Solution to heating damage and judgment of fag thrust ball bearings

FAG thrust ball bearings are a type of bearing designed to handle axial loads that are perpendicular to the bearing’s axis. They consist of a series of small balls arranged in a groove running along the bearing’s inner and outer races. This design allows for high-speed operation, precision control, and excellent load distribution. FAG thrust ball bearings are commonly used in applications such as automotive transmissions, machine tool spindles, and heavy-duty machinery equipment.

The shaft parts of machine tools, especially the spindle, are generally assembled with rolling bearings or sliding bearings and rotate at a high speed, sometimes generating high heat. If this phenomenon is not eliminated in time, it will cause the fag bearing to overheat and cause the temperature of the corresponding parts of the machine tool to rise, resulting in thermal deformation. In serious cases, the height of the spindle and tailstock will be unequal, which will not only affect the accuracy and machining accuracy of the machine tool itself, but also burn out the bearing.

How to judge the damage of fag thrust ball bearings

Generally, if the thrust ball bearings is used correctly, it can be used until the fatigue life is reached. However, there will be accidental and premature damage, which can not be resistant to use. This early damage, as opposed to fatigue life, is the quality service limit called failure or accident. Most of them are caused by careless installation, use and lubrication, foreign matters invading from the outside, and insufficient research on the thermal effects of shafts and shells.
As for the damage state of the bearing, such as the clamping damage of the ferrule and retaining edge of fag bearing, these reasons can be considered. These reasons also coincide with insufficient lubricant, unfitness, defects of oil supply and drainage structure, invasion of foreign matters, bearing installation error and excessive deflection of the shaft.
Therefore, only investigating the bearing damage, it is difficult to know the real cause of the damage. However, if we know the use machinery and conditions of the bearing, the structure around the bearing, understand the situation before and after the accident, and investigate the damage state of the bearing and several causes, we can prevent the recurrence of similar accidents.
The judgment of whether the bearing is available is mainly determined by considering the damage degree, mechanical performance, importance, operating conditions and the period until the next maintenance of the thrust ball bearings. If there are the following defects, it can no longer be used, and the fag bearing must be replaced with a new one. There are cracks or notches on any one of the inner ring, outer ring, rolling element and cage.

Any one of the ferrule and rolling element is broken.There are significant card injuries on the rolling track surface, retaining edge and rolling body.Significant wear of cage or significant relaxation of rivets.There is rust and damage on the raceway surface and rolling element.There are serious indentations and scratches on the raceway surface and rolling element.
There is obvious creep on the inner diameter surface of the inner ring or the outer diameter surface of the outer ring.Discoloration caused by heat is obvious.The bearing, sealing ring or dust cover sealed with grease is obviously damaged.Fag thrust ball bearings is the main vibration source that is difficult to control.
Because the vibrating screen depends on a large excitation force to maintain the limit speed and friction coefficient of the working bearing, the radial force on the outer spherical bearing is large. During the working process of the vibrating screen, a large excitation force will cause the elastic vibration of the bearing system.
If the lubrication is poor, there will be large friction, so that the bearing temperature rise is too high, the thermal expansion is too large, and the radial clearance is significantly reduced, which intensifies the friction and further improves the temperature rise.

The locking methods of bearings are generally divided into two types:

Bearing attached with screws：Just lock the fastening screw on the extension part of the inner ring to fix the bearing seat, and lock it with a hexagonal wrench. Please select a hex wrench of appropriate size.Solution to heating damage and judgment of fag thrust ball bearing
Bearing with locking sleeve：The fair locking sleeve has a recess, which is fair to the vibration and temperature of the outer spherical bearing. The recess is fair to its inner hole, and there is also a part of the inner ring of the bearing seat. First position the fair sleeve on the inner ring, rotate the fair bearing sleeve quickly towards the rotation direction of the shaft until it is clamped, and lock the screw with a hexagonal wrench.

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