Journal of The Japan Society of Electrical Machining Engineers

A Basic Study on Electrical Discharge Machining

Effect of the Pointed End Shape of an Electrode on Machining Characteristics

Hachiro TSUCHIYA, Hidekazu GOTO, Makoto MIYAZAKI

1988 Volume 22 Issue 43 Pages 1-6
Published: November 20, 1988
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.22.1

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This paper deals with the machining characteristics in impulse discharge as a basic study on electrical discharge machining, Using model electrodes with various pointed end shapes, the gap voltage, discharge current, discharge energy, and the shape and volume of the discharged crater are measured. On the basis of these measured results, the effect of the pointed end shape of electrode on machining characteristics is discussed. The results obtained are as follows:
1) The gap voltage is not constant during discharge but varies depending on the pointed end shape of the electrode.
2) As the sharpness of the pointed end of the electrode increases, the diameter and the depth of the discharged crater become larger and deeper, and the volume of the discharged crater becomes larger.

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A study on working mechanism of the Electrolytic-Abrasive combined machining

Investigation of combined machining by Titanium

Hiroshi KAMADA, Yasuo KIMOTO, Hirokazu KAWAI, Yoshiaki KAKINO

1988 Volume 22 Issue 43 Pages 7-17
Published: November 20, 1988
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.22.7

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Titanium has the properties of hard metal such as stainless steel and light metal such as aluminium. But it is difficult to get the mirror surface with high shape accuracy, because that the thermal conductivity of titanium is inferior to other metals. Especially, it is impossible to get wide-area mirror surface by using the ordinary working method such as cutting or grinding.
The authors succeed to get the mirror surface by means of the electrolytic-abrasive combined machining. In this paper, the authors describe both of the electrolytic and working characteristics in aqueous solution of NaNO₃ or NaCl and analytical experiments of combined working mechanism.

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Finishing of EDM Products by ECM Using a Mate-Electrode

Shigenori SAKAI, Takahisa MASUZAWA, Shin ITOU

1988 Volume 22 Issue 43 Pages 18-28
Published: November 20, 1988
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.22.18

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As reported before, WEDM products can be quickly finished until mirror-like by ECM using the remainder part of the products as the electrode. This report concerns with the extended application of that method to the products of EDM sinking. Since it is often difficult to realize a uniform flow of the electrolyte in this applications, the system was designed as; 1) The electrochemical process takes place in a still electrolyte. 2) The flushing is achieved by the periodical lift-up of the electrode and the synchronized spray of the electrolyte.
The experimental results show the effectiveness of this method in the production of cavities including forging dies, injection moulds etc.

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