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Wire cutting electrical discharge machine with wire annealing for threading

  • US 5,603,851 A
  • Filed: 04/23/1996
  • Issued: 02/18/1997
  • Est. Priority Date: 08/14/1995
  • Status: Expired due to Term
First Claim
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1. A wire electrical discharge machine comprising:

  • an upper wire head mounted to a head so that it is vertically movable;

    a lower wire head installed below a work arranged below the upper wire head;

    an automatic wire feeder to feed a wire electrode paid out from a wire electrode supply source through rollers disposed above the head to a machining area of the work;

    a cylinder device extending from the top of the head to its bottom and having a cylinder secured to the head and a piston reciprocatingly moving in the cylinder;

    a holder secured to a slider moving vertically along the cylinder in response to the motion of the piston of the cylinder device;

    a feed pipe through which the wire electrode is passed and which is secured to the holder so that it extends vertically down, the feed pipe being adapted to insert the wire electrode supplied from the wire electrode supply source through the upper wire head, the holes formed in the work and the lower wire head;

    a pair of anneal rollers provided to the holder which are driven to clamp and feed the wire electrode and through which an electric current can be passed to anneal the wire electrode;

    a cutter installed on the head to cut the wire electrode;

    a pair of clamping members provided to the head at a location below the cutter, the clamping members being adapted to be opened and closed to clamp the wire electrode for annealing;

    a waste wire clamp to remove the cut wire electrode that was cut by the cutter;

    a wire electrode recovery device to pull out and recover the worn wire electrode discharged from the lower wire head; and

    a controller to control the vertical movement of the holder, the feeding of the wire electrode by the anneal rollers, and the annealing of the wire electrode by clamping the wire electrode with the clamping members, driving the anneal rollers in the reverse direction to tense the wire electrode and, in this tensed state, annealing a portion of the wire electrode between the anneal rollers and the clamping members.

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