FEM Numerical Simulation Of Precision Forming Process Of Tube Inversion By Axial Drawing

TIAD(Tube Inversion by the Axial Drawing) is an advanced forming process for manufacturing double-walled tubes with high quality, high efficiency, low consumption and good flexibility for size changing. However, whether to realize forming process depends on whether to produce the tearing in deforming zone. Therefore, it is important to study an influence of forming condition parameters on the forming load by FEM numerical simulation for the realization and the development of TIAD precision forming process. A brief introduction to the project and its main results obtained are as follows: The deformation mode and its FEM simulation model for TIAD precision forming process has been studied and given. Based on research of key techniques of rigid-plastic FEM simulation, the numerical simulation system named Tube Inversion-3 for TIAD precision forming process has been developed. A simulation and analysis has been carried out by using Tube Inversion-3 for TIAD precision forming process, and it makes clear the mechanism of t TIAD precision forming process the influence of forming condition parameters on the forming load. The results show that the following: (1)During the whole forming process, the shape of the tube keeps unchanged, so the precision forming can be easily realized; (2) The deforming force sharply rises in the initial stage; once reaching steady forming state, the deforming force nearly keeps constant; (3) For a given r/d0 or t0/d0, the deforming force depends mainly on the value of nt0, and there is a critical parameter k, when r/t0k, the steady forming force increases with an increase of nit0 (4) The material hardening exponent n of the tube and the friction * The project is supported by the National Science Foundation of Chiria(grant No 59775055). 一 豆互 一 qcoefficient P have a remarkable influence on the defOrming fOrce. The smallerthe value of n and the larger the value of ll the larger the forming force.Furthermore, good friction condition will help to improve the surface quality ofthe part gained.