Method for cutting an electrode-workpiece by electrical discharge (spart erosion) machining

摘要

The wire- or ribbon-shaped electrode comprises a central core surrounded by an external metal layer composed of at least 50% of a metal or of an alloy of several metals having a low vaporisation temperature and having a low latent heat of vaporisation such as cadmium, tin, lead, etc. This layer constitutes a heat shield shielding against heat influx caused by the discharges and enables the machining current to be increased without risking the wire breaking. This 15 mu thick metal layer is deposited on the wire (1) in a tank (16) containing a metalloplastic (galvanoplastic) bath before passing into the machining zone (3), which ensures that the tool (1) is continuously regenerated. <IMAGE>