Research on spinning quality of thin-walled parts based on regular polygon section

Based on the new non-circular spinning forming method, the forming trajectory equation of the contour of the spinning wheel pair of polygonal parts was discussed. Taking the spinning of equilateral triangle section and regular pentagonal section as an example, the influence of three technological parameters, namely, spindle speed, feed ratio of spinning wheel and passes, on the wall thickness difference of spinning parts with regular polygon section in the spinning process of the new non-circular spinning forming method was studied. The finite element software is used for simulation analysis. According to the simulation results, the wall thickness distribution of the regular polygon spinning parts was analyzed, that is, the wall thickness of the regular polygon spinning parts was distributed periodically, and the maximum wall thickness occurs to the corner of the regular polygon spinning parts. The Box-Behnken experimental design method was used to design the simulation experiment. The variance analysis of the wall thickness difference between in the parts was carried out according to the simulation data, and the prediction model of the wall thickness difference was established and optimized. Finally, multiple groups of simulation study are carried out to verify the accuracy of the model. The results show that the spindle speed, the feed ratio of the spinning wheel and the pass have significant effects on the wall thickness difference of the regular polygon parts. The spindle speed was positively related to the wall thickness difference, while the feed ratio was negatively related to the wall thickness difference. The effect of the pass on the wall thickness difference decreases first and then increases.