Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 18, Issue 36
Displaying 1-3 of 3 articles from this issue
  • Research on Contour Machining of Inclined Plane and Cylindrical Surface
    Tsuotmu KANEKO, Masamitsu TSUCHIYA
    1985 Volume 18 Issue 36 Pages 1-16
    Published: March 31, 1985
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Valid machining programs for three-dimensionally controlled EDM with a cylindrical electrode have been investigated in order to perform efficiently accurate contour machining.
    Wear length in the radial direction of the electrode was automatically measured and fed back to determine the optimum distance between the worn electrode and the objective contour surface.
    Inclined planes with various angles as well as cylindrical surface were successfully obtained with improved accuracy using the technique described above.
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  • Influence of fluid on performance
    Kazuo MUTO, Yasuhito SHIOTA
    1985 Volume 18 Issue 36 Pages 17-29
    Published: March 31, 1985
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    In order to guarantee high accuracy in wire EDM, it is important to keep fluid in the constant conditions, such as temperature and fluid specific resistance. Because a wire EDM machine is automatically driven for a very long time, especially the accuracy of machined work can't be proof.
    Then, this paper describes the influence of fluid on performance in wire EDM. First of all each thermal source getting up fluid temperature in wire EDM is discussed. So a thermal control system of fluid is developed in this research. And also several experiments are taken place with the value of specific resistance changing.
    As a result of the experiments, it is noted that temperature and specific resistance of fluidshould be adaptively controlled to catch the high machining accuracy and good surface roughness. And it is found as follows. Selecting the optimum value of temperature, the average discharge current increases. Therefore the maxmum removal rate can be obtained.
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  • On the Fatigue Strength of Carbon Steel
    Tadao TSUTSUI, Takeo TAMURA
    1985 Volume 18 Issue 36 Pages 30-41
    Published: March 31, 1985
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The electro-discharge machining technique (EDM) is now widely used in various diemaking.
    However, the surface which yields to thermally induced micro-cracks and white layer damage may have a detrimental effect on the die life. In this study, the fatigue behaviour of electrosparked materials has been examined experimentally under various conditions in order to evaluate the effect of the spark-eroded surface on material strength. The results are as follows:
    (1) A reduction in the fatigue limit by EDM occurs both in normalized and hardened materials, which is particularly remarkable in the latter.
    (2) It is clarified that the rupture of the spark-eroded material depends on the discharge cracks, white layer and deep micro-crater.
    (3) For improving the fatigue strength of the spark-eroded surface, a satisfactory improvement can be attained by removing the thickness of the heat-affected zone. Moreover, the jet machining is successful for its purpose.
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