文档介绍：铝型材XC 748挤压过程的数值模拟
摘要
挤压技术作为一种高效、优质、低消耗的精密成形技术,在金属材料的塑性成形领域中得到迅速发展和广泛应用。挤压工模具设计与制造是铝合金挤压材,特别是铝合金型材生产的关键技术,不仅影响产品的质量、生产效率和交货周期,而且也是决定产品成本的重要因素之一。
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:
。
,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。
,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 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 , 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 to