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The production and elimination of the noise of single direction thrust ball bearings

wallpapers Tech 2020-11-20
The criteria for judging when the noise of single direction thrust ball bearings are generated need to be different according to the mechanical performance, importance and inspection cycle. If the following damage occurs, the single direction thrust ball bearing must not be reused and must be replaced. In the process of using bearings, grease is very critical. If degraded grease is used, it will not only fail to function as it should, but it will also damage the bearing.
The raceway sound of a single direction thrust ball bearing and its control method The raceway sound is a slippery and continuous sound produced by the rolling elements rolling on the raceway surface when the single direction bearing is running. It is a unique phenomenon that occurs in all rolling bearings. The basic sound. The general bearing sound is the raceway sound plus other sounds. The raceway sound of a ball bearing is irregular, the frequency is above 1000Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the speed of the speed. For bearings with loud raceway sound, the sound pressure level of the raceway sound decreases with the increase of viscosity, while for bearings with low raceway sound, the sound pressure level changes from a decrease when the viscosity increases above about 20mm2/s. To have increased.
The greater the rigidity of the bearing seat, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases. The methods to control the raceway sound are to select low-noise bearings, that is, bearings with small waviness, and carefully choose the conditions of use. The noise of the raceway often affects the noise of the entire machine, reducing the noise of the raceway can reduce the noise of the entire machine.
Twist the lubricating oil between the thumb and the index finger and grind repeatedly, the better lubricating oil feels lubricating, less wear debris, and no friction. If you feel the grit between the fingers and the like, it means the lubricating oil There are too many impurities in it, so it can't be used anymore, it should be replaced with a new lubricant. The metallurgical quality of single direction thrust ball bearing materials used to be the main factor affecting the early failure of the bearing. With the improvement of metallurgical technology, the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting bearing failure. The selection of materials is still a factor that must be considered in bearing failure analysis.
The main task of failure analysis of single direction thrust ball bearings is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures and extend the service of spherical roller bearings. Period to avoid sudden early failure of the bearing. The vibration of the single direction thrust ball bearing has a significant effect on the failure of the bearing. For example spalling, indentation, rust, cracks, abrasion, etc. will be reflected in the bearing vibration test, so by using a special bearing vibration measuring device, the size of the vibration can be measured. The frequency distribution can be used to infer the details of the abnormal vibration. The value is different due to the use of the bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured value of each machine in advance to determine the judgment scale.

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