1. Spalling
Phenomenon
The running surface is stripped, and it is obviously convex and concave after spalling
Reasons
- Incorrect usage leads to excessive load
- Incorrect installation
- The poor shaft or bearing housing accuracy
- Clearance too small
- Foreign body intrusion
- Rust
- A decrease in hardness caused by abnormally high temperatures
Solution
- Re-study the conditions of use
- Reselect bearings
- Reconsider the clearance
- Check the machining accuracy of the shaft and bearing housing
- Study the design around the bearing
- Check how to install
- Check lubricants and lubrication methods
2. Overheating
Phenomenon
The bearing is discolored and cannot be rotated
Reasons
- The clearance is too small (including the minor support of the deformed part)
- Insufficient or improper lubrication
- Excessive load (excessive preload)
- Roller deflection
Solution
- Set proper clearance (increase clearance)
- Check lubricant type to ensure an appropriate injection
- Check the conditions of use
- Prevent positioning errors
- Check the design around the bearing (including bearing heating)
- Improve the bearing assembly method
3. Crack defect
Phenomenon
Chipped and cracked
Reasons
- Excessive shock load
- Too much interference
- With larger peeling
- Friction crack
- Poor accuracy on the mounting side (excessive corner rounding)
- Improper use (sizeable foreign body stuck)
Solution
- Check the conditions of use
- Set proper interference and check material
- Improve installation and usage
- Prevent friction cracks (check lubricant)
- Check the design around the bearing
4. Cage damaged
Phenomenon
Loose or broken rivets, broken cages
Reasons
- Excessive moment load
- High-speed rotation or frequent speed changes
- Poor lubrication
- stuck foreign body
- big vibration
- Poor installation (installed in a tilted state)
- Abnormal temperature rise (resin cage)
Solution
- Check the conditions of use
- Check lubrication conditions
- Re-study cage options
- Pay attention to the use of bearings
- Investigate shaft and bearing housing rigidity
5. Scratches and jams
Phenomenon
Rough surface, accompanied by micro-dissolving; the abrasion between the ferrule edge and the end face of the roller is called jamming
Reasons
- Poor lubrication
- foreign body intrusion
- Roller deflection due to bearing tilt
- Oil cut on rib surface caused by sizeable axial load
- Rough surface
- Roller sliding is large
Solution
- Re-study lubricants and lubrication methods
- Check the conditions of use
- Set proper preload
- Enhanced sealing performance
- Bearings in normal use
6. Rust corrosion
Phenomenon
Partial or complete rust on the surface, rusting in the form of rolling element tooth pitch
Reasons
- Poor storage condition
- Improper packaging
- Insufficient rust inhibitor
- The intrusion of moisture, acid solution, etc.
- Hold the bearing directly by hand
Solution
- Prevent rust during storage
- Enhanced sealing performance
- Check Lubricants Regularly
- Pay attention to the use of bearings
7. Abrasive
Phenomenon
The mating surface produces red rust-colored wear particles
Reasons
- Not enough interference
- Small bearing rocking angle
- Insufficient lubrication (or in an unlubricated state)
- Unstable load
- Vibration during transport
Solution
- Check interference and lubricant application status
- When transporting, the inner and outer rings are packaged separately, and if they cannot be Separated, apply pre-compression
- Reselect lubricant
- Reselect bearings
8. Attrit
Phenomenon
Surface wear, resulting in dimensional changes, often accompanied by abrasions and wear marks
Reasons
- Lubricant mixed with foreign matter
- Poor lubrication
- Roller deflection
Solution
- Check lubricants and lubrication methods
- Enhanced sealing performance
- Prevent positioning errors
9. Electrical erosion
Phenomenon
The rolling surface has crater-shaped pits, and further development is in the shape of a corrugated plate
Reasons
- Scroll surface energized
Solution
- Make a current bypass valve; take insulation measures to prevent current from passing through the inside of the bearing
10. Indentation and bumps
Phenomenon
Surface dents and scratches during installation caused by stuck solid foreign objects or impact
Reasons
- Solid foreign body intrusion
- Snap-in release sheet
- The shock caused by poor installation, falling off
- Installing in a tilted state
Solution
- Improve installation and usage
- Prevent foreign matter from entering
- If metal pieces cause it, other parts must be checked
