PLATE WIDTH CONTROL METHOD FOR HOT STRIP MILL

摘要

PURPOSE:To improve the accuracy in a length from the top of a rolled stock and to reduce variations in the plate width of the stock by measuring slip and grip ratios in an online mode using a detector for the stock top end and correcting calculated slip and grip ratio values. CONSTITUTION:Both the distance LM between a front stage horizontal rolling mill and a detector for the rolled stock top end and the distance LR between the top end bitten by the front rolling mill and the detector are calculated by equation I. A slip ratio ffor is given by equation II based on the distance LM and LR. The distance L3 which the rolled stock advances for a given period of time after the rolling stock is bitten by a back stage rolling mill is obtained by substituting the slip ratio ffor of equation II into f in equation I. A grip ratio fbac is obtained by equation III based on the L3 and the advancing distance L1 of the rolled stock obtained by equation I. The quality of rolled stocks is improved by conduct of the plate width control for a hot strip mill in a feedforward system using the corrected slip and grip ratios.