变截面零件辊锻过程数值模拟优化

Numerical simulation optimization of section changed part rolling technology

采用美国MARC公司的MSC/superform软件对叶片辊轧工艺进行了数值模拟。模拟建立两种有限元模型———对称模型和非对称模型,在两种模型下分别分析了坯料与轧辊之间的摩擦系数对中性角的影响,得出中性角随摩擦系数增大而增大,前滑区变形金属随之增多。反之,摩擦系数过小影响坯料的正常咬入,出现打滑现象。模拟结果显示摩擦系数取0.3为最佳选择。在不同模拟模型下不同型槽内变形区金属的流动情况不同。非对称型槽成形的工件由于上下表面金属流动速度不同,出现弯曲现象;对称型槽成形的工件较平直。因此,为保证叶片的成形质量,设计选用对称型槽形式。通过数值模拟优化设计工艺参数,为叶片辊轧工艺的制定提供依据。

This paper introduces the numerical simulations of the blade rolling technology by MSC/superform of American MARC Co. , in which two kinds of finite element models-symmetrical model and asymmetrical model are set up. By analyzing the impact on neutral angle friction coefficient between the billets and roll under two kinds of models, it is found that the neutral angle increases with the friction coefficient and the deformation zone metal increases in the forward slip zone. On the contrary, if the friction coefficient is too small it will affect the normal billet grip, appearing the skidding phenomenon. The simulation result shows that the friction coefficient of 0. 3 is the best. The deformation zone metal flow conditions are different in the different troughs under different simulation models. The workpiece formed by the asymmetric trough appears the bending phenomenon because of the different flow rates at the upper and lower surface metal. The workpiece formed by the symmetrical trough is relatively straight. So, it is better to choose the symmetrical trough form. This paper provides the references for establishing the blade rolling technology by optimizing the design parameters.