大断面收缩率TC4轴类零件精密楔横轧数值模拟

Numerical simulation on precise cross wedge rolling of TC4 shaft parts with large area reduction

本文对某断面收缩率高达82%的TC4轴类件楔横轧高精度成形工艺进行了研究。首先进行板式楔横轧模具设计,并采用有限元软件Deform-3D进行热力耦合仿真模拟对设计方案进行优化,分析了轧件成形过程中的温度变化、应力-应变分布、损伤演变等结果。基于有限元模拟结果统计分析了不同温度下的轧件尺寸。结果表明,在750~900℃,随着轧制温度升高,变形区直径随之增大。最后对IM500板式楔横轧机进行了轧制实验,实验结果与模拟结果较为吻合。因此大断面收缩率TC4的楔横轧高精度成形工艺是可行的,轧制温度应不低于850℃。

The precise cross wedge rolling process of a TC4 alloy shaft with the large area reduction more than 82%was investigated in this paper.First,flat cross wedge rolling dies were designed.Then the cross wedge rolling processes were optimized by using the thermal-mechanical coupling simulation with Deform-3 D software.Not only the distribution of stress,strain and temperature,but also the damage evolution was discussed.The feature diameters of the rolled parts at different temperature were statistically analyzed based on the simulation results.It showed that the diameter of deformation zone increases with the rolling temperature increasing between 750℃ to 900℃.Finally,cross wedge rolling experiments were carried out with a self-made IM500 flat cross wedge rolling mill.The experimental results were in good agreement with the simulation ones.Therefore,the high-precision cross wedge rolling forming process of TC4 parts with large area reduction is feasible,and the rolling temperature shall be above 850℃.