Research on the Set Curve for Tandem Cold Rolling Mill Automatic Flatness Control

Flatness set curve is the target of strip flatness control system which represents the desired strip flatness quality. If the longitudinal residual stress along the transverse distribution of the strip can be measured accurately by the flatness measuring roll, the actual flatness can be controlled accurately. However the actual strip flatness is different from the online measured flatness because of the various influence factors. The purpose of the flatness set curve is to compensate these factors and to satisfy the requirements of next lines. The optimizations of the set curve are proposed for the uneven temperature distribution of the rolled strip in this paper. Verified by the rolling experiments, the strip flatness quality is improved.