Regular attention to the maintenance of INA oil-free bearings

The bearing exhibits late fault characteristics to serious faults (generally bearing damage such as axle hung, burn, sand frame spalling, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual INA bearing fault diagnosis, once the late fault characteristics are found, the oil-free bearing should be judged decisively and the maintenance should be arranged as soon as possible.
Bearing manufacturing is customary through multiple processes such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Thermal handling and grinding processes that affect bearing quality are often more directly related to bearing failure. In recent years, the research on the 蜕 bearing working surface enthalpy layer shows that the grinding process is closely related to the bearing surface quality.
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the oil-free bearing state is very stable and enters a stable working period. After continuing to run, the bearing vibration and noise begin to increase, and sometimes abnormal sounds occur, but the vibration increase changes slowly. At this time, the bearing kurtness value suddenly reaches a certain value. We believe that the INA bearing is an initial failure at this time.
The primary obligation of bearing life analysis is to find out the primary factors that constitute bearing failure based on a large number of landscape data, profiling data and failure mode, so as to propose improvement measures in a targeted manner, delay the decommissioning period of oil-free bearings and avoid INA bearings have a sudden early failure of fire.
1. Change the 2# spindle oil and coarse fine filter after one year of normal operation.
2, the normal use of the pump station to replenish oil must be 3 layers of silk cloth filter to participate.
3. When the spindle pulley and the grinding wheel are loaded and unloaded, it must be stopped while the pumping station is working. That is, the spindle stops when the static pressure oil floats. This does not damage the spindle and the hydrostatic bearing.
4. Check whether the pressure of the pumping station and the static pressure of the grinding head can be within the standard range before working on the grinding wheel spindle.
5. When the equipment is shut down, the grinding head motor must be stopped first. After the grinding wheel is stopped, turn off the pumping station, otherwise the grinding head will be easily damaged.
6. If you change any parts on the pumping station, you must first remove the high-pressure oil inlet hose connector. After changing the parts, the oil circuit will self-circulate for 15-20 minutes to connect the oil inlet pipe to the grinding head. This ensures the oil pipe. The spindle oil entering the grinding head is a super-cleaned spindle oil that has been finely filtered. This can extend the service life of the hydrostatic spindle.

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