Insert ball bearing failure reason analysis

Insert ball bearing failure analysis, in order to improve the working reliability of system engineering is an important part of the bearing surface, Bearing job functions in the loss of its rules, lead to failure or does not work as failure phenomenon called ( Bearing fault can be divided according to their normal life, failure and premature failure of the two, it mainly for pitting corrosion and fatigue cause of bearing early failure analysis and put forward Suggestions for improvement, in order to improve the bearing life and reliability. Microscopic analysis is the most common, the most popular methods in fracture analysis, optical metallographic analysis and hardness test. The content of the analysis should include: ( 1) Raw material material is in accordance with the standards and design requirements. ( 2) Insert ball bearing parts matrix organization and heat treatment quality meets the standard requirements. ( 3) Surface decarburization layer organization exists, austenite and other surface processing metamorphic layer. ( 4) Measurement of carburized layer and multilayer metal surface strengthening layer organization such as the depth, the shape and depth of corrosion pit or crack, and according to the shape of the defect and on both sides of the organizational characteristics determine the causes of cracks and properties. ( 5) According to the grain size, deformation and partial transformation, recrystallization, phase gathered and deformation degree, temperature, material type and the technological process, etc. ( 6) Measurement, matrix hardness, hardness uniformity of surface hardness and the hardness of the failure characteristics of the change. ( 7) Fracture observation and analysis. Scanning electron microscope (sem) for has a large depth of field, the advantages of high magnification, clear image, observation of the fracture and qualitative, measure the superiority. ( 8) Electron microscope, probe and electron energy spectrum in source and fatigue crack source analysis can detect fracture foreign body composition, found the cause of the nature of the fracture surface and fracture. On the surface, or from the surface of the crack, the two objectives ( Part carburizing, quenching and other surface heat treatment, if after have uneven hardness, organization, and the internal stress of non-uniform and other adverse, the contact stress is generally have the opposite under the influence of ground fissure, if parts surface quality is poor, there is a defect ( Oxidation and decarburization) Poor lubrication, friction or from the surface crack.