DIE FOR EXTRUDING ALUMINUM OR ALUMINUM ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a die for extruding Al or an Al alloy capable of preventing a crack or a high-temperature wear and abrasion of the die at the time of extruding work to extend the service life of the die by forming a high- temperature abrasion resistant alloy coating in the required portion of the die for extruding the Al alloy so that the die causes no distortion or no peeling. SOLUTION: The required portion of the die surface is formed as a roughened surface of a surface-roughness 5μmRz or more and coatings of a Co base alloy, a Ni base alloy, a Cr base alloy and other alloys having high-temperature abrasion resistance are formed on the roughened surface through thermal spraying. After forming the coatings of the alloys, the die is held at 500-800°C for a predetermined time or the surface-roughness of the coatings of the alloys is preferably made to 10μmRz or less. Further, the coating thickness of the alloys is preferably 10μm to 200μm. COPYRIGHT: (C)2003,JPO