Faculty Profiles - OKADA Akira

Papers - OKADA Akira

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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

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

Authorship：Last author,　Corresponding 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

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

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

High-quality Welding of Copper and Aluminum by Angled Laser Irradiation and Insert Metals Reviewed

Yasuhiro Okamoto, Yuki Yamada, Akira Okada, Masaki Miyake, Takeshi Yamamura, Katsutoshi Nagasaki, Norio Nishi

Proceedings of 43rd International Congress on Applications of Lasers & Electro-Optics 2024 2024.11

Fundamental study on dielectric oil viscosity for high-performance wire EDM Reviewed International journal

Shixian Liu, Akira Okada, Tomohiko Kitamura

The International Journal of Advanced Manufacturing Technology 135 ( 7-8 ) 3451 - 3461 2024.10

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

Abstract

Dielectric oil has been recently used in wire electrical discharge machining (wire EDM) for achieving high-precision machining. However, the influence of dielectric oil properties on wire EDM characteristics has not been clarified sufficiently. This study fundamentally investigated the influence of dielectric oil viscosity on wire EDM characteristics. In this study, three types of dielectric oil differing only in viscosity were prepared and examined. Linear cutting experiment results showed that the removal rate and the machined surface roughness increase with dielectric oil viscosity. Then, the influence of viscosity on crater removal volume was investigated to discuss the cause of the change in removal rate, and it was found that crater removal volume increases with the viscosity. Furthermore, CFD (computational fluid dynamics) analysis results and discharge observation results showed that the debris exclusion becomes worse in higher viscosity oil, and the discharge concentration occurs frequently, resulting in the deterioration in machined surface roughness. Next, the difference in machining accuracy with dielectric oil viscosity was investigated. It was found that the corner shape accuracy deteriorates with the increase of viscosity while the machined surface waviness and straightness improve slightly. Structural analysis results showed that wire deflection increases with viscosity, resulting in the deterioration in corner shape accuracy. On the other hand, high-speed observation of wire vibration was carried out, and it was found that the wire vibration decreases in the case of higher viscosity, which leads to the improvement in machined surface waviness and straightness.

DOI： 10.1007/s00170-024-14693-3

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Other Link： https://link.springer.com/article/10.1007/s00170-024-14693-3/fulltext.html

Fundamental Study on Calcination of Limestone Particles by Near-infrared Wavelength Laser with Vibration Stirring Reviewed

Naoki Kotake, Yasuhiro Okamoto, Masakazu Oka, Shuji Fujiki, Shunjiro, Shizuka, Akira Okada

Proceedings of ICPE2024 Os10-11 2024.10

Influence of Dielectric Oil Cooling-effect on Wire EDM Characteristics Reviewed International journal

Shixian Liu, Ren Sakata, Tomohiko Kitamura, Akira Okada

Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.10

Effect of Chromium Carbide Coating on Mold Releasability from Ground Surface in Compression Molding of Thermosetting Phenol Resin Reviewed

Ryoji Kitada, C. Sun, Q. Wang, K. Yoshida, A. Okada

Proceedings of The 20th International Conference on Precision Engineering 2024.10

Highly Efficient Surface Smoothing of AMed Metal Products by Long-pulse Electron Beam Irradiation Reviewed International journal

Xuze Zhao, Togo Shinonaga, Akira Okada

Proceedings of The 20th International Conference on Precision Engineering 2024.10

Study on Surface Smoothing of Metal Lattice Structures by Large area Electron Beam Irradiation Method Reviewed International journal

Seiya Miura, Togo Shinonaga, Atsushi Yamaguchi, Akira Okada

Proceedings of The 20th International Conference on Precision Engineering 2024.10

Bent and Curved Hole EDM Drilling Using Suspended Ball Electrode with Guides Reviewed

Atsushi YAMAGUCHI, Akira OKADA

Journal of the Japan Society for Precision Engineering 90 ( 9 ) 696 - 700 2024.9

High-speed Observation of Bubble Exclusion Behavior in Fine Wire EDM Reviewed International journal

Shun Ishibashi, Hidetaka Okamoto, Akira Okada

Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.9

Fundamental Study on Wire EDM Characteristics of Copper Diamond Composite Reviewed International journal

Koki Yoshida, a, Jiadong Sun, Akira Okada

Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.9

Effect of Cooling Rate Control on Surface Modified Layer of Al-Cu Alloy by Large-area EB Irraadiation Reviewed International journal

Ayano Sebe, Togo Shinonaga, Akira Okada

Proceedings of Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.9

Study on Surface Topography and Properties of Additively Manufactured Martensitic Stainless Steel Products Reviewed International journal

Yuki Matsuda, Togo Shinonaga, Atsushi Yamaguchi, Akira Okada

Proceedings of Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.9

Fundamental Study on Influence of Residual Stress Distribution on Fatigue Strength in ns Pulsed Laser Peening for Welded High-Strength Steel Reviewed International journal

Shoma Okura, Hao Pan, Yasuhiro Okamoto, Akira Okada, Yoshihiro Sakino, Tomoharu Kato

Proceedings of The 5th International Conference on Machining, Material and Mechanical Technologies (IC3MT 2024) 5 - 11 2024.9

Influence of Material Structure in Cemented Carbide on Fine Wire EDM Characteristics Reviewed International journal

Yuto Kuroda, Yudai Yamagami, Akira Okada

Proceedings of The 5th International Conference on Machining, Materials and Mechanical Technologies (IC3MT2024) 2024.9

Micro-structuring Characteristics on Metal Surface by High-speed Scanning of Angled CW Laser Irradiation Reviewed

Taiki Kawai, Riku Saitou, Atsuhiko Sakai, Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

Technical Digest of the 25th International Symposium on Laser Precision Microfabrication – LPM2024 2024.6

Investigation of Effective Gas Shielding Method for a Wide-area in Vertical-position Laser Welding of Titanium Reviewed International journal

Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

International Journal of Electrical Machining ( 29 ) 20 - 29 2024.3

Study on Surface Smoothing of Ceramics by Large-area Electron Beam Irradiation, Reviewed International journal

International Journal of Electrical Machining ( 29 ) 35 - 40 2024.3

Fundamental Study on Jetting Nozzle Diameter for Smooth Debris Exclusion in WIre EDM Reviewed International journal

Shixian Liu, Akira Okada

International Journal of Electrical Machining 29 27 - 34 2024.3

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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Other Link： https://iopscience.iop.org/article/10.1088/2631-7990/ac5a6a/pdf

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：SAGE Publications

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Fundamental study on internal space forming by EDM Reviewed

Yuta Inaba, Shuoxun Li, Atsushi Yamaguchi, Akira Okada

Procedia CIRP 95 215 - 219 2020

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

85 ( 4 ) 359 - 364 2019.4

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

玉置司,植村賢介,岡田晃,宇野義幸

精密工学会誌 78 ( 1 ) 72 - 76 2012

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

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

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

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

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

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

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

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

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

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

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

Sho Ichii, Akira Okada, Yasuhiro Okamoto

PROGRESS OF MACHINING TECHNOLOGY 215 - 218 2012

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

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

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

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

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

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

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

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

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

Improvement of Razor Blade Surface Integrity by Plasma Nitriding Reviewed

Tsukasa Tamaoki, Kensuke Uemura, Akira Okada, Yoshiyuki Uno