| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a control method of width for enhancing the accuracy of the width of a hot-rolled steel sheet and improving yield. SOLUTION: In the control method for rolling by which, after rolling a steel sheet in the width direction with a vertical rolling mill, the width on the downstream side in the rolling direction of a horizontal rolling mill is controlled by a method for rolling the steel sheet in the thickness direction with the horizontal rolling mill, on the basis of the deviation between the measured value of width with a width meter installed on the downstream side in the rolling direction of the horizontal rolling mill and predictively calculated value and the deviation between the measured value of rolling load in the vertical rolling mill and the predictively calculated value, by separating width deviation caused by prediction error of load in the vertical rolling mill from width deviation generated caused by the change of a rolling state accompanying the temperature change of a rolling mill, roll wear or the like, for example, performing learning and correcting the opening degree between rolls, the accuracy of width is improved.</p> |
