bearing damage issues of analysis

1. Stripping

Phenomena:
The running surface peels off and shows a noticeable convex concave shape after peeling

Reason:
1) Excessive load and improper use
2) Poor installation
3) Poor accuracy of shaft or bearing box
4) Clearance too small
5) Foreign object invasion
6) Rust occurs
7) Hardness decrease caused by abnormal high temperature

Measures:
1) Re study usage conditions
2) Re select bearings
3) Reconsider clearance
4) Check the machining accuracy of the shaft and bearing box
5) Study the design around bearings
6) Method of checking installation
7) Check lubricants and lubrication methods

2. Burns

Phenomenon: The bearing heats up and discolors, resulting in burns and inability to rotate

Reason:
1) Excessive clearance (including deformation)
2) Insufficient or improper lubrication
3) Excessive load (excessive preload)
4) Roller deviation

Measures:
1) Set appropriate clearance (increase clearance)
2) Check the type of lubricant to ensure the injection amount
3) Check usage conditions
4) Preventing positioning errors
5) Check the design around the bearings (including bearing heating)
6) Improving bearing assembly methods

3. Crack defect

Phenomenon: Partial nicks and cracks

Reason:
1) Excessive impact load
2) Excessive interference
3) There is significant peeling
4) Friction crack
5) Poor installation accuracy (corner circle too large)
6) Poor use (using a copper hammer to clip in large foreign objects)

Measures:
1) Check usage conditions
2) Set appropriate interference and check material
3) Improve installation and usage methods
4) Prevent friction cracks (check lubricant)
5) Check the design around the bearings

4. Damaged cage

Phenomenon: Loose or broken rivets, broken cage

Reason:
1) Excessive torque load
2) High speed rotation or frequent speed changes
3) Poor lubrication
4) Impacted foreign object
5) High vibration
6) Poor installation (installation in tilted state)
7) Abnormal temperature rise (resin holder)

Measures:
1) Check usage conditions
2) Check lubrication conditions
3) Re study the selection of the cage
4) Pay attention to the use of bearings
5) Research on shaft and bearing box rigidity

5. Scratches and bruises

Phenomenon: Rough surface with slight dissolution; The scratch between the collar edge and the roller end face is called a scratch

Reason:
1) Poor lubrication
2) Foreign object invasion
3) Roller deflection caused by bearing tilting
4) Oil cutoff on the retaining surface caused by high axial load
5) Large surface roughness
6) Rolling element sliding large

Measures:
1) Further research on lubricants and lubrication methods
2) Check usage conditions
3) Set appropriate preloading
4) Enhanced sealing performance
5) Normal use of bearings

6. Rust corrosion

Phenomenon: Partial or complete surface rust, in the form of rolling tooth pitch rust

Reason:
1) Poor storage status
2) Improper packaging
3) Insufficient rust inhibitor
4) Invasion of water, acid solution, etc
5) Directly hold the bearing by hand

Measures:
1) Prevent rusting during storage
2) Enhanced sealing performance
3) Regularly check the lubricating oil
4) Pay attention to the use of bearings

7. Abrasion

Phenomenon: Red rust colored wear particles appear on the mating surface

Reason:
1) Insufficient interference
2) Small bearing shaking angle
3) Insufficient lubrication (or in a state of no lubrication)
4) Unstable load
5) Vibration during transportation

Measures:
1) Check the interference and lubricant application status
2) During transportation, the inner and outer rings are packaged separately, and preloading is applied when they cannot be separated
3) Re select lubricant
4) Re select bearings

8. Wear and tear

Phenomenon: Surface wear, resulting in dimensional changes, often accompanied by abrasions and scratches

Reason:
1) Foreign objects mixed in lubricant
2) Poor lubrication
3) Roller deviation

Measures:
1) Check lubricants and lubrication methods
2) Enhanced sealing performance
3) Preventing positioning errors

9. Electrical erosion

Phenomenon: The rolling surface has a crater like crater, which further develops into a wavy plate shape

Reason: The rolling surface is powered on

Measures: Make a current bypass valve; Take insulation measures to prevent current from passing through the interior of the bearing

10. Indentation damage

Phenomenon: Surface dents caused by stuck solid foreign objects or impacts, as well as scratches during installation

Reason:
1) Invasion of solid foreign objects
2) Clipping in the strip
3) Impact and detachment caused by poor installation
4) Installing in an inclined state

Measures:
1) Improve installation and usage methods
2) Prevent foreign objects from entering
3) If caused by metal sheet, other parts must be inspected