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 14, Issue 27
Displaying 1-5 of 5 articles from this issue
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1980 Volume 14 Issue 27 Pages 1-15
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.14.1
    JOURNAL FREE ACCESS
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  • study on wire-EDM (3rd Report)
    Behavious of wire electrode and Machinability of electrodischarge
    Masahiko FUKUI, Natuo KINOSHITA, Takashi SHINMYO
    1980 Volume 14 Issue 27 Pages 16-29
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.14.16
    JOURNAL FREE ACCESS
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    It is important to analyse the behavious of the wire electrode in the gap of wire-EDM. There are some papers dealing with the existence of the incurvation of the wire and that of the wirelag behind the position given by the numerical control. But in these papers problems were analysed only by statical view point.
    For improving the performance of wire-EDM, the dynamic behavious of the wire in the working gap should be discussed. Considering the mechanical configuration of wire-winding system, the dynamic behaviour of the wire was studied here by the observation of the gap with and by the Fourier analysis of the polarized voltage process of the working gap.
    It was found out that the wire-vibration between the working gap took various modes according to the working condition, and it was posited out that the vibratio of the modes was very sensitive to both the thickness of the workpiece and the work feed rate.
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  • Effect of Carbon Content and Microstructures on the Current Efficiency of Electrochemically machined Fe-C Alloys
    Hideharu FUKUNAGA, Masuteru MARUYAMA
    1980 Volume 14 Issue 27 Pages 30-40
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.14.30
    JOURNAL FREE ACCESS
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    The present work was carried out in order to investigate systematically the effect of the carbon content and microstructure on the current efficiency and surface roughness of the steel during the electrochemical machining.
    The annealed sample had two contrasting characteristics distinguished by being hypereutectoid or hypoeutectoid constitution, and the quenched sample showed a quite different feature from them. One group of the annealed samples consisting of ferrite and pearlite structure has a high current efficiency more than 100% and a rough surface finish. The current efficiency and surface roughness increases with carbon content. Another group of annealed samples consisting of networked cementite and pearlite structure has a poor efficiency abut 60 to 75% and also a rough surface finish. On the other hand, every quenched sample, which consists of homogeneous martensite phase, has almost the theoretical current efficiency and a good surface finish. When quenching condition changed so as to give the networked cementite and the martensite together, the quenched sample showed the poor current efficiency. Further investigation by EPMA into machined surfaces proved that these characteristics were attributed to the appearance of networked cementite, to the increase in the carbide phase and to the carbon state in the iron phase.
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  • Cutting Ability of Electrode-Wheels Used in Electrochemical Grinding
    Mamoru KUBOTA, Yuji TAMURA, Masuo INOUE
    1980 Volume 14 Issue 27 Pages 41-49
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.14.41
    JOURNAL FREE ACCESS
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    In the peripheral electrochemical grinding low repeatability of over cut causes low accuracy of working. Using an electrode-wheel of mechanical cutting ability and finishing without current make it possible to get higher accuracy.
    In this standpoint working abilities of several electrode-wheels are investigated. Mechanical cutting ability is evaluated by the ratio of a tangential component and normal one of a grinding force measured by a dynamometer.
    In conclusion metal bond diamond wheel is suitable for the electrochemical grinding of the cemented carbide and CBN wheel is best for the high speed steel. Chemically nickel plated vitrified wheel is formable by a diamond tool and has sufficient cutting ability. Copper containing vitrified wheel has similar characteristics with the nickel plated wheel.
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  • [title in Japanese]
    [in Japanese]
    1980 Volume 14 Issue 27 Pages 50-57
    Published: 1980
    Released on J-STAGE: March 12, 2010
    DOIhttps://doi.org/10.2526/jseme.14.50
    JOURNAL FREE ACCESS
    Download PDF (630K)
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