Patent ID: 8476548
Filing Date: 2013-07-02
Classification: B23H,B23K

Abstract:
1. A method of cutting out a part with making partially welded spots in wire electrical discharge machining comprising a wire electrode unwound from a source bobbin is threaded through a workpiece lying below an upper head and further a lower head lying below the workpiece in opposition to the upper head, and then the wire electrode is fed through a guide member lying downstream of the lower head towards a waste-wire hopper; comprising the steps of, changing electrical processing condition applied across the wire electrode and the workpiece from a cutting phase to a welding phase at more than one spot of a plurality of spots in a cutting path or kerf of a predetermined contour on the workpiece to fuse partially the wire electrode at the spots, and welding together the workpiece and the part cut out from the workpiece at the spots with using the fused wire electrode to make a coalescence, thereby keeping the cut-out part at the spots against falling away apart from the workpiece.