PLATE THICKNESS CONTROL DEVICE FOR ROLLING MILL

摘要

PURPOSE:To enable the correct plate thickness control having high control gain by taking into consideration the transfer time of the stock to be rolled upto the plate thickness detector from rolling mill and by taking up the detected signal transmitted from each detector in the same timing into the arithmetic circuit. CONSTITUTION:The finite difference DELTASA in the rolling reduction position SA of a rolling reduction device 3 and reference rolling reduction position SAO and the finite difference DELTAPA in the rolling load PA detected by a rolling load detector 14 and reference rolling load PAO are stored respectively to data delay devices 15, 16. The stock 1 to be rolled which was subjected to a caliber rolling by a rolling roll 2 is detected by a plate thickness detector 11 after the transfer time (r) and the thickness error DELTAhA in the detected thickness hA and the target value h* is inputted into an arithmetic circuit 17. In this case the finite difference DELTASA, DELTAPA are inputted into the arithmetic circuit 17 is the same timing by the data delay devices 15, 16. The arithmetic circuit 17 calculates a mill constant K and reference rolling reduction position error DELTAS*M by the prescribed equation from the uptake data signal. the finite difference DELTAPA is corrected with the feed back of the mill constant K to the correction circuit and the rolling reduction position is corrected with the feedback of the reference rolling reduction position error DELTAS*M to the rolling reduction device 3.