Finite element analysis of deformation characteristics in cold helical rolling of bearing steel-balls  

作　　者：曹强 华林 钱东升 

机构地区：[1]School of Materials Science and Engineering, Wuhan University of Technology [2]Hubei Key Laboratory of Advanced Technology of Automotive Parts (Wuhan University of Technology) [3]School of Automotive Engineering, Wuhan University of Technology

出　　处：《Journal of Central South University》2015年第4期1175-1183,共9页中南大学学报（英文版）

基　　金：Project(2011CB706605)supported by the National Basic Research Program of China;Project(IRT13087)supported by the Innovative Research Team Development Program of Ministry of Education of China;Project(2012-86)supported by the Grant from the High-end Talent Leading Program of Hubei Province,China

摘　　要：Due to the complexity of investigating deformation mechanisms in helical rolling(HR) process with traditional analytical method, it is significant to develop a 3D finite element(FE) model of HR process. The key forming conditions of cold HR of bearing steel-balls were detailedly described. Then, by taking steel-ball rolling elements of the B7008 C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established under SIMUFACT software environment. Furthermore, the deformation characteristics in HR process were discovered, including the forming process, evolution and distribution laws of strain, stress and damage based on Lemaitre relative damage model. The results reveal that the central loosening and cavity defects in HR process may have a combined effect of large negative hydrostatic pressure(positive mean stress)caused by multi-dimensional tensile stresses, high level transverse tensile stress, and circular-alternating shear stress in cross section.Due to the complexity of investigating deformation mechanisms in helical rolling（HR） process with traditional analytical method, it is significant to develop a 3D finite element（FE） model of HR process. The key forming conditions of cold HR of bearing steel-balls were detailedly described. Then, by taking steel-ball rolling elements of the B7008 C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established under SIMUFACT software environment. Furthermore, the deformation characteristics in HR process were discovered, including the forming process, evolution and distribution laws of strain, stress and damage based on Lemaitre relative damage model. The results reveal that the central loosening and cavity defects in HR process may have a combined effect of large negative hydrostatic pressure（positive mean stress）caused by multi-dimensional tensile stresses, high level transverse tensile stress, and circular-alternating shear stress in cross section.

关 键 词：cold helical rolling finite element（FE） simulation rotary forming bearing steel-balls 

分 类 号：TH133.3[机械工程—机械制造及自动化] TG335[金属学及工艺—金属压力加工]