METHOD FOR PREDICTING DEFORMATION RESISTANCE OF ROLLING MATERIAL IN TANDEM COLD ROLLING MILL, AND TANDEM COLD ROLLING METHOD

摘要

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