摘要
加工变形是航空整体结构件数控加工领域普遍存在的问题.选取典型航空整体结构件,基于有限元法研究了毛坯初始残余应力对于加工变形的影响,仿真结果与试验结果一致;对残余应力引起的加工变形特点进行了分析,基于不同加工路径对航空结构件加工变形进行了有限元数值仿真,结果表明,对于单一残余应力引起的加工变形分析,可以忽略加工路径的影响.考虑铣削力与残余应力的耦合作用,建立了残余应力、铣削力的耦合力学模型,给出了具体仿真流程,针对不同加工路径进行有限元仿真,研究了铣削力对于残余应力分布及最终加工变形的影响.
Machining deformation has been a bottle-neck issue in aeronautical manufacturing field. Based on finite element simulation, the influence of original residual stresses on the deformation in the process of machining for aeronautical monolithic component was studied. The redistribution law of residual stresses during machining and the trend of deformation change were analyzed. The simulation conclusions agree with experimental results. The machining deformation characteristics due to residual stresses were analyzed and the simulation of different machining path was carried out. The results indicate that the research on deformation caused by residual stresses alone can neglect the effect of machining path. The coupling effect between residual stress and milling force was taken into account and the simulation was performed for different machining path.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2009年第2期188-192,共5页
Journal of Beijing University of Aeronautics and Astronautics
基金
国防基础科研资助项目
关键词
残余应力
加工变形
有限元
铣削力
加工路径
residual stress
machining distortion
finite element method
milling force
machining path
