Date: 2013-08-05

ntn bearing high-speed rotation Notes

ntn bearings in high speed rotation, in particular the speed close to or exceeding the limits of record size of the table speed, the main should pay attention to the following:

(1) The use of precision bearings;
(2) Analysis of the internal bearing clearance (taking into account the bearing temperature rise resulting reduction in the amount of internal clearance);
(3) analysis of cage material type (for high-speed rotation, suitable for cutting copper alloy or phenolic resin cage system. There is also applicable to high-speed rotation of the synthetic resin molding cage);
(4) Analysis of lubrication mode (for use on high-speed spin cycle of lubrication, spray lubrication, oil mist lubrication and oil lubrication Lubrication)
If a bearing lubrication test the decibel-based line of more than 8 dB, and we think that the bearings need lubrication. When we realized that the bearings need lubrication, then know when to stop oiling will prevent the emergence of over-lubrication. Can follow the following three steps to complete:
1) in order to ntn bearing manufacturer's guidance for the amount calculated on the basis, and then into the oil, not too much. This step is very subjective and has nothing to do with the ultrasound, and this step has never failed before.
2), when injected into oil lubrication technicians use ultrasonic equipment when the test bearings. Oiling down slowly until the decibel intensity-based line.
3) if there is no basis for lines as a guide, the amount of lubricating oil should be lower then the sound stops rising. At this time, technicians should stop the continued use of lubricating oil.
4), ultrasonic inspection Ultrasonic inspection of bearings or bearing damage monitoring is found that the early period (the beginning) the most reliable way. When the temperature rises or low-frequency vibration intensity is strengthened, ultrasound warning will be the first to ring. When the bearing damage due to excessive use of early, lack of excessive lubricating oil or lubricating oil, the use of this method of inspection of bearings is very useful. 

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