毕业设计铝型材XC 748挤压过程数值模拟.docVIP

铝型材XC 748挤压过程的数值模拟 由于挤压过程中工件的变形程度比较大，造成金属流动剧烈，工模具的消耗较大，材料性能、模具形状、工艺参数、温度等对成形过程都有影响。若工艺参数和模具结构尺寸选择不当，易造成产品的弯曲、裂纹、缺料等缺陷，模具也极易损坏。为此，本文力图通过数值模拟分析金属的流动规律及金属流动速度、应力应变场和温度场的分布，由此得出挤压过程的特点与反挤压的优势所在，为工模具的设计提供了参考。 本文采用DEFORM软件作为模拟分析的工具，基于刚塑性/刚粘塑性有限元理论，建立了成形过程的有限元模型。论文共分为五大部分： 1.简要的介绍了有限元模拟技术的应用和铝型材挤压成形过程数值模拟的研究现状及发展。 2.根据铝型材挤压过程的特点，对复杂成形过程的数值模拟选用刚塑性/刚粘塑性有限元法，为其建立了合理的理论模型，选择了适宜的求解方法，力求接近模拟真实。 简述了反挤压过程中金属流动特点，并根据其特点设计出挤压模。 4.概述本文所涉及的应用软件UG和DEFORM，并设计了适当的模拟参数，以求与实际过程相符的结果。 对成形过程的数值模拟结果进行了详细的分析，得到了金属流动规律及金属流动的速度场、温度场、等效应力场与等效应变场等，揭示了金属的流动变形规律。 关键词：铝型材；挤压过程；有限元模拟；DEFORM Aluminum Profile XC 748 Extrusion Process Numerical Simulation ABSTRACT Extrusion technology get rapidly developed and widely applied in the field of plastic forming of metal materials，as an efficient, high quality, low consumption of the precision forming technology ,Extrusion Die Design and Manufacturing is the aluminum extrusion materials,especially aluminum profile production of key technologies .Which not only affect product quality, production efficiency and delivery cycle, but also is an important factor in the decision of product cost. As in the process of extrusion relatively large deformation of the workpiece, resulting in severe metal flow and the consumption of large industrial molds, material properties, mold shape, process parameters, temperature, etc. have an impact on the forming process.If the process parameters and mold structure sizes is improper,it will happen to cause the product easy to bend, crack, shut and other defects, and mold damage is also easily.Therefore, this article attempts to analyze the numerical simulation of metal flow pattern, in order to predict possible defects in the process of extrusion,timely correct process parameters, modify the process design and further improve the program. In this dissertation, we use DEFORM software as the tool to simulate and analyze, and establish the finite element analysis model of deformation process,which is based on rigid plastic/rigid vi