Faculty Profiles - OKADA Akira

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Computational Fluid Dynamics Analysis of Fluid Flow in Wire EDM (5th Report):Effect of workpiece thickness machined kerf length

Fujimoto Takuya, Okada Akira, Okamoto Yasuhiro, Uno Yoshiyuki

Proceedings of JSPE Semestrial Meeting 2011 The Japan Society for Precision Engineering

Event date： 2011

In wire EDM, better exclusion of debris and bubbles from the working gap is important to keep stable electrical discharges and high-performance wire EDM. However, the flow field of working fluid in the gap has not yet been made clear sufficiently. The purpose of this study is to clarify the fluid flow and to recommend better jet flushing conditions of working fluid from the nozzles by CFD. In this report, the effects of workpiece thickness and machined kerf length on the flow in the kerf and the frequency of wire breakage are investigated.

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ワイヤ放電加工面の成型樹脂との離型性に関する研究

日置裕彦,北田良二,岡田晃,宇野義幸

電気加工学会全国大会2010 電気加工学会

微細ワイヤ放電加工における放電分散状態に関する研究

中澤正典,岡田晃,山内俊之,宇野義幸

電気加工学会全国大会2010 電気加工学会

Study on Releasability of Molded Resin from Wire EDMed Surface

HIOKI Hirohiko, OKADA Akira, UNO Yoshiyuki, ZHOU Zhiquan, KITADA Ryoji

2010.11.25

Study on Spark Location Distribution in Fine Wire EDM

NAKAZAWA Masanori, OKADA Akira, UNO Yoshiyuki, YAMAUCHI Toshiyuki

2010.11.25

A14 EDM Characteristics of Carbon Fiber Reinforced Plastics

WANG Hai, OKADA Akira, UNO Yoshiyuki

The ... Manufacturing & Machine Tool Conference 2010.11.19 The Japan Society of Mechanical Engineers

Event date： 2010.11.19

Language：Japanese

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

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A17 Surface Modification of Cemented Carbide by EB Polishing

GUO Hongge, KITADA Ryoji, OKADA Akira, UNO Yoshiyuki

The ... Manufacturing & Machine Tool Conference 2010.11.19 The Japan Society of Mechanical Engineers

Event date： 2010.11.19

Language：Japanese

Cemented carbide has many excellent properties, such as high strength, high hardness and so on. However, it is difficult to apply conventional surface finishing or surface modification methods for the cemented carbide. In this study, a new surface modification method by large-area electron beam irradiation (EB polishing) was proposed. The surface structure of the EB polished cemented carbide was observed by TEM. Then the surface characteristics, such as hardness, water repellency and releasability of molded resin were evaluated. The experimental results clarified that the water repellency and the releasability of the molded resin could be improved because the surface structure changed by EB polishing.

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炭素繊維強化プラスチックの放電加工に関する研究

王海,岡田晃,宇野義幸

日本機械学会第8 回生産加工・工作機械部門講演会日本機械学会

EBポリッシングによる超硬合金の表面改質

郭洪閣,北田良二,岡田晃,宇野義幸

日本機械学会第8 回生産加工・工作機械部門講演会日本機械学会

Si 粉末混入放電加工加工面の離型性に関する基礎的研究

周志全,北田良二,日置裕彦,岡田晃,宇野義幸

2010 年度精密工学会徳島地方学術講演会精密工学会

CFRP の放電加工におけるファイバ方向が加工特性に及ぼす影響

市井翔,王海,岡田晃,宇野義幸

2010 年度精密工学会徳島地方学術講演会精密工学会

大面積電子ビーム表面仕上げにおけるセラミックス・超硬合金の表面温度解析

藤田智弘,岡田晃,宇野義幸

2010 年度精密工学会徳島地方学術講演会精密工学会

ワイヤ放電加工における加工液流れのCFD 解析（第4 報）

藤本卓也,岡田晃,宇野義幸

2010 年度精密工学会秋季大会学術講演会精密工学会

プラズマ窒化処理がステンレス鋼の表面性状に及ぼす影響

玉置司, 植村賢介, 岡田晃,宇野義幸

2010 年度精密工学会秋季大会学術講演会精密工学会

成形ゴムと金型表面の離型性に及ぼすEBポリッシングの効果

岡田晃,梅地孝志,宇野義幸

日本機械学会2010 年度年次大会日本機械学会

放電加工の高性能化に関する研究

宇野義幸,岡田晃,岡本康寛

ABTEC2010 度砥粒加工学会学術講演会砥粒加工学会

大面積電子ビーム照射による表面処理技術

宇野義幸,岡田晃,岡本康寛

ABTEC2010 度砥粒加工学会学術講演会砥粒加工学会

レーザ微細加工技術

宇野義幸,岡田晃,岡本康寛

ABTEC2010 度砥粒加工学会学術講演会砥粒加工学会

成形樹脂の離型性向上に有効な放電加工面性状

北田良二,日置裕彦,周志全,岡田晃,宇野義幸

ABTEC2010 度砥粒加工学会学術講演会砥粒加工学会

高速度観察によるワイヤ放電加工の放電分散評価

中澤正典,岡田晃,宇野義幸,山内俊之

型技術者会議2010 型技術協会

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