延长轴承有效期 毕业论文外文翻译

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1、外文资料原文外文资料原文EXTENDINGBEARINGLIFEBearingsfailforanumberofreasons，butthemostcommonaremisapplication，contamination，improperlubricant，shippingorhandlingdamage，andmisalignment.Theproblemisoftennotdifficulttodiagnosebecauseafailedbearingusuallyleavestelltalesignsaboutwhatwentwrong．However，whileapostmortem

2、yieldsgoodinformation，itisbettertoavoidtheprocessaltogetherbyspecifyingthebearingcorrectlyinThefirstplace．Todothis，itisusefultoreviewthemanufacturerssizingguidelinesandoperatingcharacteristicsfortheselectedbearing.Equallycriticalisastudyofrequirementsfornoise,torque,andrunout,aswellaspossibleexposur

3、etocontaminants,hostileliquids,andtemperatureextremes.Thiscanprovidefurthercluesastowhetherabearingisrightforajob.1.WhybearingsfailAbout40%ofballbearingfailuresarecausedbycontaminationfromdust,dirt,shavings,andcorrosion.Contaminationalsocausestorqueandnoiseproblems,andisoftentheresultofimproperhandl

4、ingortheapplicationenvironment．Fortunately,abearingfailurecausedbyenvironmentorhandlingcontaminationispreventable，andasimplevisualexaminationcaneasilyidentifythecause．Conductingapostmortemil1ustrateswhattolookforonafailedorfailingbearing．Then，understandingthemechanismbehindthefailure,suchasbrinellin

5、gorfatigue,helpseliminatethesourceoftheproblem.Brinellingisonetypeofbearingfailureeasilyavoidedbyproperhandingandassembly.Itischaracterizedbyindentationsinthebearingracewaycausedbyshockloading－suchaswhenabearingisdropped-orincorrectassembly.Brinellingusuallyoccurswhenloadsexceedthematerialyieldpoint

6、(350,000psiinSAE52100chromesteel)．Itmayalsobecausedbyimproperassembly,Whichplacesaloadacrosstheraces．Racewaydentsalsoproducenoise，vibration，andincreasedtorque.Asimilardefectisapatternofellipticaldentscausedbyballsvibratingbetweenracewayswhilethebearingisnotturning．Thisproblemiscalledfalsebrinelling.

7、Itoccursonequipmentintransitorthatvibrateswhennotinoperation.Inaddition,debriscreatedbyfalsebrinellingactslikeanabrasive,furthercontaminatingthebearing.外文资料原文Unlikebrinelling,falsebinellingisoftenindi