Combined wire electrode electrical discharge machine and initial hole forming device

摘要

PCT No. PCT/JP85/00176 Sec. 371 Date Dec. 3, 1985 Sec. 102(e) Date Dec. 3, 1985 PCT Filed Apr. 8, 1985 PCT Pub. No. WO85/04608 PCT Pub. Date Oct. 24, 1985.A wire electrode electrical discharge machine includes an initial hole forming device mounted on a frame unit attached to the vertical slider of the electrical discharge machine; the initial hole forming head is vertically movable on the frame unit and has a rotary chuck for holding a hollow bar electrode; electrical switches on the frame unit generate signals upon the detection of the initial hole forming head being position at an initial hole forming position and at a resting position in its vertical movement on the frame unit and lateral movement of the upper wire guiding unit toward the initial hole forming head is inhibited while the initial hole forming head is located at the initial hole forming position.