Research Of Grinding Residual Stresses Of Spiral Bevel Gear Based On Thermo-mechanical Coupling

Spiral bevel gear has the advantages of good stability, high reliability,strong bearing capacity, wear resistance, compact structure, low noise and many other advantages, so it widely used in national defense and military industry, aerospace, petroleum chemical industry, mechanical engineering and other fields,and the processing quality is requested Strictly,and its NC grinding method is widely used in its precision machining. This paper based on the thermo mechanical coupling, research on the grinding residual stress of spiral bevel gear, and the main research contents are as follows.Study on the NC grinding method and mechanism and the mathematical model of the characteristic parameters of spiral bevel gear.According to the Gleason contact principle, the mathematical models of basic grinding parameters were established; The heat distribution ratio was gotten by using Guo’s thermal model of a single grinding grit,the heat flux was obtained by applying a rectangle distributing heat source,through the grinding mechanism analysis, the formulas of grinding forces were founded.Experimental and finite element simulation analysis of thermal-mechanical coupling of grinding of Spiral bevel gear. The 3D single tooth model of spiral bevel gear was built by applying the finite element method. Application to the theories of heat conduction and the thermo-elastic-plastic, the grinding temperature field of spiral bevel gears was simulated and verified by experiment. Based on the temperature field,the grinding stress field of the spiral bevel gear was Analysed and verified by test.Study on the grinding residual stresses of spiral bevel gears. Based on the thermo-mechanical coupling, the grinding residual stresses of spiral bevel gear were simulated, and its change laws with parameters of the grinding and the cooling conditions were obtained. Through comparative analysis of the experiment, between the results of prediction and themeasured values,the maximum error of Grinding surface residual stress of spiral bevel gear is only 18.6%, and verify the accuracy of the model and the finite element method.The affecting on the tooth surface of Spiral bevel gear grinding residual stress. The effect of deformation on the tooth surface and tooth surface error analysis, the maximum deformation of the grinding center;Using metallographic microscope and automatic micro hardness grinding on tooth surfaces were studied experimentally, the Morphology and the structure of the crack of spiral bevel gear grinding can be get,the change curve and obtain the normal tooth and micro hardness of grinding crack gear with carburized layer depth in different forms. Proposed measures to eliminate the grinding residual stress.