王雷-外文翻译

王雷-外文翻译

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时间:2019-08-27

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1、外文原文EXTENDINGBEARINGLIFEAbstract:Natureworkshardtodestroybearings,buttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearingleadstooverheatingandpossiblyseizureor,atworst,anexplosion.Butevenafailedbearingleavescluesastowhatwentw

2、rong.Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.Keywords:bearingsfailureslifeBearingsfailforanumberofreasons,butthemostcommonaremisapplication,contamination,improperlubricant,shippingorhandlingdamage,andmisalignment.Theproblemisoftennotdif

3、ficulttodiagnosebecauseafailedbearingusuallyleavestelltalesignsaboutwhatwentwrong.However,whileapostmortemyieldsgoodinformation,itisbettertoavoidtheprocessaltogetherbyspecifyingthebearingcorrectlyinThefirstplace.Todothis,itisusefultoreviewthemanufacturerssizinggui

4、delinesandoperatingcharacteristicsfortheselectedbearing.Equallycriticalisastudyofrequirementsfornoise,torque,andrunout,aswellaspossibleexposuretocontaminants,hostileliquids,andtemperatureextremes.Thiscanprovidefurthercluesastowhetherabearingisrightforajob.1Whybear

5、ingsfailAbout40%ofballbearingfailuresarecausedbycontaminationfromdust,dirt,shavings,andcorrosion.Contaminationalsocausestorqueandnoiseproblems,andisoftentheresultofimproperhandlingortheapplicationenvironment.Fortunately,abearingfailurecausedbyenvironmentorhandling

6、contaminationispreventable,andasimplevisualexaminationcaneasilyidentifythecause.Conductingapostmortemil1ustrateswhattolookforonafailedorfailingbearing.Then,understandingthemechanismbehindthefailure,suchasbrinellingorfatigue,helpseliminatethesourceoftheproblem.Brin

7、ellingisonetypeofbearingfailureeasilyavoidedbyproperhandingandassembly.Itischaracterizedbyindentationsinthebearingracewaycausedbyshockloading-suchaswhenabearingisdropped-orincorrectassembly.Brinellingusuallyoccurswhenloadsexceedthematerialyieldpoint(350,000psiinSA

8、E52100chromesteel).Itmayalsobecausedbyimproperassembly,Whichplacesaloadacrosstheraces.Racewaydentsalsoproducenoise,vibration,andincreasedtorque.Asimilar

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