Faculty Profiles - OKADA Akira

Papers - OKADA Akira

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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

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

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