment of different process parameters. The beneficial effects of this machining process are also highlighted. The first experimental results of EDM with multi-thin tool-electrodes indicate some technical and economical advantages as a machining process.

    DOI: 10.1080/10910344.2012.747916

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  • Evaluation of molten zone in micro-welding of glass by picosecond pulsed laser Reviewed

    Yasuhiro Okamoto, Isamu Miyamoto, Kristian Cvecek, Akira Okada, Kenta Takahashi, Michael Schmidt

    Journal of Laser Micro Nanoengineering   8 ( 1 )   65 - 69   2013.1

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    Glass materials have been widely used in optics, MEMS, electronics and biomedical applica-tions because of their excellent optical, mechanical and chemical properties. Fusion welding by ul-trashort pulsed laser has been proposed as a promising technique for glass joining, since joining can be accomplished without an intermediate layer and mechanical contact. However, to apply a fusion welding technique by ultrashort pulsed laser as a reliable joining method, it is important to under-stand the mechanical properties of the weld seam since glass materials are very sensitive to tempera-ture gradients. Therefore, a method of evaluating the weld seam in the fusion welding of glass by picosecond pulsed laser was discussed, and its mechanical strength was investigated. A larger opti-cal contact area had a great influence on the shear load of the weld seam, while a smaller optical contact area could reduce the influence of the contact area on the measurement of shear load. There-fore, it was important to reduce the optical contact area to accurately evaluate the shearing strength of weld seam. The mechanical strength of the weld seam reduced at a low pulse repetition rate. High bending strength and shear stress could be obtained at a proper pulse repetition rate.

    DOI: 10.2961/jlmn.2013.01.0013

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  • Neural network modeling for prediction of weld bead geometry in laser microwelding Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada

    Advances in Optical Technologies   ( 11 )   105 - 111   2013

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    Laser microwelding has been an essential tool with a reputation of rapidity and precision for joining miniaturized metal parts. In industrial applications, an accurate prediction of weld bead geometry is required in automation systems to enhance productivity of laser microwelding. The present work was conducted to establish an intelligent algorithm to build a simplified relationship between process parameters and weld bead geometry that can be easily used to predict the weld bead geometry with a wide range of process parameters through an artificial neural network (ANN) in laser microwelding of thin steel sheet. The backpropagation with the Levenberg-Marquardt training algorithm was used to train the neural network model. The accuracy of neural network model has been tested by comparing the simulated data with actual data from the laser microwelding experiments. The predictions of the neural network model showed excellent agreement with the experimental results, indicating that the neural network model is a viable means for predicting weld bead geometry. Furthermore, a comparison was made between the neural network and mathematical model. It was found that the developed neural network model has better prediction capability compared to the regression analysis model. © 2013 Mohd Idris Shah Ismail et al.

    DOI: 10.1155/2013/415837

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  • Investigation of Wire Movement in Fine Wire EDM by High Speed Observation Reviewed

    Akira OKADA, Sho ICHII, Yasuhiro OKAMOTO

    International Journal of Electrical Machining   ( 18 )   43 - 48   2013

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  • Influence of Polarization Plane on Groove Shape in Scribing of Sapphire by THG: YAG Laser Reviewed

    Yasuhiro OKAMOTO, Shin-ichi NAKASHIBA, Tomokazu SAKAGAWA, Akira OKADA, Yoshiyuki UNO

    International Journal of Electrical Machining   ( 18 )   49 - 54   2013

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  • Effect of cutting direction on machining of carbon fibre reinforced plastic by electrical discharge machining process Reviewed

    Sameh Habib, Akira Okada, Sho Ichii

    International Journal of Machining and Machinability of Materials   13 ( 4 )   414 - 427   2013

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    In this study, the electrical discharge machining (EDM) characteristics and its removal mechanism for one and two directional carbon fibre reinforced plastic (CFRP) composite was evaluated. Also, an investigation about the influence of carbon fibre direction to machining direction was discussed to attain high performance of EDM process. Then EDM characteristics with two different combinations of machining direction and carbon fibre direction were compared. EDM machining characteristics such as material removal rate, electrode wear rate, surface roughness and SEM images were determined. Experimental results clarified that the material removal mechanism in the EDM for one directional CFRP when the machining direction is perpendicular to the fibre direction is different from that in parallel machining. Also, the EDM machining for two directional CFRP is different from that for one direction. Therefore, efficient EDM for CFRP is possible by selecting appropriate machining direction to fibre direction and the type of CFRP according to its fibre direction. Copyright © 2013 Inderscience Enterprises Ltd.

    DOI: 10.1504/IJMMM.2013.054272

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  • 電子ビーム照射面に窒化処理を適用した金型綱の熱疲労特性について Reviewed

    萩原義人, 佐野正明, 岡田 晃

    電気加工学会誌   47 ( 115 )   88 - 96   2013

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  • プラズマ窒化処理がステンレス刃物の切断性能に及ぼす影響 Reviewed

    玉置 司, 岡田 晃, 植村賢介, 宇野義幸

    精密工学会誌   79 ( 10 )   950 - 955   2013

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  • Micro-welding of Aluminium Alloy by Superposition of Pulsed Nd:YAG Laser and Continuous Diode Laser Reviewed

    Yasuhiro Okamoto, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada

    The Paton Welding Journal   11 ( 11 )   105 - 111   2013

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  • Fundamental study on sputter deposition of ceramic film by large-area electron beam irradiation Reviewed

    S. Misumi, A. Okada, Y. Okamoto, M. Inoue

    PROCEEDINGS OF THE SEVENTEENTH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM)   6   486 - 491   2013

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    The sputter deposition of ceramic film on metal mold steel surface by large-area electron beam (EB) irradiation was discussed. The large-area EB has high energy density enough to generate plasma above the workpiece surface during the surface smoothing process, which causes the sputtering of target material set near the workpiece surface. The sputter deposition of target material with simultaneous surface melting and resolidification of workpiece surface by large-area EB would improve the adhesion between the deposited film and the workpiece. Short ceramic tube made of alumina or zirconia as a target was put on the substrate surface of steel, and large-area EB was irradiated to the surface. The workpiece surface component and structure after the irradiation were investigated using EDX and XRD analysis, in order to discuss the possibility of large-area EB irradiation as a new coating method. (C) 2013 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.procir.2013.03.053

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  • Numerical Study on Wire Deflection by Jet Flushing in Wire EDM Reviewed

    Kazuki Kuriyama, Akira Okada, Yasuhiro Okamoto

    Proceedings of 5th International Conference on Asian Society for Precision Engineering and Nanotechnology,   2013

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  • Novel Micro-welding of Silicon and Glass by Ultrashort Pulsed Laser Reviewed

    Yasuhiro Okamoto, Isamu Miyamoto, Jorma Vihinen, Akira Okada

    Proceedings of 8th International Conference on Processing and Manufacturing of Advanced Materials   2013

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  • Fundamental study on micro-deburring by large-area EB irradiation Reviewed

    Akira Okada, Hajime Yonehara, Yasuhiro Okamoto

    FIRST CIRP CONFERENCE ON BIOMANUFACTURING   5 ( 5 )   19 - 24   2013

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    In a large-area electron beam (EB) irradiation method developed recently, high energy EB can be obtained without focusing the beam. Then the large-area EB of 60mm in diameter with uniform energy distribution can be used for instant melting of metal surface. The previous studies clarified that the surface smoothing of metal mold made of steel, cemented carbide and ceramics can be performed efficiently. Also this method can be applied to the surface finishing of biomaterials, such as stainless steel and titanium alloy. In this method, the sharp edge is rounded to about half hundred microns in radius under relatively high energy density conditions, since the material removal remarkably progresses there due to the electron concentration and heat accumulation at the edge. In this study, the possibility of micro deburring was investigated by using the preferential edge removal effect in the large-area EB irradiation. Experimental results showed that the micro-deburring was possible by large-area EB irradiation, and the burr height decreased with increasing the energy density of EB and the number of irradiation. The burr of about 10 mu m generated in EDM could be removed completely. Furthermore, micro-burrs at the edge of several small holes could be removed at once. (C) 2013 The Authors. Published by Elsevier B. V.

    DOI: 10.1016/j.procir.2013.01.004

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  • Fundamental study on multi-wire EDM slicing of SiC by wire electrode with track-shaped section Reviewed

    A. Kimura, Y. Okamoto, A. Okada, J. Ohya, T. Yamauchi

    PROCEEDINGS OF THE SEVENTEENTH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM)   6 ( 6 )   232 - 237   2013

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    High efficient and precise slicing method is required for the slicing of silicon carbide ingot. The newly developed multi-wire electrical discharge slicing method would decrease the kerf width and the cracks generated on machined surface. However, much higher wire tension is required in order to reduce wire vibration and to perform a smaller kerf width. Thin wire electrode with round section does not have enough cross sectional area under the high wire tension condition. Therefore, a wire electrode with track-shaped section was proposed and applied to the wire EDM slicing of silicon carbide ingot. The running control of wire electrode with track-shaped section was experimentally investigated. The side support method with fixture plates could decrease the kerf width by brass coated steel wire electrode with track-shaped section. The parallel drawing type traverser and the short distance setting points of side support fixture plates could perform the smaller vibration of wire electrode with track-shaped section and the decrease of kerf width. (C) 2013 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.procir.2013.03.052

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  • Study on Movement of Thin Tungsten Wire Electrode during Fine Wire EDM Reviewed

    Naoki WATANABE, Akira OKADA, Yasuhiro OKAMOTO

    Proceedings of the 7th International Conference on Leading Edge Manufacturing in 21st Century, pp.369-372   369 - 372   2013

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  • Precise Prediction of Shape Change at Convex Corner by Large-area EB Irradiation Reviewed

    Koki KOYAMA, Akira OKADA, Yasuhiro OKAMOTO, Koji TABUCHI

    Proceedings of the 7th International Conference on Leading Edge Manufacturing in 21st Century, pp.358-365   358 - 365   2013

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  • Fundamental Study on Micro-welding of Copper by Green Pulsed YAG Laser Reviewed

    Sunao TAKAI, Shin-ichi NAKASHIBA, Yasuhiro OKAMOTO, Akira OKADA, Tomokazu SAKAGAWA

    Proceedings of the 7th International Conference on Leading Edge Manufacturing in 21st Century, pp.35-38.   35 - 38   2013

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  • Fundamental Characteristics of Spatter in Micro-drilling of Metal Sheet by Pulsed Nd:YAG Laser Reviewed

    Kento SHIRASAYA, Yasuhiro OKAMOTO, Akira OKADA

    Proceedings of the 7th International Conference on Leading Edge Manufacturing in 21st Century, pp.43-46.   43 - 46   2013

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  • Investigation of Micro-drilling Characteristics for SiC by Harmonics of YAG Laser Reviewed

    Shin URUSHIBATA, Yasuhiro OKAMOTO, Akira OKADA, Shin-ichi NAKASHIBA, Tomokazu SAKAGAWA

    Proceedings of the 7th International Conference on Leading Edge Manufacturing in 21st Century, pp.39-42.   39 - 42   2013

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  • Study on Releasability of Molded Resin from EDM Finished Surface with Metal Powder Mixed Fluid Reviewed

    Akira Okada, Ryoji Kitada, Shuhei Iwasaki, Yasuhiro Okamoto

    Proceedings of 28th Annual Meeting of the American Society for Precision Engineering   2013

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  • Singulation of Semiconductor Package by Superposition of Pulsed Fiber Laser and Green YAG Laser Reviewed

    Yasuhiro Okamoto, Kento Shirasaya, Ryoji Kitada, Akira Okada

    Proceedings of 32nd International Congress on Applications of Lasers & Electro-Optics 2013   829 - 835   2013

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  • Influence of weld bead geometry on thermal deformation in laser micro-welding Reviewed

    S. Matsuoka, Y. Okamoto, A. Okada

    PROCEEDINGS OF THE SEVENTEENTH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING (ISEM)   6 ( 6 )   492 - 497   2013

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    In this study, the thermal deformation of thin stainless steel sheet was investigated in the bead-on-plate welding by using a single-mode fiber laser with a Galvano scanning system. The numerical simulation was developed to calculate the temperature and stress fields, and its deformation characteristics were discussed. It was suggested that the specimen firstly deformed downward in the same direction of laser irradiation, and then deformed in the reversed direction after laser scanning. The final deformation angle in the negative direction, which is concave shape from the view direction of laser irradiation, was generated under the welding mode of conduction and quasi-penetration for 50 mu m thickness sheet. On the other hand, the positive angle of final deformation angle was obtained under full-penetration welding mode, and the extreme small distortion could be achieved by the proper weld bead geometry in micro-welding of thin sheet. It was also confirmed that the similar weld bead geometry was resulted in both quasi-penetration and full-penetration welding mode for 20 mu m thickness sheet, but the final deformation angle tendency was different in 50 mu m and 20 mu m specimen thickness. It was clarified that the welding deformation was influenced not only by weld bead geometry but also by specimen thickness. (C) 2013 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.procir.2013.03.054

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  • Investigation of Phenomenon in Removal Processing of TCO Film by ns Pulsed Fiber Laser Reviewed

    Takehito Yokoyama, Yasuhiro Okamoto, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada

    Proceedings of 5th International Conference on Asian Society for Precision Engineering and Nanotechnology,   2013

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  • Challenge to Development of Functional Multi-wire EDM Slicing Method Reviewed

    Yasuhiro Okamoto, Atushi Kimura, Akira Okada, Jun Ohya and Toshiyuki Yamauchi

    Key Engineering Materials   523-524   287 - 292   2012.11

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  • Study on Improvement in Surface Characteristics by Large-area EB Irraidation Reviewed

    Akira Okada, Tomohiro Fujita, Kouki Kouyama and Yasuhiro Okamoto

    Proceedings of the 15th International Machine Tool Engineers' Conference   66 - 67   2012.11

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  • Investigation on Micro-machining Characteristics and Phenomenon of Semiconductor Materials by Harmonics of Nd:YAG Laser Reviewed

    Takayuki Hirano, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno, Tomokazu Sakagawa and Shin-ichi Nakashiba

    Key Engineering Materials   516   36 - 41   2012.6

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  • Optimization of Nozzle Flushing Method for Smooth Debris Exclusion in Wire EDM Reviewed

    Takuya Fujimoto, Akira Okada, Yasuhiro Okamoto, Yoshiyuki Uno

    Key Engineering Materials   516   73 - 78   2012.6

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  • Direct micro-joining of flexible printed circuit and metal electrode by pulsed Nd:YAG laser Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno, Kentaro Ueoka

    International Journal of Precision Engineering and Manufacturing   13 ( 3 )   321 - 329   2012.3

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    Laser micro-welding has proven to be a very successful tool for micro-joining in the electrical and electronic industries, where the miniaturization, the high strength and the high heat resistance are constantly requested. Recently, a flexible printed circuit (FPC) is expected as a new connection technology between electrical conductors according to the improvements of reliability and controllability with the diversification of the design concept. In this technology, it is required to weld a several tens μm thickness of FPC and a several hundreds μm thickness of metal electrode. This material combination accompanies the difficulty to control the welding phenomenon due to the differences of thermal property and heat capacity. As a good alternative, laser micro-welding has advantages of non-contact tool, low heat distortion and consistent weld integrity. In this study, the overlap welding of thin copper circuit on a polyimide film and a thick brass electrode was experimentally and numerically investigated by using a pulsed Nd:YAG laser. In addition, the shearing stress of overlap welding was evaluated with and without the control of pulse waveform, which can provide a well-directed controlling of the heat input with high energy density. The results showed that a porosity was observed as the major weld defect in the welding process without a pulse control. However, the appropriate controlled laser pulse configuration of micro-welding could remove the weld defects in the molten zone, improve the weld penetration stability and increase the weld strength. The potential benefits of controlled pulse waveform were discussed for the direct laser micro-welding process. It is clarified that the direct laser micro-welding of a thin copper circuit on a polyimide film and a thick brass electrode could be successfully achieved by appropriate controlled pulse waveform and heat input. © KSPE and Springer 2012.

