超塑性成型工艺优化策略

超塑性能在较低应变速率下得到较大变形量,超塑性成型工艺在航空航天领域多用于制造铝合金零件,一般采用气压在高温下实现。为达到最佳成型效果,对其工艺的优化必不可少。对超塑性及其成型工艺做一简介,介绍了采用数值模拟和实验验证提出的超塑性成型工艺优化策略。提出对超塑性成型工艺的优化按单参数优化和多参数优化分类,并给出了相应分类的优化策略,着重给出了成型时间优化中的气压控制和控制空间搜索策略及零件厚度优化,指出了后续研究的方向。

Optimization of the Superplastic Forming Process

Superplasticity is characterized by the very large elongations at break and the relatively low strain rates in the forming process. Superplastic forming is mostly used to produce the aluminum alloys parts in aeronautics and astronautics fields, and this process is usually carried out under an elevated temperature with a forming gas pressure. To reach the best forming effect, the optimization of superplastic forming is necessary. This paper introduces the superplasticity and its forming processes firstly. And then the paper presents the strategies for the optimization of superplastic forming which are proposed with the numerical simulation and verified by the experiments. These optimizations are divided into two types: mono parameter optimization and multi parameter optimization. The related optimization strategies are given in these two types, and the strategies of the pressure control, the control space search and the optimization of thickness are addressed. The research objectives in the future are given at the conclusion.