Stand between tension control method and device for a hot steel strip continuous finishing mill

摘要

PURPOSE:To control tensions with the high accuracy in accordance with strip passing states by controlling a strip tension by using both a tension detector between stands and a looperless controller. CONSTITUTION:A detector for tensions of a strip S between finishing rolling mills Fi and F=+1 consists of a mechanical system containing such as a cylinder 2 of a tension detecting roll 1 and a load cell 3 supporting the cylinder 2. A tension control system jointly consists of the above tension detector and a looperless controller which controls tensions based on a rolling torque and rolling reaction force at the mills Fi and Fi+1. When a strip is passed, the roll 1 is lifted higher than the pass line and a tension is directly detected by the load cell 3 and a computer 5 operates and controls tensions between mills. When sledging or runout occurs, the roll is downed below the pass line and the looperless controller using a computer 20 operates and controls tensions based on data such as a rolling torque and a rolling reaction force of the mills Fi and Fi+1.