Reserach On The Simulation Of The Surface Residual Stress Of Aircraft Casing Parts

As the main component part and base of the aeroengine,the aeroengine casing part is usually made of superalloy blank by cutting due to the high temperature and high pressure in service.Surface integrity,including surface roughness,surface morphology,and residual stress,will severely restrict the service performance and fatigue life of such parts.In the paper,the casing parts made of GH3044 are taken as the research object.The distribution of the residual stress on the machined surface is studied by the finite element analysis method,and the surface residual stress and machining deformation are predicted and optimized.The main research contents are as follows:Firstly,the research status of surface integrity,such as surface roughness,surface residual stress and work hardening,is reviewed.The cutting mechanism,chemical and physical mechanical properties of typical superalloys are analyzed.Secondly,the basic idea of the finite element analysis,material constitutive model,chip separation criteria,workpiece tool friction model,adaptive mesh generation,software selection principles and detailed simulation steps are briefly described.Based on the finite element simulation of cutting process,the influence of cutting speed,feed rate and cutting depth on the surface residual stress is studied by single factor experiment,and the corresponding influence law is found out.Orthogonal test and range analysis method were used to determine the magnitude and significance of each cutting parameter’s effect on the surface residual stress.Finally,the turning and processing of the inner and outer rings of the flame tube are taken as examples for simulation and experiment.According to the typical machining features of the typical aeroengine casing parts,the surface residual stress and deformation are predicted by establishing a simplified three-dimensional workpiece model and a finite element simulation model.The results of simulation and cutting experiments show that the surface residual stress and machining deformation can be significantly reduced by adjusting the cutting parameters of key processes,and the machining quality of casing parts can be improved.