Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 22, Issue 44
Displaying 1-3 of 3 articles from this issue
  • [in Japanese], [in Japanese]
    1989 Volume 22 Issue 44 Pages 1-9
    Published: March 20, 1989
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • 1st Report; Analysis of Water Flow in Cut Groove
    Haruki OBARA
    1989 Volume 22 Issue 44 Pages 10-22
    Published: March 20, 1989
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Maximum cutting speeds of Wire EDM are limited by the break down of wire. During machining of the Wire EDM, the wire is heated by discharges but cooled by the flow of machining fluid, normally water. Abnormal overheating of the wire causes low tensile strength of the wire, and wire break down. So that wire cooling by the water flow has great effects on maximum cutting speed of wire EDM.
    In this 1st report, the water flow in cut grooves by wire EDM are analysed using comformal mapping. Results shows that the flow rates of water at the nozzle are proportional to a aquare root of pump outlet pressure and the flow rate in the cut groove decreases so quickly if workpiece thickness increases. Larger inner nozzle size or larger outer nozzle size causes higher flow rate in the cut groove.
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  • Jiro MATSUDA, Sadami TOMISHIGE, Ken-ichi TANAKA, Hiroshi YANO
    1989 Volume 22 Issue 44 Pages 23-35
    Published: March 20, 1989
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The optimum machining conditions of a WEDM are estimated by the parameter design on the basis of Taguchi's method, and the performance evaluation is carried out.
    When a dimension is adopted as a characteristic, it is estimated that, by optimizing the average machining voltage and wire speed, the improvement of the accuracy is expected by about 50%, and under the optimum machining conditions machining is done with precision of about 21μm (σ).
    Other results concerning angle show that by optimizing the discharge currents for machining and quiescent time, the improvement of the accuracy is expected by 40%, and similarly under the optimum machining conditions, machining can be done with precision of about 8s (σ).
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