Common damage status and measures of FAG bearings

1. Peeling: When the FAG bearing is subjected to load rotation, the raceway surface or rolling surface of the inner and outer rings exhibits fish scale-like peeling due to rolling fatigue.

Measures: Check the size of the load and the FAG bearing used again; improve the installation method; improve the sealing device; prevent rust during shutdown; use a lubricant of appropriate viscosity, improve the lubrication method; check the accuracy of the shaft and FAG bearing housing, check the tour Gap.

2. Peeling: It shows a dark surface with slight abrasion. There are many tiny cracks on the dark surface from the surface to 5-10m deep, and tiny shedding (small peeling) occurs in a wide range.

Action: Select a lubricant to improve the seal and improve the surface finish of the paired rolling parts.

3, card injury: surface damage caused by the accumulation of tiny burns in the sliding surface injury. Linear flaws in the circumferential direction of the slide surface and the rolling surface. The tangential flaw of the roller end face is close to the pinch of the collar surface of the roller end face.

Measures: Check the size of the load, preload should be appropriate; improve the lubricant and lubrication method; check the accuracy of the shaft and FAG bearing housing.

4. Fracture: A small portion of the fracture is caused by an impact or excessive load applied to the rim or the partial portion of the roller angle of the race wheel.

Action: Improve the installation method (hot pack, use the appropriate tool holder); correct the load conditions; FAG bearings are installed in place to support the ribs.

5. Cracks and cracks: Crack damage occurs in the raceway wheel or rolling element. If it continues to be used, it will also include cracks that develop cracks.

Measures: appropriate interference; check the load conditions; improve the installation method; the shape of the shaft should be appropriate.

6. Indentation: A dent generated on the raceway surface or the rotating surface when biting into a small metal powder or foreign matter. A concave surface (Brinell hardness indentation) is formed at intervals of the rolling elements due to impact during installation or the like.

Measures: impact bushing; improve sealing device; filter lubricating oil; improve assembly and use.

7, pear skin pitting: weak luster dark pear skin pitting corrosion on the raceway surface.

Action: Improve the seal; fully filter the oil; use a suitable lubricant.

8. Wear: Wear of the raceway surface or rolling surface, the roller end surface, the collar surface and the concave surface of the cage due to friction.

Measures: Improve the sealing device; Clean the FAG bearing housing; Fully filter the lubricating oil; Check the lubricant and lubrication method; Prevent non-linearity.

9. Fretting wear: The wear due to the relatively repeated slight sliding between the two contact faces is generated on the contact portion of the raceway surface and the rolling elements. Due to the occurrence of reddish brown and black abrasion powder, it is also called fretting wear corrosion.

Action: Use a suitable lubricant; add preload; check the interference; apply lubricant to the mating surface.

The above are the nine kinds of damage states common in FAG bearings and the corresponding solutions. From the above introduction, we can understand that the bearings are easy to cause damage if they are not careful. Therefore, it is necessary to do maintenance work frequently, and often check and test. Go to the problem and deal with it in time. This requires our relevant staff to have the idea of ​​preve
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FAG bearing installation and disassembly skills

FAG bearing installation:

1. First put the eccentric sleeve on the eccentric step of the inner sleeve of the FAG bearing, and tighten it by hand in the direction of rotation of the shaft. Then insert or hold the small iron rod into the counterbore on the eccentric sleeve, tap the small iron rod with the hammer in the direction of the rotation of the shaft, make the eccentric sleeve securely install, and finally lock the hexagon socket screw on the eccentric sleeve.

2. The bolts of the fixed FAG bearing housing should not be tightened first, so that the bearing casing can rotate in the bearing housing. Then fasten the bearing block bolts. Also mount the other end bearing and seat on the same shaft and turn the shaft a few turns to allow the FAG bearing itself to automatically position itself.

3. Apply lubricant to the bearing seat and bearing mating surface, and insert the FAG bearing into the bearing housing. Then assemble the assembled bearing with the FAG housing on the shaft and push it to the desired position for installation.

4. Before installing the FAG bearing on the shaft, the fixing pin of the bearing shell must be unplugged, and the surface of the journal should be smoothed and cleaned, and the oil is rust-proof and lubricated at the journal (allowing the bearing to rotate slightly on the shaft) .

Disassembly of FAG bearings:

1. Loosen the bolts that secure the bearing housing and remove the FAG bearing from the shaft together with the housing. Note that before the FAG bearing seat at one end of the shaft is removed, the bearing bolts at the other end of the shaft should be loosened to prevent the bearings at both ends from being damaged by each other.

2. First loosen the locking screw on the eccentric sleeve of the FAG bearing with an Allen key, then insert the small iron rod into the counterbore on the eccentric sleeve of the top cover, and loosen the eccentric sleeve against the rotation direction of the shaft.

The above is the introduction of FAG bearing installation and disassembly techniques, whether it is installation or disassembly, must be carefully carried out. Do not think that the disassembly is relatively simple, it is careless, so it is very easy to damage the bearing, it will affect the subsequent use effect and its service life.
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