What is the cause of the slow roller bearing failure?

What is the cause of the slow roller bearing failure? 2018 - 11 - 21 usually bearing failure in general performance: contact fatigue failure. The formation process and the consequences are: pitting & rarr; Pitting flake & rarr; Shallow flaking & rarr; Deep spalling. The wear failure. The formation process and the consequences are: wear & rarr; The shape change & rarr; Fit clearance increases and the working surface change & rarr; Lubricant pollution & rarr; Lubrication function loss & rarr; The loss of bearing rotation accuracy. The fracture failure. Two factors influence mainly by overload and defects. Overload fracture happens when load than ultimate strength. Bearing parts of micro crack, shrinkage cavity, bubbles and large foreign impurities, overheating organizations and local burns and other defects during the impact overload or violent vibration will cause fracture in defect. Bearing clearance change failure. By internal and external factors work together to cooperate clearance change, causing the bearing accuracy is reduced, so that 'killed' phenomenon. External mainly refers to the large amount of interference, installation does not reach the designated position, cause instantaneous overload expansion amount, temperature, etc. ; Internal factors are mainly the residual austenite and the residual stress in the unstable state, etc. Tapered roller bearing losses may be the cause of bearing quality problem; Bearing assembly problem; Sealed with problems or damage, into ashes.