    DOI: 10.1007/s12541-012-0041-3

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  • Investigation on Micro-machining Characteristics and Phenomenon of Semiconductor Materials by Harmonics of Nd:YAG Laser Reviewed

    Takayuki Hirano, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno, Tomokazu Sakagawa, Shin-ichi Nakashiba

    PROCEEDINGS OF PRECISION ENGINEERING AND NANOTECHNOLOGY (ASPEN2011)   516 ( 516 )   36 - +   2012

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    Precision micro-machining without crack and heat affected zones is required in order to use high-performance materials such as silicon and silicon carbide, and it is expected that the higher harmonics of the Nd:YAG laser can perform precision micro-machining due to its high photon energy. However, even by using the harmonics of the Nd:YAG laser, a heat affected zone is inevitable due to the plasma generation. In order to reduce the influence of plasma on the processing results, it is important to understand the generation mechanism of plasma. Therefore, the laser induced plasma in micro-drilling of silicon carbide was observed by a high-speed shutter camera, and the influence of laser wavelength and surrounding conditions on the machining characteristics were experimentally investigated. The removal depth increased with decreasing wavelength and the surrounding gas pressure. The surface integrity was improved by the combination of shorter wavelength and reduced pressure conditions. The behavior of laser induced plasma was different from the wavelength of the laser beam and the surrounding gas pressure. Under atmospheric pressure conditions, the plasma grew greatly and affected the wider surface around the drilled hole with increasing wavelength. Under reduced pressure conditions, there was little difference in plasma size by wavelength, and the affected zone around the drilled hole became relatively smaller. It became clear. that a low surrounding gas pressure and shorter wavelength were important to obtain better surface integrity and highly efficient processing.

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  • Optimization of Nozzle Flushing Method for Smooth Debris Exclusion in Wire EDM Reviewed

    Takuya Fujimoto, Akira Okada, Yasuhiro OKamoto, Yoshiyuki Uno

    PROCEEDINGS OF PRECISION ENGINEERING AND NANOTECHNOLOGY (ASPEN2011)   516 ( 516 )   73 - +   2012

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    In a wire EDM using a thin wire electrode, better exclusion of debris from the machined kerf is important in order to maintain stable machining performance, since the area of spark generation is along a line and very small. When large amounts of debris stagnate in the gap, secondary discharges possibly occur and these discharges easily concentrate on the same location, which leads to unstable machining performance, wire breakage, low machining rate and a low shape accuracy.
    Conventionally, the exclusion of debris is carried out by jet flushing with an upper and lower nozzle. However, the flow field of machining fluid in the kerf due to the jet flushing and the effect of jet flushing conditions from the nozzles on debris exclusion have not yet been sufficiently examined. This study aims to clarify the flow field in the machined kerf by computational fluid dynamics (CM) and to propose new jet flushing methods for smooth debris exclusion in the wire EDM. The effects of workpiece thickness and machined kerf length on the flow field of working fluid in the kerf under conventional jet flushing conditions are discussed. Then, jet flushing with a tilting nozzle is proposed in order to decrease the debris stagnation area near the wire electrode. As a result, by using the tilting nozzle, removal rate can be improved because of the smooth debris exclusion.

    DOI: 10.4028/www.scientific.net/KEM.516.73

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  • Challenge to Development of Functional Multi-wire EDM Slicing Method using Wire Electrode with Track-shaped Section Reviewed

    Yasuhiro Okamoto, Atsushi Kimura, Akira Okada, Yoshiyuki Uno, Jun Ohya, Toshiyuki Yamauchi

    EMERGING TECHNOLOGY IN PRECISION ENGINEERING XIV   523-524 ( 523-524 )   287 - +   2012

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    A newly developed multi-wire electrical discharge machining (EDM) method would accomplish the high performance slicing of silicon and silicon carbide with a narrow kerf width under a clean process environment. However, the thinner wire is challenging process with a normal round shape wire electrode. Therefore, a new wire electrode with track-shaped section was proposed in order to satisfy both the narrow kerf width and the high wire tension even in the case of thin wire electrode. In this study, the running control of wire electrode with track-shaped section was experimentally investigated, and the possibility of proposed process was discussed. A brass coated steel wire electrode with track-shaped section of aspect ratio 1:2 could perform the smaller vibration and the stable running up to 300 m/min. The side support method with fixture plates could improve the running stability of brass coated steel wire electrode with track-shaped section and reduce the kerf width. The brass coated steel wire electrode with track-shaped section could accomplish the uniform and straight kerf shape by increasing the wire tension.

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  • プラズマ窒化処理がステンレス刃物鋼の表面性状に及ぼす影響 Reviewed

    玉置,植村, 岡田,宇野

    精密工学会誌   78 ( 1 )   72 - 76   2012

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    DOI: 10.2493/jjspe.78.72

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  • Influence of Surrounding Gas Type and Pressure Condition on Micro-drilling Characteristics of Silicon Carbide by Harmonices of Nd:YAG Laser Reviewed

    Yasuhiro Okamoto, Shin Urushibata, Akira Okada, Shin-ich Nakashiba Tomokazu Sakagawa

    Proc. of 31st International Congress on Applications of Lasers & Electro-Optics 2012, pp.1269-1276   1269 - 1276   2012

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  • Evaluation of Molten Zone in Micro-welding of Glass by Picosecond Pulsed Laser Reviewed

    Yasuhiro Okamoto, Isamu Miyamoto, Kristian Cvecek, Akira Okada, Kenta Takahashi, Michael Schmidt

    Proceedings of the 13th International Symposium on Laser Precision Microfabrication (LPM2012), On-line, #12-63   2012

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  • Velocity and Angle of Spatter in Fine Laser Processing Reviewed

    Yasuhiro Okamoto, Hibiki Yamamoto, Akira Okada, Kento Shirasaya, Jari Tapani Kolehmainen

    LASER ASSISTED NET SHAPE ENGINEERING 7 (LANE 2012)   39 ( 39 )   792 - 799   2012

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    Scattering velocity and angle of spatter were investigated by recognizing and tracking spatter with the high-speed video observation. The spatter movement was observed by two high-speed video cameras, and analyzed by twodirection tracking method, in which the 3D tracking lines of spatter were constructed in the forward and backward frames and the actual trajectory of individual spatter was obtained by averaging those tracking lines. It made clear that the initial velocity of spatter was less than the speed of sound and mainly ranged from 75m/s to 200m/s. The velocity of spatter showed the slight correlation with the angle. (C) 2012 Published by Elsevier B.V. Selection and/or review under responsibility of Bayerisches Laserzentrum GmbH

    DOI: 10.1016/j.phpro.2012.10.102

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  • Evaluation of Damaged Region at the Groove Edge of TCO Filim in Pulsed Fiber Laser Processing Reviewed

    Yasuhiro Okamoto, Naoya Tkahashi, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada

    Proc. of 31st International Congress on Applications of Lasers & Electro-Optics 2012, pp.860-865   860 - 865   2012

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  • Singulation of Sapphire Substrate with High Aspect Ration Internal Modification by Sub-nanosecond Pulsed Fiber Laser Reviewed

    Yasuhiro Okamoto, Kenta Takahashi, Akira Okada

    Proc. of 31st International Congress on Applications of Lasers & Electro-Optics 2012, pp.813-819   813 - 819   2012

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  • Effect of Plasma Nitriding on Cutting Performance of Stainless Steel Cutlery Reviewed

    Tsukasa Tamaoki, Akira Okada, Kensuke Uemura, Yoshiyuki Uno

    Proc. Of 12th International Conference of euspen, Vol.2, pp.266-270   2 ( 2 )   266 - 270   2012

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  • Micro-welding of Copper Plate by Frequency Doubled Diode Pumped Pulsed Nd:YAG Laser Reviewed

    Shin-ichi Nakashiba, Yasuhiro Okamoto, Tomokazu Sakagawa, Sunao Takai, Akira Okada

    LASER ASSISTED NET SHAPE ENGINEERING 7 (LANE 2012)   39 ( 39 )   577 - 584   2012

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    A pulsed laser of 532 nm wavelength with ms range pulse duration was newly developed by second harmonic generation of diode pumped pulsed Nd:YAG laser. High electro-optical conversion efficiency more than 13% could welding be achieved, and 1.5 kW peak power green laser pulse was put in optical fiber of 100 mu m in diameter. In micro-welding of 1.0 mm thickness copper plate, a keyhole welding was successfully performed by 1.0 kW peak power at spot diameter less than 200 mu m. The frequency doubled pulsed laser improved the processing efficiency of copper welding, and narrow and deep weld bead was stably obtained. (C) 2012 Published by Elsevier B. V. Selection and/or review under responsibility of Bayerisches Laserzentrum GmbH

    DOI: 10.1016/j.phpro.2012.10.076

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  • Novel Approach for Slicing of Silicon Carbide by Multi-wire EDM using Wire Electrode with Trackshaped Section Reviewed

    Yasuhiro Okamoto, Atsushi Kimura, Akira Okada, Jun Ohya, Toshiyuki Yamauchi

    Proceedings of American Society for Precision Engineering 2012 Annual Meeting, pp.331-334   331 - 334   2012

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  • High-performance Micro-welding of Aluminum Alloy by Combination of Pulsed Nd:YAG Laser And Continuous Diode Laser Reviewed

    Yasuhiro Okamoto, Shinichi Nakashiba, Tomokazu Sakagawa, Akira Okada

    Proceedings of Materials Science & Technology 2012 Conference, pp.332-339   332 - 339   2012

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  • APPLICABILITY OF REACTIVE ION ETCHING TO FABRICATION OF MICRO-PRISM-ARRAY FOR DIOPTRICS SYSTEM Reviewed

    Ryuto Fujie, Akira Okada, Yoshiyuki Uno

    PROGRESS OF MACHINING TECHNOLOGY   227 - +   2012

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    This study aims to develop a new lens system using an integrated arrangement of micro-prism-cell (MPC) and to obtain similar focusing performance as an optical lens. In this lens system, the respective prisms have different apex angle which is fabricated by precision processing. Further development of this system would make it possible to manufacture a multifocal lens in a small area, which leads to wide applications not only in optical devices, such as glasses and intraocular lenses, but also in pickup lenses for optical storage and so on. In this study, a new software was first developed to design a micro-prism-array (MPA), in which the apex angles of respective MPC were precisely computed. Based on the computed design, the photo-resist shape pattern was produced on trial by reactive ion etching (RIE). Then, the formation of a smooth prism slope was tried by using the resist mask whose shape was whittled away with an O-2 (oxygen) RIE. Then, as a preliminary experiment, the apex angle was experimentally optimized with varying the etching conditions. In the experiment, the size of each MPC was set to 10 mu m, and the formation of the MPC, which had different apex angles ranging from zero to about 15 degrees was achieved by four process stages of the RIE. A good focusing performance of the manufactured MPA could be obtained despite a diffusion of light. Nevertheless, the performance is not yet up to the specified design, and there remain some problems to be solved in order to achieve precise focusing performance with the MPA.

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  • HIGHT-SPEED OBSERVATION OF WIRE MOVEMENT IN FINE WIRE EDM Reviewed

    Sho Ichii, Akira Okada, Yasuhiro Okamoto

    PROGRESS OF MACHINING TECHNOLOGY   215 - 218   2012

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    In the wire EDM using a thin wire electrode, the reduction of wire vibration is important to achieve a high-precision machining, since large amplitude of wire vibration leads to large kerf width, low shape accuracy, rough machined surface and high risk of wire breakage. In this study, the movements of wire electrode are directly observed by using a high-speed video camera in order to clarify the wire vibration in fine wire EDM for thin workpiece. The results shows that the wire vibration amplitude during the process increases with wire running speed and flow rate of jet flushing but decreases with wire tension. Also, the wire behavior during process is almost 1st order string vibration. Furthermore, the wire vibration frequency increases with not only the wire tension but also the discharge pulse frequency.

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  • SURFACE MODIFICATION OF CEMENTED TUNGSTEN CARBIDE WITH NICKEL BINDER BY LARGE-AREA ELECTRON BEAM Reviewed

    Akira Okada, Shuhei Misumi, Yasuhiro Okamoto

    PROGRESS OF MACHINING TECHNOLOGY   207 - 210   2012

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    Cemented tungsten carbide with nickel binder is often applied to the metal mold for electronic parts due to its non-magnetic feature. However, it is difficult to use conventional methods applied to metal molds made of steel for the surface finishing or modification of cemented tungsten carbides in some cases. The large-area EB irradiation for conventional cemented tungsten carbide with cobalt binder was studied in our previous papers. In this paper, surface finishing and modification of cemented tungsten carbide with nickel binder were investigated, and the effects of EB conditions on the surface characteristics were discussed. The experimental results indicated that the surface roughness decreased and the surface glossiness increased by the large-area EB irradiation. Also, the water repellency and the releasability of molded resin from the surface could be improved under proper EB conditions.

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  • THERMAL DEFORMATION IN MICRO-WELDING OF THIN STAINLESS STEEL SHEET BY SINGLE-MODE FIBER LASER Reviewed

    Yasuhiro Okamoto, Satoshi Matsuoka, Mohd Idris Shah Ismail, Akira Okada

    PROGRESS OF MACHINING TECHNOLOGY   199 - 202   2012

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    In this study, the thermal deformation of thin stainless steel sheet in laser micro-welding were experimentally and numerically investigated. The welding deformation was experimentally evaluated using a single-mode CW fiber laser with a high-speed scanning system. The numerical simulation was developed to calculate the temperature, stress and deformation fields. It was clarified that the laser irradiation condition has a significant effect on the welding mode and stress field. In addition, the thermal deformation was influenced by the weld bead geometry and residual stress distributions, and the final deformation was formed by residual stress and plastic deformation. It was found that the tensile stress was generated around the molten zone and balanced by the compressive stress in the base material.

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  • Effects of Wire Surface Roughness on Wire EDM Characteristics Reviewed

    Akira OKADA Toshiyuki YAMAUCH, Masayuki HIGASHI, Masanori NAKAZAWA, Toshiaki SHIMIZU, Yoshiyuki UNO

    International Journal of Electrical Machining   ( 16 )   1 - 7   2011

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  • Experimental Investigation on Micro-Welding of Thin Stainless Steel Sheet by Fiber Laser Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno

    American Journal of Engineering and Applied Sciences   4 ( 3 )   306 - 312   2011

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  • Surface modification of cemented carbide by EB polishing Reviewed

    A. Okada, R. Kitada, Y. Okamoto, Y. Uno

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   60 ( 1 )   575 - 578   2011

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    Cemented carbide has many excellent properties. However, it is sometimes difficult to apply conventional surface finishing or surface modification methods for the cemented carbide. The possibility of surface modification by large-area electron beam irradiation, namely EB polishing was discussed. The surface structure of the EB polished cemented carbide was observed by TEM. The hardness and the water repellency were tested. Also, the separation force of molded resin from the surface was measured for evaluating the releasability of the resin. The water repellency and the releasability of the molded resin could be improved by EB polishing, because the surface structure changed. (C) 2011 CIRP.

