巻号一覧
27 巻 (1993)
- 56 号 p. 1-
- 55 号 p. 1-
- 54 号 p. 1-
27 巻, 55 号
選択された号の論文の4件中1～4を表示しています
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片岡 義博, 宮崎 俊行, 増沢 隆久1993 年 27 巻 55 号 p. 1-9
発行日: 1993/07/31
公開日: 2010/03/12
ジャーナル フリーCO2 laser cutting and heat treatment technique are introduced for deburring spheroidal graphite cast iron. Thickness of heat affected zone (HAZ) generated in the deburring process was investigated as functions of cutting speed, laser power, assist-gas pressure and focusing position of the laser beam. The thickness decreased with decreasing cutting speed and laser power, and with increasing assist-gas pressure. The thinnest HAZ thickness obtained was 0.02mm, when the conditions were 25mm/min, 200W and 490kPa. After deburring, the HAZ was heat treated by CO2 laser beam. The martensitic structure (MHV 770-800) of the HAZ could be completely transformed into fine pearlite. The hardness after the treatment was MHV 380-420 when the laser power was 900W and the scanning speed was 500mm/min. The experimental results show that CO2 laser cutting and subsequent heat treatment are applicable to the deburring of spheroidal graphite cast iron.抄録全体を表示PDF形式でダウンロード (6093K) -
放電加工における加工液噴射効果の解析及びシミュレーション崔 小新, 増沢 隆久, 谷口 伸行1993 年 27 巻 55 号 p. 10-22
発行日: 1993/07/31
公開日: 2010/03/12
ジャーナル フリーIn the previous report, we developed a dynamic jet flushing method which is called “scan-flushing”. Experimental results clarified the effectiveness of this method on the precision of machining over conventional jet flushing method. Although good results of the scan-flushing were obtained, several parameters may influence the process. To help to optimize these parameters, a computational method to simulate the process is proposed in this paper. It was confirmed that this simulation algorithm can represent the distribution phenomenon of debris with good correlation with the unevenness of the workpiece surface produced.抄録全体を表示PDF形式でダウンロード (9379K) -
今井 祥人, 佐竹 彰, 種田 淳, 小林 和彦1993 年 27 巻 55 号 p. 23-30
発行日: 1993/07/31
公開日: 2010/03/12
ジャーナル フリーThe authors developed a high frequency response actuator which is used as an adaptor for a conventional electric discharge machine. With the adaptor, the effects of frequency response to machining stability and machining speed were examined. Experimental results show that machining speed was improved by roughly 1.5-2.5 for (1) the machining with fluid flushing on the finishing condition (10μmRmax) (2) the machining with jump action on the high-gloss finishing condition (1μmRmax) (3) the machining of the micro-hole (∅240μm). The machining speed for the machining with jump action on the finishing condition (10μmRmax), however, was not improved. The difference of the improvement in the machining speed is explained qualitatively by the difference of the behavior of debris in the machining gap.抄録全体を表示PDF形式でダウンロード (2320K) -
パルスデューティ比の影響土屋 政光, 金子 勉, 安部 泰浩1993 年 27 巻 55 号 p. 31-40
発行日: 1993/07/31
公開日: 2010/03/12
ジャーナル フリーThis study aims to represent the characteristics of the jump-flushing EDM by a simple mathematical model in order to realize suitable selections of jump parameters through computer simulations.
In the previous report, we proposed a basic model from a consideration of similarity between the increasing process of machining products in the working gap and the charging process of a capacitance in the DC electrical circuit. As a result, that model showed validities to represent a change in machining characteristics and jump parameters with progression of machining.
In the present report, we propose an expanded model in which influences of duty factor of working pulses are taken into consideration. Computer simulations based on the new model showed that suitable jump parameters and rest time of working pulse are able to be estimated. Further expansion of the model will be possible by considering influences of peak current or pulse duration in the similar way of the duty factor.抄録全体を表示PDF形式でダウンロード (2958K)
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