Patent Document ID: 4125004
Application ID: 05814932
Patent Flag: 1

Claim One:
1. A feed backward gauge control system for a rolling mill having at least one mill stand with an adjustable screwdown for controlling the roll opening thereof through which a sheet metal workpiece is fed during a rolling mill run for reducing the thickness of the workpiece from an input gauge to an output gauge, screwdown adjustment means for adjusting the mill stand screwdown and to thereby adjust the roll opening and workpiece output gauge, means for measuring the output gauge (G.sub.O) of the sheet metal workpiece; and computing means employing a predetermined mill screwdown adjustment model for determining any corrective screwdown adjustment for achieving a desired output gauge using rolling mill running variables consisting essentially of the measured output gauge (G.sub.O) and an unmeasured simulated input gauge (G.sub.CI), the screwdown adjustment means being connected to be operated by the computing means for adjusting the mill screwdown in accordance with said computed corrective screwdown adjustment, and the computing means being operable for adaptively adjusting said simulated input gauge (G.sub.CI) based at least in part on a nominal input gauge (G.sub.NI) of the workpiece and empirically on a plurality of spaced output gauge measurements.