 |
bearing for mining |
10,22,2016 |
|
bearing in mining |
10,22,2016 |
|
bearing of mining |
10,22,2016 |
|
mining bearing |
10,22,2016 |
|
mining bearing |
10,22,2016 |
|
mining bearing |
10,22,2016 |
|
bearing for mining drum |
10,21,2016 |
|
bearing for mining drum |
10,21,2016 |
|
bearing for mining drum pulley |
10,21,2016 |
|
bearing for mining pulley |
10,21,2016 |
|
| Current Location：Home
- News |
Analysis on the Factors of Bearing Fault
|
| Time：2016.11.08 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
|
Oil-free bearing manufacturing popular through forging, heat treatment, turning, grinding and assembly processes such as multi-channel processing. The processing of the rationality, advanced, stability will also affect the bearing life. Affect the bearing quality of thermal processing and grinding process, often with the bearing failure has a more direct relationship. In recent years, the deformation of the bearing surface of the study shows that the grinding process and the bearing surface quality are closely related.
Bearing bearings show late failure characteristics to a serious failure (usually bearing damage such as axle, burns, sand scattered, roller, bead wear, etc.) most of the time not more than a week, the greater the capacity of equipment, the faster speed, The shorter the interval. Therefore, in the actual bearing fault diagnosis, if the late fault features, should determine the existence of complex bearing fault, as soon as possible arrangements for maintenance.
After a period of movement, vibration and noise to maintain a certain level, the spectrum is very simple, only one or two times. Rarely more than three times the frequency spectrum, the composite bearing state is very stable, into a stable working period. After running into the use of late, bearing vibration and noise began to increase, and sometimes abnormal sound, but the increase in vibration changes more slowly, this time, the bearing kurtosis value began to suddenly reach a certain value. We believe that the bearing at this time the performance of the initial bearing failure.
Bearings show late failure characteristics to a serious failure (usually bearing damage such as axle, burns, sand scattered, roller, beads, etc.) most of the time not more than a week, the greater the capacity of the equipment, the faster the speed of its The shorter the interval. Therefore, in the actual bearing fault diagnosis, if the late fault features, should determine the existence of complex bearing fault, as soon as possible arrangements for maintenance.
The bearing temperature can be measured periodically by means of a thermometer, such as a digital thermometer, which accurately measures the bearing temperature and displays it in degrees Celsius or Fahrenheit.
1, wear failure
Wear failure refers to the relative sliding friction between the surface leading to the working surface of metal wear and tear caused by the failure. Continued wear causes gradual damage to the bearing components, resulting in loss of dimensional accuracy of the sliding bearing and other related problems. Wear may affect the shape changes, with the gap increases and changes in the surface morphology, which may affect the lubricant or to a certain degree of pollution caused by complete loss of lubrication, so that the loss of rotation accuracy of bearings and even normal operation. Wear failure is one of the common failure modes of all kinds of bearings, which can be divided into the most common abrasive wear and adhesive wear.
2, contact fatigue failure
Contact fatigue failure means that the working surface of the bearing is subject to alternating stress and failure. Contact fatigue spalling occurs at the sliding bearing surface and is often accompanied by fatigue cracks that first arise from the maximum alternating shear stress below the contact surface and then extend to the surface to form a different exfoliation shape such as point pitting or pitting , Peeling into small flakes called shallow flaking. Due to the gradual expansion of the peeling surface, and often extended to the deep, the formation of deep flaking. Deep flaking is the fatigue source of contact fatigue failure.
3. Fracture failure
Bearing fracture failure is mainly due to defects and overload two factors. When the applied load exceeds the material strength limit caused by the broken parts called overload fracture. The main cause of overload is the host unexpected fault or improper installation. Sliding bearing parts of the micro-cracks, shrinkage, bubbles, large foreign debris, overheating and localized burns and other defects in the impact of overload or severe vibration will cause defects in the fault, known as the defect fracture. It should be pointed out that the sliding bearing in the manufacturing process, the re-inspection of raw materials, forging and heat treatment quality control, process control through the instrument correctly analyze the existence of these defects in the future must still strengthen control. However, in general, the failure of bearing failure is usually the majority of overload failure.
4. Gap change failure
Sliding bearing in the work, due to external or internal factors, so that the original with the gap change, lower accuracy, and even cause "killed" called the clearance change failure. External factors such as interference is too large, the installation is not in place, the temperature rise caused by the expansion, transient overload, internal factors such as residual austenite and residual stress in the unstable state are the main reasons for the failure to change the clearance.
|
|
|