    DOI: 10.1016/j.cirp.2011.03.107

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  • ワイヤ放電加工用高性能ワイヤ電極の開発に関する研究(第4報)-ワイヤ表面の高抵抗層が放電加工特性に及ぼす影響− Reviewed

    岡田 晃, 山内俊之, 中澤正典, 清水敏明, 宇野義幸

    電気加工学会誌   45 ( 109 )   64 - 70   2011

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    DOI: 10.2526/jseme.45.64

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  • Improvement of Razor Blade Surface Integrity by Plasma Nitriding Reviewed

    Tsukasa Tamaoki, Kensuke Uemura, Akira Okada, Yoshiyuki Uno(Kai, ustries Co, Ltd, Nagata SeikiCo

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Centur, in CD-ROM   2011

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  • Influence of Carbon Fiber Direction on EDM Characteristics of CFRP Reviewed

    Sho Ichii, Akira Okada, Yasuhiro Okamoto, Yoshiyuki Uno

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Centur, in CD-ROM   2011

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  • Clarification of Surface Layer Temperature in EB Polishing by Unsteady Heat Conduction Analysis Reviewed

    Tomohiro Fujita, Akira Okada, Yasuhiro Okamoto, Yoshiyuki Uno

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Centur, in CD-ROM   2011

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  • High-quality Dicing of Semiconductor Package by Superposition of Pulsed Fiber Laser and SHG:YAG Laser Reviewed

    Hibiki Yamamoto, Yasuhiro Okamoto, Muhamad Fahmi, bin Mohd Noor, Ryouji Kitada, Akira Okada

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Centur, in CD-ROM   2011

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  • Effects of Laser Wavelength and Intensity Distribution on Removal Characteristics of TCO Film Reviewed

    Naoya Takahashi, Yasuhiro Okamoto, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada, Yoshiyuki Uno, Kataoka Corpora

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Centur, in CD-ROM   2011

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  • Effect of Continuous Diode Laser on Crack Generation in Pulsed Nd:YAG Laser Welding of Aluminum Alloy Reviewed

    Kazuya Miura, Yasuhiro Okamoto, Shin-ichi Nakashiba, Tomokazu Sakagawa, Akira Okada, Yoshiyuki Uno, Kataoka Corpora

    Proceedings of International Conference on Leading Edge Manufacturing in 21st Century, in CD-ROM   2011

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  • Welding Characteristics of Aluminum Alloy by Pulsed Nd:YAG Laser with Pre- and Post-irradiation of Superposed Continuous Diode Laser Reviewed

    Shin-ichi Nakashiba, Yasuhiro Okamoto, Tomokazu Sakagawa, Kazuhiro Miura, Akira Okada, Yoshiyuki Uno, Kataoka Corpora

    Proceedings of 28th International Congress on Applications of Lasers & Electro-Optics 2011, pp.825-832   825 - 832   2011

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  • Micro-welding of high thermal conductive material aluminum-graphite composite by pulsed Nd:YAG laser Reviewed

    Mohd Idris Shah Ismail, Yasuhiro Okamoto, Akira Okada, Yoshiyuki Uno, Muhaizad Mukhtar

    Proceedings of the 12th International Symposium on Laser Precision Microfabrication (LPM2011), On-line, #11-056   2011

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  • 型彫り放電加工面の離型性に関する基礎的研究 -離型性に及ぼす要因の解明- Reviewed

    北田良二, 日置裕彦, 岡田 晃, 宇野義幸

    電気加工学会誌   44 ( 106 )   52 - 59   2010

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    DOI: 10.2526/jseme.44.52

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  • Evaluations of spark distribution and wire vibration in wire EDM by high-speed observation Reviewed

    A. Okada, Y. Uno, M. Nakazawa, T. Yamauchi

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   59 ( 1 )   231 - 234   2010

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    In fine wire EDM using thin wire electrode, uniform distribution of spark location is necessary to achieve stable machining performance. However, it is difficult to precisely evaluate the distribution of spark location by the conventional branched electric current method when the workpiece is thin. A new evaluation method by using a high-speed video camera is proposed. The locations of spark are measured by analyzing the recorded images. Then the effects of machining parameters, such as servo voltage, pulse interval time, wire running speed and others on the distribution of spark location are investigated. The possibility of evaluating the wire vibration is also discussed. (C) 2010 CIRP.

    DOI: 10.1016/j.cirp.2010.03.073

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  • 大面積電子ビーム照射による超微粒子超硬合金の表面処理 Reviewed

    北田良二, 岡田 晃, 宇野義幸, 郭 洪閣

    精密工学会誌   76 ( 12 )   1393 - 1397   2010

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    DOI: 10.2493/jjspe.76.1393

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  • Increase in Corrosion Resistance and Water Repellency of Metal Mold Surface by EB Polishing Reviewed

    Akira OKADA, Yoshiyuki UNO, Kensuke UEMURA

    Proc. of the 25th Annual Meeting of the American Society for Precision Engineering, 301-304   1   301 - 304   2010

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  • Unconventional Methods of Cutting of Bone and Tissue Reviewed

    J. A. McGeough, A. Okada

    PROCEEDINGS OF THE 16TH INTERNATIONAL SYMPOSIUM ON ELECTROMACHINING, 2010   1   457 - 461   2010

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    Unconventional methods of cutting based on ultrasonics, laser, and water jet mechanisms that might be used in orthopaedic surgery are discussed. Their advantages include no or little contact with bone or tissue that is to be cut, the application of less mechanical force compared to traditional techniques, and reduction in localised heat effect in the region undergoing surgical cutting. Their limitations and merits are identified.

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  • Surface Finishing of Cemented Carbide by Large-area EB Irradiation Reviewed

    Hongge Guo, Ryoji Kitada, Akira Okada, Yoshiyuki Uno

    PROCEEDINGS OF THE 16TH INTERNATIONAL SYMPOSIUM ON ELECTROMACHINING, 2010   1   451 - 454   2010

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    Cemented carbide has many excellent properties, such as high strength, high hardness and so on. However, it is difficult to apply conventional surface finishing or surface modification methods for the cemented carbide. In this paper, a new surface finishing by large-area electron beam (EB) irradiation is proposed, and the possibility of surface smoothing and surface modification was discussed. The experimental results clarified that high-efficient surface smoothing was possible under the proper EB conditions. The repellency and the releasability of molded resin could be improved by large-area EB irradiation.

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  • EDM Characteristics of Carbon Fiber Reinforced Plastic Reviewed

    Hai Wang, Sameh Habib, Akira Okada, Yoshiyuki Uno

    PROCEEDINGS OF THE 16TH INTERNATIONAL SYMPOSIUM ON ELECTROMACHINING, 2010   1   65 - 68   2010

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    Carbon fiber reinforced plastic (CFRP) is a very strong and light composite material, and it has many applications in aerospace and automotive fields. However conventional mechanical machining methods, such as cutting and grinding have some problems; delaminating, splintering, burrs of machined surface and short tool life. Electrical discharge machining (EDM) is an effective alternative for machining difficult-to-cut materials. In this paper, the EDM characteristics, such as material removal rate, electrode wear rate and surface roughness for CFRP were experimentally investigated with varying discharge peak current and pulse duration.

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  • CFD Analysis of Jet Flushing Effect on Debris Exclusion in Wire EDM Reviewed

    Akira OKADA, Takuya FUJIMOTO, Yoshiyuki UNO

    Proc. of the 21st International Conference on Computer-Aided Production Engineering, (CAPE2010) Paper No. 007, CD-Rom.   1   CDROM   2010

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  • ワイヤ放電加工用高性能ワイヤ電極の開発に関する研究(第3報)-ワイヤ表面の凹凸が放電加工特性に及ぼす影響− Reviewed

    岡田 晃, 山内俊之, 東昌幸, 清水敏明, 宇野義幸

    電気加工学会誌   43 ( 104 )   179 - 186   2009

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    DOI: 10.2526/jseme.43.179

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  • Study on Electrical Discharge Machining Characteristics of Electrically Conductive Ceramics Reviewed

    Hai Wang, Akira Okada, Takafumi Uwano, Yoshiyuki Uno, Habib Sameh

    PROGRESS OF MACHINING TECHNOLOGY   407-408 ( 407-408 )   636 - +   2009

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    This paper deals with EDM characteristics of newly develops electrically conductive ceramics. Titanium boride (TiB2) is widely used as die and mold materials because of its high hardness, high-temperature resistance and so on. The EDM characteristics of the titanium boride, such as electrode wear rate, removal rate and surface roughness were investigated. Experimental results show that EDM with low electrode wear rate is possible when copper electrode is used with positive polarity. The removal rate becomes much higher when graphite electrode is used with negative polarity.

    DOI: 10.4028/www.scientific.net/KEM.407-408.636

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  • Newly Developed CuW Electrode for High Performance EDM Reviewed

    Akira OKADA, Shingo OUE, Yoshiyuki UNO, Takayuki SHOJI, Takahiro FUKUSHIMA, Osamu TERADA

    International Journal of Electrical Machining   ( 14 )   23 - 28   2009

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  • 大面積電子ビーム照射による手術器具用ステンレス鋼の高能率表面仕上げ Reviewed

    岡田晃, 宇野義幸, 渡辺洋明, 藤原邦彦, 土居憲司

    先端加工学会誌   27 ( 1 )   48 - 55   2009

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  • Computational fluid dynamics analysis of working fluid flow and debris movement in wire EDMed kerf Reviewed

    A. Okada, Y. Uno, S. Onoda, S. Habib

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   58 ( 1 )   209 - 212   2009

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    In wire EDM, better exclusion of debris from the machined kerf is very important to obtain a stable machining performance. The purpose of this study is to investigate the fluid flow in the kerf and better jet flushing conditions of working fluid from the nozzles. The flow field and the debris motion in the kerf were analyzed by computational fluid dynamics (CFD) simulation, comparing with the observation by high-speed video camera. The influence of flow rate of working fluid from nozzles and the nozzle standoff distance on flow field in the kerf and debris particle motion were discussed. (C) 2009 CIRP.

    DOI: 10.1016/j.cirp.2009.03.003

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  • Surface Modification of Stainless Steel for Surgical Tool by EB-polishing Reviewed

    Akira Okada, Yoshiyuki Uno, Hiroaki Watanabe, Kunihiko Fujiwara, Kenji Doi

    PROGRESS OF MACHINING TECHNOLOGY   407-408 ( 407-408 )   339 - +   2009

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    A new surface finishing method by large-area electron beam irradiation (EB-polishing) for stainless steels for orthopedic surgical tool was proposed in our previous paper, and it was shown that high-efficient surface finishing was possible by the EB-polishing. In this report, the surface structure of EB-polished stainless steel is analyzed by TEM and EDX. Also, surface modification effects such as resistance to corrosion and blood repellency are evaluated. Then, the applicability of the EB-polishing as a new surface modification method of stainless steel for orthopedic surgical tool is discussed.

    DOI: 10.4028/www.scientific.net/KEM.407-408.339

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  • Improvement of Surface Characteristics of Cemeted Carbide by Large-area Electron Beam Irradiation Reviewed

    Ryoji KITADA, Akira OKADA, Yoshiyuki UNO

    Proc. of the 3rd International Conference on ASPEN, 1P2-8   1P2-8   2009

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  • Investigation on Multi-wire EDM Slicing Method for Polycrystalline Silicon Ingot Reviewed

    Hirokazu TAKAHASHI, Yasuhiro OKAMOTA, Yoshiyuki UNO, Akira OKADA, Yoshihiro ABE, Shiro TAKATA

    Proc. of the 3rd International Conference on ASPEN, 1C15   1C15   2009

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  • Fundamental Study on Releasability of Resin from EDMed Surface Reviewed

    Ryoji KITADA, Akira OKADA, Yoshiyuki UNO, Yu, YANG, Hirohiko HIOKI

    Proc. of the 9th International conference of Euspen, Vol.1, pp.117-121.   1 ( 1 )   117 - 121   2009

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  • Evaluation of Spark Location Distribution in Wire EDM by High-speed Observation Reviewed

    Masanori NAKAZAWA, Akira OKADA, Toshiyuki YAMAUCHI, Yoshiyuki UNO

    Proc. of the 5th International Conference on Leading Edge Manufacturing in 21st Century, pp.841-844.   841 - 844   2009

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  • Study on Separation Force of Molded Resin from EDMed Surface Reviewed

    Hirohiko HIOKI, Ryoji KITADA, Akira OKADA, Yoshiyuki UNO

    Proc. of the 5th International Conference on Leading Edge Manufacturing in 21st Century, pp.815-818.   815 - 818   2009

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  • Improvement of Surface Characteristics of Metal Mold by EB polishing Reviewed

    Haruhisa BAMBA, Akira OKADA, Yoshiyuki UNO, Yuji KANEKO, Itaru MATSUMOTO

    Proc. of the 5th International Conference on Leading Edge Manufacturing in 21st Century, pp.801-804.   801 - 804   2009

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  • Addition of Surface Functions to Orthopedic Surgical Tools and Jigsby Large-area Electron Beam Irradiation Reviewed

    Hiroaki WATANABE, Akira OKADA, Yoshiyuki UNO, Kunihiko FUJIWARA, Kenji DOI

    Proc. of the 5th International Conference on Leading Edge Manufacturing in 21st Century, pp.797-800.   797 - 800   2009

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  • New Surface Modification Method of Bio-Titanium Alloy by EB Polishing Reviewed

    Akira Okada, Yoshiyuki Uno, Atsuo Iio, Kunihiko Fujiwara, Kenji Doi

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   2 ( 4 )   694 - 700   2008

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    A new surface modification for bio-titanium alloy products by electron beam (EB) polishing is proposed. In this EB polishing method, high energy density EB can be irradiated without concentrating the beam. Therefore, large-area EB with a maximum diameter of 60mm can be used for instantaneously melting or evaporating metal surface. Experimental results made it clear that surface characteristics, such as repellency, corrosion resistance and coefficient of friction could be improved simultaneously with the surface smoothing in a few minutes under a proper condition. Therefore, EB polishing method has a possibility of high efficient surface smoothing and surface modification process for bio-titanium alloy.

    DOI: 10.1299/jamdsm.2.694

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  • Effect of Surface Quality of Brass Coating Wire on Wire EDM Characteristics Reviewed

    Akira Okada, Toshiyuki Yamauchi, Kimihiko Arizono, Yoshiyuki Uno

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   2 ( 4 )   735 - 741   2008

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    The purpose of this study is to develop a new type of wire electrode, in which piano wire with very high tensile strength is coated with electrically conductive layer, such as brass or zinc, in order to attain high speed and high precision wire EDM. In this report, using a trial-made thin wire of 50 mu m in diameter, the optimum thickness and quality of brass layer were experimentally investigated for higher performance fine wire EDM. Furthermore, the influence of the tensile strength of piano wire used as a core wire was discussed. As a result, the coated brass with copper content of 60-70% is effective and the thickness of coated brass is needed to be more than 1.45 mu m for high removal rate.

    DOI: 10.1299/jamdsm.2.735

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  • 段付き電極による深穴放電加工特性の向上 Reviewed

    岡田 晃, 安田竜一, 宇野義幸

    電気加工学会誌   42 ( 101 )   122 - 129   2008

  • ワイヤ放電加工用高性能ワイヤ電極の開発に関する研究(第2報) Reviewed

    岡田 晃, 山内俊之, 有園公彦, 清水敏明, 宇野義幸

    電気加工学会誌   42 ( 99 )   12 - 19   2008

  • 大面積電子ビームによる金型加工面の高能率仕上げに関する研究(第3報) Reviewed

    岡田 晃, 虞 戦波, 近藤 温, 宇野義幸, 佐野定男, 植村賢介

    精密工学会誌   74 ( 4 )   385 - 389   2008

  • Surface finishing of stainless steels for orthopedic surgical tools by large-area electron beam irradiation Reviewed

    A. Okada, Y. Uno, J. A. McGeough, K. Fujiwara, K. Doi, K. Uemura, S. Sano

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   57 ( 1 )   223 - 226   2008

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    Surgical tools and jigs are initially machined by multi-axis milling. Then surface finishing is carried out mainly by hand lapping. As these tools undergo repeated use, the removal of burrs, scratches and rust from the surfaces is also performed manually after each operation. These finishing processes are time-consuming and costly. In this study, a new finishing method by large-area electron beam irradiation is proposed. Electron beam (EB) with high energy density can be obtained without focusing the beam, and large-area EB can be used for instantly melting or evaporating the metal surface. Stainless steel for surgical tools and jigs was treated by the large-area EB irradiation method. The experimental results show that highly efficient surface smoothing of stainless steels by large-area EB irradiation may be achieved. In addition, the resistance to corrosion and blood repellency can be improved simultaneously with surface smoothing. (c) 2008 CIRP.

