Patent ID: 7364492

Claim:
An on-line grinding method for a work roll, adapted to press a rotating grinding wheel having elasticity against a work roll of a rolling mill to grind the work roll, characterized in that when a pressing load of the rotating grinding wheel reaches a set load F, which has been set beforehand at a value which is lower than a set grinding pressing load F 0 , after the rotating grinding wheel contacts the work roll, a forward velocity of the rotating grinding wheel is reduced to decrease an overshoot by which the pressing load of the rotating grinding wheel on the work roll exceeds the set grinding pressing load F 0 , characterized in that the load F which has been set beforehand has a value in a range satisfying the following equation (A): F≦F 0 −K×V 1 ×Δt (A) where F: set load [N], F 0 : set grinding pressing load [N], K: grinding wheel spring rigidity [N/mm], V 1 : forward velocity [mm/s] of grinding wheel before velocity reduction, and Δt: control delay time [s].