5052铝镁合金板材胀形性能研究及数值模拟  

Study and numerical simulation on bulging properties of 5052 Al-Mg alloy sheet

作　　者：郭瑞东 薛松[1] 邓爱林[1] 刘稆 Guo Ruidong;Xue Song;Deng Ailin;Liu Lyu(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《锻压技术》2019年第2期13-18,共6页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(61505169);西南科技大学博士基金(13zx7153)

摘　　要：在微机控制板料成形试验机上对5052铝镁合金板材胀形性能进行测试,获得了室温下厚度为1. 2 mm的板材在不同压边力、冲压速度及润滑条件下板材的杯突值。试验结果表明:当压边力在5～15 k N范围内时,杯突值随着压边力的增大而增大,当压边力大于15 k N时,杯突值随着压边力的增大而减小;杯突值随着冲压速度的增大而增大;有润滑条件下比无润滑条件下的杯突值要大,且薄膜润滑比机油润滑的杯突值大。此外,在试验基础上利用有限元分析软件Dynaform对不同摩擦系数的5052镁铝合金板的成形过程进行数值模拟,根据成形极限图获得了虚拟的杯突值,并预测了试样的开裂部位。模拟分析表明:数值模拟结果与试验结果有一定的差异,但不影响摩擦系数对板料杯突值的成形规律,且开裂部位与试验结果一致。The bulging performance of 5052 Al-Mg alloy sheet was tested by a microcomputer controlled sheet metal forming test machine,and Erichsen values of sheets with thickness of 1.2 mm at room temperature were obtained under different blank holder forces,stamping speeds and lubrication conditions.The test results show that when the blank holder force is within the range of 5-15 kN,the Erichsen value increases with the increase of blank holder force.When the blank holder force is greater than 15 kN,the Erichsen value decreases with the increase of blank holder force.Moreover,the Erichsen value increases with the increase of stamping speeds,and the Erichsen value under lubrication condition is greater than that under unlubricated condition as well as the Erichsen value with thin-film lubrication is greater than that with lubricating oil.Based on the experiment,the forming processes of 5052 Al-Mg alloy sheet with different friction coefficients were simulated by software Dynaform.Then,the virtual Erichsen value was obtained according to the forming limit diagram,and the cracking position was predicted.The results of simulation show that there is a difference behveen the numencal simulation result and the experiment result,which doesn't affect the forming regularity of the friction coefficient on the Erichsen value of sheets.Furthermore,the simulated cracking position is the same as that of the experiment.

关 键 词：杯突试验 压边力 冲压速度 润滑条件 数值模拟 

分 类 号：TG389[金属学及工艺—金属压力加工]