| With the development of global electrification,the demand for high performance and long life motors is increasing day by day.However,the bearing erosion caused by the internal current of the motor seriously affects the durability and safety of the motor.In order to solve this difficult problem,ceramic coating insulation bearing came into being.Ceramic insulation coating can effectively prevent the current passing through the bearing,and then prevent the occurrence of electrical erosion.The grinding technology of bearing ring ceramic insulation coating is one of the key technologies in the manufacturing technology of insulating bearing.In this paper,the grinding mechanism of alumina based ceramic coating is studied by means of simulation and experiment,and the processing technology suitable for alumina based ceramic coating is explored.The specific research contents are as follows.(1)Based on the analysis of the key process parameters involved in the grinding process,combined with the relevant theoretical knowledge of fracture mechanics,considering the change from brittle removal to ductile removal of ceramic coating materials,the simulation and experimental research scheme is designed.(2)According to the morphology of the protruding part of the grinding wheel surface,the shape of the single abrasive is determined as a pyramid with a small plane at the top,and the single abrasive cutting simulation model is established.Based on the principle of single variable,the simulation experiment parameters are designed,and the finite element simulation of single abrasive scratch process is carried out.The effects of cutting speed and cutting depth on material removal form,material subsurface damage and cutting force are studied,and then the laws of material chip formation and subsurface damage under different parameters are analyzed.(3)Based on the principle of single variable,a single-particle scratch experiment is designed.By comparing scratch shapes at different cutting depths and cutting speeds,the effect of cutting speed and cutting depth on scratch quality is clarified.Based on the results of the single-particle experiment,two sets of diamond grinding ceramic coating orthogonal experiments of rough grinding and fine grinding are designed.Based on the surface roughness after processing,the degree of influence of each processing parameter on the surface quality of the workpiece is determined by extremely poor analysis.This paper is guided by exploring the high surface quality processing process of aluminabased ceramic coating,taking critical cutting thickness as the entry point,and studying the effect of grinding parameters on the grinding effect of alumina-based ceramic coating by means of single-factor single-grain scratching experiment and diamond grinding wheel orthogonal grinding experiment.The conclusion of the study provides a reference for the high-precision,low-damage grinding process of alumina-based ceramic coating. |
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