以钛合金筒形件为研究对象,针对传统气胀成形存在减薄率过大问题,开展了预拉深-气胀复合成形方法研究。采用数值模拟分析了传统气胀成形中筒底减薄率过大的原因,实验研究了不同加载路径对TA15筒形件减薄率的影响。结果表明：气胀成形的加载速度对减薄率有一定的影响,慢速气胀和快速气胀成形件最大减薄率分别为63.2%、54.2%,仅提高加载速度并不能满足壁厚均匀性要求;在有一定预拉深的情况下,通过热拉深-气胀复合成形,最大减薄率可减小到36.7%。热拉深-气胀复合成形工艺可有效改善成形件的壁厚分布均匀性.
In the traditional gas bulging process, excessive thinning often happens. To improve the thickness u- niformity of Ti-alloy cup-shaped parts is researched. The reason for excessive formed by gas bulging, a process combined with drawing and gas bulging thinning in gas bulging process is analyzed by numerical simulation, and the effects of loading paths on thinning ratio of TA15 cup-shaped part formed in the process are studied by ex- periments. The results show that the loading speed of gas pressure influences the thinning ratio. The maximum thinning ratios of the parts formed by slow gas bulging and fast gas bulging are 63.2% and 54.2%. The re- quirement of thickness uniformity cannot be satisfied by increasing loading speed alone. However, the maximum thinning ratio of the part formed by drawing and gas bulging can be reduced to 36.7%. It is illustrated that the thickness uniformity can be improved effectively by the hot deep drawing-gas bulging process.
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