Working strip material

B - Operations – Transporting – 21 – B

Patent

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341/42

B21B 37/00 (2006.01) B21B 37/32 (2006.01) B21B 37/38 (2006.01)

Patent

CA 1173138

ABSTRACT A method of controlling one stand of a mill for rolling strip material, the mill having upper and lower back-up rolls and a pair of work rolls disposed between the back-up rolls, first and second screw means for respectively controlling movement of the ends of one of the back-up rolls and first and second jack means for respectively applying forces to each of the ends of the work rolls and a shape sensor having outputs from which the stress distribution across the width of the rolled strip is determined, comprising separately analysing the affect upon the shape of the strip of the operation of each screw means and each jack means and deriving four mathematical expressions, each including a control parameter, respectively representative of such operations determining an error distribution E(x) as the difference between said stress distribution and a desired stress distribution obtaining a correction of stress distribution C(x) by determining an optimum value for each of said control parameters such that a functional of the distribution E(x) - C(x) is minimised and separately controlling operation of each of said screws and jacks in accordance with said control parameters.

401531

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