Effects Of Rolling Parameters And Curvature Coefficient On Fatigue Life For Deep Groove Ball Bearings

Structure of deep groove ball bearings is simple, convenient to use, which is the largest production lot and the most widely used of a class of bearings. Fatigue life is a comprehensive reflection of the quality of bearings. However, bearing working condition is complex, bearing test is difficult to accurately simulation, and test cycle is very long, and experimental data be obtained slowly. To solve the above problems, the article regards deep groove ball bearings as the research object, from its design view, through the finite element simulation, analyze effects of the number of rollings of bearings, rollings diameter and curvature coefficient of inner and outer race on contact stress and deformation, and influence a combination of factors on fatigue life based on numerical simulation.Based on Hertz Contact Theory of bearings, contact area is setted reasonable, its meshes is local regional refinement and the creation of contacts, according to the actual bearings working condition, impose reasonable boundary conditions, application of ANSYS Parameter Design Language APDL establish a deep groove ball bearing three-dimensional finite element analysis model. Considering the number of rollings of bearings, rollings diameter and curvature coefficient of inner and outer race and other factors, the deep groove ball bearings for finite element analysis, effects of various factors on the bearing contact stress and deformation. Its results are compared with Hertz Theory results,in order to ensure that the finite element model and analysis of the calculated bearing contact stress are reasonable, which provides necessary contact stress results with the fatigue life simulation.In terms of numerical simulation of the fatigue life, the article taken into account the number of rollings of bearings, rollings diameter and curvature coefficient of inner and outer race and other factors, using the nominal stress method for fatigue life of deep groove ball bearing through numerical simulation.With the help of ANSYS software fatigue analysis module, the fatigue life of bearing is simulated, obtain the influence discipline of various factors on the bearing fatigue life, the results with the theoretical fatigue life of L-P results are compared, and discuss difference reason between the two results; finally it propose technical measures to improve bearing life.Above study can be found, the main factors of affecting bearing life are the number of rollings of bearings, rollings diameter and curvature coefficient of inner and outer race,and so on. The results show:fatigue dangerous parts of deep groove ball bearings appear into rollings and raceway contact point; bearings fatigue life will increase when the number of rollings increase; fatigue life will increase when rollings diameter increase; fatigue life will increase when inner and outer curvature coefficient is fi≤0.51, fe≤0.515, and its will decrease wheny fi≥0.51,fe≥0.515. Simulation method of fatigue life of deep groove ball bearing can simulate the complexed working conditions of bearing,predicting fatigue life have high reliability.