METHOD FOR CONTROLLING SHEET THICKNESS IN ROLLING MILL

摘要

PURPOSE:To accurately equalize a sheet thickness of a finally rolled product with a target sheet thickness by measuring a sheet thickness under a condition in which a temp. of a rolled stock drops to a temp. not higher than an allowable temp. and correcting a sheet thickness controlling target value for a succeeding rolled stock. CONSTITUTION:A sheet thickness value is measured by a sheet thickness gage 38 at the time when a temp. of a rolled stock 16 rolled by a rolling mill 10 drops to a temp. not higher than an allowable temp. previously decided under a non-rolled situation. That measurement signal is sent to a correction control target value arithmetic unit 40. A signal representing a present sheet thickness control target value is sent from a sheet thickness control target value setter 24 to the unit 40 and a corrective sheet thickness control target value is found based on both the above signal values. The above target value is set as a sheet thickness control target value by the setter 24 for rolling of a succeeding rolled stock. In rolling, a roll gap between rolls 22, 22 is adjusted and controlled so that a sheet thickness value measured by a sheet thickness gage 20 of the mill 10 equals to the corrected target value.