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对连续挤压生产中产生的弯曲、扭曲等的产品质量问题从模具型腔结构特点上进行了分析 ,提出了以汇合室 -焊合室过渡处金属轴向流速均匀为目标的型腔几何参数优化方案 通过型腔内金属流动规律的模拟实验分析 ,建立了汇合室塑变区的速度场数学模型 ,在此基础上 ,分析了型腔各几何参数对金属流动规律的影响 ,采用正交试验和一维搜索法对型腔几何参数进行了优化 验证实验表示 :所建立的速度场数学模型正确 ,优化后的模具型腔可满足生产要求 ,为连续挤压模具的设计提供了一定的理论依据
The quality problems of products such as bending and twisting in continuous extrusion are analyzed from the characteristics of the mold cavity structure. The geometric parameters of the cavity which are aimed at the uniform axial velocity of the metal in the transition area between the convergence chamber and the welding chamber are proposed Through the simulation analysis of the metal flow in the cavity, the optimization scheme was established and the velocity field mathematical model of the plastic deformation zone in the confluence chamber was established. On the basis of this, the influence of the geometric parameters of the cavity on the metal flow was analyzed. And one-dimensional search method to optimize the geometry parameters of the cavity. Experiments show that the established mathematical model of the velocity field is correct, the optimized mold cavity can meet the production requirements, and provides a theoretical basis for the design of the continuous extrusion die