Thickness controlling method and rigidity monitoring method for rolling mill

Abstract

The present disclosure provides a thickness controlling method for a rolling mill that makes it possible to calculate an appropriate rolling mill gap correction amount on the basis of a roll force change amount between a preceding material and a present material, and to thus improve the precision level for thicknesses. The thickness controlling method for the rolling mill includes a step of using a regression model to recursively approximate a relationship between the roll force change amount between the preceding material and the present material and a gap error change amount of the rolling mill, and predicting a gap error in a rolling of the present material on the basis of the regression model, the preceding material being a rolled coil rolled by the rolling mill immediately prior, and the present material being another rolled coil to be rolled following the preceding material, a step of correcting a gap setting amount in the rolling of the present material, on a basis of a value of the predicted gap error, and a step of updating a regression coefficient of the regression model, on a basis of an actual roll force and an actual gap error change amount obtained from the rolling of the present material.

Dependencies are inferred from the claim text.