β钛合金环形管热推扩质量分析与控制

Quality Analysis and Control of Ring Pipe Hot Push-Expanding of β Tianium

为了研究β钛合金环形管热推的各种质量问题,进行了β钛合金环形管的热推制实验,并采用网格法和有限元法对成形过程进行了分析,研究了实验中诸多质量问题(如起皱、开裂、壁厚不均等)产生的原因,并提出了相应的控制措施。结果表明,羊角芯模、扩径比、温度场、速度等都是影响环形管质量的重要因素,各影响因素相互作用,需协调控制。协调控制原则:羊角芯模、扩径比为设定因素,温度场为关键因素,推制速度为协调因素。

To study the forming quality during ring pipe hot push-expanding, the hot push-expanding experiments of β titanium alloy were carried out, and the process of hot push-expanding was analyzed by a mesh method and a finite element method. Moreover, the causes of quality defects, such as corrugate, cracking, wall unevenness, and ellipticity, were discussed. The results show that ram-horn mandrel, expanding radio, temperature and velocity are important parameters which influence the forming quality of ring pipe. They interact with each other and need a coordinated control. The coordinated control principle is that the ram-horn mandrel and the expanding ratio should be set, the temperature is a key factor, and the velocity is a coordination factor.