Simulation Analysis on Vibration-assisted Forming Law of TC4 Titanium Alloy Pipe

Ti-6Al-4V (TC4) titanium alloy tube forming was studied by using cold heading. The forming processes of vibration assisted preforming, forward extrusion, upsetting head and backward extrusion were simulated by using Simufact finite element software. The forming characteristics of vibration assisted forming process of titanium alloy were studied. The effect of amplitude, vibration frequency and punch feed speed on the forming law of the blank were analyzed by orthogonal test. The results show that when the feed velocity of the punch is greater than the critical velocity, the die and the material remain in contact without separation, and the fluctuation of forming force is not obvious.When the feed speed of the punch is less than the critical speed and the vibration is applied, the die and material will be temporarily separated with the vibration, resulting in the decrease of the total average forming force and the decrease of the flow stress. The influence degree of each pass is amplitude> feed speed> frequency.