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WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS

  • US 20140144885A1
  • Filed: 07/06/2011
  • Published: 05/29/2014
  • Est. Priority Date: 07/06/2011
  • Status: Active Grant
First Claim
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1. A wire electrical discharge machining apparatus comprising:

  • a collecting roller that collects a wire electrode;

    a collecting motor that causes the wire electrode to travel at a predetermined speed by driving the collecting roller;

    a tension roller that applies tension to the wire electrode between the tension roller and the collecting roller;

    a tension motor that drives the tension roller;

    a speed calculating unit that calculates a rotational speed of the tension motor;

    a speed fluctuation compensating unit that generates a speed compensation value that suppresses fluctuation of a rotational speed of the tension motor on a basis of a rotational speed output from the speed calculating unit; and

    a breakage detecting unit that detects a breakage of the wire electrode on a basis of a comparison of a preset breakage detection threshold and a speed compensation value output from the speed fluctuation compensating unit.

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