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FAG thrust ball bearing fault maintenance considerations - bearing knowledge

by:Waxing     2020-05-28
Thrust ball bearing fault feature show serious fault ( Normally, such as bearing damage, burns, sand spallation, raceway, wear beads, etc. ) No more than a week old, equipment, the capacity is bigger, faster, the shorter the time interval. As a result, the actual FAG bearing fault diagnosis of faults, its advanced function, once the should decisively determines the bearing failure, repair as soon as possible. 1, selection of shaft and the bearing chamber tolerance and control: after the bearing pressure into the thrust ball bearing should be flexible rotation without blocking. If there are any obvious rotation is not flexible, indicates the size of the shaft is too big, tolerance to downgrade. Such as bearing pressure into the shaft by hand after the rotation has obvious 'sasha vujacic' feeling, may be the shaft or shaft roundness tolerance is too big. When control the shaft and the bearing chamber tolerance so also want to control the roundness, at present many domestic manufacturers to control the tolerance, not to control the roundness. 2, bearing assembly way: because the bearing is high precision products, such as improper assembly is easy to cause damage to bearing channel, result in bearing damage. FAG bearing should have a special mould, when it is assembled cannot knock at random, only small circle of stress when pressure into the shaft, pressure can force the circle circle. Require the use of pneumatic or hydraulic assembly, lower die when being connected to outside the state level, such as with sloping channel leads to thrust ball bearing due to mechanical damage, and make the bearing guide ring. 3, the assembly to prevent foreign body: bearing in loaded on the rotor dynamic balance when it is easy to dynamic balance of iron into the bearing inside, so it is best to install bearing before do dynamic balance. There are some manufacturers in order to convenient assembly, assembly in bearing indoor coated with some oil or grease lubrication effect, but usually operators good amount of it is hard to control, if oil or grease in the bearing interior storing up more, in FAG bearing rotates along axis to the thrust ball bearings inside easily. Bearing chamber it is best not to apply oil or grease, if must apply to control shall not be storing up in bearing interior. 4, paint, rust prevention: paint rust is characterized by multiple in sealing type motor, the motor sound is very good, when it is assembled but put some time in the warehouse, the motor sound is very big, remove the bearing has serious rust phenomenon. Many manufacturers will think is a problem of bearing before, after our propaganda, motor factory now have realized mainly is a question of insulating varnish. Acid varnish comes out of the problem is mainly due to the formation of corrosive substances under certain temperature, humidity, the thrust ball bearing channel after corrosion result in bearing damage. The problem now is only to choose good insulating paint, after drying and ventilation assembly after a period of time.
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