Contact fatigue failure refers to the failure caused by alternating stress on the working surface of IKO imported bearing. 接触疲劳剥落发生在轴承的工作面上，常伴有疲劳裂纹.
It first occurs from the large Imported Bearing Iko alternating shear stress below the contact surface, 然后延伸到表面形成不同的剥落形状, 例如点蚀或点蚀剥落, 这称为浅剥落.
由于剥落面逐渐扩大, it often Imported Bearing Iko expands to the deep layer, 形成深度剥落. 深度剥落是接触疲劳失效的疲劳源.
持续磨损会导致轴承零件逐渐损坏, and eventually lead to the loss of dimensional accuracy of IKO imported bearings and other related problems. 磨损可能会影响形状的变化, 配合间隙的增加和工作表面形貌的变化,
可能会影响润滑剂或使其受到一定程度的污染, Imported Bearing Iko resulting in the complete loss of lubrication function, 使轴承失去转动精度，甚至不能正常运转.
磨损失效是各种轴承常见的失效模式之一. Imported Bearing Iko According to the wear form, 可分为普通磨粒磨损和粘着磨损.
1) Instrument detection
It is only a convenient and reliable method to judge the running state of the bearing and whether it Imported Bearing Iko should be maintained or replaced by using a Ferrograph or SPM or a new vib05 detector.
例如, when using vibo5 detector, which is a newly designed machine state detection instrument based on microprocessor, it has the functions of vibration detection, IKO imported bearing state analysis and infrared temperature measurement.
It is easy to operate and Imported Bearing Iko automatically indicates the state alarm. It is very suitable for on-site equipment operation and maintenance personnel to detect the state of the equipment, find problems in time and ensure the normal and reliable operation of the equipment.
Using such an instrument can make full use of the working Imported Bearing Iko potential of the bearing, guarantee the bearing in time, 并避免故障. It is more suitable for young workers to make up for their lack of experience.
2) Manual detection
In places where the above instruments are not available, monitoring tools modified by equipment similar to medical stethoscope can be used for detection.
Experienced operators can also use tools such as round rods or wrenches to collide with the parts of the machine shell close to the bearing and use their ears to monitor the running sound of the bearing through the tools.
The normal running sound of IKO inlet shaft should be uniform, Imported Bearing Iko stable and not harsh, while the abnormal bearing running sound is intermittent, impact or harsh.
This method is suitable for experienced staff to operate, Imported Bearing Iko which mainly depends on the accumulation of staff experience.
1. Grease lubrication
The re lubrication of SKF Bearing is carried out during the planned equipment shutdown and supplemented regularly. 同时, the old grease is removed or squeezed out through the oil drain air.
Wipe the grease nipple clean before adding fresh grease. If there is no grease nozzle in the bearing box, open the bearing box cover or end cover to take out the old grease. After cleaning, add fresh grease of the same model.
2. Lubricating oil lubrication
Regularly check the oil level and quality of lubricating oil. 一般来说, the normal oil level should be within 1 / 3-2 / 3 of the equipment oil level window or mark. The oil replenishment mode is the oil cup,
and the displayed oil level only represents the oil replenishment capacity, while the oil level of the bearing box meets the operation requirements. If the oil level in the oil cup is lower than 1 / 4 of its total volume, oil replenishment can be considered.
Check and replenish oil methods. Take a small amount of lubricating oil as a sample and compare it with fresh lubricating oil. Competent units can consider oil quality test to ensure that the oil quality is qualified.
If the sample looks like a cloud, it may be the result of mixing with water, which is often called oil emulsification. 此时, the lubricating oil should be replaced.
If the sample becomes darker or thicker, it may indicate that the lubricating oil has begun to carbonize, and the old lubricating oil should be completely replaced. If possible, flush the oil circuit with fresh lubricating oil.
When replacing the lubricating oil, ensure that the new and old models of the replaced lubricating oil are the same, and supplement it to meet the required oil level.
Use the oil bath lubrication system. If the oil temperature is below 60 ℃ (140 ° f) and the lubricating oil is not polluted, replace the lubricating oil once a year. If the oil temperature is 60-100 ℃ (140-210 ° f),
the lubricating oil needs to be changed four times a year. If the oil temperature is 100-120 ℃ (210-250 ° f), the lubricating oil needs to be changed once a month. If the oil temperature is above 120 ℃ (250 ° f), the lubricating oil needs to be changed once a week.
Correct installation and maintenance is an important factor for the normal operation of SKF Bearing. 同时, attention must be paid to maintaining the cleanliness of the bearing. The bearing must be protected from contamination by pollutants and moisture, and must be correctly installed and lubricated.
此外, the design of bearing arrangement, the condition of oil seal, the form and replacement cycle of lubricant and special maintenance also play an important role, 这是必须注意的.
Common faults of imported bearings are as follows:
1. Tile surface corrosion: abnormal concentration of non-ferrous metal elements is found by spectral analysis; Submicron wear particles with many non-ferrous metal components appear in ferrography; The water content and acid value of lubricating oil exceed the standard.
2. Journal surface strain: there are ferrous cutting abrasive particles or black oxide particles in the ferrogram, and there is tempering color on the metal surface.
3. Journal surface corrosion: the spectral analysis found that the concentration of iron was abnormal. There were many submicron particles of iron in the ferrogram, and the water content or acid value of lubricating oil exceeded the standard.
4. Surface strain: cutting abrasive particles are found in the Ferrograph, and the abrasive particles are composed of non-ferrous metals.
5. Fretting wear of tile back: abnormal iron concentration is found by spectral analysis. There are many iron components, submicron wear particles, abnormal moisture and acid value of lubricating oil in the ferrogram.
Under the condition of liquid lubrication, the sliding surface is separated by the lubricating oil without direct contact, which can also greatly reduce the friction loss and surface wear, and the oil film also has a certain vibration absorption ability