模桥结构对铝型材分流挤压纵向焊缝焊合性能的影响
Effects of Die Leg on Welding Ability of Longitudinal Welds During Porthole Die Extrusion of Aluminum Profile
刘 健， 林高用， 冯 迪， 邹艳明
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作者单位：中南大学 材料科学与工程学院, 有色金属材料科学与工程教育部重点实验室，湖南 长沙 410083
中文关键字：分流组合模；纵向焊缝；模桥；K参数
英文关键字： porthole die; longitudinal weld; die leg; K criteria
中文摘要：基于刚粘塑性理论，采用Deform-3D有限元软件，对铝型材分流挤压的焊合过程进行了数值模拟。分析了不同分流模模桥结构下焊合面上接触压力、流变应力和速度场的分布及其变化。模拟分析表明，随着模桥下端尺寸d的减小，焊合区域有效焊合路径L增长，静水压力升高，等效应力降低；利用Donati提出的K参数法来判断模桥结构对焊合质量的影响，表明，模桥下端尺寸d越小，分流的金属焊合效果越好。
英文摘要：According to the rigid-visco-plasticity finite element method, the welding process of aluminum profile porthole die extrusion was simulated using Deform-3D software. The distributions and changes of the contact pressure, flow stress and velocity field on the welding plane were analyzed. The results show that effective welding path length L and contact pressure increase and effective stress decreases with the decreasing of back leg dimension d. According to Donati's K criteria, the effect of die leg on the welding quality is performed, and it turns out that the shorter the back leg dimension d is, the better the welding quality is.