巻号一覧
29 巻 (1995)
- 62 号 p. 1-
- 61 号 p. 1-
- 60 号 p. 1-
29 巻, 60 号
選択された号の論文の3件中1～3を表示しています
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電極へのカーボン付着現象鈴木 政幸, 毛利 尚武, 恒川 好樹, 齋藤 長男1995 年 29 巻 60 号 p. 1-10
発行日: 1995/03/31
公開日: 2010/03/12
ジャーナル フリーIt has been known that the wear of copper electrode is very small in the machining of carbon steels. In this case, turbostratic carbon layer is generated on the electrode surface. We suggested in the former reports that the low wear of electrode was caused by the turbostratic carbon layer on the electrode surface. In this paper, the mechanism of the generation of the turbostratic carbon on the electrode surface is discussed through machining of work piece with several kinds of materials. It is revealed that the electrode wear depends on the amount of the turbostratic carbon on the electrode surface and that the turbostratic carbon is generated owing to the catalysis of the work piece materials such as iron (Fe), nickel (Ni) and chromium (Cr).抄録全体を表示PDF形式でダウンロード (2685K) -
福澤 康, 谷 貴幸, 岩根 英二, 毛利 尚武1995 年 29 巻 60 号 p. 11-21
発行日: 1995/03/31
公開日: 2010/03/12
ジャーナル フリーThere are much limitations for machining the ceramic materials which are known as the hard machinable material by mechanical procedures on the problems of the machined shapes and machining time and so on. However the electrical discharged machining (EDM) method is useful for machining the high hard material such as a hard metal, it had been impossible to machine almost of the ceramics except of the a few special methods, because of the insulated properties of their own.
As the purpose of this paper is to develop the new machining method for the insulating ceramics by normal conventional EDM machine, three types of procedure are proposed. Insulating ceramics could be machined by the proposed methods, so the machining procedures and characteristics were explained and the machining mechanism were discussed. of normal polarity discharge.
(4) The electrode wear and the surface finish in EDM with kerosine type fluid become larger with increasing the ratio of normal polarity discharge.抄録全体を表示PDF形式でダウンロード (9601K) -
宇野 義幸, 岡田 晃, 伊藤 満, 高木 俊1995 年 29 巻 60 号 p. 22-30
発行日: 1995/03/31
公開日: 2010/03/12
ジャーナル フリーMachining performance in the normal polarity EDM greatly differs from that in the reversed polarity one. The removal rate in the normal polarity EDM is high, though the electrode wear is large in EDM with graphite electrode. On the other hand, the removal rate in the reversed polarity EDM is relatively low, though the electrode wear is small, which leads to no electrode wear EDM under a proper machining condition. Therefore, it is considered that it might be more effective to mix both the normal polarity EDM and the reversed polarity one.
In this paper, the effect of polarity changing on the EDM performance with graphite electrode is experimentally investigated, using high speed polarity changing device in which the number and the polarity of discharge can be quickly changed at will, in order to attain higher removal rate and lower electrode wear. Main conclusions obtained are as follows:
(1) The removal rate takes a maximum when the reversed polarity discharge is a little mixed into the normal polarity EDM with kerosine type fluid. It is due to the removal of carbonized layer and/or heat resolved carbon of machining fluid from the workpiece surface.
(2) The removal rate, the electrode wear and the surface finish in EDM with kerosine type fluid depend on the ratio of normal polarity discharge to the reversed polarity one regardless of the number of each polarity discharge in a cycle.
(3) The removal rate in EDM with deionized water increases linearly with increasing the ratio of normal polarity discharge.
(4) The electrode wear and the surface finish in EDM with kerosine type fluid become larger with increasing the ratio of normal polarity discharge.抄録全体を表示PDF形式でダウンロード (4418K)
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