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WIRE-CUT ELECTRIC DISCHARGE MACHINE HAVING WIRE TENSION CONTROL FUNCTION

  • US 20080217300A1
  • Filed: 02/11/2008
  • Published: 09/11/2008
  • Est. Priority Date: 03/08/2007
  • Status: Active Grant
First Claim
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1. A wire-cut electric discharge machine having a wire tension control function, comprising:

  • a first motor for feeding a wire electrode to a workpiece to be machined;

    a second motor for delivering the wire electrode from the workpiece;

    tension detecting means which is located between the workpiece and the first motor and detects a tension on the wire electrode;

    speed detecting means for detecting respective rotational speeds of the first and second motors;

    first control means for controlling the rotational speed of the first motor to be equal to a preset rotational speed;

    second control means for controlling a rotational torque of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value;

    third control means for controlling the rotational speed of the second motor so that the tension on the wire electrode detected by the tension detecting means is at a preset value; and

    switching control means which causes the first control means to drivingly control the first motor, causes the second control means to perform torque control for the second motor, thereby running the wire electrode, and switches the second control means over to the third control means to perform speed control for the second motor when machining is started.

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