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KOYO bearing failure three factors  

2013-09-26 10:57:17|  分类: 技术 |  标签: |举报 |字号 订阅

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A contact fatigue failure
    Contact fatigue failure is KOYO bearings surface by alternating the role of stress arising from failure . Sliding contact fatigue spalling occurs in the bearing surface , often accompanied by fatigue crack , the first contact surface from the following maximum shear stress generated at alternating , extend to the surface and then peeled off to form different shapes , such as point -like as pitting or peeling pitting , peeling said sheet into small shallow peeling. Since the gradual expansion of the surface spalling , and often extended to the deep , forming deep peeling. Deep contact fatigue spalling is the source of fatigue failure .
2 clearance changes fail
      KOYO bearings at work, due to external or internal factors, with the gap so that the original change , reduced accuracy , and even lead to " bite " is called clearance changes fail . External factors such as excessive interference , installation not in place , the temperature rise caused by the amount of expansion , instantaneous overload , internal factors such as residual austenite and residual stresses in an unstable state and so is the resulting change in clearance causes of failure .
3 wear failure
   Wear failure refers to the relative sliding friction between the surface of metal surface thereby causing the failure generated constant wear and tear . Continuous wear will cause damage to the bearing parts gradually , and eventually lead to loss of dimensional precision bearings and other related issues. Wear may affect the change in shape , with the gap increasing and working surface morphology changes that may affect the lubricant, or it reaches a certain level of pollution caused by lubrication complete loss of function , thereby bearing the loss of rotational accuracy and even can not operate normally . Kinds of bearing wear failure is a common failure modes, can generally be divided according to wear the most common form of abrasive wear and adhesive wear.
First, the structural design is reasonable , while there have advanced, will have a longer bearing life. KOYO bearings are generally manufactured through forging , heat treatment, turning, grinding and assembly of multi- channel processing . The reasonableness of the processing technology , advanced, will also affect the stability of the bearing life . Which affect the quality of the finished bearing heat treatment and grinding processes, often with bearing failure have a more direct relationship. In recent years, the bearing surface bearing metamorphic layer studies show that the quality of the grinding process and is closely related to the bearing surface .
KOYO bearing materials metallurgical quality of early bearing failure of the main factors . As metallurgical techniques ( such as bearing steel vacuum degassing, etc. ) progress, improve the quality of raw materials . Raw material quality factors bearing failure analysis in the proportion has decreased significantly, but it is still bearing bearing failure is one of the main factors .

来源http://www.worldsbearings.com/

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