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ELECTRIC DISCHARGE MACHINING APPARATUS

  • US 20150217391A1
  • Filed: 08/07/2013
  • Published: 08/06/2015
  • Est. Priority Date: 08/08/2012
  • Status: Active Grant
First Claim
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1. An electric discharge machining apparatus for machining a work piece by supplying a current pulse to a machining gap formed between the work piece and a tool electrode while alternately switching between a straight polarity, in which the work piece is a positive potential and the tool electrode is a negative potential, and a reverse polarity, in which the work piece is the negative potential and the tool electrode is the positive potential, the electric discharge machining apparatus comprising:

  • a power supply having a positive pole and a negative pole;

    a first switch disposed between the positive pole of the power supply and the work piece;

    a second switch disposed between the work piece and the negative pole of the power supply;

    a third switch disposed between the tool electrode and the negative pole of the power supply;

    a fourth switch disposed between the positive pole of the power supply and the tool electrode; and

    a pulse generating device controlling the first switch, the second switch, the third switch, and the fourth switch,wherein while one of the first switch and the third switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the first switch and the third switch so as to supply a series of current pulses with the straight polarity to the machining gap, andwhile one of the second switch and the fourth switch is on, the pulse generating device repeats an on/off switching operation of the other switch of the second switch and the fourth switch so as to supply a series of current pulses with the reverse polarity to the machining gap.

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