摘要
以DN250双波Ti-6A l-4V钛合金波纹管为例研究了采用超塑胀形/轴向加载复合超塑成形工艺成形的钛合金波纹管的壁厚分布规律。用ARVIP3D刚粘塑性壳单元有限元软件模拟了波纹管在胀形、合模和充满3个阶段的壁厚减薄情况,分析了筒坯长度和胀形阶段的变形量对超塑成形后波纹管厚度分布情况影响。通过实验研究了波纹管的实际壁厚分布曲线。结果表明,与其它成形方法相比,超塑成形的波纹管波峰壁厚减薄率较大,壁厚分布可用JIS公式粗略估算。
Taking two-convolution bellows made of Ti-6A1-4V as an example, we studied thickness distribution of bellows made of titanium alloy by using the compound superplastie formation （SPF） method that uses gas pressure and compressive axial load. The thickness thinning during bulging, clamping and cilabrating phases was simulated through using a rigid viseoplasticity shell finite element code ARVIP-3D. The effects of pre-formation length and bulging degree during the bulging phase on the wall thickness distribution of post-formed bellows were analyzed. Experiments were performed to investigate the thickness distribution curve of bellows. Results show that the thickness thinning rate of superplastie-formation bellows is larger than that of hydroformation bellows. The thickness distribution of bellows made of titanium alloy may be calculated roughly by JIS formula.
出处
《机械科学与技术》
CSCD
北大核心
2006年第1期95-98,共4页
Mechanical Science and Technology for Aerospace Engineering
关键词
波纹管
超塑成形
厚度分布
钛合金
数值模拟
superplastic formation
thickness distribution
titanium alloy
numerical simulation
