Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 38, Issue 88
Displaying 1-5 of 5 articles from this issue
  • Scanner Welding and Rapid Prototyping
    Teruyoshi KADOYA
    2004 Volume 38 Issue 88 Pages 8-12
    Published: July 30, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Application of Surface Modification of electric discharge machining for complicated shapes
    Masaaki SANO, Koji YATSUSHIRO, Katsuzo OKADA
    2004 Volume 38 Issue 88 Pages 13-20
    Published: July 30, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The purpose of this report is to produce, a high-quality surface by electric discharge machining. In the previous paper, we confirmed the formation of a hardened layer upon mixing Ti powder into the working fluid. However surface roughness increased on the treated surface. In this experiment, we tried to apply this treatment to a die with a complicated shape. Some characteristics of the layer modified by electric discharge machining were evaluated by surface roughness measurement, X-ray diffraction analysis and SEM observation. The following results of the experiment were obtained. 1) Although surface roughness was improved by finishing electric discharge machining after surface modification, the hardness decreased only slightly on the surface. 2) A modified layer could be generated on the complicated shape. When applying scanning EDM, it was evident that a modified layer formed on the surface. 3) The gap distance increased when Ti powder was mixed into the working fluid. 4) When these surface modifications were applied to the metal stamping die for a jewel, a uniform modified layer was forming on the whole worked surface.
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  • Simulation of Floating Debris Using Small Steel Balls
    Hachiro TSUCHIYA, Hidekazu GOTO, Makoto MIYAZAKI, Kai EGASHIRA, Koji S ...
    2004 Volume 38 Issue 88 Pages 21-26
    Published: July 30, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Electrical discharge phenomena in fluids have been observed using suspended small steel balls placed between electrodes, in order to investigate the effect of debris not attached to tool electrodes or a workpiece on the generation of discharge in electrodischarge machining (EDM). Discharge occurs at certain voltages only when a ball is inserted between electrodes. Images taken using a high-speed camera show that, with one ball, the first dielectric breakdown takes place between one electrode and the ball, followed by the second breakdown between the other electrode and the ball, before spark discharge begins between the electrodes. With two balls, the breakdowns between an electrode and a ball precede that between the balls. These results suggest that the presence of suspended debris facilitates the generation of discharge in EDM and that the discharge between electrodes occurs after breakdowns take place between an electrode and debris, between a workpiece and debris, and among debris. Electrical fields are calculated by the finite element method, indicating that the first breakdown occurs at the gap with the highest electrical field.
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  • Electric Discharge Circuits for Electric Discharge Machining
    Haruki OBARA
    2004 Volume 38 Issue 88 Pages 29-35
    Published: July 30, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Michikazu UCHIDA, Hideto TANAKA, Seiki KAWAI
    2004 Volume 38 Issue 88 Pages 36-38
    Published: July 30, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Download PDF (5063K)
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