巻号一覧
10 巻 (1976 - 1977)
- 20 号 p. 1-
- 19 号 p. 1-
10 巻, 19 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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円筒深絞り加工について大森 正已, 井上 友一, 土屋 八郎1976 年 10 巻 19 号 p. 1-11
発行日: 1976/09/30
公開日: 2010/03/12
ジャーナル フリーPDF形式でダウンロード (3935K) -
増井 清徳, 谷村 毅1976 年 10 巻 19 号 p. 12-23
発行日: 1976/09/30
公開日: 2010/03/12
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重畳および追加パルスの影響元木 幹雄, 猪飼 健夫1976 年 10 巻 19 号 p. 24-31
発行日: 1976/09/30
公開日: 2010/03/12
ジャーナル フリーThe present paper deals with a research on the electrode erosion of the electric discharge machining (EDM), which is caused by repeating of the pulse discharge in a kerosene dielectric. The effect of pulse shape on electrode wear was investigated for understanding the physical aspect of EDM.
In the experiment, copper was used as the tool electrode E, hardned steel was used as the workpiece W and the tool electrode was always held to positive polarity. The electric circuitry of EDM is illustrated in Fig. 1, Which is composed of two different pulse generators.
As for pulse shape, positive pulses with short duration were superimposed on long square pulses in previous report. So, in this study, negative pulses with short duration are superimposed on long square pulses as shown in Fig. 2 (a) and Fig. 3. Then, short negative pulses are added in the intervals of long square pulses as shown in Fig. 2 (b) and Fig. 5, and also short positive pulses are added as shown in Fig. 2 (c) and Fig. 7. The phase τd of short pulse can be shifted at each pulse train.
In above mentioned pulse trains of three kind, the electrode wear rate Ma, the workpiece removal rate Mc and the relative electrode wear γ were measured against the phase τd of short pulse.
It became clear from Fig. 4, 6 and 8 that the erosion characteristics of electrodes are essentially influenced by both phase and polarity of short pulse. When phase of positive pulse with short duration reaches in front of long square pulse, the relative electrode wear is found to be remarkably reduced as given in Fig. 8.抄録全体を表示PDF形式でダウンロード (4244K) -
写真撮影による加工部の観察向山 芳世, 緒方 勲1976 年 10 巻 19 号 p. 32-42
発行日: 1976/09/30
公開日: 2010/03/12
ジャーナル フリーThe method of the electric discharge cutting by using an electrolytic working fluid is the most effective means for the cutting of the special metal. And recently, this method has become to be applied widely. But there are many unkown phenomena on this cutting mechanism.
So, in order to make clear this working mechanism, the condition of the production of electric discharge, the duration time of electric discharge, the product ion and expansion of gaseous vapor, the trajectory of debris and etc. are observed by making use of high-speed camera and are investigated.
It is clear from the above observation and discussion that the working mechanism is mainly caused by the contact and dissociation between an electrode and a work, and the use of working fluid shows a more effective in the practical discharge cutting process.抄録全体を表示PDF形式でダウンロード (5188K)
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