Teach you how to lubrication maintenance NTN bearing the characteristics of normal operation - bearing knowledge

by:Waxing     2020-05-25
In the long-term production status monitoring, we found that the rolling bearing in the process of its use showed a strong regularity, and the repeatability is very good. The normal high quality imported bearing ( Rolling bearing) , at the beginning of the use of vibration and noise are relatively small, but there are some scattered of spectrum amplitude is small, may be due to some defects in the process of manufacturing, such as surface caused by burrs, etc. Movement after a period of time, maintain a certain level of vibration and noise, frequency spectrum is very single, only one or two times the frequency. More than three times the power frequency spectrum, seldom appears bearing condition is very stable, steady working period. Continue to run after the late into use, NTN bearing vibration and noise began to increase, sometimes a different sound, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value. At this point, we think, NTN bearing is characterized by early failure. At this time, requires to closely monitor the NTN import bearings, pay close attention to the change. Since then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate the increase, when the vibration more than standard ( Such as ISO2372 standard) , its bearing kurtosis value also began to increase rapidly, when more than vibration standard, and kurtosis value is more than normal ( Available kurtosis relative standard) When we think of bearing fault has entered the late production, should be timely maintenance equipment, change of rolling bearing. NTN bearing show late fault feature to severe fault ( For bearing damage, such as holding shaft commonly, burns, sand spallation, raceway, wear beads, etc. ) Most of time not more than a week, the bigger the equipment capacity, the faster the speed, the shorter the time interval. Therefore, in the actual fault diagnosis of rolling bearing, once found late fault characteristics, should be decisive judgment is bearing fault, arrange inspection as soon as possible. 1, oil bath lubrication oil bath lubrication is common in most NTN bearing lubrication method, suitable for low, medium speed, bearing lubrication. Will import bearing part of immersion in the slot, the bearing parts of lubricating oil by rotating, and then flow back to the oil level of oil tank should be slightly lower than the lowest at the center of the roller. 2, drip lubrication oil drip lubrication is suitable for need to ration oil imports NTN bearing parts, drip oil every 3 - general A drop of it is advisable to 8 seconds, too much oil will cause the bearing temperature increased. 3, circulating oil lubrication oil pump will filter the oil transfer to the NTN bearing parts, through the bearing lubricating oil filter cooling after use. Due to the circulating oil can take a certain quantity of heat, cooling the bearing, therefore method is suitable for high speed bearing parts. 4, spray lubrication with dry compressed air sprayer and lubricating oil mixed form oil mist, spray, NTN bearing can effectively make the bearing cooling airflow and can prevent the intrusion. This method is suitable for high speed, high temperature lubrication bearing parts. 5, spray lubrication oil pump to pass through the nozzle shot into the bearing, high pressure oil into the bearing of the bearing at the other end into the oil in the tank. When bearing at high speed, rolling element and cage with high rotate speed makes the surrounding air, the air in general it is difficult to be sent to the bearing lubricating oil lubrication method, then must use the method of high-pressure jet spray the lubricating oil to the bearings, the position of the nozzle should be placed between inner ring and retainer center!
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