Simulation Study On Residual Stress Of Cr12MoV Surface In Dry Hard Turning

The processed metal surface is accompanied by high deformation of plastic at the influence of high temperature,high pressure and high strain rate in the dry hard turning,which will produce great residual stress on the surface of the workpiece,and has great influence on the working performance and fatigue life of the workpiece.It's a complex process influenced by multiple factors to the formation of residual stress on the machined surface,and different cutting parameters,different material hardness will affect the formation and distribution of residual stress.In order to reveal the generation and distribution of residual stress,it is necessary to analyze and study the different influencing factors with the theory and experiment.However,it requires multiple experiments to collect data for comparative analysis in the dry hard turning experiment,which is a very large cost to the tool and the workpiece material consumption.With the extensive application of finite element method in metal cutting and residual stress modeling simulation,it is not only saving costs,saving time and effort,but also possesses a strong performance with a high reliable data,which has a high reference value using ABAQUS finite element analysis software to simulate the experiment.Residual stress is an important indicator to the quality o f processed surface,studying and revealing the generation process and distribution discipline of residual stress deeply,can provide an important theoretical basis for rational selection of cutting parameters and improving the surface quality of the workpiece.This paper simulated by finite element analysis to the residual stress of Cr12 Mo V surface,revealed the influence mechanism with different influence factors on the residual stress from the workpiece surface,and proposed the optimal cutting program.As follows there are main contents and results:?1?Performed the SHPB experiment,calculated the parameters of A,B,C,m and n corresponding to different hardened states of Cr12 Mo V materials according to the experimental data and the Johnson-Cook constitutive equation,also established the dry hard turning model of PCBN tool cutting Cr12 Mo V by using ABAQUS finite element simulation software.?2?Performed the finite element simulation experiment of dry hard turning Cr12 Mo V with single factor orthogonal test design method,analyzed and revealed the influence rules of different materials hardness and different cutting parameters on the residual stress of machined surface.?3?Analyzed and proposed the optimization program of different cutting parameters through the multi-factor orthogonal experiment design,and verified the optimization results by the dry hard turning experiment finally.The results of the study indicate that: there are all residual compressive stress in the surface depth of 0 0.16 mm with dry hard turning Cr12 M o V,and with the depth of the workpiece surface increases,the residual compressive stress gradually increased firstly,then gradually reduced,finally close to 0;In the five different influencing factors,the residual compressive stress of the machined surface all gradually increases with the increase of the hardness of the workpiece hardness,the back cutting depth or tool rear angle,and the residual compressive stress all gradually decreases with the increase of cutting speed or tool front angle;In the four different influencing factors of cutting parameters,the affect primary and secondary order to the residual stress is as follows: the tool rear angle is the largest,the back cutting depth followed,the cutting speed third,the tool front angle is the least;The optimal combination of four different cutting parameters is: the cutting speed v = 400 m·min-1,the back cutting depth (6= 0.20 mm,the tool front angle ?₀ =-5°,the tool rear angle ?₀ =10°.