Three factors - bearing NSK bearings failure knowledge

by:Waxing     2020-05-30
1 contact fatigue failure NSK bearing working surface contact fatigue failure is caused by the effect of alternating stress and failure. Contact fatigue spalling occurred in sliding bearing working surface, often accompanied by fatigue crack, first of all, from the maximum cyclic shear stress under contact surface, and then extended to form a different flake shape, such as dot to pitting corrosion or pitting spalling, peel into small sheet according to the shallow flaking. Due to spalling surface expands gradually, and often to deep extension, forming deep spalling. Deep spalling is contact fatigue failure of fatigue source. 2 NSK bearing clearance change failure at work, because of the influence of the external or internal factors, change the original fit clearance, lower accuracy, and the change of 'killed' called clearance failure. , large amount of the external factors such as interference of installation does not reach the designated position, temperature rise caused by the expansion, instantaneous overload, etc. , internal factors such as residual austenite and the residual stress in a state of flux and so on all is the main reason for the failure caused by clearance changes. 3 wear failure wear failure refers to the relative sliding friction between the surface lead to constant wear and tear of the working surface of the metal, resulting in failure. Continuous wear will cause bearing parts damaged gradually, and ultimately lead to sliding bearing size accuracy loss and other related problems. Wear may affect the shape change, the increase of fit clearance and working surface morphology change, may affect the lubricant or make its pollution to a certain degree of lubrication function is lost, so that loss of bearing rotating accuracy and will not operate properly. Wear failure is one of the common failure modes of all kinds of bearings, according to the wear and tear is usually divided into one of the most common form of abrasive wear and adhesive wear. First of all, reasonable structure design and equipped with advanced, just can have a long bearing life. NSK bearings manufacturing generally go through forging, heat treatment, cutting processing, grinding and assembly process. The rationality of the processing technology, advanced, stability will also affect the service life of bearing. Which affects the quality of finished products bearing heat treatment and grinding process, tend to have a more direct relationship with bearing failure. Bearing in recent years the study of metamorphic layer of bearings working surface show that the grinding process and is close to the surface quality of the bearing. NSK bearing materials of metallurgical quality were the main factors influencing the premature failure of the rolling bearing. As metallurgy technology, For example, the bearing steel vacuum degassing, etc. ) Progress, raw material quality is improved. Raw material quality factor in the bearing failure analysis share has declined obviously, bearing but it is still one of the main influence factors of bearing failure.
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