METHOD FOR CONTROLLING ELONGATION PERCENTAGE IN TEMPER ROLLING MILL

摘要

PROBLEM TO BE SOLVED: To enable steady elongation-percentage control by reducing the variation of the elongation percentage at accelerating and decelerating and when a welding point and changing point of rolling conditions through a rolling mill. SOLUTION: When the elongation percentage after rolling is within a set range, tension is fixed and he elongation-percentage control by the rolling load of a temper rolling mill is performed. When the elongation percentage is deviated from the set range, the target rolling load of the temper rolling mill is changed in accordance with deviation from the target value of the elongation percentage and also the elongation-percentage control is performed by changing the speed of a bridle roll.