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1、EXTENDINGBEARINGLIFEAbstract：Natureworkshardtodestroybearings,buttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearingleadstooverheatingandpossiblyseizureor,atworst,anexplosion.Butevenafailedbearingleavescluesastowhatwentwrong.Afteralittl
2、edetectivework,actioncanbetakentoavoidarepeatperformance.Keywords:bearingsfailureslifeBearingsfailforanumberofreasons，butthemostcommonaremisapplication，contamination，improperlubricant，shippingorhandlingdamage，andmisalignment.Theproblemisoftennotdifficulttodiagnosebecauseafail
3、edbearingusuallyleavestelltalesignsaboutwhatwentwrong．However，whileapostmortemyieldsgoodinformation，itisbettertoavoidtheprocessaltogetherbyspecifyingthebearingcorrectlyinThefirstplace．Todothis，itisusefultoreviewthemanufacturerssizingguidelinesandoperatingcharacteristicsforthe
4、selectedbearing.Equallycriticalisastudyofrequirementsfornoise,torque,andrunout,aswellaspossibleexposuretocontaminants,hostileliquids,andtemperatureextremes.Thiscanprovidefurthercluesastowhetherabearingisrightforajob.1WhybearingsfailAbout40%ofballbearingfailuresarecausedbycont
5、aminationfromdust,dirt,shavings,andcorrosion.Contaminationalsocausestorqueandnoiseproblems,andisoftentheresultofimproperhandlingortheapplicationenvironment．Fortunately,abearingfailurecausedbyenvironmentorhandlingcontaminationispreventable，andasimplevisualexaminationcaneasilyi
6、dentifythecause．Conductingapostmortemil1ustrateswhattolookforonafailedorfailingbearing．Then，understandingthemechanismbehindthefailure,suchasbrinellingorfatigue,helpseliminatethesourceoftheproblem.Brinellingisonetypeofbearingfailureeasilyavoidedbyproperhandingandassembly.Itisc
7、haracterizedbyindentationsinthebearingracewaycausedbyshockloading－suchaswhenabearingisdropped-orincorrectassembly.Brinellingusuallyoccurswhenloadsexceedthematerialyieldpoint(350,000psiinSAE52100chromesteel)．Itmayalsobecausedbyimproperassembly,Whichplacesaloadacrossthe16races．
8、Racewaydentsalsoproducenoise，vibration，andincreasedtorque.Asimilarde
