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摘要本文对镁合金管材静液挤压过程进行了数值仿真研究，设计了扩展比为60-70的AZ80镁合金扩管挤压模具，并对模芯结构进行了抗弯强度校核。建立了镁合金扩管静液挤压有限元模型，选择设置合理的工艺参数，采用DEFORM-3D有限元商业软件，对镁合金静液挤压过程进行了数值仿真计算，得出了挤压载荷-行程曲线和挤压制品的等效应力场、等效应变场、温度场、虚拟速度场的分布情况，并对计算结果进行了分析。对模具模芯角度进行了仿真优化分析，确定了模芯角度为120°时为最佳模芯角度。在静液挤压机上针对不同模芯角度进行了工艺试验，验证了静液挤压扩管成形工艺的可行性以及数值仿真结果的可靠性。19340
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关键词 变形镁合金 静液挤压 数值仿真 扩管挤压
毕业设计说明书（论文）外文摘要
Title Numerical simulation of magnesium alloy tubes hydrostatic extrusion
Abstract
The numerical simulation of magnesium alloy tube hydrostatic extrusion process was studied in this paper. With the bending strength of the mold core structure being checked, the AZ80 magnesium alloy tube-expanding extrusion die which has expansion ratio of 60 to 70 was designed. By building the finite element model of magnesium alloy tube-expanding hydrostatic extrusion, choosing and setting reasonable parameters and using the DEFORM-3D commercial software to carry out the numerical simulation of magnesium alloy hydrostatic extrusion process, the extrusion load-stroke curves and the distribution of extruded products’ effective stress field, effective strain field, temperature field and velocity field were concluded. The results were analyzed in detail. The best mold core angle was determined as 120°after a simulation and optimization analysis of mold core angles. The process experiment aiming at different mold core angles was carried on the hydrostatic extrusion machine, having verified the feasibility of hydrostatic extrusion tube-expanding forming process and the reliability of the numerical simulation’s results.
Keywords magnesium alloys hydrostatic extrusion
numerical simulation tube-expanding extrusion
目 次
1 绪论 1
1.1 选题背景 1
1.2 变形镁合金技术 1
1.2.1 变形镁合金及其应用 1
1.2.2 金属塑性成形原理及常用加工技术 2
1.3 静液挤压技术及其发展状况 3
1.3.1 静液挤压技术 3
1.3.2 静液挤压技术的发展状况 6
1.4 研究的主要内容和思路 8
1.4.1 本文主要研究内容 8
1.4.2 镁合金扩管静液挤压研究思路 8
2 镁合金扩管挤压模具设计 10
2.1 挤压模具设计的原则和要求 10
2.2 扩管模具设计方案 10
2.3 模具材料选择 16
2.4 模具强度校核 18
2.5 本章小结 19
3 镁合金静液挤压数值仿真 20
3.1 有限元法在塑性成形中的应用 20
3.2 DEFORM软件简介 20
3.3 实验材料及其物理性能 21
3.4 仿真过程中关键问题的处理 22