FAG flat bearing fault handling and necessary maintenance measures

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 temperature of the FAG bearing 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 planar bearing is too tight; the bearing race rotates on the shaft or inside the casing; Too large; bearing cage or rolling element fragmentation.
Planar bearings allow a slight running noise during operation. If the sound is too loud or there is abnormal noise or impact, the 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, FAG bearings are insufficiently lubricated, dry friction is formed, and bearing crushing and the like can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.
1. Bearing maintenance: In order to maintain the original performance of the bearing in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy.
Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. The maintenance items in operation include the rotation sound, vibration, temperature, and lubricant status of the FAG bearing.
2. Inspection of the bearing: Cleaning of the bearing: When disassembling the bearing for repair, first record the appearance of the flat bearing, confirm the residual amount of the lubricant, and wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used.
The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. In rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.
Fine washing is to carefully clean the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
3. Inspection and judgment of the bearing: In order to judge whether the removed bearing can be used, it should be checked after the bearing is cleaned. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase in the FAG bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.

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Key maintenance issues for the normal use of FAG forklift bearings

Power operation, starting from no-load low-speed start, slowly progressing to the rated operation of the specified conditions. The inspection items during the test run are whether there is abnormal sound, FAG bearing temperature change, smoothing agent leakage or discoloration, and so on. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
   After the forklift bearing device is completed, in order to check whether the device is correct, stop the operation check. The small machine can be rotated by hand to confirm that it can rotate smoothly. The inspection items have poor operation due to foreign matter, scratches, and indentations. Due to poor equipment, the torque generated by the device seat is unstable, and the torque caused by excessive clearance, device error, and sealing friction is too large. Wait. If there is no abnormality, the power can be started.
Large machinery cannot be rotated manually, so the power is cut off immediately after the start of the no-load, and the machine is idling, checking for vibration, noise, contact with rotating parts, etc., and confirming that there is no abnormality, the power is turned on.
The rotation of the bearing is checked with a stethoscope, etc., and there are strong metal noise, abnormal sounds, irregular sounds, etc. to clarify the abnormality. The reason is that the smoothness is poor, the accuracy of the shaft or the bearing housing is poor, the FAG bearing is damaged, and the foreign matter is invaded.
Medium and large ball bearings, when the grease is smooth, especially in the winter, low temperature and other environmental conditions, there will be problems with the rolling sound. Ordinary, even if the rolling sound is attacked, the temperature of the bearing will not rise, and it will not affect the fatigue life, smooth grease life, and can be used normally.
      Forklift bearing temperature can be measured according to the external temperature of the bearing housing. However, the application of the oil hole directly measures the temperature of the outer ring of the bearing more accurately. The bearing temperature is gradually increased from the beginning of the operation, and the temperature is usually stable after 1 to 2 hours. If the forklift bearing device is defective, the temperature will rise sharply and it will be abnormally high temperature. The reasons are such as excessive smoothing agent, too small FAG bearing clearance, poor installation, excessive sealing and installation friction. The reason for the high-speed rotation, the bearing structure, and the selection of the smooth method are also the reasons.
The grease lubrication method has the characteristics of simple and easy operation, convenient roll replacement, and wide application. The appropriate grease should be selected according to the working temperature, rotation speed, rolling force, sealing waterproof performance, impact vibration size, and grease supply method of the rolling mill bearing. Greases of regular manufacturers with high temperature resistance, high viscosity, excellent extreme pressure performance and high water repellency resistance should be selected. According to the working characteristics of the rolling mill bearing, 2#, 3#, lithium base grease or polyurea containing EP additive should be selected.
Although the high-performance grease purchase cost is high, but the amount is small, the forklift bearing has a long service life, and the total comprehensive cost is reduced. In addition, the filling amount of the grease must be in an appropriate amount and filled in place. The grease of different grades cannot be mixed, so that the working surface of the bearing of the rolling mill is always in the normal state of the oil film.
Fill the inner space of the FAG bearing when filling the grease for the first time. For the vertical roller or the inclined roller, fill the upper and lower covers of each bearing seat with a sufficient amount of grease. After each roll change, check whether the grease is hardened and blackened, contaminated with impurities, and oxidized and emulsified. If the above situation occurs, the grease should be completely replaced and the seal and sealing structure should be replaced or improved in time; if the situation is still good, the new grease can be added and continue to be used.
Oil and gas lubrication is the ideal lubrication method for bearings. During the working period, the compressed air enters the bearing with lubricating oil at intervals. The lubricating oil is left inside the forklift bearing. The air takes away the heat in the running of the bearing and blocks the external Impurity water vapor is immersed inside the FAG bearing. The oil is not atomized and does not pollute the environment.

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