大型变壁厚TC4半球超塑胀形工艺研究

对大型TC4钛合金变壁厚半球壳体的超塑胀形工艺进行了研究.采用数值模拟手段先后分析了单向胀形和正反胀形后半球毛坯的壁厚分布规律,指出了正反胀形工艺在壁厚分布上的优势,并给出了反胀模具型面曲线优化的关键参数及其对成形壁厚分布的影响规律.用优化后的模拟数据结果指导实际实验参数设计,在理论分析基础上进行了实验验证.结果表明,...

Process Research on Superplastic Forming(SPF) for TC4 Large Hemisphere Shell of Variable Thickness

Superplastic forming( SPF) process for TC4 large hemisphere shell of variable thickness had been researched in this article. With the help of numerical simulation method,the characteristics of thickness distribution after direct SPF and direct-reverse SPF process were analysed,and the advantages of thickness distribution after directreverse SPF were pointed out. The key parameters of surface curve optimization of the reverse SPF die and its influence on the thickness distribution were given. According to the optimized simulation data,the experimental parameters were designed and verified on the basis of theoretical analysis. The results show that the actual thickness distribution of the part can be well predicted by the numerical simulation. The thickness of the part is redistributed according to need by using optimized SPF forming die. The tensile and yield strength of the material decreases slightly and the elongation increases after SPF. The direct-reverse SPF process can improve material utilizing rate and efficiency of subsequent turning operation obviously,reducing total manufacturing costs.