JPS54123555A - Hot rolling method for hot strip - Google Patents

Abstract

PURPOSE:To restrict the fluctuation of breadth of strip after the finish rolling to nearly zero, by forecasting the breadth of strip after the finish rolling through measurement of the breadth and temperature of the rough rolled material for every specified length, and by operating the deviation from the aim breadth, and by setting the tension between each finishing stand. CONSTITUTION:The breadth and temperature of the strip are measured at the position P for every specified length over entire length of the rolled material 4 on the exit side of the roughing mill 1, and are inputted to the arithmetic memory unit 5 for the set tension value. Information of the material information setter 6 is inputted to the draft schedule setter 7 and the arithmetic memory unit 5, and the result for the rolling pass schedule is inputted to the arithmetic memory unit 5. This unit 5 forecasts the breadth at the moment that each measuring point arrives at the exit side of the finishing mill, and operates the deviation from the aim value, and operates and memorizes the amount of variation of the interstand tension set value at the timing of rolling by each stand. The unit 5 is inputted with the rolling output and the detected value of rolling speed at each stand, and operates the timing of arrival of each measuring poing of the rolled material 4 at each stand, and delivers the result to each of the interstand tension controllers 16-18; hereby, the control of breadth of strip is carried out.