研究者詳細 - 岡田　晃

論文 - 岡田　晃

分割表示 396 件中 201 - 220 件目／全件表示 >>

つり下げ電極を用いた放電加工による曲がり穴加工法の開発 ?つり下げ構造の最適化と複雑曲がり穴加工の可能性? 査読

山口篤, 岡田晃, 三宅達也

精密工学会誌 81 ( 5 ) 435 - 440 2015年

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査読

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年

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

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

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

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Trans Tech Publications Ltd

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

DOI： 10.4028/www.scientific.net/KEM.656-657.461

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Study on surface characteristics of EDMed surface with nickel powder mixed fluid 査読

Shuhei Iwasaki, Ryoji Kitada, Akira Okada, Yasuhiro Okamoto

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

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Trans Tech Publications Ltd

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

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

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

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年

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

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年

Laser Micro-drilling of Multi-layered Arti cial Skin 査読

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

Proceedings of Lasers in Manufacturing Laser in Manufactring 2015 2015年

Smart Laser Micro-welding of Difficult-to-weld Materials for Electronic Industry 査読

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

Proceedings of Laser-based Micro- and Nano-Processing IX, Lasers and Application in Science and Engineering, Photonics West Conference 2015 9351 935102-1 - 935102-9 2015年

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

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年

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

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

Proceedings of 2nd International Manufacturing Engineering Conference 2015 2015年

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

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年

Fundamental Study on Curved Hole Drilling Method by EDM with Suspended Ball Electrode 査読

Atsushi YAMAGUCHI, Akira OKADA, Tatsuya MIYAKE, Toshiki IKESHIMA

Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, C25 4pages 2015.8 ( 0 ) _1104 - 1_ 2015年

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

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年

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

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年

Improvement of Surface Characteritics for Long Life of Metal Molds by Large-area EB Irradiation 査読

Akira Okada, Yasuhiro Okamoto, Yoshiyuki Uno, Kensuke Uemura

Journal of Material Processing Technology 214 ( 8 ) 1740 - 1748 2014年8月

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

Yasuhiro Okamoto, Tomohiro Takekuni and Akira Okada

Journal of Laser Micro/Nanoengineering 9 ( 1 ) 52 - 58 2014年3月

Fundamental Study on Releasability of Molded Rubber from Mold Tool Surface 査読

Akira Okada, Yasuhiro Okamoto, Adam Clare and Yoshiyuki Uno

International Journal of Advanced Manufacturing Technology 70 ( 5-8 ) 1515 - 1521 2014年2月

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

Hajime Yonehara, Akira Okada, Yasuhiro Okamoto

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

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

Yasuhiro Okamoto, Ryoji Kitada, Akira Okada, Yoshiyuki Uno

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

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査読

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年

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論文 - 岡田　晃