| 摘要 |
PCT No. PCT/JP91/01678 Sec. 371 Date Sep. 17, 1992 Sec. 102(e) Date Sep. 17, 1992 PCT Filed Nov. 30, 1991 PCT Pub. No. WO92/09396 PCT Pub. Date Jun. 11, 1992.When performing contour machining of a workpiece by the wire cut electro-discharge method, a first holding elements, formed of an electromagnet, etc., for maintaining a corepiece, is fixed to a second holding elements which is fixed to an upper wire guide block, so that the first holding elements can be freely loaded and removed from the second holding elements. Therefore, before the corepiece is completely cut out, the corepiece can be held and maintained by arranging the corepiece and the rest of the work piece, so that they are straddled by the first holding elements. Then, after the corepiece is cut out, the first holding elements is held by the second holding elements, the core can be drawn out of the workpiece by raising and moving the second holding elements, and can then be transferred to a prescribed position. The corepiece handling operation can be rapidly, stably, and automatically performed using a simple device.
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