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PULSE GENERATOR FOR EDM MACHINE

  • US 3,832,510 A
  • Filed: 06/08/1973
  • Issued: 08/27/1974
  • Est. Priority Date: 06/16/1972
  • Status: Expired due to Term
First Claim
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1. In an electrical discharge machining apparatus for electroerosion of material from an electrode workpiece by means of consecutive intermittent pulses being applied across a machining gap between said electrode workpiece and an electrode tool, a pulse generator comprising a DC power supply having a first and a second terminal, an electromagnetic energy accumulator, a first make and break element connected between the first of the terminals of said power supply and a first terminal of said accumulator, a first unidirectional element connected between the second terminal of said power supply and the first terminal of said accumulator, a second unidirectional element connected between the second terminal of said accumulator and the first terminal of said power supply, and a second make and break element connected such as to provide a current path in a main circuit when at least said first make and break element is closed, in a first auxiliary circuit when at least said first make and break element is open, in a second auxiliary circuit when at least said second make and break element is open, and in a third auxiliary circuit when both said make and break elements are open, means for controlling said first make and break element for maintaining the current flowing through said accumulator at a predetermined value, and means for controlling said second make and break element at a predetermined frequency for controlling the period of each current-voltage pulse across the machining gap.

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