AZ80镁合金管材反挤压成形的数值模拟与试验研究  

Numerical Simulation and Experiment on Backward Extrusion Forming of AZ80 Magnesium Alloy Pipe

作　　者：卢云[1] 吴志林[1] 李灿灿 

机构地区：[1]南京理工大学机械工程学院.南京210094

出　　处：《特种铸造及有色合金》2017年第11期1201-1205,共5页Special Casting & Nonferrous Alloys

基　　金：国家科技重大专项基金资助项目(2012ZX04010101)

摘　　要：采用Deform-3D软件对AZ80镁合金厚壁管材的反挤压过程进行了数值模拟,模拟了不同挤压温度和挤压速度对反挤压成形过程的影响。结果表明,反挤压过程的等效应变主要集中在凸模与坯料接触处和管壁上,管材的内壁和外壁损伤值较大,容易产生损伤。挤压温度越高,管材成形的温差、等效应力和挤压载荷就越小,挤压变形越均匀。挤压速度越小,金属的流动速率峰值越小,金属流动越均匀,管材温差越小,挤压变形越均匀。通过镁合金管材的反挤压试验,验证了模拟结果的准确性。Numerical simulation of backward extrusion AZ80 magnesium alloy thick-walled pipe was carried out by using Deform-3 Dsoftware.The influence of extrusion temperature and extrusion speed on the forming process of backward extrusion was simulated and analyzed.The results reveal that the equivalent strain of the reverse extrusion process is mainly concentrated on the contact position between the punch and blank as well as on the pipe wall.The damage value of the inner wall and the outer wall of the pipe exhibits serious,and it is easy to cause damage.With increasing in the extrusion temperature,the temperature difference,equivalent stress and extrusion load of the tube forming are decreased,so the extrusion deformation is more uniform.With decreasing in the extrusion speed,the peak value of the metal flow rate is decreased,and the metal flow is more uniform with the decrease of the tube temperature difference,so the extrusion deformation presents more unifrom.The reliability of the simulated results is verified by the backward extrusion test of the magnesium alloy tube.

关 键 词：数值模拟 AZ80镁合金 反挤压 厚壁管材 

分 类 号：TG379[金属学及工艺—金属压力加工]