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Three factors of bearing failure
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| Time：2016.09.05 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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1 contact fatigue failure
Contact fatigue failure is the failure of bearing working surface under the action of alternating stress. Contact fatigue spalling in sliding bearing surface, often accompanied by fatigue crack, first from the contact surface following the maximum alternating shear stress, and then extended to the surface to form different flake shapes, such as dot peeling or pitting corrosion, shallow spalling in the peel into small flakes. Due to the gradual expansion of the peeling surface, and often to the deep expansion, the formation of deep peeling. Deep peeling is the source of contact fatigue failure.
The failure of 2 clearance change
Bearing at work, due to external or internal factors, so that the original clearance change, reducing the accuracy and even lead to "bite" called clearance change failure. External factors such as excessive interference, the installation is not in place, the temperature rise caused by the amount of expansion, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state are mainly caused by the failure of the clearance change.
3 wear failure
Wear failure refers to the relative sliding friction between the surface of the work surface and the failure of the metal. Continuous wear will cause damage to the bearing parts, and ultimately lead to the loss of sliding bearing size and other related issues. Wear may affect the shape change, increased clearance and surface morphology changes may affect the lubricant or it reaches a certain level of pollution caused by lubrication completely lost, thus bearing the loss of rotational accuracy and not normal operation. Wear failure is one of the common failure modes of all kinds of bearings, which can be divided into the most common wear and adhesive wear.
First of all, the structure design is reasonable at the same time with advanced, will have a longer bearing life. Bearing manufacturing generally through forging, heat treatment, turning, grinding and assembly, and other multi-channel processing. The rationality of the processing technology, advanced nature, stability will affect the life of the bearing. Which affects the quality of the finished product bearing the quality of heat treatment and grinding process, often with the failure of the bearing has a more direct relationship. In recent years, the research on the modification of the bearing working surface shows that the grinding process is closely related to the surface quality of the bearing.
The metallurgical quality of bearing materials was the main factor affecting the early failure of rolling bearing. With the progress of Metallurgical Technology (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. Raw material quality factors in the bearing failure analysis of the proportion has decreased significantly, but it is still bearing failure is one of the main factors.
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