研究者詳細 - 岡田　晃

論文 - 岡田　晃

分割表示 396 件中 181 - 200 件目／全件表示 >>

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

Motoki Ota, Yasuhiro Okamoto, Togo Shinonaga, Akira Okada

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

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

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年

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

Togo Shinonaga, Shono Kinoshita, Yasuhiro Okamoto, Akira Okada

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

High-speed Observation of Thin Wire Movement in Fine Wire EDM 査読

Takuya Kamei, Akira Okada, Yasuhiro Okamoto

Procedia CIRP 42 ( 42 ) 596 - 600 2016年

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

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年

Investigation of Nanocrystalline Diamond Coating on Cutting Tools for CFRP 査読

Alexander SOLDATOV, Akira OKADA, Kensuke UEMURA

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

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

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年

Formation of Periodic Nanostructures with Femtosecond Laser for Creation of New Functional Biomaterials 査読

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

Procedia CIRP 42 ( 42 ) 57 - 61 2016年

Improvement in Surface Characteristics by EDM with Chromium Powder Mixed Fluid 査読

Ryota Toshimitsu, Akira Okada, Ryoji Kitada and Yasuhiro Okamoto

Procedia CIRP 42 ( 42 ) 231 - 235 2016年

Influence of Pulse Duration on Processing Characteristics of Transparent Conductive Film Containing Silver Nanowires by ns Pulsed Fiber Laser 査読

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

Procedia CIRP 42 ( 42 ) 62 - 66 2016年

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

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

Procedia CIRP 42 ( 42 ) 448 - 453 2016年

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

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年

Effect of Surrounding Gas Condition on Surface Integrity in Microdrilling of SiC by ns Pulsed Laser 査読

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

Applied Physics B Laser and Optics 119 ( 3 ) 509 - 517 2015年6月

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

Yasuhiro Okamoto, Satoshi Matsuoka, Tadanori Otowa and Akira Okada

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

Effect of Tilting Jet Flushing Nozzle on Wire EDM Performance 査読

Takuro Konishi, Akira Okada, Yasuhiro Okamoto, Haruya Kurihara

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

Experimental investigation on wire vibration during fine wire electrical discharge machining process 査読

Sameh Habib, Akira Okada

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

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) 査読

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年

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-小径曲がり穴加工のための電極球質量および直径の検討- 査読

山口篤, 岡田晃, 三宅達也, 池嶋俊貴

精密工学会誌 81 ( 11 ) 1039 - 1044 2015年

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

Tomoaki Miyoshi, Akira Okada, Yasuhiro Okamoto

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

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

DOI： 10.4028/www.scientific.net/KEM.656-657.369

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

Akira Okada, Takuya Konishi, Yasuhiro Okamoto, Haruki Kurihara

CIRP Annals - Manufacturing Technology 64 ( 1 ) 233 - 236 2015年

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