Patent ID: 8210011
Filing Date: 2012-07-03
Classification: B21B

Abstract:
1. A continuous repetitive rolling method for a metal strip, comprising the steps of: performing a series of operations multiple times, each series of operations consisting of (i) performing rolling with shear deformation one time under asymmetric rolling condition that an upper-side rolling condition between an upper working roll and the metal strip and a lower-side rolling condition between a lower working roll and the metal strip are asymmetric, and (ii) then performing skin pass rolling one time such that a reduction in strip thickness is within a range from 3% to 10% under symmetric rolling condition that the upper-side rolling condition and the lower-side rolling condition are symmetric, wherein the rolling with shear deformation under asymmetric rolling condition is either differential-speed rolling in which the upper and lower working rolls rotate at different speeds or a rolling in a state which interfaces between the upper and lower working rolls and the metal strip have different friction coefficients.