凸模锥角对三柱轴式万向节径向冷挤压成形的影响

Influences of taper angle of punch on radial cold extrusion process of three-pillar universal joint pin

通过有限元数值分析,比较了不同凸模形状对三柱轴式万向节在径向冷挤压过程中金属流动、挤压力以及凸模内部等效应力分布等方面的影响。研究表明,合适的凸模锥角形状有利于挤压过程金属稳定流动,有效地遏制终了阶段载荷的急剧增加,降低了凸模的最大等效应力水平。工艺试验表明,采用30°的斜锥模能够加工出合格的挤压件。

The influences of various punch shapes on radial cold extrusion process of the three-pillar universal joint pin were analyzed by FEM modeling and physical experiments. The metal flow, extrusion force and punch equivalent stress distribution were analyzed through the results of simulation and physical experiments. The investigation shows that the optimized taper angle of the punch was beneficial for the metal to fill the cavity, and it can suppress the rapid increase of forming load during the end stage and decrease the magnitude of the equivalent stress. The technological test shows that the qualified extrusion is obtained using oblique conedie with taper angle of 30°.