Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 10, Issue 19
Displaying 1-4 of 4 articles from this issue
  • [in Japanese], [in Japanese], [in Japanese]
    1976 Volume 10 Issue 19 Pages 1-11
    Published: September 30, 1976
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese]
    1976 Volume 10 Issue 19 Pages 12-23
    Published: September 30, 1976
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Effect of Superimposed and Added Pulse on Electrode Erosion
    Mikio MOTOKI, Takeo IKAI
    1976 Volume 10 Issue 19 Pages 24-31
    Published: September 30, 1976
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The present paper deals with a research on the electrode erosion of the electric discharge machining (EDM), which is caused by repeating of the pulse discharge in a kerosene dielectric. The effect of pulse shape on electrode wear was investigated for understanding the physical aspect of EDM.
    In the experiment, copper was used as the tool electrode E, hardned steel was used as the workpiece W and the tool electrode was always held to positive polarity. The electric circuitry of EDM is illustrated in Fig. 1, Which is composed of two different pulse generators.
    As for pulse shape, positive pulses with short duration were superimposed on long square pulses in previous report. So, in this study, negative pulses with short duration are superimposed on long square pulses as shown in Fig. 2 (a) and Fig. 3. Then, short negative pulses are added in the intervals of long square pulses as shown in Fig. 2 (b) and Fig. 5, and also short positive pulses are added as shown in Fig. 2 (c) and Fig. 7. The phase τd of short pulse can be shifted at each pulse train.
    In above mentioned pulse trains of three kind, the electrode wear rate Ma, the workpiece removal rate Mc and the relative electrode wear γ were measured against the phase τd of short pulse.
    It became clear from Fig. 4, 6 and 8 that the erosion characteristics of electrodes are essentially influenced by both phase and polarity of short pulse. When phase of positive pulse with short duration reaches in front of long square pulse, the relative electrode wear is found to be remarkably reduced as given in Fig. 8.
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  • Observation of Working Portion by Making Use of High-Speed Camera
    Yoshitsugu MUKOYAMA, Isao OGATA
    1976 Volume 10 Issue 19 Pages 32-42
    Published: September 30, 1976
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The method of the electric discharge cutting by using an electrolytic working fluid is the most effective means for the cutting of the special metal. And recently, this method has become to be applied widely. But there are many unkown phenomena on this cutting mechanism.
    So, in order to make clear this working mechanism, the condition of the production of electric discharge, the duration time of electric discharge, the product ion and expansion of gaseous vapor, the trajectory of debris and etc. are observed by making use of high-speed camera and are investigated.
    It is clear from the above observation and discussion that the working mechanism is mainly caused by the contact and dissociation between an electrode and a work, and the use of working fluid shows a more effective in the practical discharge cutting process.
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