铣削加工对铝合金薄壁件残余应力的影响

Influence of Milling on Residual Stress of Aluminum Alloy Thin-walled Package

研究了铣削加工对铝合金薄壁件残余应力的影响。在有限元软件MSC.MARC中建立了三维有限元模型,通过二次开发,编制了相应的子程序,分别用来向有限元模型中添加初始残余应力场,对节点施加铣削力,控制铣削路径和对模型的网格进行自适应细化,使用该模型进行薄壁零件的铣削仿真。结果表明:随着铣削的进行,试件余料内部应力不断释放,应力场出现重分布。通过比较不同铣削深度时的应力分布情况,得到了铣削加工对薄壁零件残余应力的影响规律。

In order to research milling＇s influence on residual stress of aeronautical thin-walled workpiece,a three-dimensional finite element model was built in MSC.MARC software.Through redevelopment,relevant subroutines which were used respectively to add initial residual stress to model,to impose milling force on nodes,to control tool path of milling and to apply adaptive mesh refinement（AMR） method to the model were developed for the model.The milling simulation of aeronautical thin-walled workpiece was conducted by the use of the model.The simulation results show that with the milling,the stress has a constant relaxation and redistribution inside the rest of the workpiece.Compared with milling stress distribution of the different layers,the law that influence on the residual stress of thin-walled package is acquired.