棒材轧制轧件出口断面形状预测及平均轧辊半径的新计算模型

对圆—椭圆—圆孔型轧制合金钢,提出了接触边界临界点的概念,建立了出口断面形状预测模型,推导出临界点的解和新的等效接触断面面积公式,给出了计算平均轧辊半径的新模型。为验证新模型,完成了棒材轧制试验,并且利用刚塑性有限元法对轧制过程进行了模拟。将不同模型得到的理论结果与实验值和模拟值作比较,证明新模型具有很高的精度,因此可以用于精轧孔型设计和轧制工艺参数的设定。

A new analytical model for the calculation of mean roll radius in round-oval-round alloy bar rolling

In alloy bar rolling by Round-Oval-Round pass sequence ,the surface profile of outgoing workpiece has been predicted firstly after getting the maximum spread,then the critical point has been determined.Furthermore,the formula of the equivalent contact section area has been proposed and the mean roll radius has been calculated.The validity of the new model has been examined by the bar rolling experiment and the rigid-plastic FEM simulation.Compared with the existing models,the mean roll radius obtained by the new analytical model approaches the experimental data more closer than other models.So,it can be used as an available reference in practice and the theoretical derivation.