滚压强化的残余应力的数值仿真及工艺分析  

FE simulation of residual stresses by surface rolling and analysis of rolling process

作　　者：王生武[1] 温爱玲[2] 邴世君[1] 金学松[2] 

机构地区：[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]大连交通大学机械工程学院,辽宁大连116028

出　　处：《计算力学学报》2008年第S1期113-118,共6页Chinese Journal of Computational Mechanics

基　　金：西南交通大学牵引动力国家重点实验室资助项目

摘　　要：表面滚压强化,由于在表层引起加工硬化和残余压应力,可以十分有效地提高构件、零件疲劳强度,而滚压强化的有限元数值仿真,将成为分析优化滚压强化工艺的重要手段。本文建立了连续多、圈滚压工艺的有限元数值仿真模型,获得了比较合理的滚压变形与残余应力结果。在此基础上对滚压工艺做了进一步分析。结果表明,滚压变形的进给量太大、滚压的转速太快都容易造成工件表层残余应力分布的不均匀甚至形成残余拉应力;在滚压与未滚压的过度区域,从表面到心部的近1mm范围内,均未出现人们通常所担心的残余拉应力。这将在工程生产实践中,为滚压工艺制订提供重要的依据。Surface hardening by rolling is very effective on the improvement of fatigue strength of components because of the compressive residual stress by rolling.And,FE Simulation of the surface rolling will be the important method of analysis the surface rolling process.The investigation carried out 3D FE simulation of surface rolling process of the round bar workpiece under circulatory rolling and continuous rolling feed.The plastically formed result which agrees well with experimental result was obtained by analyzing and modifying the boundary conditions,realization of rolling and setting of contact.The Msc.Marc program was applied to analyze the distribution of residual stress after surface rolling.And the influences of different feed rate,mesh and boundary conditions in the distribution rules of residual stress were discussed by comparison.The result indicates that smaller feed rate leads and rotation rate to more uniform distribution of residual stress.

关 键 词：滚压 残余应力 工艺分析 有限元 

分 类 号：TG376[金属学及工艺—金属压力加工]