Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 10, Issue 20
Displaying 1-2 of 2 articles from this issue
  • Mikio MOTOKI, Ken YUKIMURA
    1977 Volume 10 Issue 20 Pages 1-8
    Published: March 31, 1977
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    The plastic deformation of an Al plate (0.05 to 1.0mm-thickness) by an underwater exploding wire was observed by an image converter camera. The initial capacitor energy exploded cupper wire (0.08mm-diam. and 8mm-long ) was 40J (80μF charged 1.0kV). At the deformation, the plate was placed on the water surface (Method A), between the water surface and electrodes (Method B), between the electrodes and the bottom of the container (Method C) or perpendicularly to the water surface (Method D).
    The results obtained show that
    (1) deformation of metal plate was effected by the thickness of the plate and stand-off. The thinner the plate and/or the longer the stand-off, the shorter the depth of deformation. In Method B at the condition of short distance between the water surface and the plate, the characteristics on the deformation were similar to those by Method A. As this distance became longer, those characteristics changed to similar ones of Method C.
    (2) the typical phenomenon in Method A was the formation of jet in a vapor bubble. The typical phenomenon in Method C was the formation of a lot of cavities on the plate. They were produced and expanded near at the maximum radius of a vapor bubble.
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  • Mamoru KUBOTA, Yuji TAMURA
    1977 Volume 10 Issue 20 Pages 9-18
    Published: March 31, 1977
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Study on steel plate drilling with electro-chemical-discharge machining (ECDM) is carried out experimentally by a machine employed for the experiment with a single phase full-wave rectified 100Hz generator. Electrolyte of NaCl or NaNO3 20% water solution is fed through a hole of graphite electrode by an air pressure of 10kgf/cm2. Concluding from the results obtained ECDM can drill a hole with high feed speed of 10-80mm/min. In ECDM electrochemical removal proceeds with extremly high current density and to it electrodischarge removal of high speed EDM is added, consequently ECDM has higher feed speed than that of mere ECM or EDM.
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