    DOI: 10.1016/j.cirp.2008.03.062

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  • Effect of Electrostatic Cleaning of Dielectric Working Fluid on Electrical Discharge Machining Characteristics Reviewed

    Akira OKADA, Yoshiyuki UNO, Hironori KIMURA, Seiji IWASAKI

    Proc. of 10th International conference of Euspen, pp.222-225.   222 - 225   2008

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  • Development of Multi-wire EDM Slicing Mehod for Silicon Ingot Reviewed

    Y.Okamoto, Y.Uno, A.Okada, S.Ohshita, T.Hirano, S.Takata

    Proc.of the 23th American Society for Precision Engineering Annual Meeting, pp530-533.   530 - 533   2008

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  • A new polishing method of metal mold with large-area electron beam irradiation Reviewed

    Y. Uno, A. Okada, K. Uemura, P. Raharjo, S. Sano, Z. Yu, S. Mishima

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   187 ( 187-188 )   77 - 80   2007.6

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    A new polishing method by large-area electron beam (EB) irradiation is proposed in this study. In the large-area EB irradiation equipment used here, an EB with high energy density is irradiated without focusing the beam. An EB irradiation in a few microseconds with a maximum diameter of 60 mm can be used for melting metal surface instantly. The experimental results made it clear that the surface roughness decreases from 6 mu mRz to less than 1 mu mRz in a just few minutes under a proper machining condition. The corrosion resistance of metal mold surface also could be greatly improved by large-area EB irradiation. Furthermore it is clarified that even the surface roughness of tilting surface close to 90 degrees could be well improved. Therefore, large-area EB irradiation method has a high possibility to become a high-efficiency polishing method of metal mold. (c) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmatprotec.2006.11.080

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  • 放電加工用高性能銅タングステン電極の開発 Reviewed

    岡田 晃, 大上真吾, 宇野義幸, 庄司隆行, 福島崇洋, 寺田修

    電気加工学会誌   41 ( 97 )   69 - 76   2007

  • Surface Finishing of SKD 11 Tool Steel via Plasma-based Electron Beam Irradiation Reviewed

    Yoshiaki Daichi, Sadao Sano, Yoshiyuki Uno, Akira Okada

    Journal of Key Engineering Materials   364 ( 364-366 )   302 - 307   2007

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  • Advantage of Flange Type Electrode in Deep-Hole EDM Reviewed

    Ryuichi YASUDA, Akira OKADA, Yoshiyuki UNO

    Proc. of the 4th International Conference on Leading Edge Manufacturing in 21st Century, pp.529-532   529 - 532   2007

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  • RF Cutting of Non and Semiconducting Materials Reviewed

    D.M.Macmillan, B.W. Flynn, J. McGeough, A. Okada

    CIRP Annuals 2007 - Manufacturing Technology, 56/2   2007

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  • Unconventional Method of Cutting for Orthopaedic Surgery Reviewed

    Joseph McGeough, Akira OKADA

    Keynote adress The 20th International Conference on Computer-Aided Production Engineering, 167-171.   167 - 171   2007

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  • Radio Frequency Electrodischarge Machining of Silicon Wafers Reviewed

    David McMillan, Joseph McGeough, Brian Flynn, Akira Okada

    The 20th International Conference on Computer-Aided Production Engineering, 167-171.   167 - 171   2007

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  • High efficiency EB polishing of metal mold Reviewed

    Akira Okada, Yoshiyuki Uno, Yoshiaki Daichi, Sadao Sano

    PROCEEDINGS OF THE 15TH INTERNATIONAL SYMPOSIUM ON ELECTROMACHINING   409 - 414   2007

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    A new polishing method by large-area electron beam (EB polishing) is proposed. In the EB polishing, an EB with high energy density is irradiated without focusing the beam. An EB with a maximum diameter of 60 mm can be used for melting metal surface instantly. The experimental results made it clear that the surface roughness decreased from 6 mu m Rz to less than 1 mu m in just a few minutes under a proper condition. In addition, even the tilting surface could be polished very well. Furthermore, the corrosion resistance of metal surface also could be greatly improved.

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  • Multi-wire Slicing Method for Silicon Ingot with Electrical Discharge Machining Reviewed

    Satoru OHSHITA, Yoshiyuki UNO, Akira OKADA, Yasuhiro OKAMOTO, Tameyoshi HIRANO, Shiro TAKATA

    Proc. of Asian Electrical Machining Symposium '07, E21, pp.126-129   126 - 129   2007

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  • Effect of Surface Quality of Brass Coating Wire on Wire EDM Characteristics Reviewed

    Kimihiko ARIZONO, Toshiyuki YAMAUCHI, Akira OKADA, Yoshiyuki UNO

    Proceedings of the 4th International Conference on Leading Edge Manufacturing in 21st Century, pp.533-536   533 - 536   2007

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  • Surface modification for orthopaedic titanium alloy by wide-area electron beam Reviewed

    A. Okada, Y. Uno, K. Uemura, P. Raharjo, J. A. McGeough

    Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture   221 ( 2 )   173 - 178   2007

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    Wide-area electron beam (WAEB) irradiation was proposed as a new surface-finishing process for orthopaedic titanium alloy products. The surface roughness could be reduced from Rz = 10 μm to Rz = 0.7 μm all over the wide circular surface within a diameter of 60 mm in just a few minutes under optimum electron beam conditions. In this paper, the surface structure and the surface characteristics of WAEB-irradiated surface are discussed. The crystal grain size becomes small and the microstructure in the surface vicinity changes under WAEB irradiation. The corrosion resistance and the repellency can be improved simultaneously with the surface smoothing. Therefore, the WAEB irradiation method enables highly efficient surface smoothing and surface modification of orthopaedic titanium alloy. © IMechE 2007.

    DOI: 10.1243/09544054JEM574

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  • New Surface Modification Method of Bio-titanium Alloy by EB Polishing Reviewed

    Atsuo IIO, Akira OKADA, Yoshiyuki UNO, Kunihiko FUJIWARA, Kenji DOI

    Proceedings of the 4th International Conference on Leading Edge Manufacturing in 21st Century, pp.557-560   557 - 560   2007

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  • 放電加工面の耐食性に関する基礎的研究 Reviewed

    岡田 晃, 田中 智, 三田耕司, 宇野義幸

    電気加工学会誌   40 ( 94 )   66 - 73   2006

  • Machining characteristics of EDM by radio-frequency plasma Reviewed

    A. Okada, J. A. McGeough, D. MacMillan, B. Flynn

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   55 ( 1 )   167 - 170   2006

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    An extension to the electrical discharge machining method by introduction of radio-frequency plasma is proposed. Sparking with the radio-frequency plasma can be generated in paraffin oil by simple electrical circuitry. In this paper, experimental investigations are described on the fundamental effects of the resonant frequency, type of electrode and workpiece materials on machining characteristics for high performance radio-frequency machining in paraffin oil. The results show that the removal rate and the electrode wear vary with the resonant frequency and type of electrode materials. The surface roughness can be reduced to less than 1 mu m Rz under suitable experimental conditions.

    DOI: 10.1016/S0007-8506(07)60390-4

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  • Internal-Surface Finishing of Small Hole by Electrochemical Processing Using Soluble Fluid for Honing (2^<nd> Report) : Removal of Passive Film Using Honing Stick and High-Efficiency Surface Finishing Reviewed

    OKADA Akira, HASHIMOTO Atsushi, UNO Yoshiyuki, YAMAMOTO Shoichi, TANAKA Masashi, TSUKUDA Akira

    Journal of the Japan Society of Electrical-machining Engineers.   40 ( 95 )   169 - 176   2006

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  • A Newly Developed Polishing Method by Large-area Electron Beam Irradiation Reviewed

    Yoshiyuki UNO, Akira OKADA, Kensuke UEMURA, Purwadi RAHARJO

    Proceedings of 6th Euspen International Conference, Vol2,132-135.   ( 2 )   132 - 135   2006

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  • Newly developed CuW electrode for high performance EDM Reviewed

    Shingo Oue, Akira Okada, Yoshiyuki Uno, Takayuki Shoji, Takahiro Fukushima, Osamu Terada

    Progress of Machining Technology, Proceedings   273 - 276   2006

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    This paper introduces a newly developed CuW electrode for high performance electrical discharge machining (EDM). Conventional CuW electrode used widely for high precision EDM is generally made by melting method, and the mixture ratio of Cu and W is restricted within narrow limits. On the other hand, it can be changed extensively in the case of a new CuW electrode made by powder sintering method. In order to obtain the higher metal removal rate with smaller electrode wear rate, the optimum mixture ratio of Cu and W was investigated. Experimental results show that the EDM characteristics such as, metal removal rate, electrode wear rate and the surface finish for metal mold steel greatly depend on the mixture ratio of CuW electrode. The electrode wear rate could be reduced by using the new CuW electrode with proper mixture ratios, compared with the conventional one, since workpiece material adhered to the electrode end surface during machining and prevented the electrode from wearing with high temperature. Also, better machining stability and better surface finish could be attained under proper mixture ratios of Cu and W Therefore, the new CuW electrode made by powder sintering method has high possibility for higher performance EDM.

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  • High-efficiency finishing process for metal mold by large-area electron beam irradiation Reviewed

    Y Uno, A Okada, K Uemura, P Raharjo, T Furukawa, K Karato

    PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY   29 ( 4 )   449 - 455   2005.10

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    A new finishing process for metal molds by large-area electron beam (EB) irradiation is proposed in this study. In the large-area EB irradiation equipment used here, an EB with high-energy density is irradiated without focusing the beam, and so the EB with a maximum diameter of 60mm can be used for melting or evaporating metal surface instantly. Experimental results show that the surface roughness decreases from 6 mu mRz to less than 1 mu mRz in just a few minutes under proper machining conditions. The corrosion resistance of metal mold surface also could be greatly improved by large-area EB irradiation. Furthermore, the surface roughness of tilting surface close to 90 degrees could be well improved. Therefore, large-area EB irradiation method has a possibility to become a high-efficiency finishing process for metal molds. (c) 2005 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.precisioneng.2004.12.005

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  • 大面積電子ビームによる金型加工面の高能率仕上げに関する研究(第2報) Reviewed

    岡田 晃, 宇野義幸, 仁科圭太, 植村賢介, Purwadi RAHARJO, 佐野定男, 虞 戦波, 株)ソディック

    精密工学会誌   71 ( 11 )   1399 - 1403   2005

  • ワイヤ放電加工用高性能ワイヤ電極の開発に関する研究(第1報) Reviewed

    山内俊之, 岡田 晃, 森田真人, 清水敏明, 宇野義幸, トクセン工

    電気加工学会誌   39 ( 92 )   28 - 35   2005

  • Fundamental Study on Radiofrequency Machining of Metals Reviewed

    Akira OKADA, Joseph, A. McGEOUGH, David MacMILLAN, dinburgh University

    Proceedings of the 19th International Conference on Computer Aided Production Engineering, (CD-ROM)   2005

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  • Fundamental Study on Multi-wire EDM Slicing Method for Monocrystalline Silicon Ingot-Effects of Supply Method of Working Fluid and Wire Speed on Machining Characteristics- Reviewed

    Yoshiyuki UNO, Akira OKADA, Yasuhiro OKAMOTO, Katsutomo Suzuki, Satoshi HIROTA, Tameyoshi HIRANO, Shiro TAKATA, Kzuhiko ISHIKAWA

    Proceedings of the 3rd International Conference on Leading Edge Manufacturing in 21st Century, pp.783-786   783 - 786   2005

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  • Fundamental Study on Coating Wire Electrode for High Performance WEDM Reviewed

    Masato. MORITA, Toshiyuki. YAMAUCHI, Akira. OKADA, Yoshiyuki. UNO, Toshiaki. SHIMIZU

    Proceedings of the 3rd International Conference on Leading Edge Manufacturing in 21st Century, pp.779-782   779 - 782   2005

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  • A New Surface Modification Method of Metal Moldby Large-area Electron Beam Irradiation Reviewed

    Akira OKADA, Yoshiyuki UNO, Keita NISHINA, Kensuke UEMURA, Purwadi?RAHARJO, Sadao SANO, Yu ZHANBO

    Proceedings of the 3rd International Conference on Leading Edge Manufacturing in 21st Century, pp.739-744   739 - 744   2005

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  • 寒天培地を利用した金属のバイオマシニング Reviewed

    *岡田 晃,宇野義幸,中西 隆,金枝敏明

    先端加工学会誌   23 ( 1 )   13 - 18   2005

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  • Biomachining of Metal Using Agar Culture Medium Reviewed

    Journal of the Japan Society of Advanced Production Technology   23 ( 1 )   13 - 18   2005

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  • Unconventional cutting technologies in orthopaedic surgery Reviewed

    JA McGeough, A Okada

    AMST '05: Advanced Manufacturing Systems and Technology, Proceedings   ( 486 )   87 - 97   2005

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    In this paper, unconventional methods of cutting based on ultrasonics, laser, and water jet mechanisms that might be used in orthopaedic surgery are discussed. Their advantages include no or little contact with bone,or tissue that is to be cut, the application of much less mechanical force compared to traditional techniques, and reduction in localised heat effect in the region undergoing surgical cutting. A critical analysis is performed to identify their limitations and merits.

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  • Effect of debris distribution on wall concavity in deep-hole EDM Reviewed

    S Cetin, A Okada, Y Uno

    JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING   47 ( 2 )   553 - 559   2004.6

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    In deep-hole electrical discharge machining, the electrode jump height and hence the movement of the machining debris inside the side gap affect the wall concavity of the machined holes. In this study, the dielectric fluid flow and the debris distribution in the machining gap caused by electrode jump is analyzed to understand the wall concavity phenomenon of the holes using a computational fluid dynamics (CFD) simulation program. Fluid flow and debris-fluid interaction under low and high electrode jumps are examined and compared. The accuracy of the predictions obtained by the numerical calculation is assessed through comparisons with experimental data.

    DOI: 10.1299/jsmec.47.553

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  • High efficient surface finishing of bio-titanium alloy by large-area electron beam irradiation Reviewed

    A Okada, Y Uno, N Yabushita, K Uemura, P Raharjo

    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   149 ( 1-3 )   506 - 511   2004.6

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    A new surface finishing process for bio-titanium alloy products by large-area electron beam (LAEB) irradiation is proposed. In the LAEB irradiation equipment, high energy density EB can be irradiated without concentrating the beam. Therefore, LAEB with a maximum diameter of 60 mm can be used for instantaneous melting or evaporating metal surface. Experimental results made it clear that the surface roughness becomes smaller with increasing energy density of beam. Under a proper irradiating condition, the surface roughness of titanium alloy machined with end mill decreases from 10 to 0.8 mum R-z in a few minutes. Moreover, the corrosion resistance can be greatly improved. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmatprotec.2004.02.017

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  • 大面積パルス電子ビーム照射によるチタン合金製生体部品の高能率表面仕上げ Reviewed

    岡田 晃, 宇野 義幸, 佐藤 公亮, 八野田 健, 植村 賢介

    電気加工学会誌   38 ( 89 )   27 - 34   2004

  • Effect of Debris Accumulation on Machining Speed in EDM Reviewed

    Serkan CETIN,*Akira OKADA, Yoshiyuki UNO

    International Journal of Electrical Machining   ( 9 )   9 - 14   2004

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  • Electrode jump motion in linear motor equipped die-sinking EDM Reviewed

    S Cetin, A Okada, Y Uno

    JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME   125 ( 4 )   809 - 815   2003.11

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    The effects of electrode jump parameters on machining speed and depth were experimentally investigated in linear motor equipped electrical discharge machining. A new definition named "Machining speed breakpoint" is introduced, theoretically calculated from a proposed electrode jump and debris exclusion model, and compared with the experimental results. Additionally, an algorithm is developed to calculate the accumulation of debris in machining gap. The algorithm showed that the debris concentration in gap rises suddenly before the machining speed break point.

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  • 「文鎮」から「ジャイロスコープ」へ進化した「機械工作実習」 Reviewed

    宇野 義幸, 岡田 晃, 岡本 康寛

    工学教育   51 ( 5 )   58 - 61   2003

  • Study on Surface Finishing of Metal Mold by Large-area Electron Beam Irradiation Reviewed

    Akira OKADA, Yoshiyuki UNO, Noriyasu YABUSHITA, Kensuke UEMURA, Purwadi RAHARJO

    Proc. of the International Conference on Leading Edge Manufacturing in 21st Century, pp1023-1028   1023 - 1028   2003

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  • Investigation of Dielectric Flow during Electrode Jump in EDM Gap Reviewed

    Serkan. CETIN, Akira OKADA, Yoshiyuki UNO, Yoshifumi KAWAZOE

    Proc. of the International Conference on Leading Edge Manufacturing in 21st Century, pp939-942   939 - 942   2003

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  • Surface Modification of EDMed Surface by Wide-area Electron Beam Irradiation Reviewed

    Proceedings of the 18th American Society for Precision Engineering Annual Meeting   CD-ROM   172 - 175   2003

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  • 放電加工面の摩擦特性に関する基礎的研究 Reviewed

    岡田晃, 宇野義幸, 中島洋平

    電気加工学会誌   37 ( 85 )   24 - 31   2003

  • 大面積電子ビームによる金型加工面の高能率仕上げに関する研究 Reviewed

    *岡田 晃,宇野義幸,藪下法康,植村賢介,Purwadi Raharjo

    精密工学会誌   69 ( 10 )   1464 - 1468   2003

  • バイオマシニングにおける加工メカニズムの解明および加工速度向上に関する試み Reviewed

    岡田 晃, 宇野 義幸, 久野 智之, 金枝 敏明

    精密工学誌   68 ( 12 )   1585 - 1589   2002

  • EDM characteristics of metal impregnated graphite electrode Reviewed

    A Okada, Y Uno, T Takagi, M Yokotani

    PROGRESS OF MACHINING TECHNOLOGY   402 - 407   2002

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    In EDM process, graphite is widely used as an electrode. However, in EDM with graphite electrode under finish condition, the electrode wear is larger, and it is difficult to form thin and fine shapes by mechanical machining, because of its high brittleness. Therefore, graphite electrode cannot be applied to EDM with fine complicated shapes. In order to achieve high precision EDM with graphite electrode, graphite electrodes impregnated with metal were newly developed in this study. That is, copper or aluminum was impregnated into pore parts of graphite-grains-sintered electrode for improving its strength and heat conductivity. Next, the EDM characteristics were investigated. Experimental results indicated that the machined surface roughness in the case for metal impregnated graphite electrode became much smaller, compared with normal graphite electrode, while there was no difference in the electrode wear and removal rate among them. Additionally, the reasons for smaller machined surface roughness were analyzed, and it was made clear that small surface roughness obtained by using metal impregnated electrodes was caused by small roughness of electrode end surface and the effect of metal powder mixed machining fluid.

