Bearing failure analysis method (2)

Source: China Bearing Network Time: 2018-06-02

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2. Microscopic view of the microscopic view of the failed bearing (including the measurement of the measurement and appearance of the scale public service); is the most important part of the failure analysis. The overall appearance of the view; can know the outline of the bearing failure and the characteristics of the damaged part; Reasons; investigate the size, shape, location, quantity and characteristics of the shortcomings; and intercept the appropriate parts for further microscopic viewing and analysis. The microscopic views include:
(1) Change of shape and scale (including vibration analysis, dynamic function analysis and raceway roundness analysis).
(2) Change in the clearance.
(3) Whether there is corrosion appearance; in the sputum area; it is the type of corrosion; can be directly related to failure.
(4) Can there be cracks; the shape of the crack and the nature of the fracture.
(5) Wear is a type of ;; how effective it is for failure.
(6) Investigate the condition and location of the external discoloration of the bearing parts to determine its smooth condition and appearance temperature effect.
(7) The main investigation of the failure feature area is to investigate the abnormal wear, foreign particle embedding, cracks, scratches and other shortcomings.
(8) Cold pickling or hot pickling to check the original appearance of the bearing parts for soft spots, decarburization layer and burns; especially for surface grinding burns.
(9) Using X-ray stress measurement equipment to measure the stress change before and after bearing operation.
The results of the microscopic review; sometimes the way and cause of failure can be fundamentally identified; but the nature of the failure must be further determined; more basis must be obtained; microscopic analysis is done.
3. The microscopic analysis of the microscopic analysis of the failed bearing includes optical metallographic analysis, electron microscopy analysis, probe and electron energy spectrum analysis, etc. The first is based on the microscopic arrangement of the failure feature area and the analysis of the fatigue source and crack source for the failure analysis. More abundant criteria or counter-evidence. The most common and most common method in micro-analysis is optical metallographic analysis and external hardness testing. The content of the analysis should include:
(1) Whether the quality of the data can meet the relevant norms and depicting needs.
(2) The basic arrangement of the bearing parts and the quality of the heat treatment can meet the relevant requirements.
(3) Whether the surface layer can be decarburized, torsite and other external processing enthalpy layers.
(4) Measure the depth of the outer layer of the carburized layer and the layers of the multilayer metal; the shape and depth of the corrosion pit or crack; and determine the cause and nature of the crack according to the shape of the crack and the characteristics of the two sides.
(5) Discriminating the degree of deformation, temperature rise, data variety and process progress according to grain size, arrangement deformation, partial phase transformation, recrystallization, phase collection, etc.
(6) Measuring the hardness, hardness uniformity and hardness change of the failure zone.
(7) Fracture investigation and analysis. Qualitative analysis and measurement of fractures with scanning electron microscopy.
(8) Electron microscopy, probe and electron spectroscopy can measure the composition of the fracture in the analysis of the source of fatigue and the source of the crack; the nature of the fracture and the cause of the crack are found.
The three processes of the above-mentioned analysis of bearing failure analysis are a process of gradual deepening from the outside to the inside. The details of each process should be based on the type and characteristics of the bearing failure; depending on the detailed situation; but the analysis process is Indispensable. And throughout the profiling process; the results of the analysis should always be linked to many factors affecting bearing failure; inductive thinking.

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