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Rolling Block Failure injury exclusion maintenance

Author:   Date:2013/10/19
Rolling Block material 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 . First, the structural design is reasonable , while there have advanced, will have a longer bearing life. Rolling Block manufacturing generally 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 . Raw material quality factors in bearing failure analysis in the proportion has decreased significantly, but it is still bearing failure is one of the main factors .
● contact fatigue failure
Rolling contact fatigue failure is the work surface seat role by alternating 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 .
● 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.
● Failure clearance changes
Rolling Block 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 .
By Rolling Block faults and deterioration , performance status parameters to determine and predict the reliability of rolling seat and performance , the site of the abnormal situation , causes and degree of risk identification and judgment to decide restoration and improvement of the integrated technology . Therefore , bearing seat fault diagnosis technology is not simply fault detection ( or monitoring ) technology , nor is it a simple point inspection instrumentation . Correctly , quickly and effectively signal acquisition , data processing , manual or automatic identification and judgment. In order to determine the scientific repair cycle , the mechanism should be based on various types of failure , fatigue , wear life tests and estimates necessary .
Rolling Block fatigue failure is a failure surface forms , mainly for fatigue crack initiation, propagation and fracture processes in alternating load faults arising under long-term effects of the metal. Cracks in two ways:
1 , on the surface , which is in rolling contact bearing pedestal process, due to the work surface of the plastic deformation and strain hardening surface contact stress caused by cyclical changes in the role of external loads , and finally in the small cracks from developing the inner surface , in between the formation of surface cracks , wedged into the surface as a result of lubricant power open to crack down on the wall , forcing the forward crack ;
2, from the surface layer, again under the pressure of the contact surface , the first surface of the exposed areas of cracks cracks certain depth and angle of the direction along the surface to a certain depth from the surface of the contact surface, and beyond surface , and eventually the formation erosion stripped , leaving a Makeng .
From the bearing seat surface, or from cracks in the surface layer , these two goals ( parts carburizing , quenching and other heat treatment of the surface , and if it has uneven hardness , organizations, and non- uniform stress and other negative , the contact stress is generally the opposite of the underground cracks from the impact , if the part surface quality is poor, there is a defect ( oxidation and decarbonization ) , friction or poor lubrication , the surface cracks. raceway sound control methods are : selection of low-noise rolling bearing Block that waviness small bearing seat , carefully selected conditions of use. raceway sound often affect the entire mechanical noise reduction raceway sound can reduce the overall mechanical noise.

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