Ti75管材高温弯曲成形的正交有限元模拟

Orthogonal finite element simulation of Ti75 tube bending at high temperature

为了研究高温环境下温度、助推速度、弯曲速率对钛合金Ti75管材弯曲成形质量的影响,并确定最佳的加热温度。采用有限元软件ABAQUS对Ti75钛合金管在高温环境下的数控弯成形过程进行了有限元模拟。由于模型中涉及到热和力,所以有限元模拟使用顺序耦合热应力分析法。首先分析传热问题,然后将得到的温度场作为已知条件,进行热应力分析,得到应力应变场。结果表明:助推速度对Ti75钛合金管热弯成形有显著影响,助推速度比值为1时成形质量最佳;450℃为最佳成形温度;在满足使用要求的前提下,选择较短弯曲时间能获得相对较好的成形质量,并提高生产效率。此外,实验成形的管材形状与模拟结果相吻合,验证了有限元仿真模拟技术的可靠性。

In order to study the influence of temperature,boost speed and bending rate on the bending forming quality of titanium alloy Ti75 pipe under high temperature environment and determine the optimum heating temperature,the numerical control thermal bending process of the Ti75 titanium alloy tube under high temperature environment was simulated by finite element software ABAQUS.Because heat transfer and stress problems were involved in the model,the finite element simulation was used sequential coupled thermal stress analysis.First,the heat transfer problem was analyzed to obtain the temperature field,and then the obtained temperature field was taken as a known condition,and the thermal stress analysis was carried out to obtain the stress strain field.The results show that the boost speed has a significant effect on the thermal bending of the Ti75 titanium alloy tube,and the optimum forming quality is obtained when the boost speed ratio is 1;the best forming temperature is 450℃.Under the premise of satisfying the requirements of use,the shorter bending time is helpful to obtain good forming quality and improve the production efficiency.In addition,the shape of the tube formed by the experiment coincides with the simulation results,which verifies the reliability of the finite element simulation analysis.