| 摘要 |
<p>PURPOSE: To improve thickness precision, in controlling the thickness of a rolling stock in a hot tandem rolling mill, by suppressing a steep tension change at the tip end of a metallic material. CONSTITUTION: In a thickness control method in a hot tandem rolling mill that is provided with plural rolling stands 1 and plural devices 3 for controlling tension between stands; after a rolling stock 4 passes between arbitrary stands 1, a tension control 24 is performed using as a target tension 23 the actual tension value at the point of time when a corresponding device 3 for controlling tension between stands starts controlling; after a prescribed time is elapsed, the target tension 23 between the stands is changed so that it is gradually changed into a value different from the target; and a change at the tip end of the rolling stock is suppressed which is due to a change in tension at the tip end of the rolling stock.</p> |
