| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To successively conduct a rolling operation by using a manufacturing device of a hot-rolled steel sheet provided with a hot-rolling mill, a transportation table, a plurality of water-cooling devices arranged in a transportation direction of the steel sheet, and winding devices, while properly and quickly correcting and setting all target temperatures of the water-cooling devices even if a rolling speed at hot rolling is changed in the middle of the hot rolling. <P>SOLUTION: A setting range of opening degree of water-volume adjusting valves in all the plurality of water-cooling devices 5a to 5c for setting a winding temperature of the steel sheet 1 as a target value is calculated on the basis of a rolling speed after the change and a measured value of a temperature of the steel sheet 1 at the input side of the water-cooling device 5a located at the most upstream side among the water-cooling devices 5a to 5c. Furthermore, the opening degree of the water-volume adjusting valves of at least one or more water-cooling devices are corrected and set in a prescribed range on the basis of a passing speed after the change and a measured value of a temperature of the steel sheet 1 at input sides of one or more water-cooling devices 5b, 5c. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
