METHOD FOR PREDICTING DEFORMATION RESISTANCE OF ROLLING MATERIAL AND FRICTIONAL COEFFICIENT BETWEEN ROLL AND ROLLING MATERIAL IN TANDEM COLD ROLLING MILL, AND TANDEM COLD ROLLING METHOD

摘要

PROBLEM TO BE SOLVED: To make it possible to set a roll gap even when a plate thickness meter is not arranged between successively arranged two rolling mills.;SOLUTION: First, the deformation resistance and the frictional coefficient between the roll and the rolling material in rolling the rolling material by means of successively arranged two rolling mills is predicted for every rolling mill by calculation using a prediction formula. Next, the actual deformation resistance and the actual frictional coefficient are calculated backward based on the actual values of the tension on the input and output sides of the respective rolling mills, the actual values of the rolling load and the forward slip ratio, the actual values of the plate thickness at the inlet side of the upstream side rolling mill and the outlet side of the downstream side rolling mill, the assumed value of the plate thickness of the rolling material between both rolling mills. Next, a deformation resistance learning factor and a friction coefficient learning factor are defined as the ratio of the actual deformation resistance and actual frictional coefficient to the predicted deformation resistance and frictional coefficient. Finally, the deformation resistance and the frictional coefficient for the same kind of the rolling material at the next rolling time are predicted as the predicted values multiplied by the deformation resistance learning factor and the friction coefficient learning factor. In this case, the plate thickness between the successively arranged two rolling mills is determined such that the deformation resistance learning factor in the successively arranged two rolling mills converges within a certain error range.;COPYRIGHT: (C)2006,JPO&NCIPI