Investigation on metal flow during the hot axial closed die rolling process for titanium alloy discs

Abstract

The hot axial closed die rolling (ACDR) process provides a method to save forming loading for the deformation of titanium alloy discs, but the process parameters differ from the conventional forging. For instance, feed rate of upper die v, angular velocity of lower die ω, feed displacement per revolution of ACDR equipment S, and inclination angle of cone shape γ should be considered simultaneously on the metal plastic flow during hot forming. So, the FE modeling of hot ACDR forming is built reasonably under the SIMUFACT software for dynamic analysis of the hot process. Also, the flow stress curves of TC4 alloy at different temperatures are described by utilizing a Gleeble 3500 machine, and the formula and range of the main parameters are calculated, both of them are included in this model. The laws of metal flow, the strain and temperature field during the process, and, the final, the loading history of ACDR have been explored and analyzed in detail through changing process parameters of v, ω, γ, and S regularly.