基于材料内部残余应力释放的加工变形仿真实验研究  

Research on machining deformation simulation based on residual stress release within material

作　　者：李淑君[1] 万晓航[1] 

机构地区：[1]河北工业职业技术学院机电系,石家庄050091

出　　处：《机械设计与制造》2011年第12期135-137,共3页Machinery Design & Manufacture

基　　金：河北省科技厅资助项目(08215603D)

摘　　要：在弹塑性理论的基础上,建立了三维铣削仿真加工变形场的有限元分析模型,利用"单元生死"技术仿真了加工过程中材料的去除。研究了零件在加工过程中因毛坯初始残余应力的释放而引起的工件加工变形规律。设计了典型零件的数控加工变形试验,使用三坐标测量仪测量了每次材料去除后产生的变形。通过仿真数据与试验数据比较分析,数据结果表明,只要建立正确的三维有限元分析模型,完全可以实现对零件加工变形规律的预测,从而制定出减小工件加工变形的合理加工工艺。Based the plastic-elastic theory,a 3-D milling FEM analysis model is established in it, which uses the ＂element birth and death＂technique to simulate the material removal process.Then the machining deformation of components caused by the release of initial residual stress is studied.A nd deformation test in NC machining typical components is designed,which adopts the three dimensional coordinates system to measure the value of deformation after removing material each time.Through contrasting the results of simulation and experiment, it can be drawn that the machining deformation law can be predicted if a reasonable 3-D FEM model is established;Thus a reasonable machining technology could be worked out to reduce the machining deformation.

关 键 词：整体结构件 残余应力 生死单元 加工变形 

分 类 号：TH16[机械工程—机械制造及自动化] TG54[金属学及工艺—金属切削加工及机床]