The INA bearing allows a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact, it indicates that the oil-free bearing is faulty.
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 bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, the INA bearing is insufficiently lubricated, and dry friction, as well as bearing crushing, can produce abnormal sounds. After the oil-free bearing wears loose, the cage is loose and damaged, and abnormal noise will also occur.
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 quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the mechanism is too tightly assembled (insufficient clearance); the INA bearing assembly is too tight; the oil-free bearing race rotates on the shaft or inside the casing; the load is too large; the bearing cage Or rolling body fragmentation, etc.
From the peeling, indentation, rust, crack, wear and so on, it will be reflected in the vibration measurement of the INA bearing. The bearing vibration is very sensitive to the damage of the bearing. Therefore, by using a special oil-free bearing vibration measuring device (frequency analysis) The magnitude of the vibration can be measured, and the specific situation of the abnormality cannot be inferred by the frequency division. Since the measured values differ depending on the conditions of use of the bearing or the mounting position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.
Because the INA bearing emits abnormal sounds and irregular sounds even if there is slight peeling damage, the sounder can be used for resolution, and the sounder is used to measure the size and sound quality of the oil-free bearing rolling sound during operation. Check, play a role in prevention in advance.
If the oil hole can be used to directly measure the bearing outer ring temperature, it is more suitable. In general, the temperature of the INA bearing is generally estimated based on the temperature outside the bearing. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Usually, the temperature of the bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If necessary, use the thermal sensor to monitor the operating temperature of the oil-free bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the burning shaft accident.
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