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  • ホーニング用水溶性切削油を用いた電解加工による小径円筒内面仕上げ Reviewed

    宇野義幸,*岡田晃,中聡,山本庄一,坂根 豊

    電気加工学会誌   36 ( 81 )   2002

  • Surface Modification of EDMed Surface with Powder Mixed Fluid Reviewed

    Proc. of the 2nd International Conference and Exhibition on Design and Production of Dies and Molds   2001

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  • A New Micro EDM Technique of Monocrystalline Silicon Using Fine Triangular Section Electrode Reviewed

    Akira OKADA, Yoshiyuki UNO, Yasuhiro OKAMOTO, Hiroshi NAKASHIMA, Hidetou TANAKA, Saburo OKADA

    Proc.of the13th International Symposium for ElectroMachining, pp.381-389.   381 - 389   2001

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  • Energy Distribution in Electrical Discharge Machining with Graphite Electrode(共著) Reviewed

    Okada Akira, Uno Yoshiyuki, Okajima Isao

    Memoirs of the Faculty of Engineering,Okayama University   34 ( 1・219-26 )   19 - 26   2000

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  • 単結晶シリコンインゴットの放電スライシング法(共著) Reviewed

    岡田 晃, 宇野 義幸, 岡本 康寛, 伊藤 久, 平野 爲義

    電気加工学会誌   34 ( 75 )   14 - 21   2000

  • Wire EDM slicing of monocrystalline silicon ingot Reviewed

    Y Uno, A Okada, Y Okamoto, T Hirano

    PROCEEDINGS OF THE FIFTEENTH ANNUAL MEETING OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING   172 - 175   2000

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  • High Performance Slicing Method of Monocrystalline Silicon Ingot by Wire EDM(共著) Reviewed

    Initiatines of Precision Engineering at the Beginning of a Millennium   219 - 223   2000

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  • Formation of hard layer by EDM with carbon powder mixed fluid using titanium electrode Reviewed

    A Okada, Y Uno, K Hirao, T Takagi

    PROGRESS OF MACHINING TECHNOLOGY   464 - 469   2000

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    A new method for forming hard layer containing titanium carbide by EDM with carbon powder mixed fluid using titanium electrode is proposed, and the effects of machining conditions on characteristics of the layer are experimentally investigated. Furthermore, the wear resistance of EDMed surface was evaluated. Experimental analysis made it clear that a thick and smooth TiC layer could be formed on the machined surface by this method. It was also pointed out that the hardness of modified surface became higher with an increase of discharge duration and/or carbon powder concentration in the kerosene type machining fluid, and that the wear resistance of the modified layer was much higher than that of base material.

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  • High efficiency fine boring of monocrystalline silicon ingot by electrical discharge machining Reviewed

    Y Uno, A Okada, Y Okamoto, K Yamazaki, SH Risbud, Y Yamada

    PRECISION ENGINEERING-JOURNAL OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING   23 ( 2 )   126 - 133   1999.4

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    This article deals with high efficiency and high accuracy fine boring in a monocrystalline silicon ingot by electrical discharge machining (EDM). In manufacturing process of integrated circuits, a plasma-etching process is used for removing oxidation films. This process has recently been examined for use of monocrystalline silicon as the electrode to minimize the contamination. However, it is difficult to machine silicon accurately by the conventional diamond drilling method, because the material removal is due to brittle fracture. The machining force in the EDM process is very small compared with that in conventional machining, therefore, the possibility of high efficiency and high accuracy boring holes in silicon ingot by EDM is experimentally investigated. The removal rate of monocrystalline silicon by EDM is much higher than that of steel, while the electrode wear is extremely small. The improvement method leads to a better hole without chipping at the exit of hole or sticking of the insulator on the wall of hole. Furthermore, it is proved that even a high aspect ratio of about 200 boring is possible. (C) 1999 Elsevier Science Inc. All rights reserved.

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  • Internal surface finishing of small hole by electrochemical machining after honing Reviewed

    A Okada, Y Uno, T Furukawa, S Naka, S Yamamoto, A Kinoshita

    ABRASIVE TECHNOLOGY: CURRENT DEVELOPMENT AND APPLICATIONS I   275 - 282   1999

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    A new internal surface finishing method of small holes by ECM using a honing machine was proposed, and the machining properties were experimentally investigated. Experimental analysis made it clear that a suitable electrolytic current density condition existed for improving the surface roughness, and the generation of passive film on the machined surface could be prevented by mixing inverse electrolytic current into the normal one. Then, it was pointed out that the surface roughness could be reduced to approximately a half because only protruding parts were selectively. removed under a proper condition. This method has the possibility to be a high efficiency internal surface finishing operation of small holes after honing.

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  • Surface Modification by EDM with Nickel Powder Mixed Fluid(共著) Reviewed

    International Journal of Electrical Machining   ( 4 )   47 - 52   1999

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  • 三角形断面電極による微細複雑形状放電加工法(共著) Reviewed

    岡田 晃, 岡本 康寛, 宇野 義幸, 渡部 晃次, 田中 英登, 岡田 三郎

    精密工学会誌   65 ( 1 )   155 - 159   1999

  • チタン電極を用いた炭素粉末混入放電加工による表面改質(共著) Reviewed

    岡田 晃, 宇野 義幸, 平尾 和久, 高木 俊

    電気加工学会誌   33 ( 73 )   31 - 37   1999

  • グラファイト電極を用いた高効率放電加工法に関する研究(共著) Reviewed

    郭 常寧,宇野義幸,岡田 晃*,勝田智宣,橋川栄二,高木 俊

    電気加工学会誌   33 ( 72 )   37 - 45   1999

  • EDM Characteristics of CVD-Carbon Electrode(共著) Reviewed

    International Journal of Electrical Machining   ( 3 )   19 - 24   1998

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  • ニッケル粉未混入放電加工におけるアルミニウム青銅の表面特性(共著) Reviewed

    宇野 義幸, 岡田 晃, 山田 知彦, 林 泰弘, 田渕 義晨

    電気加工学会誌   32 ( 70 )   24 - 31   1998

  • A new slicing method of monocrystalline silicon ingot by wire EDM Reviewed

    A Okada, Y Uno, Y Okamoto

    12TH INTERNATIONAL SYMPOSIUM FOR ELECTROMACHINING (ISEM)   1405   417 - 424   1998

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    This paper deals with a new slicing method of monocrystalline silicon ingot by wire EDM. In manufacturing process of silicon wafer, ID blade and multi wire saw have conventionally been used for slicing of ingot. However, it is difficult to apply these methods for larger ingot such as 12(R) or 16 " expected to be used in the near future, since there are some problems in efficiency, accuracy, slurry treatment, contamination and so on. Therefore, a new slicing method is required as soon as possible. In this study, the possibility of slicing by WEDM was proposed and the machining properties as well as surface integrity were experimentally investigated. It was made clear that WEDM had the possibility as a new slicing method and that contamination due to adhesion and diffusion of wire electrode material to machined surface could be reduced by using the reversed polarity WEDM.

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  • A new micro EDM technique for fine complicated hole with triangular section electrode Reviewed

    Y Uno, A Okada, Y Okamoto, K Watanabe, S Okada, Y Yamada

    PROCEEDINGS OF THE THIRTEENTH ANNUAL MEETING OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING   65 ( 1 )   239 - 242   1998

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    DOI: 10.2493/jjspe.65.155

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  • Study on Electrical Discharge Machining Characteristics of Coated Electrodes(共著) Reviewed

    Memoirs of the Faculty of Enggineering. , Okayama University   32 ( 1・2 )   1 - 6   1998

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  • High efficiency fine boring of single crystalline silicon ingot by electrical discharge machining Reviewed

    Y Uno, A Okada, Y Okamoto, Y Yamada

    PROCEEDINGS OF THE TWELFTH ANNUAL MEETING OF THE AMERICAN SOCIETY FOR PRECISION ENGINEERING   525 - 528   1997

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  • 単結晶シリコンインゴットの高能率貫通穴放電加工に関する研究(共著) Reviewed

    宇野 義幸, 岡田 晃, 岡本 康寛

    精密工学会誌   63 ( 12 )   1725 - 1729   1997

  • 単結晶シリコンの放電加工に関する基礎的研究(共著) Reviewed

    宇野義幸, 岡田晃, 中西洋人, 岡本康寛

    精密工学会誌   63 ( 10 )   1459 - 1463   1997

  • Electrical Discharge Machining of a Groove with a Rotating Disk Electrode

    UNO Yoshiyuki, OKADA Akira, ITOH Mitsuru, YAMAGUCHI Tsuyoshi

    International Journal of Electrical Machining   1   13 - 20   1996.1

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  • CVD炭素電極の放電加工特性(共著) Reviewed

    宇野 義幸, 岡田 晃, 中西 洋人, 郭 常寧, 岡本 康寛, 高木 俊

    電気加工学会誌   30 ( 65 )   1 - 8   1996

  • プラスチック金型用アルミニウム合金の放電加工特性(共著) Reviewed

    宇野 義幸, 岡田 晃, 森田 剛, 高木 俊

    電気加工学会誌   30 ( 63 )   11 - 21   1996

  • Newly Developed CVD-Carbon Electrode for Higher Performance EDM Reviewed

    Yoshiyuki UNO, Akira OKADA, Changning GUO, Takashi TAKAGI

    Progress of Cutting and Grinding, Vol.3 (Proc.of the 3rd International Conference on Progress of Cutting and Grinding), pp.386-391   ( 3 )   386 - 391   1996

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  • 単結晶シリコンの微細穴放電加工に関する研究(共著) Reviewed

    宇野 義幸, 窪田 真一郎, 横溝 精一, 岡田 晃, 田中 英登

    電気加工学会誌   30 ( 65 )   9 - 16   1996

  • The effect of high speed polarity changing on EDM performance Reviewed

    Y Uno, A Okada, M Itoh

    INTERNATIONAL SYMPOSIUM FOR ELECTROMACHINING, PROCEEDINGS   29 ( 60 )   241 - 249   1995

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:PRESSES POLYTECHNIQUES ET UNIVERSITAIRES ROMANDES  

    DOI: 10.2526/jseme.29.22

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  • Surface Generation Mechanism in Electrical Discharge Machining with Silicon Powder Mixed Fluid Reviewed

    Akira OKADA, Yoshiyuki UNO

    Proc.of International Conference on Precision Engineering'95, pp.537-540.   537 - 540   1995

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  • 高速極性切替放電加工に関する研究(共著) Reviewed

    宇野 義幸, 岡田 晃, 伊藤 満, 高木 俊

    電気加工学会誌   29 ( 60 )   22 - 30   1995

  • 粉未混入放電加工における表面生成機構の研究(共著) Reviewed

    宇野 義幸, 岡田 晃, 亀川 出

    電気加工学会誌   29 ( 62 )   9 - 17   1995

  • A New Biological Machining Technique with Chemolithotrophic Bacteria Reviewed

    Yoshiyuki UNO, Toshiaki KANEEDA, Seiichi YOKOMIZO, Akira OKADA, Takahiko YOSHIMURA

    Proc.of the 9th American Society for Precision Engineering Annual Meeting, pp.457-460.   457 - 460   1994

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  • 回転円板電極による放電溝加工の研究(共著) Reviewed

    宇野 義幸, 岡田 晃, 伊藤 満, 山口 毅

    電気加工学会誌   28 ( 58 )   24 - 37   1994

  • 銅合金(MS46)の放電加工特性(共著) Reviewed

    宇野 義幸, 岡田 晃, 高木 俊, 田渕 義晨

    電気加工学会誌   28 ( 57 )   1 - 10   1994

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  • High Efficient Electrical Discharge Machining of Titanium Alloy. Reviewed

    UNO Yoshiyuki, OKADA Akira, NAKAJIMA Toshikatsu, TAKAGI Takashi

    Journal of the Japan Society of Electrical Machining Engineers   27 ( 56 )   313 - 316   1993

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    Language:Japanese   Publisher:Japan Society of Electrical Machining Engineers  

    The factors which make titanium alloy difficult to EDM are experimentally investigated, analyzing the shape of crater generated by a single discharge, the pile-up time of workpiece, the waveform of successive discharge current, the shape of debris and so on. Then the condition for high efficient electrical discharge machining of titanium alloy is recommended. Main conclusions obtained in this study are as follows:<br>(1) The pile-up generated by a single discharge in titanium alloy is higher than that in steel, and the pile-up time is also longer.<br>(2) The removal volume of crater generated by a single discharge in titanium alloy is larger than that in steel, which agrees with the conventional theory that the lower product of melting point and the thermal conductivity of material leads to easier EDMing.<br>(3) The metal removal rate is lower and the electrode wear is larger for titanium alloy under the conventional EDM condition as compared with those for steel, since the frequent short-circuit results in the unstability of machining.<br>(4) High efficient and low electrode wear electrical discharge machining of titanium alloy is possible by decreasing the duty factor, since the resting duration is enough for pileup of workpiece and the machining becomes stable.

    DOI: 10.2526/jseme.27.56_1

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  • チタン合金の高能率放電加工に関する研究(共著) Reviewed

    宇野義幸, 岡田晃, 中島利勝, 高木俊

    電気加工学会誌   27 ( 56 )   1 - 11   1993

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Books

  • CIRP encyclopedia of production engineering 2nd ed. Reviewed International journal

    CIRP - The International Academy for Production Engineering, Chatti, Sami( Role: Joint author ,  Electron Beam Machining)

    Springer  2019  ( ISBN:9783662531198

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    Total pages:2 v.   Language:English Book type:Dictionary, encyclopedia

    DOI: 10.1007/978-3-662-53120-4

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  • Trend of Electrical Discharge Machining Technology 2017 Reviewed

    ( Role: Contributor)

    2016 

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    Language:Japanese Book type:Textbook, survey, introduction

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  • Handbook of Metal Biotechnology Applications for Environmental Conservation and Sustainability Reviewed International journal

    Akira Okada, Yoshiyuki Uno( Role: Contributor ,  Biomachining-Micromachining of Metals by Bacteria)

    Pan Stanford Publishing  2012 

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  • 最先端ウェーハ&製造技術大全

    岡本康寛, 岡田晃( Role: Contributor)

    電子ジャーナル  2013 

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  • メタルバイオテクノロジーによる環境保全と資源回収

    宇野義幸, 岡田晃( Role: Contributor ,  微生物による金属の微細加工)

    シーエムシー出版  2011 

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  • アクチュエータが未来を創る

    岡田晃( Role: Contributor ,  2.2.2特殊加工)

    産業図書  2011 

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  • 太陽エネルギー有効利用最前線

    宇野義幸, 岡本康寛, 岡田晃( Role: Contributor ,  ワイヤ放電加工技術を利用したシリコンインゴットのスライシング)

    エヌ・ティー・エス  2008 

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  • 初心者でもよくわかる金型加工の基礎

    宇野義幸, 岡田晃( Role: Contributor ,  電子ビーム加工)

    日刊工業新聞社  2007 

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  • 砥粒加工技術のすべて

    宇野義幸, 岡田晃( Role: Contributor ,  電子ビームポリッシング)

    工業調査会  2006 

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  • 金型製作の基本とノーハウ

    宇野義幸, 岡田晃( Role: Contributor)

    大河出版  2005 

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MISC

  • ワイヤ放電加工における加工液流れと加工粉排出の数値流体解析 Invited Reviewed

    岡田晃

    電気加工学会誌   56 ( 141 )   18 - 25   2022.3

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  • つり下げ電極を用いた曲がり穴放電加工における形状精度の改善 Invited Reviewed

    岡田 晃, 因幡勇汰, 山口篤

    型技術   36 ( 10 )   80 - 83   2021.9

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  • 放電加工によるチタン合金表面への骨伝導性付与 Invited Reviewed

    岡田晃, 篠永東吾

    砥粒加工学会誌   63 ( 11 )   551 - 554   2019.11

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    J-GLOBAL

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  • Development of Surface Finishing Method by Large-area Pulsed EB Irradiation Invited Reviewed

