论文部分内容阅读
为研究正反向超塑胀形工艺对厚度分布的影响,应用商业有限元软件MARC对带有凹槽的深盒形7475合金零件正反向超塑胀形过程进行了有限元模拟,并对不同工艺条件下成形后零件的壁厚分布结果进行了分析.研究表明:正反向超塑胀形工艺是控制成形零件壁厚的有效途径,通过优化压力-时间曲线和反向胀形模具形状,明显改善了零件的厚度分布,达到了零件的设计要求;后处理直观地显示了该零件正反向超塑胀形的全过程,为成形提供了合理的方案;零件变形各阶段的应变速率控制在7475合金的应变速率范围内,证明压力-时间曲线设计合理.
In order to study the effect of forward and reverse superplastic bulging process on the thickness distribution, finite element simulation of forward and reverse superplastic bulging of deep grooved 7475 alloy with groove was carried out by commercial finite element software MARC. The results of wall thickness distribution of the formed parts under different process conditions were analyzed.The results show that the positive and negative superplastic bulging process is an effective way to control the wall thickness of formed parts.Through optimizing the pressure-time curve and reverse bulging mold shape , Significantly improved the thickness distribution of the parts and reached the design requirements of the parts. Post-processing showed the whole process of the positive and negative superplastic bulging of the parts intuitively and provided a reasonable solution for the forming. The strain rate Control within the strain rate range of the 7475 alloy proves that the pressure-time curve is well designed.