Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 3, Issue 6
Displaying 1-5 of 5 articles from this issue
  • Ryozo FUJIMOTO
    1970 Volume 3 Issue 6 Pages 1-9
    Published: March 31, 1970
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Recently, the most important task in electric discharge machining is to increase of the working speed.
    The multi-circuit system electric discharge machining is a method of using a number of discharge circuits and corresponding number of electrodes to the circuit in order to get the working speed.
    But it is very difficult to control an autmatic feeding device and work of the single through hole.
    In this case. these electrodes are insulated electrically from each other and they are mechanically combined into one body so as to be fed by an automatic feeding device.
    Then it was revealed that the circuit number effciency is η=0.8 by experimental result.
    From this study, expect that the most effectual application of the multi-circuit system is discharge grinding machine
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  • [in Japanese], [in Japanese]
    1970 Volume 3 Issue 6 Pages 10-21
    Published: March 31, 1970
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Removal efficiency and single discharge Crater shape
    Yoshitsugu MUKOYAMA
    1970 Volume 3 Issue 6 Pages 22-32
    Published: March 31, 1970
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The mechanism of electric discharge machining has been recognized that a thermal action and a dynamics action that accompanies it are mainly attributable to the phenomenon of electric discharge machining, but then has been no full explanation about the relation between the discharge energy and the removal energy.
    In this report, the calculation of the melting removal efficiency and vapourizing removal efficiency has been made on the assumption that the single discharge removal is caused only by the melting or vapourizing in condenser discharge. and the single discharge crater shape, crater upheavals and remaining zone of molten metal on the crater has been measured in relation to the results of such calculations
    From these findings it can be inferred that the removal quantity which is blow off after melting is more large quantity than the vapourizing one.
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  • [in Japanese], [in Japanese], [in Japanese]
    1970 Volume 3 Issue 6 Pages 33-40
    Published: March 31, 1970
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Nagao SAITO, Kazuhiko KOBAYASHI
    1970 Volume 3 Issue 6 Pages 41-52
    Published: March 31, 1970
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Recently electrical discharge machining (EDM) has been used in vary wide fields, since its machining characteristics have markedly improved owing to the adoption of semiconductor switching elements. On the other hand machining techniques have become to be conplicated and to require considerable skills. For this kind of reason the tendency to start to apply adaptive control to EDM increased rapidly and Ford Motor's Company tried it first in 1967 to 1968. Mr. Fred, L, King (1) reported about this matter in detail. We also started to study on the adaptive control system of ELM several years ago, and have established the new control method by which satisfactory results have been obtained.
    In this paper we first report about the EDM phenomena which were investigated experimentally for the study of the adaptive control, and next introduce the new control method.
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