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WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS, MACHINING CONTROL DEVICE, AND MACHINING CONTROL PROGRAM

  • US 20150290733A1
  • Filed: 10/30/2012
  • Published: 10/15/2015
  • Est. Priority Date: 10/30/2012
  • Status: Abandoned Application
First Claim
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1. A wire electrical discharge machining apparatus, comprising:

  • a machining power source that applies a voltage between a wire and a workpiece;

    a wire feed roller that is arranged on a side from which the wire is fed and feeds the wire;

    a winding roller that is arranged on a side to which the wire is collected and winds the wire at a constant speed;

    a tension control motor that controls a tension and a feed speed of the wire extending under tension between the wire feed roller and the winding roller by controlling the wire feed roller;

    an external force estimator that calculates an estimated value of an external force applied to the tension control motor as an external force estimate;

    a determining unit that determines, on a basis of the external force estimate, whether there is a sign indicative of breaking of the wire;

    a power control device that, when it is determined that there is a sign indicative of breaking of the wire, controls the machining power source such that electrical discharge machining energy that the machining power source is to apply between the wire and the workpiece is reduced;

    a motor position detector that detects a rotational position of the tension control motor; and

    a motor control device that controls the tension control motor on a basis of the rotational position such that a feed speed of the wire stays within a predetermined range, whereinthe rotational position of the tension control motor detected by the motor position detector and a current detection signal detected with respect to current supplied to the tension control motor by the motor control device are input to the external force estimator as information on an operation of the wire feed roller, andthe external force estimator calculates the external force estimate by using the rotational position and the current detection signal that have been input.

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