Long-term use of bearings causes noise in the bearings, how to solve them
When the bearing is used for a period of time, it will produce noise, even if it is a silent bearing, why is this? When we were recycling imported bearings, we talked about the nature of bearing noise when we chatted with the maintenance staff in the workshop during idle time. They said that the noise generated during the use of the bearing is very common, which is an inevitable problem in the use of the bearing. Then he shared several methods of noise reduction with his years of experience in bearing operation. The first type: the track sound of the bearing and the method of controlling the sound of the raceway. The sound of the raceway is the sound that the rolling element of the bearing rolls on the raceway when the bearing is running. The characteristic is slippery continuous. It is the basic sound that all rolling bearings will produce. Some of the most common bearing noises are the sound of the raceway plus the mixing of other sounds. The raceway sound will also be different. For example, the ball bearing's raceway sound is an irregular raceway sound. She has a frequency above 1000Hz, and then its main frequency differs from other bearings in that it does not follow the speed. The change, but its total sound pressure level increases with the increase of the speed. Some bearings with a particularly large rolling sound, the sound pressure level and viscosity range of the raceway sound are inversely proportional, that is, the greater the viscosity, the smaller the sound of the raceway; and the smaller the sound of the raceway, the sound pressure level of the raceway The viscosity is proportional, that is, the greater the viscosity, the greater the sound pressure level. The change in the sound of the raceway is also related to the rigidity of the bearing housing. The rigidity of the bearing housing and the inverse of the sound pressure level of the raceway sound, that is, the greater the rigidity of the bearing housing, the lower the total sound pressure level of the raceway sound. Also related is the radial clearance. The sound pressure level and the main frequency of the radial clearance and the raceway sound are inversely proportional. The smaller the radial clearance, the larger the sound pressure level and the main frequency. After reading the above, the control method for the rolling track sound is actually a bit clue. We can choose the bearing with small waviness, so the noise will be effectively reduced, and the use conditions must be cautious. The occurrence of the rolling sound has a great influence on the overall mechanical noise, and the reduction of the rolling sound can effectively reduce the noise of the entire machine. The second type: the impact sound of the rolling element and the control method. The impact sound of the rolling element is generated because the centrifugal force of the rolling element is relatively small when the larger type of ball bearing or the circular Roller Bearing is operated at a low speed under a pure radial load. Rolling elements in the unloaded area can impact the cage or raceway and can cause noise. However, this sound will decrease as the speed increases until it disappears. Controls for such sounds are: proper reduction of radial play, use of bearings with a reasonable structure and a material that is flexible. The third type: the crushing sound produced by the bearing and its control method. The rolling sound of the bearing is mainly produced in cylindrical roller bearings, most of which occur in the larger type of grease-lubricated bearings. This sound is used in any occasion. Possible to produce, the characteristics are: harsh metal friction sound. This kind of sound is more likely to occur in greases with degraded base oil properties, but the chance of occurrence in oil lubrication is much less or even less. Then the occurrence of this sound has a certain relationship with the season. The season that is prone to occur is winter. When it is subjected to pure radial load, the bearing of the bearing is likely to occur when the radial clearance is large, and the model is also One of the major factors of this kind of sound, the speed is also an aspect of the impact, bearing crushing sound is easy to occur in a certain range of speed, this sound will occur continuously and indirectly. If you want to reduce the occurrence of this kind of situation, you can take special processing methods for the outer ring raceway, which can effectively prevent the rolling sound from appearing. If necessary, you can use this kind of bearing, or reduce the radial clearance of the bearing properly, use the excellent grease and improve the rigidity of the bearing matching parts. These methods can effectively make this happen. The probability of reduction is reduced.