Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing,...
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Transcript of Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing,...
12/8/13 Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing, Bearing Wear, Bearing Seizure, Retainer Cage Da…
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Bearing Failure Analysis
The accurate diagnosis of a bearing failure is imperative to prevent repeated failures and their additional expenses. While performing
failure analysis is commonly left to outside vendors, the actual collecting of information can make a great difference in correctly
diagnosing a bearing failure.
Here are some common failure types. Click on an image below for details or Contact Us for assistance:
FlakingSurface of the racew ay androlling elements peels aw ay inflakes Conspicuous hills andvalleys form soon afterw ard
PeelingPatches of minute f laking orpeeling. Innumerable hair-linecracks visible though not yetpeeling
SpallingScore accompanying seizing.Mounting score in axial direction.Scores on roller end face andguide rib-cycloidal scores.Scratches in spinning direction onracew ay surface and rollingcontact surfaces
Smearing and Scuffing The surface becomes rough andsome small deposits form.Scuff ing generally refers toroughness on the race collar andthe ends of the rollers
WearThe surfaces w ear anddimensional deformation results.Wear is often accompanied byroughness and scratches
Speckles and DiscolorationLuster of racew ay surfaces isgone; surface is matted, rough,and / or evenly dimpled. Surfacecovered w ith minute dents
Indentations / Dents and
ScratchesScoring during assembly, gougesdue to hard foreign objects, andsurface denting due tomechanical shock.
ChippingPartial chipping of inner ring,outer ring, or rolling elements.
Cracking and NotchingLocalized f laking occurs. Littlecracks or notches appear
Rust and CorrosionThe surface becomes eitherpartially or fully rusted, andoccasionally rust even occursalong the rolling element pitchlines
Seizing / SeizureThe bearing heats up andbecomes discolored. Eventuallythe bearing w ill seize up
Fretting and Fretting
CorrosionThere are tw o types of fretting.In one, a rusty w ear pow derforms on the mating surfaces. Inthe other, brinelling indentationsform on the racew ay at the
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12/8/13 Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing, Bearing Wear, Bearing Seizure, Retainer Cage Da…
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form on the racew ay at therolling element pitch
Electrical Pitting / Electrolytic
CorrosionPits form on the racew ay. Thepits gradually grow into ripples.
Rolling Path SkewingAbrasion or an irregular, rollingpath skew ing left by rollingelements along racew aysurfaces
Damage to Retainers /
Cage DamageRivets break or become looseresulting in cage damage.
CreepingSurface becomes mirrored bysliding of inside and outsidediameter surfaces. May byaccompanied by discoloration orscore
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