Wire cutting electrical discharge machine with wire annealing for threading

摘要

A wire electrical discharge machine that reliably feeds the wire electrode at high speed into an upper wire head, holes in the work and a lower wire head. This wire electrical discharge machine moves the holder, which has a vertically extending feed pipe secured thereto, up or down at high speed by activating the cylinder device. At the same time, the lower end of the wire electrode is clamped by the clamping members and the anneal rollers are driven in the reverse direction to tense the wire electrode. With the wire electrode tensed in this way, the anneal processing is performed. This construction makes the machine compact. Further, when the wire electrode is to be inserted into the holes in the work, it is fed at low speed by the anneal rollers. When the wire electrode rides on the jet stream in the jet stream guide pipe, the wire electrode is moved at high speed by the anneal rollers to reduce the time taken by the wire electrode feeding.