METHOD FOR TREATING SURFACE OF PRESSING TOOL AND PRESSING TOOL SURFACE TREATED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for treating the surface by which the wear resistance of the surface of a punching tool and other tools is improved at comparatively low cost and prolongation of the life of the tool is attained without performing expensive treatment. SOLUTION: This surface treating method includes that the surface is hardened by projecting coal ashes (P) onto the surface of the part (12) where friction is generated at least at press working in the pressing tool (10). Preferably, the coal ashes are projected so that the hardened layer having at least 5μm thick is formed. It is preferable that the coal ashes used are fly ashes the average particle diameter of which is adjusted to 20μm or less. COPYRIGHT: (C)2007,JPO&INPIT