分流模挤压非对称断面铝型材有限元数值模拟分析

FEM Simulation of an Al-alloy Profile with Non-symmetrical Cross Section During Porthole Extrusion

采用了一种基于Deform-3D结合Pro/Engineer的对分流模挤压过程中焊合面相互穿透网格进行重构的技术,并对空心型材分流模挤压过程中金属的流动行为、温度场及模芯受力情况进行了模拟分析。结果表明,网格重构技术对于空心型材挤压的数值模拟具有可行性,可实现焊合面与对称面不一致(非流动对称面)空心型材的分流、焊合及成形的挤压全过程的仿真,从而为研究挤压全过程(尤其是焊合过程)的金属流动行为、模具结构的合理性、变形体的温度场分布情况、焊合阶段模具的受力等提供了一种新的计算分析方法。

A mesh-reconstruction technology of welding-plane is introduced based on Deform-3D and Pro/Engineer software. Applying the technology, the metal flowing behaviors, temperature fields and mandrel stress distributions during the whole extrusion processes of two hollow profiles are analyzed. The results show that, the reconstruction technology is effective for simulation the whole extrusion process （including dividing, welding and forming） of hollow profiles with irregular cross section. The mesh-reconstruction technology provides a new method to investigate the metal flowing behavior, die structure optimization, temperature distribution of ingot, die stress during welding stage of porthole extrusion.