中文摘要：

基于刚粘塑性有限元理论,采用DEFORM-3D有限元商业软件,对3种不同焊合室高度下的薄壁多孔口琴管挤压过程进行数值模拟。重点研究了不同焊合室高度对金属的流动规律、型材的出口流速均方差、挤压力、焊合压力,以及金属应变场的影响规律,从而为合理的设计模具提供了有效的理论指导。

英文摘要：

In this study, according to the rigid-viscoplasticity finite element method, the porthole die extrusion process of an aluminum harmonica-shaped tube in the welding chambers with different heights was simulated using Deform-3D commercial software. The behavior of metal flow, mean square deviation of the velocity field, extruding force, welding pressure, effective strain and effective stress of the deformation body in the chambers with different heights were studied in detailed. The simulation results provide theoretical reference for mould design and selection of technological parameters.