ADAPTIVE TECHNOLOGY FOR THICKNESS CONTROL OF FINISHER SET-UP ON HOT STRIP MILL

The improvement of accuracy of head-end strip thickness is required strongly these days. But generally speaking, it is very difficult to maintain accurately under the production of small-lot orders for many different types of products. As one of the positive countermeasures to these difficulties, on-line adaptive methods has been developed at Yawata's hot strip mill. The main idea is based on improvement of prediction accuracy of rolling forces, by means of the forward slip measuring system, in order to estimate coefficient of friction and deformation resistance independently. And further correction method has been introduced employing with fuzzy theory which is a dynamic gap control by finding a certain relationship between predicted rolling force and measured one. We obtained satisfactory results and believe these approach is applicable for a gauge control method under increasingly diversified production style.