ROLLING METHOD

PURPOSE:To stabilize different peripheral speed rolling and to prevent the failure of roll necks and bearings by bringing the center of rotation of back up rolls on the line in the resultant force direction of the horizontal force and vertical force acting on work rolls by rolling or near to the same. CONSTITUTION:A four high mill stand into which a pair of the upper and lower work rolls Wu1, Wl1 and backup rolls Bu1, Bl1 are built executes different peripheral speed rolling by the upper roll Wu1 as a driven roll on the non-driving side and the lower roll Wl1 as the positive driving roll on the driving side. The upper roll Bu1 for the lower peripheral speed side roll Wu1 is disposed on the outlet side of the rolling mill and the lower roll Bl1 for the high peripheral speed side roll Wl1 is disposed on the inlet side of the rolling mill to offset the horizontal forces acting on the respective rolls Wu1, Wl1. The different peripheral speed rolling is thereby stabilized and the failure in the roll neck part and bearing part is prevented.