CVC轧机辊型设计原理和控制模型的探讨

CVC技术对于板带的断面形状及板形的控制是非常有效的手段,而开发这一技术的关键软件是CVC辊型的设计原理及轧机的控制模型。 本文阐述了辊型的设计原理,指出CVC的S形辊型曲线由以下三部分构成,1.标准轧制状态下承载辊型的三次基本曲线;2.补偿标准轧制状态下轧辊变形的二次曲线;3.补偿基本曲线锥度的三次曲线。根据这一原理推出轧辊的凸度值是带钢宽度和横移距离的函数。 另外,还以轧辊的弹性变形理论出发导出了带钢凸度、宽度及轧制压力之间的关系。基于导出的关系,便可进行轧辊横移距离的设定,以补偿由轧件宽度及轧制压力的扰动所引起的轧件凸度变化,从而达到控制效果。

THE PRINCIPLE FOR DESIGNING CVC-ROLL PROFILE AND THE DISCUSSION FOR CONTROL MODEL

CVC technology is very efficient for controlling strip shape and profile. The main softwares for developing CVC technology are the principle for designing CVC roll profile and the control model of CVC mills.The principle is presented in this paper. It is suggested that the S-shape of CVC rolls is composed of three components. The first one is a cubic basic curve, which can be defined as the loaded roll profile in the normal rolling condition. The second component is a quadratic curve which is used to compensate the roll deformation in the normal rolling condition. The third component is a cubic curve which is used to compensate the cone caused by the basic curve. According to this principle, the regulation value of roll crown is a function of strip width and shifting distance.In additin. the relationship among the strip crown, strip width and rolling load is derived from the theory of roll elastic deformation. Based upon the relationship derived above the work roll shifting distance can be determined, which can be used to compensate the variation of strip crown caused bythe disturbance of strip width and rolling load. Thus, the expected control effect is obtained.