In this paper,the hydroforming of U-shaped TA34 titanium alloy bellows was studied by finite element simulation and forming experiment.The influences of billet length and internal pressure on arc length,wall thickness and springback of bellows during the forming process were analyzed.The results showed that with the increase of billet length and internal pressure,the arc length increased linearly,the wall thickness of the forming part decreased,and the axial and circumferential springback of the forming part increased.With the increase of the arc length,the axial and circumferential springback of the formed parts increased linearly.The process could control the difference between the wave height and the wave width of the forming parts to less than 5％.The U-shaped TA34 titanium alloy bellows were successfully formed by using the optimized process parameters.
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