Patent ID: 6781081
Filing Date: 2004-08-24
Classification: B23H

Abstract:
A wire electrode for spark erosion cutting of metals, electrically-conducting ceramics, comprising either a homogenous centre (1) made of a metal or of a metal alloy, or a composite centre, and comprising at least two sheath coatings made of Zn alloys, with said coatings wearing during erosion, characterised in thatthe inner sheath coating (2) predominantly comprises &bgr;-brass, while the outer sheath coating (3) predominantly comprises &ggr;-brass, wherein the fraction of &bgr;/&bgr;â€²-phase or &ggr;-phase in the two sheath coatings is at least 60%, and wherein the ratio of the coating thickness of &bgr;-brass to &ggr;-brass is between 0.3 and 7, and the sum of the thicknesses of both sheath coatings in relation to the external diameter of the electrode is between 0.1 and 0.3.