Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 21, Issue 41
Displaying 1-2 of 2 articles from this issue
  • Relations between Behavior of a Needle Electrode and Machining Characteristics
    Hachiro TSUCHIYA, Hidekazu GOTO, Makoto MIYAZAKI, Nobushige TAKADA, Ki ...
    1988 Volume 21 Issue 41 Pages 1-11
    Published: January 31, 1988
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    This paper deals with relations between the behavior of a needle electrode and machining characteristics in drilling with electro-chimical discharge. The behavior of a needle electrode was observed by using a detector consisting of an optical fiber and a phototransistor. As the machining characteristics, the profile and the volume of pit formed by electro-chemical discharge were measured. The results obtained are as follows:
    1) The needle electrode rises with the bubbles generated in the electrolytic reaction. The rising speed and the rising distance depend on the voltage across the electrode, but they are independent of the load applied on the needle electrode.
    2) The pit profiles change from ring- to cone-shape as the discharge time progresses. The pit volume is proportional to the discharge time, but is independent of the load applied on the needle electrode.
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  • Iwao KONDO, Hitoshi TOKURA, Takao NAKABAYASHI, Mineaki SUZUKI, Masanor ...
    1988 Volume 21 Issue 41 Pages 12-23
    Published: January 31, 1988
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    This paper is discribing chiefly the characteristic and performance of electro discharge grinding. Grindstone is vitrified bond diamond wheel (No. 140/170 GE RGV). Workpiece have used alumina, alumina sintering additive silicon nitride (ASN) and partial stabilized zirconia (ZrO2). Electrolyte contains 5 weight percentage caustic soda.
    A full wave rectifiered commercial alternative current (DC 80V, 120V) is supplied from generator. It is concluded from this experiment.
    1) It is certain that the light by generation in gap is an arc discharge light.
    2) The wear of ceramics by the combination of electrochemical machining and discharge machining is very little compared to grinding.
    3) One of the effect of discharge on this kind of grinding is a decreased electric driving power.
    We can say that decrease of driving power has been caused by automatic dressing of grindstone.
    4) At the small depth of cut of alumina, driving power is not decreased compare with non discharge grinding time.
    5) In both cases either discharge grinding or not, the sharpness of edge becomes blunt. To keep the sharpness of grindstone, traditional dressing must be used.
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