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FEED CONTROL METHOD FOR WIRE CUTTING ELECTROCHEMICAL DISCHARGE MACHINING AND APPARATUS THEREOF

  • US 20120292292A1
  • Filed: 07/26/2012
  • Published: 11/22/2012
  • Est. Priority Date: 08/14/2008
  • Status: Active Grant
First Claim
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1. A feed control method for wire cutting electrochemical discharge machining, comprising:

  • performing a machining operation that makes a first speed of a servo feed of a workpiece identical to a predetermined initial velocity;

    making and activating a timer to calculate the amount of time during the workpiece is not in contact with a wire electrode;

    defining an initial input value;

    reading a wire tension value of the wire electrode;

    generating a new wire tension value by filtering the wire tension value;

    determining whether the wire electrode is in contact with the workpiece by determining whether the new wire tension value is greater than a sum of the initial input value and a boundary value, wherein the new wire tension value is greater than the sum of the initial input value and the boundary value when the wire electrode is in contact with the workpiece;

    performing a separation operation to separate the wire electrode from the workpiece by a predetermined distance if the wire electrode is in contact with the workpiece;

    making the first speed of the servo feed identical to a second speed of the servo feed after the separation operation is finished, wherein the second speed of the servo feed is lower than the predetermined initial velocity;

    determining whether the amount of time of the timer has reached a predetermined non-contact time amount if the wire electrode is not in contact with the workpiece;

    instructing the workpiece to proceed with the machining operation with the first speed of the servo feed if the time has not reached the predetermined non-contact time amount; and

    making the first speed of the servo feed identical to a third speed of the servo feed to proceed with the machining operation if the time amount reaches the predetermined non-contact time amount.

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