某铝合金T型材双模孔反向挤压变形分析及模孔位置优化

Deformation analysis and mold hole position optimization on double mold hole reverse extrusion for aluminum alloy T profile

双模孔反向挤压过程中,模孔布局对挤压型材的变形及质量具有重要影响。对某铝合金T型材双模孔反向挤压过程进行了数值模拟,分析了不同模孔布局对挤压型材变形及其均匀性的影响规律,获得了平模挤压两模孔的合理布局方案。并针对平模挤压两模孔之间存在的等效应变集中问题,提出了一种在平模挤压两模孔之间设置劈料台的方法,对比分析了设置劈料台前后型材的等效应变、温度分布和流速分布等。结果表明,模孔布局对挤压型材的等效应变分布的影响明显,合理的模孔布局可有效提高型材的变形均匀性,具有劈料台的挤压模具能够显著改善型材的等效应变集中问题。

During the process of reverse extrusion with double mold holes,the layout of mold hole has an important impact on the deformation and quality of extruded profiles.Therefore,the numerical simulation of reverse extrusion process with double mold holes for aluminum alloy T profile was carried out,and the influence laws of different mold hole layouts on the deformation and its uniformity of extruded profile were analyzed to obtain a reasonable layout plan for double mold holes in flat mold extrusion.Then,aiming at the problem of equivalent strain concentration between the double mold holes in the flat mold extrusion,a method of setting a cleaver divider between the double mold holes in the flat die extrusion was proposed,and the equivalent strain,temperature distribution and velocity distribution of profiles before and after setting the cleaver divider were compared and analyzed.The results show that the mold hole layout has a significant effect on the equivalent strain distribution of extruded profile.Thus,a reasonable mold hole layout can effectively improve the deformation uniformity of profile,and the extrusion mold with cleaver divider can significantly improve the problem of equivalent strain concentration of profile.