PURPOSE: To prevent the opeational trouble and the debasement of accuracy of thickness, by controlling the rotational frequency of the mill rolls depending on the output signal of the tension detector installed between the hot rolling mills, and by varying the control gain according to the temperature of rolled material.
CONSTITUTION: When the rolling is started, the temperature arithmetic unit A always operates and delivers the temperature of the rolled material M as the output, and besides, the value of output of the tension detector D1 is converted and corrected by the temperature corrector C1, and is inputted to the tension regulator TR1. The tension regulator TR1 receives the temperature O1 of the rolled material and decides the control gain, and lets the speed regulator SR1 to deliver the corrected speed according to the deviation in the tension. This opration is continued until the rolling work finishes over all stands.
TANIFUJI SHINYA
KAWANO SHIGEYOSHI
