Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 24, 2009
Patent Application Number
12042537
Date Filed
March 5, 2008
Patent Primary Examiner
Patent abstract
A ferrous metal tool is provided for the forming of light metal sheet workpieces at elevated temperatures, with the forming surface of the tool prepared to minimize friction and adhesion when engaged in deformation of the hot sheet metal. The forming surface of a steel tool is nitrocarburized to form a compound layer and diffusion layer on the surface. The compound layer initially comprises an outer gamma-phase material and an underlying epsilon phase material. Gamma-phase material is removed to expose underlying epsilon phase material, and low friction particles are embedded in the modified nitrocarburized compound layer of the forming tool.
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