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1、外文文献翻译(含：英文原文及中文译文)英文原文EXTENDINGBEARINGLIFEAbstractNatureworkshardtodestroybearings,buttheirchancesofsurvivalcanbeimprovedbyfollowingafewsimpleguidelines.Extremeneglectinabearingleadstooverheatingandpossiblyseizureor,atworst,anexplosion.Butevenafailedbe
2、aringleavescluesastowhatwentwrong.Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.Keywords:bearingsfailureslifeTherearemanycausesofbearingfailure,butcommononesareimproperuse,contamination,improperuseoflubricants,damageduringinstallat
3、ionorhandling,andmountingerrors.Itisnotdifficulttodiagnosethecauseofthefailurebecausethetracesleftonthebearingscandeterminethecauseofthebearingfailure.However,whenpost-hocinvestigationsprovidevaluableinformation,itisbesttoavoidfailurescompletelybyproper
4、lyselectingthebearingsfirst.Inordertodothis,itisimportanttoreviewthemanufacturer'sdimensionalpositioningguidelinesandtheusecharacteristicsoftheselectedbearings.1CauseofbearingfailureAbout40%ofballbearingfailuresarecausedbydust,dirt,debris,andcorrosion.C
5、ontaminationisusuallycausedbyincorrectuseandpooruseoftheenvironment.Italsocausesproblemswithtorqueandnoise.Bearingfailurescausedbytheenvironmentandcontaminationarepreventable,andsimplevisualinspectioncandeterminethecauseofsuchfailures.Throughpost-failur
6、eanalysis,youcanfindoutwhataspectsofbearingsthathavefailedorareabouttofailshouldbeviewed.Understandingthemechanismsoffailuresuchaserosionandfatiguefailurecanhelpeliminatetherootcauseoftheproblem.Aslongasitisusedandinstalledproperly,erosionofthebearingis
7、easilyavoided.Erosionischaracterizedbythepresenceofindentationsontheracewaysofthebearingringcausedbyimpactloadsorincorrectinstallation.Erosionusuallyoccurswhentheloadexceedstheyieldlimitofthematerial.Iftheinstallationisincorrectsothataloadtraversingtheb
8、earingringcanalsoproduceerosion.Thepitsonthebearingringsalsoproducenoise,vibrationandadditionaltorque.Asimilardefectistheellipticalindentationthatoccurswhenthebearingdoesnotrotateduetotheballoscillatingbetweenthebearingrings.This
