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 35, Issue 80
Displaying 1-5 of 5 articles from this issue
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  • An overview of micro-EDM
    Takahisa Masuzawa
    2001 Volume 35 Issue 80 Pages 5-20
    Published: November 30, 2001
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.35.80_5
    JOURNAL FREE ACCESS
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    In this paper, the contemporary technology of micro-EDM is overviewed. The basic technological background of micro-EDM is discussed first. Following some introduction of the types of equipment, present state of the technology and examples of machining are shown. Various possible combinations with other micromachining technologies are also discussed.
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  • Continuously machining microholes by EDM
    Development of Tandem Micro-EDM System
    Dong-Yea SHEU, Takahisa MASUZAWA, Masatoshi FUJINO
    2001 Volume 35 Issue 80 Pages 21-29
    Published: November 30, 2001
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.35.80_21
    JOURNAL FREE ACCESS
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    Machining microholes has become important in various industrial fields. Since the development of WEDG (wire electro discharge) technology, micro-EDM has become an excellent method for machining microholes on metals and alloys. However, problems remain for achieving mass production of microholes by EDM. Conventional micro-EDM technology is needed to prepare a microtool before machining microholes. In this paper a new system is proposed for machining microholes, called the Tandem micro-EDM system. The new system is not only for machining microtools but also for machining microholes at the same time. As a result, the Tandem micro-EDM system can machine a great number of microholes continuously after spindle setup.
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  • Coloring of Titanium Alloy by EDM (2nd Report)
    Analysis of Coloring Mechanism
    Hisashi MINAMI, Kiyonori MASUI, Hidekazu TSUKAHARA, Hideki HAGINO
    2001 Volume 35 Issue 80 Pages 30-35
    Published: November 30, 2001
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.35.80_30
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    In the previous report, we proposed a new coloring method for titanium alloy by Electrical Discharge Machining (EDM) in dielectric water and discussed the coloring mechanism for titanium alloy. The colored surface could be caused by an interference phenomenon in the anodic oxide film formed with electrolytic affection during EDM. In this study, further investigation of the coloring mechanism on the EDM surface was carried out by calculating the spectral reflectance of interference light based on the “multiple beam interference” theory. As a result, it was shown that the color of the EDM surface strongly resembled the interference color of spectral reflectance. It was therefore confirmed that the surface coloring by EDM was caused by an interference phenomenon in the anodic oxide film. Moreover, the oxide film thickness depended on the average working voltage.
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  • Surface Modification Using Electrode Transfer Induced by Discharge of Gas
    Toshitaka SATSUTA, Kiyohito HIRAI
    2001 Volume 35 Issue 80 Pages 36-43
    Published: November 30, 2001
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.35.80_36
    JOURNAL FREE ACCESS
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    A pulsed arc has been applied to deposit an electrode material on a metallic substrate. Die steels are sparked with electrodes of cermets containing both borides (TiB2, ZrB2) and metals (Co, Ni) in argon atmosphere. A conventional NC EDM machine is used as a pulsed arc generator. A transistor-controlled capacitor circuit is adopted to obtain steep and high current electrical pulses promoting transfer of the electrode materials. Coatings of borides, which are difficult to build up, are deposited onto the substrates. Surfaces of the coatings are irregular and thickness varies in the range of 10 to 50μm. No cracks are observed in interfaces between the coatings and the substrates. Vickers hardness value (0.098N load) changes between 1, 000 to 3, 200Hv depending on both thickness of the coating and the electrode materials. Wear-out test is performed to investigate wear resistance of the coatings. Although the substrates without a coating are severely worn, the wear impression of the coated substrates is terminated in the coatings. An electrode mass transfer mechanism is observed. The electrode material is not transferred by a single discharge but by a highly concentrated discharge that occurs occasionally at arbitrary locations.
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  • Application of Gator Gard and Metbond to Turbomachinery Parts
    Yoshihito TONOMURA
    2001 Volume 35 Issue 80 Pages 44-48
    Published: November 30, 2001
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.35.80_44
    JOURNAL FREE ACCESS
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