Wire refeeding device and method for wire-cut electroerosion apparatus

摘要

A wire refeeding device for a wire-cut electroerosion apparatus comprising a movable table (21) on which one of two clampers (34,45) for clamping a present wire in use (2a) and a new wire (2b) pulled out from a spare bobbin, respectively, is provided. When the present wire in use becomes almost empty, one of clamper (35) opposes to the other clamper (45) to get a sheared end of the present wire and a leading end of the new wire butted together. The welding circuit (80) joins the butted wires to refeed the joined wire smoothly into the machining slit whereby a continuous machine operation is performed.