Simulation And Experimental Research On Internal Grinding Temperature And Surface Residual Stress Of GCr15 Steel

GCr15 steel has a high carbon content and is a commonly used bearing ring steel material in the industry.Its processing performance and performance are superior to other steels.After heat treatment,the hardness is high,the structure is uniform,the wear resistance is strong,and the contact fatigue is high.70% of the bearing rings are made of GCr15 steel.Precision grinding is the most critical part of the manufacturing process of bearing rings,which seriously affects the machining accuracy and service life of rings.In order to achieve high-quality grinding of bearing rings,this article takes GCr15 steel internal grinding as the research object,combined with finite element simulation and experimental methods,in-depth study of the grinding process parameters of grinding process on grinding heat and residual stress The influence mechanism and evolution law of it provide a scientific basis for seeking accurate and reasonable monitoring and control of thermal damage and residual stress process measures,and improving the internal grinding process of bearing rings.The research work mainly includes:Firstly,this paper designs a three-factor four-level orthogonal experiment program to study the change law of the inner circle grinding temperature of the ring and the residual stress on the workpiece surface;in order to detect the inner circle grinding temperature of the bearing ring,an inner circle wireless thermoelectricity is built An experimental platform for dual temperature measurement;at the same time,in order to detect the residual stress of the internal grinding of the ferrule,an experimental scheme for measuring the residual stress of the internal grinding of the ferrule was designed by the blind hole method.Secondly,this article explains the theoretical basis of the thermal analysis and structural analysis process of grinding and the basic theory of thermal analysis and stress analysis finite element method.In Ansys finite element software,the GCr15 steel ferrule is parametrically modeled based on APDL,based on The moving triangle heat source model with constantly changing heat flux size and direction performed a finite element simulation of the internal grinding temperature of the ferrule;subsequently,based on the finite element simulation of the internal grinding temperature of the ferrule in a sequential coupling manner,the transformation Type of analysis.Coupling the analysis results of the temperature field withthe external force load to realize the finite element simulation of the residual stress on the workpiece surface of the internal grinding of the ferrule.Finally,based on the high-precision end surface internal grinder,this paper carried out experiments on the internal grinding temperature of the ferrule and the residual stress on the surface of the workpiece,and discussed and analyzed the influence of different grinding process parameters on the grinding temperature.The angles of the compressive stress and the tensile stress generated by the grinding temperature analyze the influence mechanism of the grinding wheel speed,workpiece rotation speed,and grinding depth on the residual stress.The simulation and experimental results are compared and analyzed respectively,which verifies the rationality of the finite element simulation,and puts forward the optimization strategy of the ferrule grinding process aiming at the workpiece grinding temperature and residual stress control,and the optimal decision-making method of internal grinding with the goal of grinding efficiency and quality.