    51 ( 126 )   141 - 146   2017.3

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  • Multi-slicing of Semiconductors by Wire Electrical Discharge Machining Technology Invited Reviewed

    OKAMOTO Yasuhiro, OKADA Akira

    Journal of the Japan Society for Precision Engineering   83 ( 9 )   825 - 828   2017

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    DOI: 10.2493/jjspe.83.825

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  • Surface Smoothing for Metal Parts Fabricated by Additive Manufacturing Using Large-area EB Irradiation Method Invited Reviewed

    Atsushi YAMAGUCHI, Togo SHINONAGA, Akira OKADA

    JOURNAL OF THE JAPAN WELDING SOCIETY   92 ( 6 )   409 - 413   2023

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    Authorship:Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:Japan Welding Society  

    DOI: 10.2207/jjws.92.409

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  • パルスレーザによる単結晶ダイヤモンドの高品位加工 Invited Reviewed

    岡本康寛, 大久保翼, 岡田 晃

    電気加工技術   46 ( 143 )   22 - 27   2022.7

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  • 連続波レーザの斜角入射による金属の高速微細溝加工 Invited Reviewed

    坂井辰彦, 田浦のぞみ, 岡本康寛, 岡田晃

    光アライアンス   33 ( 7 )   15 - 18   2022.7

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  • 数値解析を活用した大面積電子ビーム加工現象の解明 Invited Reviewed

    岡田晃, 篠永東吾

    電気加工学会誌   56 ( 141 )   33 - 40   2022.3

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  • 箔支持ガイドを用いた曲がり穴放電加工の形状精度改善 Invited Reviewed

    山口 篤, 岡田 晃

    電気加工技術   45 ( 139 )   28 - 33   2021.5

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  • ワイヤ放電加工における放電位置とワイヤ挙動の高速度観察 Invited Reviewed

    岡田 晃

    電気加工学会誌   53 ( 133 )   94 - 99   2019.7

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  • CFDを用いたワイヤ放電加工におけるノズル噴射加工液流れの解明 Invited Reviewed

    岡田晃, 栗原治弥

    電気加工学会誌   53 ( 133 )   100 - 107   2019.7

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  • 大面積電子ビーム照射法による金属AM造形物の表面欠陥修復および表面平滑化 Invited Reviewed

    山口篤, 篠永東吾, 岡田晃

    電気加工技術   43 ( 133 )   7 - 12   2019.5

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  • EBポリッシングによる複雑形状金型の表面仕上げ Invited Reviewed

    篠永東吾, 岡田晃

    電気加工技術   43 ( 133 )   1 - 6   2019.5

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  • 電子ビーム照射による金型鋼の表面改質 Invited Reviewed

    萩原義人, 佐野正明, 岡田 晃

    電気加工技術   43 ( 133 )   13 - 18   2019.5

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  • 吊り下げ電極を用いた放電加工による曲がり穴の創成

    岡田晃, 山口篤

    電気加工学会誌   52 ( 131 )   166 - 171   2018.11

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  • 非固定電極を用いた放電加工による金型の三次元流路形成技術

    岡田晃, 山口篤

    プラスチックエイジ   64 ( 11 )   41 - 45   2018.11

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  • 非固定電極を用いた曲がり穴放電加工法の高性能化

    岡田晃

    先端加工技術   2018.8

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  • ノズルフラッシングの最適化によるワイヤ放電加工特性の改善

    岡田晃

    型技術   33 ( 7 )   18 - 21   2018.6

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  • ワイヤ放電加工用銅合金の開発

    松村尚国, 野村和弘, 岡田晃, 桑田彩花

    電気加工技術   42 ( 130 )   13 - 18   2018.5

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  • ピコ秒パルスレーザを用いた透明体材料の内部加工

    岡本康寛, 岡田 晃

    電気加工学会誌   51 ( 126 )   152 - 157   2017.3

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  • EBポリッシングによる超高能率金型表面仕上げ技術の確立

    岡田晃

    フォームテックレヴュー   26   17 - 22   2017.3

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  • 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM18)開催報告

    國枝正典, 岡田晃

    電気加工学会誌 51,126 161-170   51 ( 126 )   161 - 171   2017.3

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    Publishing type:Meeting report  

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  • 電子ビームを活用した金型高品質表面改質技術

    岡田 晃

    型技術   30 ( 11 )   30 - 33   2015.11

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  • Curved Hole Electrical Discharge Machining Using Suspended Ball Electrode

    Atsushi YAMAGUCHI, Akira OKADA

    Journal of the Japan Society for Precision Engineering   81 ( 11 )   987 - 990   2015.11

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    DOI: 10.2493/jjspe.81.987

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  • キーホール発生境界近傍におけるアルミニウム合金の高品位微細レーザ溶接

    岡本康寛, 中芝伸一, 酒川友一, 岡田 晃

    レーザ加工学会誌   22 ( 3 )   180 - 185   2015.9

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  • Formation of Internal Modification with High Aspect Ratio in Sapphire by Sub-nanosecond Pulsed Fiber Laser

    22 ( 2 )   104 - 109   2015.6

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  • つり下げ電極を用いた放電加工による小径曲がり穴の創成

    岡田晃

    日刊工業新聞社日刊工業新聞「工作機械産業」   2015.3

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  • Study on Curved Hole Drilling by EDM Using Suspended Electrode

    38 ( 118 )   1 - 6   2014.5

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  • 大面積電子ビーム照射による金型表面特性向上技術

    岡田晃

    機械と工具   4 ( 4 )   17 - 23   2014.4

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  • Micro-drilling of high hardness material by ns pulsed laser

    58 ( 2 )   83 - 86   2014.2

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  • レーザー加工による多層化人工皮膚への皮膚蒸泄水分排出孔の形成に関する研究

    前田 直人, 潘 秋月, 岡本 康寛, 岡田 晃, 神 桂二, 坂本 隼一, 兒玉 直紀, 西川 悟郎, 皆木 省吾

    顎顔面補綴   36 ( 2 )   110 - 111   2013.12

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  • Surface finishing of biomaterials by large-area electron beam irradiation

    OKADA Akira

    57 ( 6 )   357 - 360   2013.6

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  • ワイヤ放電加工の高性能化のための最適ノズルフラッシング法の解明

    岡田晃

    機械技術   61 ( 6 )   32 - 35   2013.6

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  • パルスレーザによる微細溶接

    岡本 康寛, 中芝 伸一, 岡田 晃

    電気加工技術   37 ( 115 )   9 - 16   2013.5

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  • CIRP General Assembly報告

    岡田 晃

    電気加工学会誌   2012.11

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  • 電気加工研究レビュー2011

    岡田晃

    電気加工学会誌   2012.11

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  • 機械工学年鑑 加工学・加工機器 電気・化学加工

    岡田晃

    日本機械学会誌   115 ( 1125 )   579 - 580   2012.8

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  • つり下げ電極による曲がり穴放電加工技術の開発

    山口篤, 岡田晃

    油空圧技術   51 ( 7 )   24 - 28   2012.7

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  • Thermal Fatigue Characteristics of Molding Die Applying Nitriding Treatment on Electrical Beam Irradiated Surface

    SANO Masaaki, HAGIHARA Yoshihito, TAKAO Kiyotoshi, ISHIGURO Teruo, SUZUKI Daisuke, SAKAMOTO Chiaki, OKADA Akira

    36 ( 113 )   7 - 12   2012.6

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  • 大面積電子ビーム照射による金型の高能率表面仕上げ

    岡田晃, 岡本康寛

    レーザ協会誌,36巻,2号pp.36-46   36 ( 2 )   36 - 46   2011.6

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  • 半導体樹脂封止用金型における放電加工面の離型性評価

    北田良二, 岡田 晃, 宇野義幸

    型技術   25 ( 6 )   37 - 40   2010.6

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  • Surface smoothing and surface modification by large-area electron beam irradiation

    UNO Yoshiyuki, OKADA Akira

    Journal of the Japan Society for Abrasive Technology   54 ( 5 )   268 - 271   2010.5

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  • 大面積電子ビーム照射による表面平滑化と表面改質

    宇野義幸, 岡田 晃

    砥粒加工学会誌Vol.54, No.5, pp.12-15   54 ( 5 )   12 - 15   2010.5

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  • ワイヤ放電加工における加工液流れのCFD解析

    岡田 晃,宇野義幸

    電気加工技術   34 ( 106 )   19 - 26   2010.5

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  • 大面積電子ビーム照射による金型表面の高能率平滑化および表面改質 Invited

    岡田晃

    フォームテックレヴューVol.18, No.1,pp.36-41   18 ( 1 )   36 - 41   2009.3

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  • 大面積電子ビーム照射による金型の手磨きレス仕上げ法の開発

    宇野義幸, 岡田晃

    国立大学協会情報誌JANU   11   4   2008.12

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  • 電子ビーム加工 (図解 初心者でもよくわかる 金型加工の基礎 はじめの一歩) -- (最先端の金型加工技術)

    宇野 義幸, 岡田 晃

    型技術   22 ( 11 )   84 - 89   2007.9

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  • 大面積電子ビームによる金型の高能率仕上げ--新たな手磨きレス仕上げプロセス実現に向けて

    岡田 晃, 宇野 義幸

    光アライアンス   17 ( 8 )   50 - 53   2006.8

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  • 放電加工技術の最近の動向と展望 (特集 放電加工技術の最前線)

    宇野 義幸, 岡田 晃

    型技術   21 ( 6 )   14 - 17   2006.5

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  • 大面積電子ビームによる表面改質・鏡面加工技術

    宇野 義幸, 岡田 晃

    機械の研究   58 ( 3 )   339 - 346   2006.3

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  • 電子ビーム照射による放電加工面の改質

    宇野義幸, 岡田 晃

    精密工学会誌   71 ( 5 )   553 - 556   2005.5

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  • 大面積電子ビーム照射による金型表面改質

    宇野義幸, 岡田 晃, 植村賢介, Purwadi RAHARJO

    プレス技術   43 ( 4 )   23 - 28   2005.4

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  • 夢の手磨きレス鏡面仕上げへチャレンジ

    宇野義幸, 岡田晃

    型技術   20 ( 1 )   66 - 67   2005.1

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  • 大面積電子ビーム照射による金型の高能率仕上げ

    宇野義幸, 岡田 晃

    型技術   19 ( 10 )   66 - 67   2004.9

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  • 大面積電子ビーム照射による金型の高能率手磨きレス仕上げ法の開発

    宇野義幸, 岡田 晃, 植村賢介, Purwadi RAHARJO

    機械と工具   48 ( 8 )   42 - 45   2004.8

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  • 電子ビーム照射による金型の高能率仕上げ

    宇野義幸, 岡田 晃

    ツールエンジニア   45 ( 9 )   168 - 171   2004.8

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  • 放電加工面の大面積パルス電子ビームによる高能率仕上げと表面改質

    宇野義幸, 岡田 晃, 植村賢介, Purwadi RAHARJO

    機械技術   52 ( 6 )   46 - 49   2004.6

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  • 大面積電子ビーム照射による生体用チタン合金の高能率表面仕上げ

    宇野義幸, 岡田 晃, 植村賢介, Purwadi RAHARJO

    電気加工技術   28 ( 89 )   9 - 14   2004.6

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  • 大面積パルス電子ビームによる金型の仕上げ加工

    植村賢介, 唐戸幸作, 虞 戦波, 宇野義幸, 岡田 晃

    電鋳・金型表面処理研究会誌   13 ( 1 )   13 - 19   2004.3

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  • 最大ビーム径60mm-大面積電子照射による精密金型の新しい仕上加工法

    宇野義幸, 岡田 晃, 植村賢介, Purwadi RAHARJO

    ツールエンジニア   44 ( 11 )   4 - 47   2003.10

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  • 大面積パルス電子ビームによる金型の仕上げと表面改質

    宇野 義幸, 岡田 晃, 藪下 法康, 植村 賢介, RAHARJO Purwadi

    電気加工技術   27 ( 86 )   12 - 17   2003.6

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  • A New Slicing Method of Monocrystalline Silicon Ingot by Wire EDM

    OKADA Akira, UNO Yoshiyuki, OKAMOTO Yasuhiro, ITOH Hisashi, HIRANO Tameyoshi

    International Journal of Electrical Machining   8   21 - 26   2003.1

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  • 放電加工技術の最近の動向

    宇野義幸, 岡田晃

    機械の研究   53 ( 6 )   14 - 23   2001.6

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  • 放電加工技術の最近の動向

    宇野 義幸, 岡田 晃

    機械の研究   53 ( 6 )   632 - 641   2001.6

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  • バクテリアの金属加工への応用

    宇野義幸, 岡田晃

    高温学会誌   27 ( 1 )   4 - 9   2001

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  • 高能率放電加工法による高速・高精度化技術

    橋川栄二, 宇野義幸, 岡田 晃, 山下弘之

    電気加工技術   23 ( 74 )   25 - 33   2000.9

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  • Electrical Discharge Machining of Monocrystalline Silicon(Special Issue on Recent Progress in Electrical Discharge Machining)

    UNO Yoshiyuki, OKADA Akira, OKAMOTO Yasuhiro

    Journal of the Japan Society of Precision Engineering   64 ( 12 )   1739 - 1742   1998

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    DOI: 10.2493/jjspe.64.1739

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    Other Link: https://jlc.jst.go.jp/DN/JALC/00057546582?from=CiNii

  • 放電加工用高性能グラファイト電極の可能性

    宇野義幸, 岡田 晃, 郭 常寧, 高木 俊

    電気加工技術   20 ( 64 )   11 - 17   1996.5

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  • 水放電に関する基礎的研究

    宇野義幸, 岡田 晃

    電気加工技術   17 ( 57 )   19 - 24   1993.7

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  • 難削材料の高能率放電加工

    宇野義幸, 岡田 晃

    電気加工技術   17 ( 55 )   21 - 26   1993.4

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Presentations

  • 細線ワイヤ放電加工における気泡排出挙動の高速度観察

    宮崎悠,石橋駿,岡田晃,劉世賢,木村匠吾

    電気加工学会全国大会(2022)  2022.11.24  電気加工学会

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    Event date: 2022.11.24 - 2022.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 高性能ワイヤ放電加工のための 油加工液特性の最適化に関する研究 Invited

    岡田晃

    電気加工学会放電基礎現象研究会  2022.10.25  電気加工学会

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    Event date: 2022.10.25

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

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  • 空間光位相変調器を用いたピコ秒パルスレーザ照射によるガラスの微細溶接

    高嶋 諒, 庵谷和希, 岡本康寛, 岡田 晃

    日本機械学会第14回 生産加工・工作機械部門講演会  2022.10.8  日本機械学会

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    Event date: 2022.10.7 - 2022.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 熱流体解析による大面積電子ビーム照射におけるエッジ部形状変化メカニズムの解明

    田島響, 篠永東吾, 岡本康寛, 岡田晃

    日本機械学会第14回生産加工・工作機械部門講演会  2022.10.7  日本機械学会

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    Event date: 2022.10.7 - 2022.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 公転球電極を用いた内部空間形状放電加工の回転数サーボ制御による加工特性の改善

    藤枝幸大, 岡田 晃, 山口 篤

    日本機械学会2022年度年次大会  2022.9.12  日本機械学会

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    Event date: 2022.9.11 - 2022.9.14

    Language:Japanese   Presentation type:Poster presentation  

    Venue:富山  

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  • 走査方向配置ツインスポットビームを用いた高品位ファイバレーザ切断法に関する基礎的研究

    甲斐直人, 森本紘太, 岡本康寛, 岡田 晃, 石黒宏明, 伊藤亮平, 大河弘志

    2022年度溶接学会秋季全国大会  2022.9.9 

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    Event date: 2022.9.8 - 2022.9.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 斜め照射CWレーザの高速走査による金属表面への微細溝形成に焦点位置が及ぼす影響

    齊藤 陸, 田浦のぞみ, 岡本康寛, 岡田 晃, 坂井辰彦

    2022年度精密工学会春季大会学術講演会  2022.3.17 

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    Event date: 2022.3.15 - 2022.3.17

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  • タンデムガイドを用いた曲がり穴放電加工の基礎的研究

    山口篤, 因幡勇汰, 藤枝幸大, 岡田晃

    2022年度精密工学会春季大会学術講演会  2022.3.15 

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    Event date: 2022.3.15 - 2022.3.17

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  • 放電加工仕上げによる組成傾斜表面層形成に関する基礎的研究

