HIGH SPEED COLD ROLLING METHOD

PURPOSE:To prevent heat scratching and chattering by measuring the surface temps. of work rolls during rolling actually, and maintaining the surface temps. of the rolls in an optimum temp. range in accordance with these. CONSTITUTION:In tandem rolling mills or the like, a work roll surface thermometer 20 is installed to, for example, a No.6 stand to measure the surface temp. of said roll. On the other hand, the optimum temps. determined by products and rolling speeds are set in an optimum temp. setter 21. The set temp. and the actually measured temp. are fed to a differential amplifier 24, by which the deviation thereof is determined. This deviation is inputted to an amplifier 22 which outputs the proportional signal corresponding to the deviation input. The proportional signal is converted with a coolant flow rate with a converter 23, which outputs a command signal for the correcting operation of valve opening of a pressure control valve 19. According to this signal, the coolant flow rate to the roll is controlled with coolant flowmeters 8-13, and roll coolant pressure control valves 14-19, whereby the prescribed surface temp. of the work rolls is maintained.