Electric heating – Metal heating – Cutting or disintegrating
Patent
1998-03-03
1989-03-28
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
204206, B23H 710
Patent
active
048166367
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire cut electric discharge machine and, more particularly, to a wire cut electric discharge machine capable of automatic preparation for restarting the electric discharge machining of a work by automatically extending a wire electrode between an upper head and a lower head each having a built-in wire guide after repairing the broken end of the wire electrode at a repairing position outside an electric discharge machining region, when the wire electrode is broken during electric discharge machining.
BACKGROUND ART
A wire cut electric discharge machine employing a wire-shaped or belt-shaped electrode (hereinafter referred to as "wire electrode"), equipped with a clamping mechanism for clamping the wire electrode on the wire feeding side when the wire electrode is broken during electric discharge machining, and a wire feeding mechanism for feeding the wire electrode clamped on the feeding side as far as the extremity of the wire electrode coincides with a predetermined position, and capable of automatically passing the wire electrode from the feeding side through the work has been proposed, for example, in Japanese Unexamined Patent Publication (Kokai) No. 56-3146. This known wire cut electric discharge machine prepares for restarting a wire cut electric discharge machining operation by passing the broken end of the wire electrode through a wire electrode receiving hole formed in the work after determining that the broken end of the wire electrode has been clamped, and then drawing the wire electrode by a motor-driven electrode drawing mechanism to extend the wire electrode between the upper and lower heads disposed above and below the electric discharge machining region, respectively. In this known wire cut electric discharge machine, the procedure for preparing the wire cut electric discharge machine for restarting the wire cut electric discharge machining as well as the wire cut electric discharge machining operation is controlled by a CNC unit (Computer-aided Numerical Control unit). However, when the wire cut electric discharge machine is passing the wire electrode through the wire electrode receiving hole of the work after the occurrence of he breakage of the wire electrode, if the wire electrode is fed without repairing the broken end of the wire electrode to pass the same through the wire electrode receiving hole of the work, often the wire electrode cannot be passed properly through the wire electrode receiving hole of the work due to the residual bend and/or roughened surface of the broken end of the wire electrode caused by electric discharge between the wire electrode and the work, or the diagonal running of the wire electrode for taper-machining of the work. Accordingly, it is necessary to repair the broken end of the wire electrode by removing the bent and roughened portion of the broken end of the wire electrode and to remove the chips of the wire electrode from the work before automatically connecting the wire electrode under the control of the CNC unit to prepare the wire electrode for restarting the wire cut electric discharge machining.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a method of automatically repairing the broken wire electrode, and a wire cut electric discharge machine comprising means for carrying out the method, which are capable of complying with the foregoing necessity.
In view of the object of the invention, the present invention provides a wire cut electric discharge machining method, in which a wire electrode fed from a wire electrode supply device is extended between respective wire guides of upper and lower heads disposed above and below an electric discharge machining region, respectively, by means of a jet of a machining liquid for automatic preparation for restarting wire cut electric discharge machining operation, comprising steps of: drawing out a broken end of the wire electrode from a work when said wire electrode is broken during electric discharge machinin
REFERENCES:
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patent: 4242559 (1980-12-01), Roemer et al.
patent: 4412118 (1983-10-01), Nomura et al.
patent: 4523074 (1985-06-01), Okuda
patent: 4539459 (1985-09-01), Yamagata
patent: 4547647 (1985-10-01), Schneider
patent: 4698476 (1987-10-01), Yamamoto et al.
Aso Toshiyuki
Kinoshita Hiroshi
Obara Haruki
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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