基于力-热耦合仿真模型的切削引入残余应力形成规律研究OA

The metal cutting process is a highly nonlinear material reduction process with coupling of multiple factors and multiple physical fields,involving large deformation of materials.In order to realize the digitization,informatization and intellectualization of cutting process,this paper studies the constitutive model of cutting materials.AdvantEdge and Abaqus are used to establish a numerical simulation analysis model of mechanical and thermal coupling in cutting process.Cutting tests are used to verify the correctness and reliability of the finite element model.Through orthogonal tests,the influence on spindle speed,cutting speed,milling depth and milling width on cutting force,surface temperature and surface residual stress are analyzed.The results show that the sharp temperature rise at the cutting position at the beginning of cutting results in intense thermo-elastoplastic deformation on the cutting surface,which is the main cause of residual stress production.For 7050 aluminum alloy thick plate after solution treatment and aging treatment,it is found that the cutting speed has the greatest impact on the surface residual stress.The minimum cutting parameters of the surface residual stress are:feed speed of 1200mm/min,milling depth of 0.5mm,milling width of 12mm and spindle speed of 4000r/min.This paper provides a new method to analyze the surface residual stress of 7050 aluminum alloy thin-wall structural parts in cutting process,and provides a theoretical basis for high-precision manufacturing of thin-wall structural parts in aerospace field.