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中文摘要：
连续挤压扩展成形是一种先进的铜母线制造方法，而分流模结构是影响成形的重要因素。根据连续挤压扩展成形特点，建立了基于DEFDRM-3D刚塑性有限元模型，通过对铜母线连续挤压过程的数值模拟，分析了不同分流模结构下的金属流动规律、流速均方差。结果表明，分流模结构为无过渡面梯形时，金属流动速度差最小，流速均方差为3．11，变形最均匀。通过试验研究验证了数值模拟结果，为连续挤压扩展成形模具优化设计提供了重要的理论指导。
英文摘要：
Continuous extrusion extending deforming is an advanced forming process for manufacturing copper bus-bar while porthole structure is an important factor affecting deformation. According to the characteristics of the forming process, the model of rigid-plastic FEM based on DEFORM-3D is established and the numerical simulation of continuous extrusion extending forming process of the copper bus-bar is carried out. The metal flow regularity and the mean-square deviation of velocity with different structure of porthole are analyzed. The results show that using the echelon form of porthole without transition plane, the deformation is the most homogeneous and the variance of flow velocity is the minimum with mean-square deviation of velocity as 3. 11. The simulation results verified by experiment could make reference for optimization design of port hole structure of the continuous extrusion extending forming.
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