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Analysis of the characteristics of the self aligning ball bearing fault
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| Time：2017.12.05 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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The production of oil free self aligning ball bearing is popular through forging, heating, turning, grinding, and assembling processes. The rationality, progressiveness and stability of each processing technology will also affect the life of self aligning ball bearing. The heating and grinding processes that affect the quality of the self aligning ball bearing are often more directly related to the failure of the self aligning ball bearing. In recent years, the study of the surface metamorphic layer of self aligning ball bearing indicates that the grinding process is closely related to the surface quality of self aligning ball bearing.
Self aligning ball bearingself aligning ball bearing showed late fault features to a serious failure (usually self aligning ball bearing damage such as axle, burn, sand spallation, raceway, wear beads etc.) most of the time not more than a week, equipment capacity larger, higher speed, shorter intervals. Therefore, in the actual self aligning ball bearing fault diagnosis, once we find the characteristics of late fault, we should make a decisive judgement that there is a fault in the compound self aligning ball bearing, and arrange for maintenance as soon as possible.
After a period of time, the vibration and noise are maintained to a certain level, the frequency spectrum is very single, only one or two frequency doubling. Less than three times the frequency spectrum of the power frequency, the complex self aligning ball bearing state is very stable, entering the stable working period. After running into operation, the vibration and noise of self aligning ball bearing began to increase, sometimes abnormal sounds appeared, but the vibration increased slowly. At this time, self aligning ball bearing kurtosis began to reach a certain value suddenly. We think that at this time self aligning ball bearingself aligning ball bearing shows an initial failure.
Self aligning ball bearing showed late fault features to a serious failure (usually self aligning ball bearing damage such as axle, burn, sand spallation, raceway, wear beads etc.) most of the time not more than a week, equipment capacity larger, faster the speed, the interval time is short. Therefore, in the actual self aligning ball bearing fault diagnosis, once we find the characteristics of late fault, we should make a decisive judgement that there is a fault in the compound self aligning ball bearing, and arrange for maintenance as soon as possible.
The periodical temperature measurement of self aligning ball bearing can be used for thermometer, such as digital thermometer. It can accurately measure self aligning ball bearing temperature and display it at unit temperature or Fahrenheit.
1, wear failure
Wear failure refers to the failure of the relative sliding friction between the surface of the surface leading to the continuous wear of the working surface of the metal. Constant wear will cause self aligning ball bearing parts to be damaged gradually, and eventually lead to the loss of dimensional accuracy of sliding self aligning ball bearing and other related problems. 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 complete loss of function, so that the self aligning ball bearing the loss of rotational accuracy and not normal operation. Wear failure is one of the common failure modes of all kinds of self aligning ball bearing, which can be divided into the most common abrasive wear and adhesion wear in the form of wear.
2. Contact fatigue failure
Contact fatigue failure refers to the failure of the working surface of self aligning ball bearing under the action of alternating stress. Contact fatigue spalling in sliding self aligning ball bearing the work 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 flaking surface, it tends to expand to the deep, forming deep exfoliation. Deep exfoliation is the fatigue source of contact fatigue failure.
3. fracture failure
The main cause of fracture failure of self aligning ball bearing is the two major factors of defect and overload. When the load exceeds the limit of the strength of the material, the fracture of the part is called overload fracture. The main cause of overload is the failure or improper installation of the main engine. Sliding self aligning ball bearing parts such as micro cracks, shrinkage pores, bubbles, large external debris, superheat tissue and local burns and other defects will also cause breakage at the defect when subjected to impact overload or severe vibration, which is called defect fracture. It should be pointed out that sliding self aligning ball bearing still needs to strengthen control in the manufacturing process, such as incoming inspection, forging and heat treatment, quality control and process control. But generally, most of the usual fracture failures of self aligning ball bearing are overload failure.
4. gap change failure
Sliding self aligning ball bearing in the work, due to the influence of external or internal factors, makes the original matching gap change, the accuracy is reduced, and even cause "bite dead", called the clearance change failure. External factors such as interference volume are too large, installation is not in place, temperature expansion caused by expansion and instantaneous overload, internal factors such as residual austenite and residual stress in unstable state are all the main reasons for the failure of clearance.
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