Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing,...
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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… www.actionbearing.com/technical_toolbox.html 1/2 Call Us: 800.225.4587 or 617.782.1400 E-mail: [email protected] Home About Us RFQ Contact Us Product Catalog Marketing Line Card Monthly Specials News/Articles The Bearing Detective Technical Toolbox En Espanõl Providing Market and Industry Specific Solutions for Bearing Needs in the New England Region PRODUCTS Ball Bearings Roller Bearings Mounted Units Oil Seals Roller Chain/ Leaf Chain Cam Followers/Yoke Rollers Rod Ends/Spherical Bushings Linear Motion Bearing Accessories Industry Solutions News/Articles Video Tutorials Technical Toolbox Technical Definitions and Conversion Charts 1. Inch>Decimal>Metric Conversion Chart (PDF - 270KB) 2. Shaft and housing fits for electric motor style bearings (PDF - 446KB) 3. Barden Company engineering data for super precision bearings (PDF - 633KB) 4. Classification and Characteristics of Rolling Bearings (PDF - 1.85MB) 5. Comparison of the load carrying ability of different types of bearings (69KB) 6. Interchanges (PDF - 1.73MB) 7. How a Ball Bearing is made (PDF - 118KB) 8. Action Guide to Bearing Nomenclature (PDF - 4.08MB) 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: Flaking Surface of the racew ay and rolling elements peels aw ay in flakes Conspicuous hills and valleys form soon afterw ard Peeling Patches of minute flaking or peeling. Innumerable hair-line cracks visible though not yet peeling Spalling Score accompanying seizing. Mounting score in axial direction. Scores on roller end face and guide rib-cycloidal scores. Scratches in spinning direction on racew ay surface and rolling contact surfaces Smearing and Scuffing The surface becomes rough and some small deposits form. Scuffing generally refers to roughness on the race collar and the ends of the rollers Wear The surfaces w ear and dimensional deformation results. Wear is often accompanied by roughness and scratches Speckles and Discoloration Luster of racew ay surfaces is gone; surface is matted, rough, and / or evenly dimpled. Surface covered w ith minute dents Indentations / Dents and Scratches Scoring during assembly, gouges due to hard f oreign objects, and surface denting due to mechanical shock. Chipping Partial chipping of inner ring, outer ring, or rolling elements. Cracking and Notching Localized flaking occurs. Little cracks or notches appear Rust and Corrosion The surface becomes either partially or fully rusted, and occasionally rust even occurs along the rolling element pitch lines Seizing / Seizure The bearing heats up and becomes discolored. Eventually the bearing w ill seize up Fretting and Fretting Corrosion There are tw o types of fretting. In one, a rusty w ear pow der forms on the mating surfaces. In the other, brinelling indentations f orm on the racew ay at the Search Our Catalog: By Part Number
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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…
www.actionbearing.com/technical_toolbox.html 1/2
Call Us: 800.225.4587 or 617.782.1400E-mail: [email protected]
Home About Us RFQ Contact Us
Product Catalog Marketing Line Card Monthly Specials News/Articles The Bearing Detective Technical Toolbox En Espanõl
Providing Market and Industry
Specific Solutions for Bearing
Needs in the New England Region
PRODUCTS
Ball Bearings
Roller Bearings
Mounted Units
Oil Seals
Roller Chain/ Leaf Chain
Cam Followers/Yoke
Rollers
Rod Ends/Spherical
Bushings
Linear Motion
Bearing Accessories
Industry Solutions
News/Articles
Video Tutorials
Technical Toolbox
Technical Definitions and Conversion Charts
1. Inch>Decimal>Metric Conversion Chart (PDF - 270KB)
2. Shaft and housing fits for electric motor style bearings (PDF - 446KB)
3. Barden Company engineering data for super precision bearings (PDF - 633KB)
4. Classification and Characteristics of Rolling Bearings (PDF - 1.85MB)
5. Comparison of the load carrying ability of different types of bearings (69KB)
6. Interchanges (PDF - 1.73MB)
7. How a Ball Bearing is made (PDF - 118KB)
8. Action Guide to Bearing Nomenclature (PDF - 4.08MB)
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
Search Our Catalog: By Part Number
12/8/13 Bearing Failure Analysis, Bearing Spalling, Bearing Flaking & Peeling, Bearing Smearing & Scuffing, Bearing Wear, Bearing Seizure, Retainer Cage Da…
www.actionbearing.com/technical_toolbox.html 2/2
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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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