Research On Stress Control And Machining Deformation Of Weakly Rigid Pure Copper Components

In the precision machining of weak rigid plane component,the initial residual stress and its distribution are the important factors affecting its machining deformation.Therefore,this article puts forward symmetric shape-symmetry stress control-remove the rolling of pure copper plane manufacturing technology,the development of flat pieces of new heat treatment quenching plus the stress relieving method,the regulation of pure copper flat pieces of residual stress in the thickness direction is symmetrical,establish a symmetric shape-symmetry stress control-remove the finite element simulation model,The residual stress evolution process of rolled pure copper flat parts in the new heat treatment process was predicted,and the influence of initial residual stress on subsequent machining deformation was studied,and the machining and manufacturing of weakly rigid pure copper components oriented to the minimum machining deformation was realized.The main research contents of this paper are as follows:The multi-pass rolling experiment of pure copper flat parts was carried out to establish the finite element simulation model of the multi-pass rolling of pure copper flat parts to obtain the overall residual stress field.The residual stress of rolled pure copper flat parts was measured by electronic laser speckle hole method to verify the accuracy of the finite element model.The equipment used in the heat treatment experiment was selected to measure the surface convection heat transfer coefficient of pure copper during quenching,and the quenching and stress-relieving annealing experiments of pure copper plane parts were carried out.Finite element simulation models of quenching and stress-relieving annealing were established to obtain the evolution of residual stress in the heat treatment process of pure copper plane parts.A prediction model of machining deformation of pure copper thin-walled parts was established.The residual stress distribution and deformation caused by the release of residual stress were predicted by removing the machining allowance of pure copper flat parts with the method of life and death element.The turning experiment of pure copper thin-walled parts was carried out,and the simulation model was verified by analyzing the experimental results.Combined with the experimental and simulation results,the new heat treatment process proposed in this paper can control the symmetrical residual stress in the thickness direction of pure copper plane parts,and reduce the processing deformation of pure copper thin-walled parts compared with the traditional stress relief annealing...