Thermodynamic Analysis And Thermal Deformation Research Of Laser Cladding Rotor Shaf

As a commonly used component in the mechanical industry,the rotor shaft is usually used as a support for transmitting torque,and needs to withstand large loads.In order to ensure the stability and reliability of the rotor shaft during operation,it is necessary to improve the surface properties of the rotor shaft,such as hardness,wear resistance,and fatigue resistance.Laser cladding technology can strengthen and repair the surface of the rotor shaft.At the same time,laser cladding technology has the characteristics of green environmental protection and good process controllability.This article analyzes the laser cladding of the rotor shaft through a combination of numerical simulation and experimental verification,exploring the deformation laws and shape control methods of the rotor shaft during laser cladding.Firstly,numerical simulation was conducted on the rotor shaft using the ANSYS WORKBENCH platform.Establish a three-dimensional simulation model of the rotor shaft,mesh it and set boundary conditions.Secondly,combine the laser heat source model and the "life and death element technology" to simulate the additive process of laser cladding.Finally,the temperature distribution law and deformation law of the rotor shaft in the laser cladding process and the relationship between the temperature distribution uniformity of the rotor shaft in different cladding modes and its deformation were obtained through the post-processing of the results,and the cladding mode that can reduce the deformation of the rotor shaft was explored.To validate the model,this article conducted cladding experiments on the rotor shaft using a laser cladding system.The mechanical properties of the rotor shaft after cladding were tested using instruments such as Vickers hardness tester and wear friction tester.At the same time,high-precision cylindricity tester was used to measure the coaxiality of the rotor shaft,in order to characterize the deformation of the rotor shaft during cladding.Explored the improvement of rotor shaft performance and compared experimental and simulation data on rotor shaft deformation to verify the reliability of the simulation results.The research results show that the temperature of the rotor shaft in laser cladding will gradually increase due to the existence of heat accumulation,but the increase is small.The deformation of the rotor shaft will gradually increase in the direction away from the cladding area.However,with the reduction of the rotor shaft cladding pitch,the axial cladding width will increase,the laser irradiation duration will extend,and the total heat input by the laser will increase.The temperature distribution of the rotor shaft in the process of laser cladding will become more uniform,The uniformity of temperature distribution is getting better and better,and the deformation of rotor shaft in laser cladding gradually decreases from110.37μm.Reduce m to 74.22μm;Through hardness testing and wear resistance testing,it was found that the overall hardness of the cladding layer is above 650 HV,and its hardness value is more than three times higher than the 210 HV of the substrate;The stable friction coefficient of the substrate is 0.495,and the stable friction coefficient of the cladding layer is 0.355,which is71.7% of the stable friction coefficient of the substrate.The weight loss of the substrate reaches 0.589 mg,while the weight loss of the cladding layer is only 0.21 mg,which is 37% of the substrate wear amount,improving the wear resistance by 2.7 times.The research results of this article have important guiding significance for the repair and strengthening of rotor shafts.