METHOD FOR CONTROLLING SURFACE ROUGHNESS OF ROLLING ROLL

PURPOSE:To properly ensure the projecting part of rolling rall before rolling and properly maintain the life of rolling roll by working the surface roughness of rolling roll in the range of specified value of Rsk by dulling work. CONSTITUTION:The relationship between a rolling distance (indicated by the number of revolution of rolling roll) and Rsk is shown by rolling load. The black plots show embodiments that this invention is not applied and the white plots of circle, square and reverse triangle show embodiments that this invention is applied. By one or more kinds of working methods of shot blasting, electric discharge machining and laser dulling work, the surface roughness of rolling roll is taken as Rsk of -0.4 to +0.4. Rolling of steel sheet of 2000 revolutions or more is executed under a rolling load of 0.2 to 2ton/mm on this rolling roll. In this way, the projecting part of rolling roll before rolling is properly ensured, wear of rolling roll due to rolling is restrained in the proper range and the life of rolling roll can be properly maintained.