Marginal-restraint mandrel-free spinning process for thin-walled ellipsoidal heads  

作　　者：Yong-Cheng Lin Jia-Yang Chen Dao-Guang He Xin-He Li Jian Yang 

机构地区：[1]School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,People's Republic of China [2]State Key Laboratory of High Performance Complex Manufacturing,Changsha 410083,People's Republic of China [3]Light Alloy Research Institute,Central South University,Changsha 410083,People's Republic of China

出　　处：《Advances in Manufacturing》2020年第2期189-203,共15页先进制造进展（英文版）

基　　金：supported by the National Nat-ural Science Foundation of China(Grant No.51775564);the 973 program(Grant No.2014CB046600);the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2019zzts946).

摘　　要：Metal sheet spinning is an advanced near-net forming technology for the manufacture of thin-walled ellipsoidal heads.The exact control of dimensional accuracy,however,is a considerable problem for spinning thinwalled parts with large diameter-to-thickness ratios.In this work,a marginal restraint mandrel-free spinning process with two passes is proposed for the fabrication of thinwalled ellipsoidal heads without wrinkling.A finite element model is established and verified to study the influences of spinning parameters on the dimensional precision of thin-walled ellipsoidal heads.It is found that the spinning parameters considerably influence the deviations of wall thickness and contour characteristics.A small forming angle or small roller fillet radius during the first pass spining,as well as the small angle between passes or high feed ratio during the second pass spinning,can improve the wall thickness precision.Meanwhile,as the forming angle or feed ratio is increased during the first pass spinning,the contour precision initially increases and then decreases.During the second pass spinning,the contour precision can be improved at a small angle between passes,whereas it deteriorates at a larger roller installation angle.The optimized spinning parameters are obtained and verified by experiments.

关 键 词：ALLOY Thin-walled ellipsoidal heads Spinning Finite element model Dimensional precision 

分 类 号：TG146[一般工业技术—材料科学与工程]