机械设计与制造英文翻译.docx

机械设计与制造英文翻译

第一篇：机械设计与制造英文翻译外文翻译HowtoextendtheservicelifeofbearingNature'sharshworkingconditionscanleadtothefailureofbearing,butifyoufollowsomesimplerules,opportunitiesfornormaloperationofthebearingcanbeimproved.Intheusingprocessofbearing,extremeneglectinabearingleadstooverheatingandpossiblyseizureor,atworst,anexplosion.Butevenafailedbearingleavescluesastowhatwentwrong.Afteralittledetectivework,actioncanbetakentoavoidarepeatperformance.Someofthereasonsforbearingfailure,butcommonisincorrectuseofimproperuse,pollution,lubricants,loadingandunloadingorhandlingdamageandinstallationerror,etc.Theproblemisoftennotdifficulttodiagnose,becauseofafailedbearingusuallyleavingtheslightesttracewhatwentwrong.However，whileapostmortemyieldsgoodinformation，itisbettertoavoidtheprocessaltogetherbyspecifyingthebearingcorrectlyinThefirstplace．Todothis，itisusefultoreviewthemanufacturerssizingguidelinesandoperatingcharacteristicsfortheselectedbearing.Equallyimportantistheresearchrequirementofnoise,torque,beating,andpossibleexposuretopollutants,hostileliquid,andextremetemperatures.Whethercanprovidefurthercluesbearingissuitableforthiswork.bearingfailurereasonenvironmentalvibration.Alsoalightpreloadonthebearinghelpskeeptheballsandracewayintightcontact.Preloadingalsohelpspreventfalsebrinellingduringtransit.Seizurescanbecausedbyalackofinternalclearance,improperlubrication,orexcessiveloading.Beforeseizing,excessive,frictionandheatsoftensthebearingsteel.Overheatedbearingsoftenchangecolor，usuallytoblue-blackorstrawcolored．Frictionalsocausesstressintheretainer，whichcanbreakandhastenbearingfailure．Prematurematerialfatigueiscausedbyahighloadorexcessivepreload．Whentheseconditionsareunavoidable，bearinglifeshouldbecarefullycalculatedsothatamaintenanceschemecanbeworkedout．Anothersolutionforfightingprematurefatigueischangingmaterial．Whenstandardbearingmaterials，suchas440CorSAE52100，donotguaranteesufficientlife，specialtymaterialscanberecommended.Inaddition，whentheproblemistracedbacktoexcessiveloading，ahigherc