I only rely on this chart to solve various bearing damages. The countermeasures for bearing damage are as follows:
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project
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phenomenon
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the reason
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Measures
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Peel off
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Running surface peeling
Obviously convex and concave after peeling
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Improper use under heavy load
Poor installation
Poor shaft or bearing housing accuracy
Clearance too small
Foreign body intrusion
Rust occurs
Decrease in hardness caused by abnormal high temperature
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Re-examine the conditions of use
Reselect bearing
Reconsider the clearance
Check the machining accuracy of the shaft and bearing housing
Study the design around the bearing
How to check the installation
Check lubricant and lubrication method
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burn
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The bearing heats up and changes color, and the burns cannot rotate
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The clearance is too small (including the clearance of the deformed part is too small)
Insufficient lubrication or improper lubricant
Excessive load (excessive preload)
Roller deflection
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Set proper clearance (increase the clearance)
Check the type of lubricant to ensure the amount of injection
Check the conditions of use
Prevent positioning errors
Check the design around the bearing (including heating of the bearing)
Improve bearing assembly method
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crack
defect
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Partial gap
And cracked
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Shock load is too large
Excessive interference
There is a large peeling
Friction crack
Poor accuracy on the mounting side (too large corner round)
Poor use (use a copper hammer to insert large foreign objects)
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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
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Damaged cage
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Loose or broken rivets
Broken cage
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Torque load is too large
High-speed rotation or frequent speed changes
Poor lubrication
Stuck foreign body
Big vibration
Poor installation (installation in an inclined state)
Abnormal temperature rise (resin cage)
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Check the conditions of use
Check lubrication conditions
Re-study the choice of cage
Pay attention to the use of bearings
Study the rigidity of the shaft and the bearing housing
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Bruise
Stuck
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Rough surface, accompanied by tiny dissolution
The scratches between the flange of the ring and the end of the roller are called jams
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Poor lubrication
Foreign body intrusion
Roller deflection caused by bearing tilt
Oil fracture on the rib surface caused by large axial load
Rough surface
Large rolling element sliding
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Re-study lubricants and lubrication methods
Check the conditions of use
Set proper pre-pressure
Strengthen sealing performance
Normal use of bearings
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Rust
corrosion
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Partial or all rust on the surface
Rust on the pitch of rolling elements
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Poor storage condition
Improper packaging
Insufficient rust inhibitor
Intrusion of moisture, acid solution, etc.
Hold the bearing directly by hand
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Prevent rust during storage
Strengthen sealing performance
Regularly check the lubricating oil
Pay attention to the use of bearings
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Abrasion
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Red rust colored abrasive particles are produced on the mating surface
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Insufficient interference
Small bearing swing angle
Insufficient lubrication (or in a non-lubricated state)
Unsteady load
Vibration during transportation
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Check the interference and lubricant coating status
The inner and outer rings are packaged separately during transportation, and pre-pressure is applied when they cannot
Reselect lubricant
Reselect bearing
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Wear
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Surface wear, resulting in dimensional changes, often accompanied by abrasion and abrasion marks
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Foreign matter in the lubricant
Poor lubrication
Roller deflection
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Check lubricant and lubrication method
Strengthen sealing performance
Prevent positioning errors
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Electric erosion
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The rolling surface has pit-shaped pits, and the further development is corrugated
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Rolling surface energized
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Making current bypass valve
Take insulation measures to prevent current from passing through the inside of the bearing
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Indentation
Bruise
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Stuck in solid foreign objects, or surface pits caused by impact and scratches on installation
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Solid foreign body intrusion
Click in the release sheet
Impact and fall off caused by improper installation
Installation in a tilted state
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Improve installation and usage
Prevent foreign matter from entering
If it is caused by metal pieces, other parts must be checked
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Creep
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The inner diameter or outer diameter is slippery, causing the mirror surface or discoloration, and sometimes it gets stuck
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Insufficient interference at the fit
Insufficient sleeve tightening
Abnormal temperature rise
Overcharge
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Re-study interference
Research conditions of use
Check the accuracy of the shaft and bearing housing
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