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During the use of precision bearings, with the relative […]
During the use of precision bearings, with the relative movement between the rolling elements and the raceways, as well as the intrusion of pollutants in the surrounding environment, the surfaces of the rolling elements and raceways will be worn. At this time, the bearing clearance, noise and vibration will increase, which will reduce the bearing running accuracy and directly affect the accuracy of the main engine. Therefore, for the bearing, the wear amount can be used. To limit the life of the bearing, what are the reasons for the amount of wear? What should be done to properly control the amount of wear?
(1) The raceway sound of the bearing and its control method:
The raceway sound is a slippery and continuous sound emitted by the rolling elements rolling on the raceway surface when the bearing is running. It is the basic sound that occurs in all rolling bearings. The methods of controlling the sound of the raceway are: choose low-noise precision bearings, and carefully choose the conditions of use. The noise of the raceway usually affects the noise of the entire machine, and reducing the sound of the raceway can reduce the noise of the entire machine.
(2) Impact sound of rolling element and its control method:
When a larger type of ball bearing or cylindrical roller bearing operates at low speed under pure radial load, due to the small centrifugal force of the rolling element, the rolling element in the non-load zone will impact the cage or raceway and make noise. But as the revs increase, the noise disappears. The control methods for the impact sound of rolling elements are: reducing the radial clearance appropriately, and using bearings with reasonable structure and flexible cages.
(3) The rolling noise of the bearing and its control method:
Rolling noise is a harsh metal friction sound that may occur in cylindrical roller bearings in all occasions. Most of them occur in larger type bearings lubricated by grease, but are more likely to occur in greases with degraded base oil performance. When oil lubricated Almost never happens. In addition, it is more likely to occur in winter. When subjected to pure radial load, it is prone to occur in occasions with large radial clearance, and it is prone to occur within a certain speed range depending on the size of the model. It will occur continuously and occurs intermittently. Adopting a special processing method for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, this kind of bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the grease with excellent performance can be used, and the rigidity of the parts matched with the bearing can be improved. .
The control of raceway sound, impact sound and rolling sound is important, but the selection of bearings is more important. It is necessary to choose high-speed, high-precision, low-noise precision bearings.