| 摘要 |
<p>PURPOSE:To obtain H-shape steels whose web has less height variance by using a universal rolling mill for finish rolling, detecting a web height by a width measuring means in the outlet side, and controlling a vertical roll opening based on the detected value. CONSTITUTION:A roll opening of vertical rolls and an offset (shift) amount S toward the mill outlet side are set to prescribed values based on a rolling schedule. Then, a vertical roll opening correction amount for a deviation between a target web height and a measured web height is calculated by a main arithmetic unit based on a measured value by a web height measuring instrument in the mill outlet side, a temp. of the mill, and a measured vertical roll rolling load. As the result, a correction signal is inputted to a vertical roll drafting device to correct an opening. Together with the correction, a necessary shifting amount of the vertical rolls is calculated by a prescribed formula and shift correction is performed. A width measuring instrument utilizing lasers or an ultrasonic distance measuring equipment, etc., is used as the web height measuring means.</p> |
