Research on finite element simulation of hollow spinning for tubular part with concave arc generatrix
Wu Hao, Jia Zhen, Han Zhiren, Qi Xingjiang，Gao Tiejun
（Key Lab of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China）
Abstract: It is difficult to form the tubular part with concave arc generatrix by hollow spinning. The finite element simulation method was adopted to forecast the forming process of the tubular part with concave arc generatrix, and a theoretical basis for subsequent experiments and production was obtained. Firstly, the motion relationship equations of single pass concave arc roller were deduced theoretically. Then the equations were used as boundary conditions to simulate. Three kinds of spinning methods were proposed. Comparing the simulation results with analysis, it shows that the equilibrium of the free end metal flow of the tubular blank can be controlled by the dynamic mandrel. Due to the smaller relative radial feed in each pass, multi-pass spinning contributes to the wrinkles control of the arc portion and better thickness uniformity. And the ovalization of the cross section on the arc top is also smaller by multi-pass spinning.
Key words: tubular part with concave arc generatrix roller path hollow spinning single pass forming multi-pass forming