摘要
在AZ31镁合金板材热拉深成形过程中,压边力Pb可根据成形特点进行设计,压边力过大、过小会引起试样破裂或起皱,至使成形过程不能顺利进行。利用自行设计的拉深模具,采用加热圈与加热棒连接热电偶的方式对凹模与冲头进行控温;通过对弹簧压下量的控制分别施加固定压边力与渐变压边力来研究压边力对AZ31镁合金热拉深成形性能的影响,并采用正交各向异性屈服准则和Wagoner提出的考虑了应变速率与温度影响的应力-应变材料模型,编制用户子程序嵌入MSC.Marc软件中对拉深过程进行了数值模拟,模拟结果与试验结果具有较好的对照性。结果表明,在其它条件合适的情况下,采用浮动压边力(控制在2kN^10kN),可以成形出无破裂与起皱的合格产品。模拟结果与试验有良好的对照性,证明可以用数值模拟来指导实际成形过程。
When deep drawing of AZ31 sheet, the blank holding force （BHF） can be designed according to the characteristic of the forming process. If the BHF is too high or low, the crack or wrinkle will occur. In the experiments, the temperatures of the die were controlled by the thermocouples connected to heating components, and the fixed and gradually changed blank holding forces were exerted by controlling the compression of degree spring. The forming processes of the sheet at different BHF also have been researched by numerical simulation, when the other conditions are suitable, and gradually changed .blank holding forces increased from 2 to 10kN exerted to the sheet, qualified samples can be produced. The results of the simulation have a good agreement with the experiments, so the numerical simulation can direct the forming process successfully.
出处
《轻金属》
CSCD
北大核心
2009年第3期52-56,共5页
Light Metals
基金
2005年广东省科技计划项目(2005B10301020)
