Analysis and solution of bearing damage

Bearings are parts that must be used in most rotating equipment. Bearing damage is also commonplace. Then, how to solve problems such as peeling and burns?

Peel off

The running surface is peeled off, showing obvious convex and concave shape after peeling off
the reason:
1) Improper use of excessive load
2) Poor installation
3) Poor accuracy of shaft or bearing box
4) The clearance is too small
5) Foreign body intrusion
6) Rust occurs
7) Decrease in hardness caused by abnormal high temperature

1) Re-study the conditions of use
2) Reselect the bearing
3) Reconsider the clearance
4) Check the machining accuracy of the shaft and bearing box
5) Study the design around the bearing
6) Check the method of installation
7) Check lubricant and lubrication method
2. Burns

Phenomenon: The bearing heats up and changes color, and then burns and cannot rotate
the reason:
1) The clearance is too small (including the clearance of the deformed part)
2) Insufficient lubrication or improper lubricant
3) Excessive load (excessive preload)
4) Roller deviation

1) Set proper clearance (increase the clearance)
2) Check the type of lubricant to ensure the amount of injection
3) Check the conditions of use
4) Prevent positioning errors
5) Check the design around the bearing (including heating of the bearing)
6) Improve bearing assembly method

3. Crack defects

Phenomenon: Partially chipped and cracked
the reason:
1) The impact load is too large
2) Excessive interference
3) Large peeling
4) Friction cracks
5) Poor accuracy on the mounting side (too large corner round)
6) Poor use (use a copper hammer to insert large foreign objects)

1) Check the conditions of use
2) Set proper interference and check material
3) Improve installation and use methods
4) Prevent friction cracks (check lubricant)
5) Check the design around the bearing
4. The cage is damaged

Phenomenon: loose or broken rivet, broken cage
the reason:
1) Excessive torque load
2) High-speed rotation or frequent speed changes
3) Poor lubrication
4) Foreign body stuck
5) Great vibration
6) Poor installation (installation in an inclined state)
7) Abnormal temperature rise (resin cage)

1) Check the conditions of use
2) Check the lubrication conditions
3) Re-study the choice of cage
4) Pay attention to the use of bearings
5) Study the rigidity of the shaft and bearing box

5. Scratches and jams

Phenomenon: The surface is rough, accompanied by small dissolving; the scratches between the ring ribs and the roller end are called jams
the reason:
1) Poor lubrication
2) Foreign body intrusion
3) Roller deflection caused by bearing tilt
4) Oil fracture on the rib surface caused by large axial load
5) Rough surface
6) The rolling element slides greatly

1) Re-study lubricants and lubrication methods
2) Check the conditions of use
3) Set appropriate pre-pressure
4) Strengthen sealing performance
5) Normal use of bearings

6. Rust and corrosion

Phenomenon: Part or all of the surface is rusted, rusting in the form of rolling element pitch
the reason:
1) Poor storage condition
2) Improper packaging
3) Insufficient rust inhibitor
4) Intrusion of water, acid solution, etc.
5) Hold the bearing directly by hand

1) Prevent rust during storage
2) Strengthen sealing performance
3) Regularly check the lubricating oil
4) Pay attention to the use of bearings
7. Abrasion

Phenomenon: Red rust colored abrasive particles are produced on the mating surface
the reason:
1) Insufficient interference
2) The bearing swing angle is small
3) Insufficient lubrication (or no lubrication)
4) Unsteady load
5) Vibration during transportation

1) Check the interference and lubricant coating status
2) The inner and outer rings are packaged separately during transportation, and pre-compression is applied when they cannot be separated
3) Re-select lubricant
4) Reselect the bearing
8. Wear

Phenomenon: Surface wear, resulting in dimensional changes, often accompanied by abrasion and wear marks
the reason:
1) Foreign matter in the lubricant
2) Poor lubrication
3) Roller deviation

1) Check lubricant and lubrication method
2) Strengthen sealing performance
3) Prevent positioning errors
9. Electric corrosion

Phenomenon: The rolling surface has pit-shaped pits, and the further development is corrugated
Reason: the rolling surface is energized
Measures: make a current bypass valve; take insulation measures to prevent current from passing through the inside of the bearing

10. Indentation bruises

Phenomenon: Surface pits caused by stuck solid foreign objects or impact and scratches on installation
the reason:
1) Intrusion of solid foreign bodies
2) Click into the peeling sheet
3) Impact and fall off caused by poor installation
4) Install in an inclined state

1) Improve installation and usage methods
2) Prevent foreign matter from entering
3) If it is caused by sheet metal, check other parts

Post time: Sep-06-2020
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