What should I do if the SKF bearing is damaged?

Stripping

Damage state: When the SKF bearing is subjected to load rotation, the raceway surface or the rolling surface of the inner ring and the outer ring exhibits fish scale-like peeling due to rolling fatigue.

Reason: The load is too large. Poor installation (non-linear) torque load foreign matter intrusion, water ingress. Poor lubrication, improper lubricant, SKF bearing clearance is not appropriate. The accuracy of the SKF bearing housing is not good, and the deflection of the rigid uneven shaft of the SKF bearing housing is caused by large rust, erosion points, scratches and indentations (surface deformation phenomena).

Measures: Check the size of the load and the SKF bearing used in the re-inspection to improve the installation method to improve the sealing device and prevent rust during shutdown. Use a lubricant of appropriate viscosity to improve the lubrication method. Check the accuracy of the shaft and SKF bearing housing. Check the clearance.

Peeling

Damage state: 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.

Cause: The lubricant is not suitable. Foreign matter enters the lubricant. Poor lubricant causes a rough surface. The surface finish of the paired rolling parts is not good.

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

Card injury

Damage state: The so-called card injury is a surface damage caused by a combination of minute burns generated in a sliding surface flaw. 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.

Reason: Excessive load, excessive preload. Poor lubrication. Foreign body bites into it. The inclination of the outer ring of the inner ring and the deflection of the shaft. The accuracy of the shaft and SKF bearing housing is poor.

Action: Check the size of the load. Preload should be appropriate. Improve lubricants and lubrication methods. Check the accuracy of the shaft and SKF bearing housing.

Broken

Damage state: The so-called fracture refers to a small portion of the fracture due to the application of a musical impact or an excessive load to a portion of the rim or the roller angle of the raceway.

Reason: The installation was hit. The load is too large. Poor use, such as falling.

Action: Improve the installation method (hot pack, use the appropriate tool holder). Correct the load conditions. The SKF bearing is mounted in place to support the ribs.

Crack, crack

Damage state: The so-called crack refers to the crack damage caused by the race wheel or the rolling element. If it continues to be used, it will also include cracks that develop cracks.

Reason: Too much excess. Excessive load, impact load. Stripping has developed. Heat and fretting wear due to contact of the raceway wheel with the mounting member. The fever caused by creep. The cone angle of the cone shaft is poor. The cylindricity of the shaft is poor. The corner radius of the shaft step is larger than the SKF bearing chamfer, which causes interference with the SKF bearing chamfer.

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27 reasons why TN bearings are ringing

After a long-term summary by the technicians, there are 27 reasons for the NTN bearing to sound. There may be many that we have not encountered before, and will be slowly replenished later.

1. The NTN bearing is mixed with impurities such as sand or carbon particles to act as an abrasive.

2. The NTN bearing is mixed with moisture, acid or paint and other dirt, which acts as a corrosive effect;

3. The clearance of the NTN bearing is too small (the selection is not appropriate);

4. The lubricating oil or grease type is incorrectly selected;

5. Insufficient lubrication (oil level is too low, oil or grease leaks through the seal);

6. The NTN bearing is flattened by the seat hole (the roundness of the seat hole is not good, or the seat hole is not twisted straight);

7. The horn of the bottom surface of the NTN bearing housing is not flat (resulting in deformation of the seat hole or even cracking of the NTN bearing housing);

8. There are debris in the hole of the NTN bearing housing (residual chips, dust particles, etc.);

9. The seal is eccentric (wearing adjacent parts and rubbing);

10. NTN bearings are subjected to additional loads (NTN bearings are axially tightened, or two fixed-end NTN bearings on one shaft);

11. The thermal elongation of the shaft is too large (NTN bearing is subjected to static and indeterminate axial additional load);

12. The clearance of the NTN bearing is too small, and the rotation is too tight (the tightening sleeve is too tight);

13. NTN bearing is noisy (caused by the end face of the roller or the ball is slipping);

14. The fit between the NTN bearing and the shaft is too loose (the diameter of the shaft is too small or the adapter sleeve is not tightened);

15. The shoulder is too large (touching the seal of the NTN bearing and rubbing);

16. The shoulder of the seat hole is too large (the seal of the NTN bearing is distorted);

17. The gap of the labyrinth seal is too small (friction with the shaft);

18. The teeth of the lock washer are bent (touching the NTN bearing and rubbing);

19. The position of the oil ring is not suitable (the flange cover is encountered and friction occurs);

20. There is a pressure pit on the steel ball or roller (caused by hammering NTN bearing when installing);

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