INA needle bearing raceway noise detection technical analysis

Raceway acoustic source lies in the inherent vibration caused by ring after exposure to the load. Because of the ring and rolling body elastic contact nonlinear vibration system. When lubrication or the machining accuracy is not high will stimulate the related to the elastic characteristics of natural vibration and passed to the was noise in the air. As is known to all, even if is to use the contemporary the most advanced manufacturing technology and processing needle bearing parts, there will always be the working surface of varying degrees of tiny geometric error, thus make the raceway and rolling body produces slight fluctuations inherent vibration excitation vibration system. 1. Oil film resistance diagnosis technical features: can use the same criteria for different working conditions. The surface spalling, indentation and crack the diagnosis of abnormal effect is poor. Application range: applicable to the axis of rotation exposed. 2. Vibration diagnosis technology features: vibration diagnosis technology widely used; Can realize on-line monitoring; Diagnosis, diagnosis theory has been mature. Application: apply is especially suitable for INA bearings in rotating machinery fault monitoring. 3. Ferrographic diagnosis technical features: the machine without disintegration; Low investment and good effect; Needle roller bearing can be discovered early fatigue failure; Can do wear mechanism research. Application range: applicable to oil lubrication INA bearing fault diagnosis, with grease lubricated bearings is relatively difficult. 4. Temperature diagnosis technical features: simple diagnosis; For bearing burn judgment effect is better. Application range: applicable to machine needle roller bearing in the conventional simple diagnosis. 5. The characteristics of the monitoring and diagnosis technology: fiber optic displacement sensor sensitivity; Surface to extract the signal directly from the INA bearing, to improve the signal-to-noise ratio; Can directly reflect the bearing manufacturing quality, the degree of surface wear, load, lubrication and clearance. Application range: applicable to the sensor can be installed on the bearing seat inside the machine. 6. Acoustic emission diagnosis technical features: diagnosis quick, easy; Can online monitoring. Application: in recent years the development of new technology, application is less in the needle roller bearing condition monitoring. Although the INA bearing raceway noise is inevitable, but can take work surface precision machining parts, the correct selection of bearing and precise use of bearing noise vibration reduction. Needle roller bearing a rotation, inner ring and outer ring raceway surface, with rolling body is rolling contact, as the dark side, thus orbit trajectory are attached to the raceway surface does not belong to abnormal, which can be learned that load conditions, so at the time of removal of INA bearings, please keep close attention and observation on the surface of the raceway.