基于稳健设计的钛合金波纹管超塑成形工艺

根据稳健设计中的响应面法—复合设计法,用MARC有限元分析软件模拟了钛合金波纹管超塑成形过程的胀形、合模和充满3个阶段。根据模拟结果得到了钛合金波纹管质量评价指标波峰最小厚度及其影响因素筒坯高度和胀形阶段成形气压之间的二元一次和二元二次多项式回归公式,从而实现了钛合金波纹管超塑成形工艺参数的稳健设计。Ti-6Al-4V双波DN250波纹管超塑成形实验证明了回归公式的准确性和复合设计法用于钛合金波纹管超塑成形过程的可行性。

Superplasticforming process design of titanium alloy bellows based on robust design method

The superplasticforming process of titanium alloy bellows has been analyzed using MARC finite element code with respect to Response Surface Methodology of Robust Design-Composite Design Methodology. The binary simple and binary quadratic polynomial regression equations of quality index namely Crown Minimum Thickness for titanium alloy bellows and its influencing factors namely Perform Height and Bulging Gas Pressure can be obtained By means of numerical results, thereby the robust design of the superplasticforming processes of titanium alloy bellows was obtained. The correctness of the regression equation and the feasibility of superplasticforming Robust Design Methodology have been proved through superplasticforming experiments of two-corrugation DN250 bellows made of Ti-6Al-4V.