Mg-Nd-Zn-Zr稀土镁合金无缝管材正反挤压过程模拟  

Simulation of Forward and Backward Extrusion Process of Mg-Nd-Zn-Zr Rare Earth Magnesium Alloy Seamless Tube

作　　者：郑兴伟 赵宗 汪伟 殷浩浩 ZHENG Xing-wei;ZHAO Zong;WANG Wei;YIN Hao-hao(College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China;College of Science,Donghua University,Shanghai 201620,China)

机构地区：[1]上海海洋大学工程学院,上海201306 [2]东华大学理学院,上海201620

出　　处：《精密成形工程》2020年第5期59-65,共7页Journal of Netshape Forming Engineering

基　　金：上海市优秀青年教师基金(ZZSHOU16016);上海海洋大学博士启动基金(A2-0203-17-100325)。

摘　　要：目的研究稀土镁合金无缝管材制备过程,开展模具结构优化和正反挤压过程的有限元研究,为稀土镁合金的无缝管材制备提供技术基础。方法通过对稀土镁合金无缝管材正反挤压过程进行数值模拟,分析了在正反挤压过程中,反挤压凸模圆角、正挤压挤压角及挤压工艺参数对应变场的影响规律,以降低工艺参数对模具寿命的影响,提高产品成形质量。结果在无缝管材挤压成形过程中,当凸模圆角半径为10 mm,挤压角为30°时,应变分布更为均匀,所需挤压力最低。随着挤压温度的升高,应变分布越来越均匀,所需挤压力下降,适宜的挤压温度为400℃。结论合理的凸模圆角半径和挤压角可以改善挤压流场、应变分布及降低挤压力。挤压温度对流场影响较小,挤压力随着摩擦因数增加而增加。The paper aims to study the preparation process of Mg-Nd-Zn-Zr rare earth magnesium alloy seamless pipe,carry out finite element study of mold structure optimization and forward and backward extrusion process,and provide technical basis for the preparation of Mg-Nd-Zn-Zr rare earth magnesium alloy seamless pipe.Through numerical simulation of the forward and backward extrusion process of rare earth magnesium alloy seamless pipe,the influences of the punch angle of the backward extrusion punch,the forward extrusion angle and the extrusion process parameters on the strain field during the forward and backward extrusion were analyzed.In the extrusion molding process of seamless pipe,when the punch radius was 10 mm and the extrusion angle was 30°,the strain distribution was more uniform and the extrusion pressure required was the lowest.With the increase of extrusion temperature,the strain distribution became more and more uniform,and the extrusion pressure required decreased.The suitable extrusion temperature was 400℃.Reasonable punch radius and extrusion angle can improve extrusion flow field,strain distribution and reduce extrusion pressure.The extrusion temperature has little influence on the flow field and the extrusion pressure increases with the increase of friction factor.

关 键 词：无缝管材 镁合金 有限元 挤压 

分 类 号：TG379[金属学及工艺—金属压力加工]