PLATE THICKNESS CONTROL METHOD

摘要

PURPOSE:To improve the plate thickness accuracy by performing an independent and automatic thickness control at each stand, comparing each draft position deviation amount of adjacent stands, and eliminating a draft imbalance between the stands based on the above comparison. CONSTITUTION:Gage meter type automatic plate thickness controls at adjacent stands (i-1) and (i) are prepared, respectively. Then, draft position deviation amounts DELTASi and DELTASi-1 of the respective adjacent stands are compared in addition to the above independent control. In other words, a plate thickness deviation at the former stand is varied when a biaslike draft correction amount being additional to an automatic draft control amount is added to the deviation amount DELTASi-1. In that time, the deviation is varied so that a relative ratio between the deviation amounts DELTASi and DELTASi-1 reaches a constant value. In that way, the plate thickness accuracy and the plate flatness are remarkably improved because a draft imbalance between adjacent stands is eliminated.