    杖谷俊一郎, 岡田晃, 北田良二

    日本機械学会中国四国支部第60期講演会  2022.3.4  日本機械学会

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    Event date: 2022.3.4

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  • ワイヤ放電加工における加工液ノズルフラッシングの数値流体解析 Invited

    岡田晃

    精密工学会難削材加工専門委員会 111回委員会  2022.1.26  精密工学会

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    Event date: 2022.1.26

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:オンライン  

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  • マルテンサイト系ステンレス鋼AM造形物の表面性状に関する研究

    松田悠生, 篠永東吾, 山口篤, 岡田晃

    2023年度精密工学会中国四国支部・九州支部共催‐広島地方講演会‐  2023.12.9  精密工学会

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    Event date: 2023.12.9

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  • 硬脆材料のマルチワイヤ放電スライシングにおける加工溝幅均一性向上に関する検討

    吉田匠, 越中脩太, 岡本康寛, 岡田晃, 栗原治弥

    2023年度精密工学会中国四国支部・九州支部共催‐広島地方講演会‐  2023.12.9  精密工学会

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    Event date: 2023.12.9

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  • C/Cコンポジット電極の放電加工特性に関する基礎的研究

    吉田光希, 岡田晃

    2023年度精密工学会中国四国支部・九州支部共催‐広島地方講演会‐  2023.12.9  精密工学会

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    Event date: 2023.12.9

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  • 細線ワイヤ放電加工における加工粉排出状況に関する研究

    石橋駿, 木村匠吾, 佐藤亮太, 岡田晃

    電気加工学会全国大会(2023)  2023.12.1  電気加工学会

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    Event date: 2023.11.30 - 2023.12.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 油加工液の冷却能がワイヤ放電加工特性に及ぼす影響

    劉世賢, 坂田蓮, 岡田晃, 北村友彦

    電気加工学会全国大会(2023)  2023.12.1  電気加工学会

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    Event date: 2023.11.30 - 2023.12.1

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  • 超硬合金のCo含有量が細線ワイヤ放電加工特性に及ぼす影響

    黒田雄斗, 篠永東吾, 岡田晃

    電気加工学会全国大会(2023)  2023.12.1  電気加工学会

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    Event date: 2023.11.30 - 2023.12.1

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  • ロングパルス電子ビーム照射による金属AM造形物の表面平滑化

    趙旭澤, 篠永東吾, 余田裕之, 山口篤, 岡田晃

    電気加工学会全国大会(2023)  2023.11.30  電気加工学会

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    Event date: 2023.11.30 - 2023.12.1

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  • 大面積電子ビーム照射による金属AM造形物のめっき皮膜欠陥抑制

    篠永東吾, 松田悠生, 岡田晃

    電気加工学会全国大会(2023)  2023.11.30  電気加工学会

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    Event date: 2023.11.30 - 2023.12.1

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  • EBポリッシングによる金属AMラティス構造体の表面平滑化に関する研究

    三浦誠也, 篠永東吾, 山口篤, 岡田晃

    2023年度精密工学会秋季大会学術講演会  2023.9.13  精密工学会

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    Event date: 2023.9.13 - 2023.9.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • つり下げ電極を用いた放電加工による金属AM造形流路穴のサポート除去,

    山口篤, 藤枝幸大, 松本虎太郎, 岡田晃

    2023年度精密工学会秋季大会学術講演会  2023.9.13  精密工学会

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    Event date: 2023.9.13 - 2023.9.15

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  • 油加工液の体積低効率がワイヤ放電加工特性に及ぼす影響

    劉世賢, 岡田晃, 北村友彦

    型技術者会議2023  2023.6.23  型技術協会

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    Event date: 2023.6.22 - 2023.6.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 細線ワイヤ放電加工における加工粉排出挙動の高速度観察

    石橋駿, 宮崎悠, 岡田晃

    型技術者会議2023  2023.6.23  型技術協会

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    Event date: 2023.6.22 - 2023.6.23

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • パルス照射条件が熱可塑性炭素繊維強化プラスチックのレーザフォーミング特性に及ぼす影響の基礎的検討

    木崎 晟那, 渡辺 里奈, 北田 良二, 岡本 康寛, 岡田 晃

    2023年度精密工学会春季大会学術講演会  2023.3.16  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 走査方向配置ツインスポットビームを用いた鉄鋼材料のファイバレーザ切断特性に関する研究

    森本紘太, 甲斐直人, 岡本康寛, 岡田 晃, 石黒宏明, 伊藤亮平, 大河弘志

    2023年度精密工学会春季大会学術講演会  2023.3.16  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

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  • 研削加工面に対する熱硬化性フェノール樹脂の圧縮成形における離型性の基礎的評価

    王欽, 大庭侑太郎, 北田良二, 杖谷俊一郎, 岡田 晃

    2023年度精密工学会春季大会学術講演会  2023.3.16  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • つり下げ電極を用いた放電加工による金属AM造形曲がり穴内面仕上げの基礎的 研究

    藤枝幸大, 山口篤, 岡田晃

    2023年度精密工学会春季大会学術講演会  2023.3.14  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 細線ワイヤ放電加工における加工粉排出挙動の高速度観察

    石橋 駿, 宮﨑 悠, 岡田 晃

    2023.3.14  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

    Language:Japanese  

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  • 放電加工における気泡の膨張収縮挙動の数値流体解析

    木村匠吾, 劉 世賢, 岡田 晃

    2023年度精密工学会春季大会学術講演会  2023.3.14  精密工学会

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    Event date: 2023.3.14 - 2023.3.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 空間光位相変調器を用いたガラスの微細レーザ溶接における溶融領域形状の制御

    庵谷和希, 高嶋 諒, 岡本康寛, 岡田 晃

    2022年度精密工学会九州支部・中国四国支部共催久留米地方講演会  2022.12.3  精密工学会

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    Event date: 2022.12.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:久留米  

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  • ノズルフラッシングによる 工作物端面付近加工時のワ イヤ放電加工特性の変化

    木村匠吾, 岡田晃, 栗原治弥

    2022年度精密工学会九州支部・中国四国支部共催久留米地方講演会  2022.12.3  精密工学会

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    Event date: 2022.12.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:久留米  

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  • 大面積電子ビーム照射によるAl-Cu合金の金属間化合物微細化に関する研究

    宮本郁也, 篠永東吾, 岡田晃

    電気加工学会全国大会(2022)  2022.11.25  電気加工学会

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    Event date: 2022.11.24 - 2022.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • 熱流体解析による凹凸平均間隔がEBポリッシング効果に及ぼす影響の解明

    小林裕野, 篠永東吾, 三浦誠也, 岡田晃, 辻俊哉

    電気加工学会全国大会(2022)  2022.11.25  電気加工学会

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    Event date: 2022.11.24 - 2022.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • タンデムガイド付きつり下げ電極による屈曲深穴放電加工

    山口篤, 藤枝幸大, 岡田晃

    電気加工学会全国大会(2022)  2022.11.24  電気加工学会

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    Event date: 2022.11.24 - 2022.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋  

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  • Fiber laser cutting of steel materials with twin spot beam-twin spot setting in kerf width direction International conference

    Kota Morimoto, Atsushi Yagi, Naoto Kai, Yasuhiro Okamoto, Akira Okada, Hiroaki Ishiguro, Ryohei Ito, Akihiko Sugiyama, Hiroshi Okawa

    41th International Congress on Applications of Lasers & Electro-Optics 2022  2022.10.18 

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    Event date: 2022.10.17 - 2022.10.19

    Language:English   Presentation type:Oral presentation (general)  

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  • ナノ秒パルスレーザと酸洗浄を用いた単結晶ダイヤモンドの高品位微細形状創成に関する基礎的検討

    河田開智, 大久保翼, 岡本康寛, 岡田 晃

    日本機械学会第14回 生産加工・工作機械部門講演会  2022.10.8  日本機械学会

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    Event date: 2022.10.7 - 2022.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • レーザフォーミングによる熱可塑性炭素繊維強化プラスチック板の曲げ加工の基礎的検討

    渡辺里奈, 木崎晟那, 北田良二, 岡本康寛, 岡田晃

    日本機械学会第14回 生産加工・工作機械部門講演会  2022.10.8  日本機械学会

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    Event date: 2022.10.7 - 2022.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 銅ダイヤモンド複合材料の放電加工用電極性能に関する基礎検討

    杖谷俊一郎, 𠮷田光希, 岡田晃, 河野佐季

    日本機械学会第14回 生産加工・工作機械部門講演会  2022.10.7  日本機械学会

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    Event date: 2022.10.7 - 2022.10.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:金沢  

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  • 銅とアルミニウムのレーザ溶接における照射方法に関する基礎的研究

    越智 彬裕, 岡本 康寛, 岡田晃, 林 佳佑, 山村 健, 長崎 克俊, 豆野 和延, 西 則男

    2022年度溶接学会秋季全国大会  2022.9.9 

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    Event date: 2022.9.8 - 2022.9.10

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • パルスレーザによる単結晶ダイヤモンドの高品位加工 Invited

    岡本康寛, 大久保翼, 岡田 晃

    235 回電気加工研究会  2022.6.24  電気加工学会

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    Event date: 2022.6.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • ノズルフラッシング下での加工位置によるワイヤ 放電加工特性の違い

    木村匠吾, 岡田晃, 栗原治弥

    型技術者会議2022  2022.6.23  型技術協会

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    Event date: 2022.6.23 - 2022.6.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • 油加工液の動粘度がワイヤ放電加工特性に及 ぼす影響

    劉世賢, 岡田晃, 北村友彦

    型技術者会議2022  2022.6.23  型技術協会

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    Event date: 2022.6.23 - 2022.6.24

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京  

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  • Study on Improving Application of Compressive Residual Stress in ns Pulsed Laser Peening of High-strength Steel International conference

    Pan Hao, Kohei Umezu, Yasuhiro Okamoto, Yoshihiro Sakino, Akira Okada

    23rd International Symposium on Laser Precision Microfabrication LPM2022  2022.6.8 

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    Event date: 2022.6.7 - 2022.6.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Study on Molten Metal Behavior and Formation Mechanism of Micro-structure by High-Speed Scanning of Angled CW Laser Irradiation International conference

    Tatsuhiko Sakai, Nozomi Taura, Riku Saito, Yasuhiro Okamoto, Akira Okada

    16th International Conference on Laser Ablation  2022.4.27 

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    Event date: 2022.4.24 - 2022.4.29

    Language:English   Presentation type:Oral presentation (general)  

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  • Study on Irradiation Method of Near-infrared Laser Beam in Welding of Copper International conference

    Akihiro Ochi, Yasuhiro Okamoto, Akira Okada, Takeshi Yamamura, Norio Nishi

    4th Smart Laser Processing Conference SLPC2022  2022.4.21  Japan Laser Processing Society

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    Event date: 2022.4.19 - 2022.4.21

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Yokohama  

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  • 熱流体解析によるEB ポリッシングメカニズムの解明

    太田翔也, 田島 響, 篠永東吾, 岡本康寛, 岡田 晃

    2022年度精密工学会春季大会学術講演会  2022.3.15 

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    Event date: 2022.3.15 - 2022.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射による陽極酸化被膜特性の向上

    宮本郁也, 渡部隼, 篠永東吾, 岡田晃

    2022年度精密工学会春季大会学術講演会  2022.3.15  精密工学会

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    Event date: 2022.3.15 - 2022.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

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  • 空間位相変調器を用いたガラスの微細レーザ溶接に関する基礎的検討

    庵谷 和希, 岡本 康寛, 岡田 晃

    第 28回「エレクトロニクスにおけるマイクロ接合・実装技術」シンポジウム  2022.2.3 

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    Event date: 2022.2.1 - 2022.2.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 熱硬化性フェノール樹脂の圧縮成形における切削加⼯⾯の離型性に関する基礎的検討

    北田良二, 天本翔二, 秋山晃太朗, 杖谷俊一郎, 岡田晃

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • 炭酸ガスレーザを用いた熱可塑性炭素繊維強化プラスチックのフォーミング形状の基礎的検討

    北田良二, 園田涼平, 園田湧真, 岡本康寛, 岡田晃

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • CWレーザの斜め照射と高速走査による金属表面への微細溝形成とそのメカニズムに関する検討

    田浦のぞみ, 光延晃也, 岡本康寛, 岡田晃, 坂井辰彦

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • ファイバレーザ切断における光強度分布適正化を用いたドロス高さ低減法に関する基礎的検討

    甲斐直人, 門永星護, 岡本康寛, 岡田晃, 杉山明彦, 石黒宏明, 伊藤亮平, 藤田理央, 大河弘志

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • マルチワイヤ放電スライシングにおいてワイヤ走行により形成される加工液流れの基礎的検討

    田淵愁笙, 竹川智也, 岡本康寛, 岡田晃, 栗原治弥

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • 油加工液の動粘度がワイヤ放電加工特性に及ぼす影響

    劉世賢, 岩井宏樹, 岡田晃, 北村友彦

    2021年度精密工学会春季大会学術講演会 

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    Event date: 2021.3.16 - 2021.3.18

    Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射によるマレージング鋼表面のMo濃化

    渡部隼,篠永東吾,岡田晃,山口篤

    電気加工学会全国大会(2020) 

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    Event date: 2020.11.19

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  • 大面積電子ビームを用いたマイクロフィレット加工の曲率半径変化予測

    篠永東吾,周澤華,岡田晃,井上基弘

    電気加工学会全国大会(2020) 

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    Event date: 2020.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 曲がり穴放電加工における箔支持ガイドを用いた形状精度の改善

    因幡勇汰,白神翔,岡田晃,山口篤

    電気加工学会全国大会(2020) 

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    Event date: 2020.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 熱硬化性フェノール樹脂の圧縮成形における形彫り放電加工面の離型性

    北田良二,秋山晃太朗,天本翔二,池内祐貴,岡田晃

    電気加工学会全国大会(2020) 

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    Event date: 2020.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 加工液ノズル噴射が工作物板厚変化時のワイヤ放電加工特性に及ぼす影響

    岩井宏樹,岡田晃,栗原治弥

    電気加工学会全国大会(2020) 

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    Event date: 2020.11.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 熱可塑性炭素繊維強化プラスチックのレーザフォーミング法に関する基礎的検討

    北田良二,岡本康寛,岡田 晃

    2020年度精密工学会秋季大会学術講演会 

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    Event date: 2020.9.1 - 2020.9.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 放電加工による二層構造表面層形成に関する基礎的検討

    池内祐貴,杖谷俊一郎,北田良二,岡田晃

    2020年度精密工学会秋季大会学術講演会 

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    Event date: 2020.9.1 - 2020.9.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超短パルスレーザを用いた表面テクスチャリングによる鉄鋼系金型の撥水性制御に関する基礎的研究

    村田健太朗,篠永東吾,岡本康寛,岡田 晃

    2020年度精密工学会秋季大会学術講演会 

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    Event date: 2020.9.1 - 2020.9.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 放電加工面と熱硬化性樹脂の離型力測定法の基礎的検討

    北田 良二, 藤井 圭太, 池内 祐貴, 岡田 晃

    2020年度精密工学会春季大会学術講演会 

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    Event date: 2020.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • グループ給電方式マルチワイヤ放電スライシングにおける極間検出電圧変動域制御法の検討

    竹川智也,田淵愁笙,岡本康寛,岡田 晃,栗原治弥

    2020年度精密工学会春季大会学術講演会 

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    Event date: 2020.3.17

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  • ピコ秒パルスレーザを用いた間隙を有するガラス板同士の接合

    藤原拓海,欧?智勇,岡本康寛,岡田 晃

    2020年度精密工学会春季大会学術講演会 

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    Event date: 2020.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 加工液ノズル噴射がワイヤ放電加工に及ぼす影響 Invited

    岡田晃

    電気加工学会 放電加工基礎研究会 

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    Event date: 2020.1.15

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • マルチワイヤ放電スライシング Invited

    岡本康寛,岡田晃

    電気加工学会 放電加工基礎研究会 

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    Event date: 2020.1.15

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  • 放電加工による二層構造仕上げ面形成の可能性

    池内祐貴,藤井圭太,岡田晃,北田良二

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ファイバレーザを用いた鉄鋼材料の窒素切断におけるドロス低減に関する基礎的研究

    矢木敦士,門永星護,岡本康寛,岡田 晃,石黒宏明,伊藤亮平,溝口祐也,杉山明彦,藤田理央

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • マイクロ秒パルスレーザを用いた金型材料の微細領域表面粗低減法に関す基礎的検討

