Patent ID: 6227025
Filing Date: 2001-05-08
Classification: B21B

Abstract:
A rolling method of rolling a material from a front-stage rolling mill having front-stage rolling rollers to a post-stage rolling mill having post-stage rolling rollers through guiding rollers of a roller guide, comprising:setting a gap between the guiding rollers to a standard outer size of a standard material to be rolled by the front-stage rolling rollers, and measuring a standard embracing force formed by the guiding rollers at the gap when the standard material passes therethrough,operating the front-stage rolling rollers, guiding rollers and post-stage rolling rollers to roll a material to be rolled,measuring a post outer size of the rolled material rolled by the post-stage rolling rollers,comparing the post outer size of the rolled material and a desired outer size of the rolled material,comparing an embracing force of the guiding rollers during a rolling with the standard embracing force in case the post outer size of the material is smaller than the desired outer size of the material, andadjusting the rollers so that the post outer size of the material becomes substantially equal to the desired outer size by taking one of steps:(a) reducing a roll gap between the front-stage rolling rollers in case the embracing force during the rolling is greater than the standard embracing force,(b) reducing the roll gap between the front-stage rolling rollers and enlarging a roll gap between the post-stage rolling rollers in case the embracing force during the rolling is greater than the standard embracing force,(c) enlarging the roll gap between the front-stage rolling rollers in case the embracing force during the rolling is less than the standard embracing force, and(d) enlarging the roll gap between the front-stage rolling rollers and enlarging the roll gap between the post-stage rolling rollers in case the embracing force during the rolling is less than the standard embracing force.