动态修正轧机弹跳值提高热轧带钢头尾厚度精度

Improvement of Thickness Accuracy of Hot Strip at the Ends by Dynamical Modification of Mill Stretch

为了得到高精度的辊缝设定值，分析了某钢铁公司热连轧厂轧机弹性方程，找出更接近实际的轧机弹性曲线，以便在假定带钢塑性系数为常数的条件下，在线动态给出带钢穿带过程中轧机弹跳值修正量。结果表明：一段轧机弹跳回归模型精度比二段轧机弹跳回归模型高一个数量级。通过动态修正轧机弹跳方程，消除了辊缝设定模型中的刚度补偿系数误差，可以提高热轧带钢头尾部厚度精度。

In order to set roll gap with high accuracy and find a better curve for describing mill stretch, the mill stretch equation of Hot Strip Mill of Benxi Iron and Steel Co. has been analysed. Base on the assumption of constant strip stiffness, the mill stretch was dynamically modified on line during rolling. The results show that the precision of the one part model on the mill stretch is ten times higher than that of the two part model. By the modification of the mill stretch, the compensation constant error of the mill stiffness in the set up model for roll gap was eliminated, and the thickness accuracy of hot strip at the ends could be improved.