JPS55130317A - Controlling method for tension - Google Patents

Abstract

PURPOSE:To accurately control the interstand tension, by operating the interstand tension on the basis of the torque arm corrected depending on the difference between the predicted value and actually measured value of the torque arm. CONSTITUTION:Before the rolled material 1 is bitten into the (i+1)-th stand, the reference torque arm is operated and memorized by the actually measured torque arm arithmetic memory unit 6. The predicted torque arm is operated by the predicted torque arm arithmetic unit 4 and is memorized by the memory unit 5. From these values, the torque arm ai during the rolling work is operated by the torque arm arithmetic unit 7. On the other hand, depending on the actually measured rolling load Pi, the feed side sheet thickness Hi, and the delivery side sheet thickness hi, the arithmetic units 8 and 9 respectively operate the back torque arm bi and the front torque arm Gi during the rolling work. Depending on thus operated torque arm ai, back and front tension torque arms bi, Gi, the actually measured rolling load Pi, rolling torque Gi, and previously operated back tension Ti-1, the desired front tension Ti is operated by the front tension arithmetic unit 10.