基于材料内部残余应力释放的加工变形仿真实验研究

摘要

Based the plastic-elastic theory,a 3-D milling FRM analysis model is established in it, which uses the "element birth and death" technique to simulate the material removal process.Then the ma-ckining deformation of components caused by the release of initial residual stress it studied.And deformation test in NC machining typical comftonents is designed,which adopts the. Three dimensional coordinates system to measure the value of deformal ion 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 FKM model is estidlished;Thus a reasonable mnehining technology could be worked out to reduce the machining deformation.%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.