CONTROLLER FOR COILING TEMPERATURE OF STRIP ROLLED BY THICKNESS CHANGEABLE STRIP MILL

摘要

PURPOSE:To stabilize the quality of a product, by ensuring a aim mechanical property overall the length of the thickness changed product, and by positively controlling the coiling temperature, at carrying out a finish rolling work accompanying a thickness changing process. CONSTITUTION:The adjustment for the screw position and the adjustment for the rolling speed, for changing the thickness, are computed by the thickness changing process computer 1, and are inputted to the screw position controller 5 and the speed controller 4. At the same time, the rolling speed detector 6 detects the rolling speed V of the final finishing stand; this rolling speed V is corrected by multiplying the forward slip phi, and is integrated; the result of this integration is compared with the distance Ln between each of the water spray sections and the roll center of the final finishing stand, as shown by the formula. Hereby, the arrival of strip at each section of the hot run table is successively tracked in order to determine the timing of starting the adjustment of the sprayed water rate. Besides, the adjustment of the sprayed water rate is started just before the thickness change starting point enters the n-th section, and is completed just before the thickness change ending point passes over the n-th section, as shown in the figure.