It can be said that these reasons overlap with each other. Therefore, in order to fully understand the machine used in the INA bearing, the premise, the structure of the bearing periphery, if the situation before and after the accident can be clarified, combined with the damage of the powder metallurgy bearing and various reasons, it can be Prevent the recurrence of similar accidents.
If there is no choice error and can be used accurately, it will take a long time before the bearing life, in which case the damage state is peeling. On the other hand, there are accidental early damages, and early damage that cannot be used, as the cause of the early damage, there are insufficient considerations for use and lubrication, and further foreign matter intrusion, bearing assembly error and shaft deflection are large. Research on shafts and bearing housings is not enough.
INA bearings show late failure characteristics to serious failures (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week, the larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of powder metallurgy bearings, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.
The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the bearing and the housing, the bearing and the shaft are broken, resulting in the axis deviating from the correct position and generating an abnormal sound when the shaft is moving at a high speed. When the INA bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.
When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When the body of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the bearing temperature is too high.
The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the assembly of the powder metallurgy bearing is too tight; the bearing race rotates on the shaft or inside the casing; Excessive load; INA bearing cage or rolling element fragmentation.
The vibration system consisting of steel, flexibility, mass, damping, etc., determined by the bearing structural design parameters, will produce vibrations that are compatible with its mechanics under operating conditions.
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