SURFACE ROUGHENING METHOD FOR COLD ROLLING ROLL

摘要

PURPOSE:To provide the surface roughening method of the cold rolling roll capable of obtaining the roll excellent in wear resistance. CONSTITUTION:In the surface roughening method to perform surface roughening on the cold rolling roll by beam irradiation such as a laser beam and an electron beam or electric discharge machining, surface roughening is performed by the beam irradiation or electric discharge machining on the roll surface, liquid nitrogen is blown against the surface roughened part within 60 minutes from right after surface roughening and treatment to reduce the roll surface temperature to under -50 deg.C is performed. In addition, the residual austenite quantity in a surface roughened part surface layer is preferably regulated to 2.5 to 16% by controlling blowing flow rate of the liquid nitrogen.