超高强钢冷轧过程轧制力计算的改进模型

Improved model for calculating rolling load of ultra-high strength steel in cold rolling process

为了解决采用圆弧模型计算超高强钢冷轧过程轧制变形区轧辊压扁曲线误差较大的问题,充分考虑到超高强钢的轧制特点,通过分析不同压扁半径下轧辊压扁曲线的变化规律,构造出新型轧辊压扁曲线函数模型,给出了该函数中轧制变形区接触弧长特性参数与轧辊压扁曲线特性参数的求解方法。基于此,根据弹塑性理论中的变形与应力关系,推导了入口弹性变形区、塑性压下变形区以及出口弹性变形区单位轧制压力分布计算过程,建立了超高强钢冷轧过程总轧制力计算模型。并将其推广应用到某钢厂2030冷连轧机组,验证了该模型的计算准确度。结果表明,超高强钢冷轧过程轧辊压扁曲线用二次函数表示,更能准确反映轧辊压扁状态,其计算结果与实际值具有较高的吻合度。同时,为冷连轧机组生产超高强钢产品极限轧制能力的评估与轧制规程的制定提供了理论依据。

In order to solve the problem of large error in calculation of roll flattening curve in rolling deformation zone of ultra-high strength steel during cold rolling,fully considering the rolling characteristics of ultra-high strength steel,a new function model of roll flattening curve was constructed by analyzing the variation of roll flattening curve under different flattening radius,and the solution method of characteristic parameters of contact arc length and roll flattening curve in the function was given.Based on this,according to the relationship between deformation and stress in elastic-plastic theory,the calculation process of unit rolling pressure distribution in entrance elastic deformation zone,plastic reduction deformation zone and exit elastic deformation zone was deduced,and the calculation model of total rolling force in cold rolling process of ultra-high strength steel was established.And,the model has been applied to 2030 tandem cold rolling mill of a steel plant to verify the calculation accuracy of the model.The results showed that the roll flattening curve in the cold rolling process of ultra-high strength steel is expressed by quadratic function,which can more accurately reflect the roll flattening state,and the calculated results are in good agreement with the actual values.Meanwhile,it provides a theoretical basis for the evaluation of ultimate rolling capacity and the formulation of rolling schedule of ultra-high strength steel products produced by tandem cold rolling mill.