HOME Bearing Knowledge

Contact

Knowledge

Analysis of FAG bearing quality of common cause failures


FAG bearings can remove the seal packing before delivery of the routine inspection, and will be washing gasoline immersed containing 3% oil or acid-free kerosene, rotate the outer ring and carefully washing holder, at the junction of the rolling elements and raceways, request any hidden parts of the original residual oil completely clean. Bearing should be attached in the Qing oil spray dry clean, put the table clean neutral lining in the lining on the line to dry, or slowly in the far infrared oven drying. Self-cleaning oil spray after drying or drying, the whole process may turn the bearing rings, cage or any of the rolling element.
FAG bearing has been airing or drying, provisions should be lubricated and immediate delivery inspection, the outer surface of the bearing no oil film protection, in the whole course of the examination shall be directly touching the hand skin, the operator should wear clean gloves, or coated with anti-rust agent, but must avoid the rolling surface rust inhibitor the hand into the bearing, otherwise it will make the measurement results deviation.
FAG bearings in after the examination, should be used for immediate delivery or rust inventory processing, the inspection process should also finish, to avoid lasted too long causing corrosion. Pay attention to the use of pure gasoline without oil washing can also cause corrosion.
A piece of metal plate with some prior to inspection and check the FAG bearing block gauge, standard parts and measuring instruments placed together in checking the place on, this can quickly make the homogenization temperature and room temperature of these objects.
1, the bearing temperature is too high: institutional operation, installation of bearing parts to allow a certain temperature, when the hand touch body shell, should not feel hot to normal, instead it indicates that the bearing temperature is too high.
Causes of bearing temperature FAG: lubricating oil quality does not meet the requirements or deterioration, lubricating oil viscosity is too high; preloaded mechanism (spaces); preloaded bearing; bearing race rotation on the shaft or shell; overload; bearing retainer or rolling element fragments.
2, the bearing noise: rolling bearing minor operation noise is allowed in the work, if the sound is too large or unusual noise or sound, it indicates that the bearing failure.
Causes noise rolling bearings: 1) is more complex, bearings, with surface wear. Due to the wear, destroyed the fit between bearing and housing, bearing and shaft, causes the axis deviates from the correct location, the shaft noise in high speed motion. When the bearing fatigue, its surface metal flake, also bearing radial clearance increases the noise. 2) insufficient lubrication of the bearing, the formation of dry friction, as well as bearing broken produces abnormal sound. 3) after bearing wear loose, loose cage damage, also can produce abnormal sound of bearing damage. Rolling bearing inspection when disassembled, can determine the fault and damage causes of bearing according to the damage of bearing.
3, the raceway surface metal flake: bearing rolling element and the inner, outer ring raceway surface are subjected to cyclical fluctuation load, resulting in periodic changes of contact stress. When the stress cycle number reaches a certain value, will produce fatigue spalling in the rolling body or the inner, outer ring raceway working face. If the bearing load is too large, will exacerbate this fatigue. In addition, the bearing is not being installed, shaft bending, also have a raceway spalling phenomenon. Raceway on Bearing fatigue peeling can reduce the running accuracy of the shaft, the mechanism of vibration and noise.
4, bearing burn: burn bearing raceway, the rolling body temper. Burn the reason is the general lack of lubrication, lubricating oil quality does not meet the requirements or deterioration, as well as the bearing assembly too tight.
5, the plastic deformation: pits uneven appearance of raceway and roller bearing contact surfaces, it indicates that the bearing to produce plastic deformation. The reason is bearing in static or impact loading, local stress more than material yield limit of the working surface, which generally occurs on the low speed rotation of the bearing.
6, bearing ring crack: causes of bearing ring crack may be bearing too tight, loose foreign or FAG bearing inner ring, bearing the containing part deformation, surface processing and installation of bearing failure.
7, cage fragmentation: the reason is lack of lubrication, rolling crush, seat tilt.
8, to maintain the metal adhesion frame in the rolling body, may cause is the rolling was stuck in a cage or lack of lubrication.
9, ring raceway of serious wear: may be in the race into the foreign body, lack of lubricating oil or lubricating oil is not suitable.

 

There is no message.
Online Messagess
Company:
Email:
Message:
ValidateCode: click refresh <--Not see, click refresh