METHOD OF ROLLING PLATE WITH REVERSIBLE ROLLING MILL

PROBLEM TO BE SOLVED: To accurately correct plate crown and plate shape by measuring the plate crown before the i-th pass and plate crown after the i-th pass and flatness to collect rolling data, calculating the plate crown after the pass with a plate crown model, calculating roll profile so as to agree with the measured values, and also calculating in the same way for flatness. SOLUTION: From the measured value of the plate crown before and after the i-th pass, the flatness after the i-th pass is calculated with a flatness calculation model, and the difference of the flatness after the i-th pass from the measured value is calculated. At least in one pass of passes after the (i+1)-th pass and passes of the following plate, pass schedule setting calculation is made using the roll profile, and work roll bending force setting calculation to correct error of flatness is made. The rolling is done using the resulting pass schedule and work roll bending force.