METHOD FOR SETTING ROLL GAP OF FINISHING MILL OF HOT STRIP MILL

摘要

PURPOSE:To obtain the target thickness on the outlet side of the final stand and also to secure the good passableness of strip by reflecting the relationship between the actual roll gap of the last rolled stock and the actual thickness on the outlet side of the final stand on the setting of roll gap of the present rolled stock. CONSTITUTION:The actual roll gap of the last rolled stock is separated into the set roll gap before biting the rolled stock and the changing quantity of roll gap until the rolled stock reaches the position for measuring the actual thickness on the outlet side of the final stand after biting the rolled stock. The variable of the thickness on the outlet side of the final stand due to the changing quantity of the roll gap after biting the rolled stock is calculated. The changing quantity of the roll gap after biting the rolled stock is smoothened with each stand and the smoothened changing quantity of the roll gap of each stand with which the variable of the thickness on the outlet side of the above-mentioned final stand is imparted is determined. This changing quantity of the roll gap is added to the set roll gap of each stand before biting the rolled stock and it is used as the roll gap of each stand of the last rolled stock. In this way, the roll gap of each stand can be pertinently set and the good property of passableness of strip can be secured.