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Wire electric discharge machine capable of starting machining from short-circuit state

  • US 10,144,076 B2
  • Filed: 08/11/2015
  • Issued: 12/04/2018
  • Est. Priority Date: 08/12/2014
  • Status: Active Grant
First Claim
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1. A wire electric discharge machine, comprising:

  • a discharge inducing circuit including a first DC power supply connected to a machining gap between a wire electrode and workpiece via a first switching element and a current limiting resistance;

    a current supply circuit including a second DC power supply connected to the machining gap via a second switching element;

    a voltage detection circuit that detects a voltage of the machining gap;

    a short-circuit detection circuit that detects a short-circuit state between the wire electrode and the workpiece based on the voltage detected by the voltage detection circuit; and

    a control circuit that controls on and off of the first switching element and the second switching element, whereinthe control circuit is configured to supply a first current to process the workpiece, and a second current until a predetermined state is reached after starting machining,the second current being (i) smaller than the first current, (ii) insufficient to fuse the wire electrode even in a short-circuit state with the workpiece, but (iii) sufficient to form a discharge arc between the wire electrode and the workpiece, andthe first current and the second current are discrete and separated from each other.

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