Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
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Volume 39, Issue 92
Displaying 1-5 of 5 articles from this issue
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Lecture
Paper
  • Study of 3D Surface Machined on Cemented Carbide by Dry EDM
    YU Zhanbo, Jun TAKAHASHI, Nobuhiro NAKAJIMA, Sadao SANO, Masanori KUNI ...
    2005 Volume 39 Issue 92 Pages 92_20-92_27
    Published: 2005
    Released on J-STAGE: June 09, 2006
    DOIhttps://doi.org/10.2526/jseme.39.92_20
    JOURNAL FREE ACCESS
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    In dry electric discharge machining of cemented carbide, short circuits frequently occur between work and tool electrodes, disrupting the process. In this study, to increase the efficiency of electric discharge frequency and increase work removal rate, we researched the effects of superposed voltage, ultrasonic vibration, high peak current, and mist supply. As a result, it was found that applying superposed voltage and ultrasonic vibration can increase work removal ratio. A long pulse and a low peak current are more appropriate than a short pulse and a high peak current for dry electric discharge. Moreover, by supplying mist into the working gas, the electric discharge process becomes more stable, the consumption of the electrode is lower, and a larger work removal ratio can be expected.
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  • Development of Coating Wire Electrode for High Performance WEDM (1st Report)
    —Fundamental WEDM Characteristics of Coating Wire—
    Toshiyuki YAMAUCHI, Akira OKADA, Masato MORITA, Toshiaki SHIMIZU, Yosh ...
    2005 Volume 39 Issue 92 Pages 92_28-92_35
    Published: 2005
    Released on J-STAGE: June 09, 2006
    DOIhttps://doi.org/10.2526/jseme.39.92_28
    JOURNAL FREE ACCESS
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    In this study, we aim to develop a new coating wire electrode for a high-performance wire EDM instead of conventional wires. The effects of coating materials on the fundamental machining characteristics are investigated to obtain the optimum structure, using a high-tensile steel wire coated with brass and zinc whose diameter is 200μm. The experimental results showed that the removal rate increased with the thickness of the coated brass on the steel wire in WEDM with the brass and zinc coated steel wire. The SEM observation and the element analysis of wires after machining clearly showed that the coated brass layer was easily removed when the thickness was small, and a high tension could be loaded during machining when the thickness of the coated brass was sufficiently large to maintain a stable machining performance. Furthermore, the effect of zinc coating on the removal rate was marked when the thickness of the coated brass was relatively small.
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  • Study of electrical discharge machining of titanium
    Haruki OBARA, Tetsuji YATSUNAMI, Masatoshi HATANO
    2005 Volume 39 Issue 92 Pages 92_36-92_41
    Published: 2005
    Released on J-STAGE: June 09, 2006
    DOIhttps://doi.org/10.2526/jseme.39.92_36
    JOURNAL FREE ACCESS
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    Titanium is frequently used in medical instruments. Medical instruments have complicated shapes and it is desirable to machine them by electrical discharge machining. However usually the EDM (except WEDM) of titanium is not stable, and medical instruments should not be contaminated by the tool electrode material during EDM. In this paper, we describe EDM test results of titanium in dielectrics of oil and water using a tool electrode of copper and titanium. A titanium tool electrode is used to avoid contamination of the titanium workpiece. Test results show that the EDM of titanium using the copper tool electrode in the water is more stable than in the oil, and has a low electrode wear ratio. Analyzed results on the copper tool electrode surface show that the reason for the low electrode wear ratio of the copper electrode in water is the adhesion of titanium transferred from the workpiece. The EDM of titanium using the titanium tool electrode in water has a 10% electrode wear ratio and is possible to use in machining of medical instruments.
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Technical Report
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