    梅津皓平,小崎拓朗,岡本康寛,岡田 晃

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ワイヤ放電加工におけるノズル噴射が工作物板厚変化時のワイヤ断線に及ぼす影響

    岩井宏樹,蛭子奉紀,岡田晃,栗原治弥

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • つり下げ電極を用いた放電加工における加工液ノズル噴射の影響

    因幡雄汰,李碩勛,岡田晃,山口篤

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 形彫放電加工面における熱硬化性樹脂の離型試験法

    北田 良二,藤井圭太,岡田晃

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射によるマルエージング鋼の表面改質に関する基礎的検討

    渡部 隼,渡邊泰生,篠永東吾,岡田晃,山口篤

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

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  • 液相上の固相金属に対するレーザ穴加工プロセスとその貫通検出法の検討

    田浦のぞみ,川?千佳子,岡本康寛,岡田 晃,坂井辰彦

    2019年度精密工学会九州支部・中国四国支部共催 佐世保地方講演会 

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    Event date: 2019.12.14

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射によるマイクロフィレット加工の可能性

    篠永東吾,周澤華,岡田晃,井上基弘

    電気加工学会全国大会(2019) 

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    Event date: 2019.11.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射によるアルミニウム合金AM造形物の表面性状改善

    渡邊泰生,篠永東吾,山口篤,岡田晃

    電気加工学会全国大会(2019) 

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    Event date: 2019.11.21

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  • 六ホウ化ランタンのワイヤ放電加工特性に関する基礎的研究

    藤井 圭太 ,池内祐貴,岡田 晃

    電気加工学会全国大会(2019) 

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    Event date: 2019.11.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ワイヤ放電加工における加工粉排出性向上のためのノズル形状の検討

    蛭子 奉紀, 岩井宏樹, 岡田 晃, 栗原 治弥

    電気加工学会全国大会(2019) 

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    Event date: 2019.11.21

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • テクスチャリングと表面改質を併用した接着継手の強度信頼性に関する研究

    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&M2019材料力学カンファレンス 

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    Event date: 2019.11.2

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射法を用いたフィレット加工の基礎的検討

    周澤華,酒井翼,篠永東吾,岡田晃

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • γ相黄銅メッキ細線ワイヤの微細ワイヤ放電加工特性に関する基礎的検討

    三好雅人,岡田晃,榎本孝章,棗田善貴

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

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  • 放電加工による三次元空間形状の創成に関する基礎的研究

    李碩?,因幡勇汰,岡田晃,山口篤

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

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  • つり下げ電極を用いた曲がり穴放電加工法における形状自由度の拡大

    山口篤,浜口和也,李碩?,因幡勇汰,岡田晃

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 炭酸ガスレーザを用いた炭素繊維強化プラスチックのレーザフォーミングに関する基礎的研究

    北田 良二,岡本 康寛,岡田 晃

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 近赤外レーザを用いた銅の微細溶接における開口数と表面粗さの影響

    川崎将大,濱田一樹,岡本康寛,岡田 晃,西則男,酒川友一

    日本機械学会第13回 生産加工・工作機械部門講演会 

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    Event date: 2019.10.4 - 2019.10.5

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  • ナノ秒パルスファイバーレーザを用いた単結晶ダイヤモンドに対する高品位微細加工

    梶谷敦也,岡本康寛,岡田 晃

    2019年度精密工学会秋季大会学術講演会 

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    Event date: 2019.9.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Development of New Material Processes by Applying Electrical Machining Methods Invited International conference

    Akira Okada

    2019台湾電気加工学会国際シンポジウム 

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    Event date: 2019.5.30

    Language:English   Presentation type:Oral presentation (keynote)  

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  • ジルコニアの大面積電子ビーム照射における温度場が耐摩耗性に及ぼす影響

    篠永東吾,木村充宏,岡田 晃,井上基弘

    2019年度精密工学会春季大会学術講演会 

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    Event date: 2019.3.13 - 2019.3.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 初期表面粗さに起因するLIPSSの形状変化に及ぼすレーザ照射条件の影響

    和田祐樹,篠永東吾,岡本康寛,岡田 晃

    2019年度精密工学会春季大会学術講演会 

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    Event date: 2019.3.13 - 2019.3.15

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 連続発振レーザの高速走査を用いた微細溝形成に関する基礎的検討

    片山千絵,北川 京,岡本康寛,岡田 晃

    日本機械学会中国四国支部第57期講演会 

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    Event date: 2019.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 六ホウ化ランタンの放電加工特性に関する基礎的研究

    藤井 圭太 ,桑田 彩花,岡田 晃

    日本機械学会中国四国支部第57期講演会 

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    Event date: 2019.3.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 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 

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    Event date: 2019

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  • 大面積電子ビーム照射法を用いた金属AM造形物の表面欠陥修復

    篠永東吾,山口 篤,渡邊泰生,木村充宏,岡田 晃

    電気加工学会全国大会(2018) 

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    Event date: 2018.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射法による高アスペクト比穴底面仕上げ

    木村充宏,篠永東吾,岡田 晃,井上基弘

    電気加工学会全国大会(2018) 

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    Event date: 2018.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 放電加工を用いた骨伝導性を有する高機能チタン合金表面の創成

    飯田勇太,篠永東吾,岡田 晃

    電気加工学会全国大会(2018) 

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    Event date: 2018.11.29

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 溶接困難材料の高効率・高品位レーザ溶接

    岡本康寛,Martin Ruthandi Maina,濱田一樹,川崎将大,岡田 晃

    第18回国際工作機械技術者会議 

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    Event date: 2018.11.3 - 2018.11.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ファイバレーザを用いた軟鋼厚板切断における加工溝傾斜角低減に関する検討

    門永星護,北川 京,岡本康寛,岡田 晃,石黒宏明,伊藤亮平,杉山明彦,三吉弘信,長瀬絢子

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 液相上の固相金属に対するレーザ穴加工プロセスとその貫通検出法

    川?千佳子,岡本康寛,岡田 晃,今井浩文

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 銅の微細レーザ溶接における表面性状と光吸収特性に関する研究

    川崎将大,濱田一樹,岡本康寛,岡田 晃,中芝伸一,酒川友一

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ワイヤ放電加工における加工粉排出向上のための最適ノズルフラッシング条件の検討

    小谷紗希,蛭子 奉紀, 岡田 晃, 栗原 治弥

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 金属AM造形物の大面積電子ビーム表面欠陥修復法に関する基礎的研究

    渡邊泰生,木村充宏,篠永東吾,岡田 晃,山口 篤

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

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  • ピコ秒パルスレーザを用いた単結晶ダイヤモンドに対する高品位微細加工

    梶谷敦也,下瀬貴大,岡本康寛,篠永東吾,岡田 晃

    2018年度精密工学会中国四国支部香川地方学術講演会 

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    Event date: 2018.10.27

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • グリーンマイクロ秒パルスレーザによる金型材料の表面粗さ低減に関する検討

    小崎拓朗,篠永東吾,岡本康寛,岡田 晃

    第12回日本機械学会 生産加工・工作機械部門講演会 

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    Event date: 2018.10.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 実用金属材料の曲がり穴放電加工における工作物振動の効果と加工穴小径化

    太田 浩平, 李 碩?, 岡田 晃, 山口 篤

    第12回日本機械学会 生産加工・工作機械部門講演会 

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    Event date: 2018.10.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ワイヤ放電加工における加工粉排出向上のためのノズル噴射法の検討

    蛭子 奉紀, 小谷 紗季, 岡田 晃, 栗原 治弥

    第12回日本機械学会 生産加工・工作機械部門講演会 

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    Event date: 2018.10.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 工作物の磁性が大面積電子ビーム照射における除去および改質層厚さに与える影響

    酒井 翼,周 澤華,篠永東吾,岡田 晃

    第12回日本機械学会 生産加工・工作機械部門講演会 

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    Event date: 2018.10.13

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射による金属AM造形物表面平滑化の可能性

    山口 篤,渡邊泰生,篠永東吾,岡田 晃

    2018年度精密工学会秋季大会学術講演会 

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    Event date: 2018.9.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • アルミニウム合金の高速レーザ溶接において強度分布がビード表粗さに及ぼす影響

    岡本 康寛,Maina Martin Ruthandi,岡田 晃, N?rhi Matti, Kangastupa Jarno,Vihinen Jorma

    2018年度精密工学会秋季大会学術講演会 

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    Event date: 2018.9.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積電子ビーム照射によるジルコニアの耐摩耗性向上

    篠永東吾,木村充宏,岡田 晃,井上基弘

    2018年度精密工学会秋季大会学術講演会 

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    Event date: 2018.9.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • クロム粉末混入放電加工による高機能金型表面の創成

    藤井圭太,岡田晃,北田良二

    型技術者会議2018 

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    Event date: 2018.6.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ファイバレーザを用いた軟鋼厚板切断における加工溝傾斜角の改善に関する基礎的研究

    北川 京,岡本康寛,篠永東吾,岡田 晃,石黒宏明,杉山明彦,三吉弘信,伊藤亮平

    2018年度精密工学会春季大会学術講演会 

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    Event date: 2018.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ガラスのピコ秒パルスレーザ溶接において溶融領域がガラスの接合強度に及ぼす影響

    荻野雄太,欧?智勇,岡本康寛,篠永東吾,岡田 晃

    2018年度精密工学会春季大会学術講演会 

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    Event date: 2018.3.17

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  • 大面積電子ビーム照射による改質層厚さに工作物の物性値が与える影響

    篠永 東吾, 木村 恭彰, 酒井 翼, 岡田 晃

    2018年度精密工学会春季大会学術講演会 

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    Event date: 2018.3.16

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  • 超短パルスによる非金属材料のレーザ接合

    岡本康寛,岡田 晃

    2018年度精密工学会春季大会学術講演会シンポジウム 

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    Event date: 2018.3.16

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • つり下げ電極によるチタン合金の放電加工特性と曲がり穴加工

    山口 篤, 太田 浩平, 李 碩?, 岡田 晃

    2018年度精密工学会春季大会学術講演会 

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    Event date: 2018.3.15

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  • 大面積電子ビーム照射における工作物表面温度分布の解明

    酒井 翼, 木村 恭彰, 篠永 東吾, 岡田 晃

    日本機械学会中国四国支部第56期講演会 

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    Event date: 2018.3.7

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  • 黄銅めっきCuZrワイヤの表面状態がワイヤ放電加工特性に及ぼす影響

    桑田 彩花, 岡田 晃, 村松 尚国, 野村 和弘

    日本機械学会中国四国支部第56期講演会 

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    Event date: 2018.3.7

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  • チタンの初期表面粗さが超短パルスレーザ誘起ナノ周期構造の形状に及ぼす影響

    和田祐樹,木下奨之,篠永東吾,岡本康寛,岡田 晃

    日本機械学会中国四国支部第56期講演会 

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    Event date: 2018.3.7

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  • 非固定電極を用いた放電加工による曲がり穴の創成

    岡田 晃

    日本金属プレス工業協会 ホットスタンピング研究部会 

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    Event date: 2018.3.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • クロム粉末混入加工液を用いた放電仕上げ面の高機能化

    藤井圭太,王瑞祥,岡田晃,北田良二

    電気加工学会全国大会(2017) 

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    Event date: 2017.12.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 2nd-cutワイヤ放電仕上げ時のノズルフラッシングが加工液流れに及ぼす影響

    川田晃嘉,蛭子奉紀,岡田 晃,栗原治弥

    電気加工学会全国大会(2017) 

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    Event date: 2017.12.1

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  • 大面積電子ビーム照射法におけるビーム誘導による穴底面平滑化の可能性

    木村充宏,篠永東吾,岡田 晃,井上基弘

    電気加工学会全国大会(2017) 

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    Event date: 2017.11.30

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • チタン合金表面への骨伝導性付与のための放電加工条件の最適化

    飯田勇太,篠永東吾, 岡田 晃,木村光臣

    2017年度精密工学会中国四国支部鳥取地方学術講演会 

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    Event date: 2017.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 液相上の固相金属に対するレーザ穴加工とその貫通検出法に関する基礎的検討

    川?千佳子,伊藤瑞菜,岡本康寛,篠永東吾,岡田 晃,今井浩文

    2017年度精密工学会中国四国支部鳥取地方学術講演会 

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    Event date: 2017.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • つり下げ電極を用いた曲がり穴放電加工法における工作物振動の効果と小径穴加工の安定化

    太田浩平,李 碩?,岡本康寛,岡田 晃,山口 篤

    2017年度精密工学会中国四国支部鳥取地方学術講演会 

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    Event date: 2017.11.25

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  • Nd:YAGレーザを用いた銅の微細溶接における光吸収特性 ?光吸収率と溶融量の評価?

    濱田一樹,井上礼輝,岡本康寛,篠永東吾,岡田 晃,中芝伸一,酒川友一

    2017年度精密工学会中国四国支部鳥取地方学術講演会 

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    Event date: 2017.11.25

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  • パルスレーザを用いた銀ナノワイヤ透明導電膜に対する絶縁領域形成とその評価

    田中康貴,下瀬貴大,岡本康寛,篠永東吾,岡田 晃,西 則男

    2017年度精密工学会中国四国支部鳥取地方学術講演会 

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    Event date: 2017.11.25

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 大面積パルス電子ビーム照射による金型の表面仕上げ

    下瀬貴大,大下雅史,岡本康寛,西 則男,篠永東吾,岡田 晃

    2017年度精密工学会秋季大会学術講演会シンポジウム 

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    Event date: 2017.9.22

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超短パルスレーザを用いた銀ナノワイヤ透明導電膜の除去特性に偏光方向が及ぼす影響

    下瀬貴大,大下雅史,岡本康寛,西 則男,篠永東吾,岡田 晃

    2017年度精密工学会秋季大会学術講演会 

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    Event date: 2017.9.21

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  • 大面積電子ビーム照射における凸形状変化の数値解析的予測に関する研究

    木村恭彰,酒井 翼,篠永東吾,岡田 晃

    2017年度精密工学会秋季大会学術講演会 

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    Event date: 2017.9.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 細胞配向性向上のための超短パルスレーザによる表面形状制御に関する研究

    篠永東吾,木下奨之,和田祐樹,岡本康寛,岡田 晃

    2017年度精密工学会秋季大会学術講演会 

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    Event date: 2017.9.20

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • めっきCu-Zrワイヤによるワイヤ放電加工特性の向上

    桑田彩花,岡田晃,千葉広樹

    型技術者会議2017 

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    Event date: 2017.6.20

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  • スタート穴を用いたワイヤ放電加工開始時におけるノズルフラッシングがワイヤ断線に及ぼす影響

    川田晃嘉,岡本康寛,岡田 晃,栗原治弥

    2017年度精密工学会春季大会学術講演会 

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    Event date: 2017.3.14

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  • マルチワイヤ放電スライシング法における加工溝幅均一性の検討

    岡本康寛,金谷雅仁,池田崇之,栗原治弥,岡田 晃,木戸正孝

    2017年度精密工学会春季大会学術講演会 

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    Event date: 2017.3.14

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  • 開口数がピコ秒レーザによるガラスの微細溶融溶接特性に及ぼす影響

    篠永東吾,太田元基,渡邉大祐,岡本康寛,岡田 晃

    2017年度精密工学会春季大会学術講演会 

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    Event date: 2017.3.14

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  • 純チタンの鉛直面リモートレーザ溶接における広範囲アルゴンガスシールド法

    北川 京,横原和男,篠永東吾,岡本康寛,岡田 晃,落合彦太郎,木村陵介,小野昇造,赤瀬雅之

    2017年度精密工学会春季大会学術講演会 

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    Event date: 2017.3.13

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  • グループ給電方式を用いた円形断面材料のマルチワイヤ放電スライシング

    金谷雅仁,池田崇之,岡本康寛,岡田 晃,栗原治弥,木戸正孝

    日本機械学会中国四国支部第55期講演会 

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    Event date: 2017.3.7

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  • ナノ秒パルスレーザを用いた軟鋼材の加工においてパルス幅が材料到達エネルギーに及ぼす影響

    伊藤 瑞菜,篠永 東吾,岡本康寛,岡田 晃

    レーザー学会第37回年次大会 

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    Event date: 2017.1.7

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  • ワイヤ放電技術を用いた マルチスライシングへの取り組み

    岡本康寛,岡田 晃

    (独)日本学術振興会「結晶加工と評価技術」第145委員会 第151回研究会 

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    Event date: 2016.12.14

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  • ピコ秒パルスレーザによるガラスの微細溶融溶接の安定化

    岡本康寛,岡田 晃

    第86回レーザ加工学会講演会