Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 52, Issue 129
Displaying 1-1 of 1 articles from this issue
Paper
  • Takayuki TANI, Yoshiki TSUJITA, Hiromitsu GOTOH, Naotake MOHRI
    Article type: Paper
    2018 Volume 52 Issue 129 Pages 31-37
    Published: 2018
    Released on J-STAGE: March 22, 2019
    JOURNAL FREE ACCESS
     Although electrical discharge machining (EDM) can be used to perform high-precision machining, the material removal rate is low. From this viewpoint, it is extremely important to understand the process by which material is removed in the EDM method. In this study, the state of a workpiece being processed by a single pulse discharge was observed using a high-speed camera equipped with a high-magnification lens. To enable easy observation of the behavior of the material, a machining condition was selected in which there was a long duration of the pulse discharged by the needle electrode in air. Using a laser beam as illumination, an observation system employing a bandpass filter that allowed only a specific wavelength to pass through it was constructed. As a result, the behavior of the workpiece during the discharge could be observed without the effect of plasma emission. It was observed that several explosions intermittently occurred on the positive side of the workpiece during a single pulse discharge duration. Consequently, several small craters superposed in a narrow region were observed.
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