摘要
为预测航空铝合金薄壁件的铣削加工变形,建立三维有限元模型。通过有限元软件MSC.MARC,向有限元模型添加初始应力场、对节点施加铣削力、控制铣刀路径和对模型的网格进行自适应网格细化。使用该模型进行薄壁零件的铣削仿真。仿真结果表明:铣削之后,薄壁零件呈中间凹陷、四周翘起的盆形。同时,零件的薄壁向内部凹陷。为检验仿真结果的正确性,设计验证实验以测量加工后零件的变形。实验的结果与仿真结果相吻合,证明本文提出的有限元模型可有效预测航空铝合金薄壁件的加工变形。该有限元模型可用来选择合适的加工策略以减小航空铝合金薄壁件的加工变形。
In order to predict machining deformation of aeronautical thin-walled workpiece,a three-dimensional finite element model was built.By use of finite element software MSC.MARC,the initial stress to the model was added,milling force on nodes was imposed,tool path was controlled and adaptive mesh refinement（AMR） method to the model was developed for the model.Milling simulation of aeronautical thin-walled workpiece was conducted by use of the model.Simulation result shows that after machining,the workpiece presents the shape of basin,which means that the central region of the workpiece is concave and lower than the peripheral region around.In addition,the thin walls are dented toward inside of the workpiece.To test the validity of the simulation results,a verification experiment to measure the deformation of machined workpiece was conducted.The experimental result coincides with simulation result.It is proved that the proposed finite element model can effectively predict machining deformation of aeronautical aluminum alloy thin-walled workpiece.The proposed finite element model can be applied to select appropriate machining strategies to reduce machining deformation of aeronautical aluminum alloy thin-walled workpiece.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第5期1696-1702,共7页
Journal of Central South University:Science and Technology
基金
国家重点基础研究发展计划("973"计划)项目(2010CB731703)
关键词
铝合金
薄壁零件
子程序
铣削加工
有限元模型
aluminum alloy
thin-walled workpiece
subroutine
milling
finite element model
