Patent ID: 7797974
Filing Date: 2010-09-21
Classification: B21B

Abstract:
1. A method for measuring and adjusting the flatness of a steel strip ( 1 ), especially a steel foil ( 1 a ), for the cold rolling operation in a cluster mill ( 2 ), especially in a 20-roll Sendzimir rolling mill ( 2 a ), which comprises the following steps: determination of an actual distribution of the flatness ( determination of a flatness error ( mathematical approximation of the received flatness error ( decomposition of an approximated flatness error into scalar flatness error components (C computation of a first and additional controller output signals from the flatness error components to activate a plurality of actuators ( the approximated flatness errors are decomposed in such a way that the resulting flatness error components (C a first actuator in the form of a hydraulic adjustment mechanism ( each of the additional controller output signals in the form of scalar correcting variable components is computed on the basis of one of the remaining orthogonal components (C the scalar correcting variable components are combined into suitable activating signals for individual excenter actuators (