METHOD FOR CONTROLLING ROLLING IN SHEET ROLLING MILL

摘要

PURPOSE:To control sheet crown and shape without time delay and with high accuracy by calculating a required amount of change of load of each divided back-up roll of a rolling mill and operating a width-direction thickness distribution/shape controller of the rolling mill taking this required amount of change as the target. CONSTITUTION:In at least either one of upper and lower roll assemblies, a work roll 1 is supported with divided back-up rolls 2A-3D which are divided in three divisions and more in the axial direction. Load detectors 5, 6 are respectively independently arranged on individual divided back-up rolls. Further the width-direction thickness distribution/shape controller for a rolled stock and sheet shape detector 7 are provided behind the sheet mill. The difference between a sheet shape detected with the sheet shape detector 7 behind the rolling mill and the desired sheet shape is calculated. The required amount of change of width-direction distribution of the rolling load that is exerted between a rolled stock and the work roll for dissolving this difference is calculated and further the required amount of change of the load of each divided back-up roll 2A-3D of the rolling mill for achieving the required amount of change of this rolling load distribution is calculated.