热轧中宽带钢凸度控制模型开发与应用

Developing and Application of Crown Control Model for Medium Breadth Hot Rolled Strip

以国内某热轧带钢厂的新建项目为背景,分析了影响热轧中宽带钢凸度的主要因素,介绍了凸度预设定模型、工作辊热凸度和磨损计算模型及凸度和平直度反馈控制模型的主要功能及架构;针对典型产品的轧制过程设计了精轧机组工作辊的正弦辊形曲线.根据某产品轧制过程的工程记录数据,绘制了精轧机组的比例凸度分配曲线,结合多功能仪实测数据分析了模型的控制效果,带钢出口凸度保持在(40±20)μm的比例占带钢全长的100%,平直度为(0±10)I的比例占带钢全长的98%以上.

Taking a certain new built medium breadth hot rolled strip mill as the objection,the principal influencing factors of strip center crown were analyzed.It was presented the predictive model of strip crown,the calculating model of thermal crown and wear and the model of the feedback control for center crown and flatness.In the rolling process of the typical products,the SIN curves of 7-standed work rolls barrel were designed.According to the measured data of strip rolled in site,it was plotted the relative crown profile under the condition of even force distribution and the distribution curve of relative crown of strip in finishing mill.Measured data obtained by multi-functional profile and shape meter showed that 100 percent of the finishing crown of strip was located in the range of（40±20） μm and the flatness of 0 I with the tolerance of ± 10 I was more than 98 percent along strip length.