INA needle bearing is a roller bearing with a cylindrical roller. The roller is thin and long relative to its diameter. This roller is called a needle roller. Although it has a small cross-section, the bearing still has a high load-bearing capacity, so it is especially suitable for the situation where the radial space is limited. Of course, with the popularization of this kind of bearing, how to detect and maintain it has become a big problem.
1. Oil film resistance diagnosis technology
Features: the same evaluation standard can be used for different working conditions. The results of the diagnosis of surface peeling, indentation, and crack are poor.
Application scope: it is suitable for the occasion where the rotating shaft is exposed.
2. Vibration diagnosis technology
Features: vibration diagnosis technology is widely used; online monitoring can be realized; diagnosis is fast, and diagnosis theory is mature.
Application: it is especially suitable for the fault monitoring of INA Bearing in rotating machinery.
3. Ferrography diagnosis technology
Features: the machines do not need to be disassembled; the investment is low, and the effect is excellent; the early fatigue failure of needle roller bearing can be found; the wear mechanism can be studied.
Application scope: it is suitable for the fault diagnosis of INA Bearing Lubricated with lubricating oil, and it isn't very easy for bearing lubricated with grease.
4. Temperature Diagnosis Technology
Features: the diagnosis is simple, and the effect of the judgment is sound.
Scope of application: it is suitable for a simple routine diagnosis of needle bearing in the machine.
5. Optical fiber monitoring and diagnosis technology
Features: high sensitivity of optical fiber displacement sensor; direct extraction of signal from ina bearing surface to upgrade the signal-to-noise ratio; it can directly reflect the manufacturing quality, surface wear, load, lubrication, and clearance of the bearing.
Application scope: suitable for the machine that can install the sensor in the bearing seat.
6. Acoustic emission diagnosis technology
Features: rapid and simple diagnosis, on-line monitoring.
Application scope: the new technology developed in recent years is seldom used in the condition monitoring of needle bearing.
To give full play to the needle bearing and maintain its proper performance for a long time, it is necessary to do an excellent job in regular maintenance (regular inspection). It is essential for improving productivity and the economy to find faults early and prevent accidents in advance through proper routine control.
When removing the ina bearing for inspection, first, we need to make appearance records through photography and other means. Moreover, confirm the amount of residual lubricant and sample the oil before cleaning the bearing.
a. Bearing cleaning is divided into excellent cleaning and rough cleaning. If the bearing is revolved in the oil, please pay attention to damage to the rolling surface because of foreign matters.
b. During excellent washing, slowly rotate the bearing in the oil and proceed. After cleaning, apply antirust oil on the needle bearing immediately.
To judge whether the removed ina bearing can be reused, it is important to check its dimensional accuracy, rotation accuracy, sealing ring, raceway surface, cage, internal clearance, and mating surface.
The inspection results can be judged by those who use inertia bearing or are proficient in bearing.
The criteria of judgment vary according to the mechanical properties and importance, as well as the inspection period, etc. In case of the resulting damage, the needle bearing shall not be reused and must be replaced.
1) Fracture and defect of INA Bearing parts.
2) Peeling of the rolling surface of the raceway surface.
Of course, the loss of bearings is a very healthy thing. What we need to do is to extend their service life as much as possible in daily use. Therefore, it is suggested that when using the bearing, attention should be paid to the installation, lubrication, clearance, and other links, to ensure the work progress and reduce the production cost.