巻号一覧
13 巻 (1979 - 1980)
- 26 号 p. 3-
- 25 号 p. 1-
13 巻, 26 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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菅沼 栄一1980 年 13 巻 26 号 p. 3-20
発行日: 1980/03/31
公開日: 2010/03/12
ジャーナル フリーA potentiostatic transient study was made on the passivation of tungesten carbide alloy in NaNO3 solution. The initial stage of the passivation process was discussed in terms of the current-time relation. The oxides formed were stripped from the specimen surface with constant current stripping pulse. The amount of charge associated with oxide layer was determined as a function of the working parameters such as current density, electrode potential and machining time.抄録全体を表示PDF形式でダウンロード (8383K) -
筒井 忠夫, 田村 武夫, 富田 武憲1980 年 13 巻 26 号 p. 21-29
発行日: 1980/03/31
公開日: 2010/03/12
ジャーナル フリーBy a rotary electrode, WC-Co cemented carbide i s machined under low voltage (not exceeding 100 volts) and the machinability is compared by using the dielectric liquid such as kerosene or service city water. The results are as follows:
(1) The maximum value of the discharge current in water is lower than the one in kerosene under the same electrical condition.
(2) In water the electrode wear rate is lower and also the stock removal rate becomes larger than in kerosene when the source voltage increases or the charging resistance decreases.
(3) The electrolytic action is recognized in water (specific resistance: 103-104Ωcm) and it influences both the removal rate and the machining accuracy.
(4) In water the surface roughness is smaller and then the machining accuracy becomes lower than in kerosene. When using the isolated electrode in water, the accuracy is remarkably improved.抄録全体を表示PDF形式でダウンロード (3380K) -
エネルギー供給時間・放電電流ピーク値と応力分布の関係向山 芳世, 緒方 勲, 日原 政彦1980 年 13 巻 26 号 p. 30-41
発行日: 1980/03/31
公開日: 2010/03/12
ジャーナル フリーIn the electric discharge machining, the stress that generates on surface of the electrodes (workpiece and tool electrode) causes to produce cracks, and directly affects on the quality of the working objects (workpieces) after the machining as a residual stress, Previously, the theoretical analysis by means of the Monte Carlo method about stress distribution in the electric discharge machining had been reported by the same writers, but further it is very important matters to measure the stress distribution practically in various working conditions. Accordingly, the stress that generates on surface of the workpiece is measured by the method for X ray measuring, and this paper mainly deals with the relationship energy supplying duration, peak discharge current and stress distribution in rectangular energy supplying form about impulse discharged crater.抄録全体を表示PDF形式でダウンロード (1013K) -
電解液中の短間げきパルス放電現象久保田 護, 田村 祐二, 高橋 弘行, 菅谷 登美男1980 年 13 巻 26 号 p. 42-56
発行日: 1980/03/31
公開日: 2010/03/12
ジャーナル フリーSingle pulse discharge phenomena in the electrode gap smaller than 0.1mm filled with NaCl or NaNO3 solution are studied to make clear the working mechanism of electro-chemical discharge machining (ECDM). Gap voltage and current in discharge process and marks remained on the anode surface are investigated. Besides, ECDM with a square wave pulse generator is tried to obtain the optimum pulse width in this process.
Discharge in electrolyte between carbon rod cathode and steel plate anode gets a type of either spark or arc. Fine spark discharge occurrs through gas bubbles between electrode and electrolyte, and it has no effect of metal removal. Developed arc discharge takes place between two electrodes and makes crater on the work surface.
The influences of electrolyte, electrode gap, applied voltage and pulse width to the discharge in electrolyte are discussed in view of ignition delay. It is remarkable that discharge occurrs more easily in the electrolyte of higher concentration. Working voltage wave form in ECDM with a square wave pulse generator is similar to that of the single pulse discharge. Metal removal rate of it shows maximum when the pulse width is about 10-15ms.抄録全体を表示PDF形式でダウンロード (17362K)
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