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Method and apparatus for electrical discharge machining using variable capacitance and variable inductance

  • US 5,585,014 A
  • Filed: 06/30/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 06/30/1993
  • Status: Expired due to Term
First Claim
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1. An electrical discharge machine for supplying a high peak current to a machining gap formed between an electrode and a workpiece to machine the workpiece at high speed and supplying an alternating-current, high-frequency current to said machining gap to finish the workpiece, comprising:

  • high-speed machining feeder cables connected electrically to the electrode and the workpiece at one end, which electrical connection is maintained during both high-speed machining and finishing;

    alternating-current, high-frequency machining feeder cables connected electrically to the electrode and the workpiece at one end;

    a high-speed machining power supply for supplying said machining gap with the high peak current through said high-speed machining feeder cables in high-speed machining;

    an alternating-current, high-frequency machining power supply for supplying the machining gap with the alternating-current, high-frequency current through said alternating-current, high-frequency machining feeder cables in finishing; and

    an impedance matching circuit for conducting impedance matching on the machining gap to suppress the influence of the capacitance of the high-speed machining feeder cables when they are electrically connected to the electrode and the workpiece in finishing.

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