| 摘要 |
<p>PURPOSE:To improve the control accuracy by controlling plate crowns by setting the initial control amount of the crowns before the start of measurement of the crowns and controlling the crowns based on the measured value of the crowns after the start of the measurement. CONSTITUTION:The respective bottoms of stands 2-4 of a hot tandem rolling mill 1 are provided with load cells 11 and both side and center parts plate thickness gages 14 and 15 are installed in the outlet side of the stand 4, respectively. Crown control is performed by setting heat crown prediction values and correcting bending forces based on rolling load variation for the duration from the time when a hot rolled coil winds around a tension reel 6 to the time when the plate thickness gage 14 performs the 2nd scanning, that is, before the start of measurement of plate crowns and the crown control is also performed based on plate crown measured values and rolling load variation after the start of the measurement of plate crowns. Thus, the plate crowns are accurately controlled throughout the entire length of the hot rolled coil. Therefore, the control accuracy is improved.</p> |
