Electric heating – Metal heating – Cutting or disintegrating
Patent
1987-03-18
1988-11-08
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
204206, B23H 702, B23H 710
Patent
active
047835834
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electric discharge machining appratus of the wire-cutting type for machining a work piced by utilizing an electric discharge between a wire electrode and the work piece. More particularly, the present invention relates to an improvement of an automatic tension mechanism of a wire electrode.
BACKGROUND ART
An electric discharge machining apparatus of the wire-cutting type for machining a work piece by utilizing an electric discharge between a wire electrode and the work piece to be machined in known. In general, the conventional electric discharge machining apparatus of the wire-cutting type comprises an upper wire guide member for guiding a wire electrode above a work table for holding a work piece thereon and a lower wire guide member for guiding the wire electrode below the work table. For the electric discharge machining operation, the wire elect rode is tightly string between the upper wire gude member and the lower wire gude member, and the wire electode is continuously fed downward by a wire feed device arranged above the upper wire guide member. In this conventional electric deischarge machining apparatus of the wire-cutting type, where it is necessary to change the electric discharge machining position, the wire electrode must be once cut between the upper and lower wire guide members and the wire electrode automatically string between the upper and lower wire guide members again. Furthermore, where the wire electrode is broken in the discharge region by abnormal electric dischargeing or the like, the broken end of the wire electrode must be pulled up from the discharge region, the readily bending portion or the surface-roughened portion of the wire electrode cut out, and the wire electrode then automatically string between the upper wire guide member and the lower wire guide member. Accordingly, in the conventional electric discharge machining apparatus of the wire-cutting type, a wire-cutting device is disposed above or below the upper wire guide member.
In the conventional electric discharge machining apparatus of the wire-cutting type in which the wire-cutting device is disposed above the upper wire guide member, the lower end, that is, the free end, of the cut wire electrode is fed downward by the wire feed device. The free end of the wire electrode is readily caught in narrow wire passages of the upper and lower wire guide members or in holes or grooves of the work piece, and therefore, it is difficult to perform automatic stringing of the wire electrode accurately In the electric discharge machining apparatus of the wire-cutting type in which the wire-cutting device is disposed below the upper wire guide member, it is difficult to smoothly pass the free end of the wire electrode through the holes or grooves of the work piece or the narrow passage of the lower wire guide member.
DISCLOSURE OF THE INVENTION
In accordance with the present invention, there is provided an electric discharge machining apparatus of the wire-cutting type, which comprises a work table for holding a work piece thereon, upper and lower wire guide members arranged above and below the work table, each having a wire passage perforated in the vertical direction, means for supplying a wire electrode to be passed through the wire passages of the upper and lower wire guide members, a wire feed device disposed above the upper wire guide member to give downward and upward feeds to the wire electrode, spray liquid feed means for feeding a spray liquid into the wire passage of the upper wire guide member, and a wire-treating unit movable in the horizontal direction relative to the upper wire guide member between the upper wire guide member and the work table to traverse the wire electrode extending downward from the wire passage of the upper wire guide member, wherein the wire-treating unit has a base block and a movable block which can approach to and separate from the base block to define a slit and a nozzle hole that can be opened and closed between said two blocks, th
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Aso Toshiyuki
Ishibashi Tamotsu
Kinoshita Hiroshi
Obara Haruki
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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