棒材轧制时平均轧辊半径的新计算模型

A NEW ANALYTICAL MODEL FOR THE CALCULATION OF MEAN ROLL RADIUS IN BAR ROLLING

在圆-椭圆-圆孔型中轧制合金钢棒材时,提出了接触边界临界点的概念,并且推导出了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。为了验证新模型,进行了棒材轧制试验并且利用三维刚塑性有限元法对轧制过程进行了模拟。把不同模型得到的理论结果与实验值和模拟值作了比较后证明新模型具有很高的精度,因此可以作为轧制理论和实践的重要参考。

The concept ＂critical point on the contact boundary＂ was proposed for the roundoval-round rod （or bar） rolling process. Furthermore, the coordinates of the critical point could be solved, the new formula for calculating the equivalent contact section area was represented and the mean roll radius could be calculated by the new analytical model. The validity of the new model was examined by the bar rolling experiment and the 3D rigid-plastic FEM simulation. Compared with the existing models, the mean roll radius obtained by the new analytical model approached the experiment data more closely than other models. So, it could be used as an available reference in practice and the theoretical derivation.