Wire electrode for spark erosion cutting

B - Operations – Transporting – 23 – H

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B23H 1/04 (2006.01) B23H 1/00 (2006.01) B23H 7/08 (2006.01)

Patent

CA 2401102

A wire electrode for spark erosion cutting of metals, electrically-conducting ceramics etc., comprising either a homogenous centre (1) made of a metal or of a metal alloy, or a composite centre made from a steel core with a coating of copper or copper alloy, wherein the wire electrode comprises at least two sheath coatings made of zinc alloys, with said coatings wearing during erosion. In order to increase performance during high-speed cutting, such a wire electrode comprises an inner sheath coating (2) predominantly comprising .beta.-brass, and an outer sheath coating (3) predominantly comprising -y-brass, wherein the fraction of .beta./.beta.'-phase or y-phase in the two sheath coatings is at least 60 %. The ratio of the coating thickness of .beta.-brass to y-brass is between 0.3 and 7. 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.

Un fil-électrode destiné au découpage des métaux, des céramiques conductrices d'électricité, etc., par électro-érosion est composé d'un centre homogène (1) fabriqué avec un métal ou un alliage métallique, ou un centre composite comportant un cour d'acier avec un revêtement de cuivre ou d'un alliage de cuivre, le fil-électrode comportant au moins deux gaines d'alliage de zinc, celles- ci s'usant avec l'électro-érosion. Afin d'accroître le rendement lors du découpage à haute vitesse, l'électrode-fil comporte une gaine interne (2) composée principalement de laiton bêta, et une gaine externe (3) composée principalement de laiton y, où la fraction phase bêta/bêta' ou phase y dans les deux gaines est d'au moins 60 %. Le rapport entre l'épaisseur du laiton bêta et l'épaisseur du laiton y se situe entre 0,3 et 7. La somme des épaisseurs des deux gaines par rapport au diamètre externe se situe entre 0,1 et 0,3.

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