CONTROLLER FOR CONTINUOUS ROLLING MILL

摘要

PURPOSE:To provide a titled device which improves the dimensional accuracy of rolled materials by controlling the draft position of rolling mills in accordance with the detected value of the height size of the rolled material on the outlet side of the rolling mills and controlling the rolling reduction of the rolling mill of the previous stage for the purpose of compensating the change in the breadth size in accordance with said control. CONSTITUTION:A size detector 6 is provided on the outlet side of the #i stand rolling mill 4 of continuous rolling mills having calibers to detect the size (hi) in the height direction of a rolled material 5. The deviation DELTAhi between said (hi) and a reference size hREF is multiplied by a prescribed gain in a control gain device 17. In accordance with the resultant control gain, a PI device 18 controls the draft position of the mill 4 via a thyristor device 14 so as to make the above-mentioned deviation zero. Then a compensating device 19 receives the control signal of the device 18 as its input and controls the draft position of the #i-1 stand rolling mill 3 so as to compensate the fluctuations in the breadth size in accordance with the change in the draft position of the mill 4 by said control signal.