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FAG import bearings after installation, in order to check for proper installation, to running inspection. Small machinery can be rotated by hand, to confirm whether the rotation is smooth. Check the project caused by foreign body, scars, indentation running sluggish, due to poor installation, mounting process arising out of the bad moment is not stable, because the clearance is too small, installation error, sealing caused by friction force is too large and so on. If there is no anomaly can begin power operation.
Large machinery can not be manually rotated, so the no-load starting immediately after power cut, mechanical idling, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation, from the no-load speed, slowly increased to the rated operating condition. Test run of issues, whether there is abnormal sound, FAG bearing temperature, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machine, necessary to remove the bearing inspection.
FAG imports the bearing temperature, generally according to the external temperature of the bearing seat to speculate. But the direct measurement of the bearing outer ring with oil hole temperature more accurately. Bearing temperature, from a running start rising, usually 1~2 hours after the temperature stability. Bad if the bearings are mounted, the temperature will rise sharply, abnormal high temperature. The reason such as excessive lubricant, the bearing clearance is too small, poor installation, sealing device too much friction. High speed rotating occasions, FAG import bearings, lubrication mode selection is also the cause of the error.
With a stethoscope to turn the sound FAG bearing imports inspection, there is a strong metal noises, abnormal sound, tone, irregular abnormal. Due to poor lubrication, shaft or housing poor accuracy, bearing damage, foreign intrusion etc..
The following common failures of FAG bearing imports:
1, the tile surface corrosion: spectral analysis found that the non-ferrous metal element concentration anomaly; there are many nonferrous metal components of the submicron wear particles in lubricant iron spectrum; water exceed the standard, exceed the standard value.
2, the journal surface strain: iron spectrum in iron cutting abrasive or black oxide particles, temper metal surface.
3, the journal surface corrosion: spectral analysis of iron concentrations found abnormal, the sub micron particle has a lot of Ferrographic iron composition of lubricating oil water content exceed the standard value, or exceed the standard.
4, the surface strain: iron spectrum is found to have a cutting abrasive, abrasive composition for non-ferrous metals.
5, w back fretting wear: spectral analysis of iron concentrations found abnormal, many of Ferrographic submicron wear particles of iron components, lubricating oil water content and acid value anomaly.
In liquid lubrication conditions, separated by sliding surface oil without direct contact, but also can greatly reduce the friction loss and surface abrasion, oil film also has a certain vibration absorption capacity