The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 2004
Filed:
Sep. 13, 2002
Heinrich Groos, Herborn, DE;
Bernd Barthel, Herborn, DE;
Tobias Noethe, Herborn, DE;
Christoph Dietrich, Herborn, DE;
Berkenhoff GmbH, Heuchelheim, DE;
Abstract
A wire electrode for spark erosion cutting of metals, electrically-conducting ceramics etc., comprising either a homogenous centre ( ) 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 ( ) predominantly comprising &bgr;-brass, and an outer sheath coating ( ) predominantly comprising &ggr;-brass, wherein the fraction of &bgr;/&bgr;′-phase or &ggr;-phase in the two sheath coatings is at least 60%. The ratio of the coating thickness of &bgr;-brass to &ggr;-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.