Abstract: A method of controlling a transverse shape of a strip rolled by a rolling mill having a plurality of shape correcting devices, the method including the steps of detecting a change in a strip rolling force, and a tension distribution of the rolled strip in the width direction. Based on the detected tension distribution, a strain distribution of the rolled strip is calculated, and the calculated strain distribution is used to calculate a shape parameter which represents a shape error of the rolled strip. Based on the detected change in the rolling force and the calculated shape parameter, disturbance values of the rolling mill which should be zeroed by the shape correcting devices are estimated so as to offset a delay in the detection of the tension distribution which is reflected on the shape parameter. The shape correcting devices are controlled according to the estimated disturbance values, without an influence of the delay in the detection of the tension distribution.

Abstract: The present invention relates to a method and device for controlling a thickness of a strip in a rolling mill which has a roll gap adjusting device and a rolling speed adjusting device. Rolling environment disturbances received by the mill are classified into a first disturbance for which only the rolling speed should be compensated, a second disturbance for which only the roll gap should be compensated, and a third disturbance for which both the rolling speed and the roll gap should be compensated. The values of the first, second and third disturbances are estimated, based on detected values of a variation of a roll force exerted on the given rolling stand, variations of a thickness of the strip on the downstream and upstream sides of the given rolling stand, and a variation of a tension of the strip on the upstream side of the given rolling stand.