会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--基本额定动负荷与寿命.doc

  • 资源星级:
  • 资源大小:60.50KB   全文页数:7页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--基本额定动负荷与寿命.doc

英文原文BasicDynamicLoadRatingandLifeLifeRollingbearingswillsufferdamageduetovariouscausesduringservice.Damagesuchasabnormalwear,seizure,andcracksiscausedbyimproperuse,includingincorrectmounting,lackofoil,dustintrusionandsoon,andcanbeavoidedbyremedyingthesecauses.However,bearingswilleventuallybedamagedduetofatigueflakingevenifusedproperly.Whenabearingrotatesunderload,theracewaysandtherollingelementsaresubjectedtorepeatedstressesconcentratedonthepartclosetothesurface.Fatigue,therefore,occursinthesurfacelayer,producingdamageintheformofscaling.Thisiscalledflakingspalling.Whenthisoccurs,thebearingcannolongerbeused.BearingLifeBearinglifeisdefinedasthetotalnumberofrevolutionsortotalservicehoursataconstantrotationalspeedbeforeasignofthefirstflakingappearsontherollingsurfaceofracewayorrollingelements.However,evenwhenbearingsofthesamesize,structure,materialandheattreatmentaresubjectedtothesameconditions,thebearingliveswillshowvariation.Thisresultsfromthestatisticalnatureofthefatiguephenomenon.Inselectingabearing,itisincorrecttotakeanaveragelifeforallbearingsasthedesignstandard.Itismorepracticaltoconsiderabearinglifethatisreliableforthegreaterproportionofbearingsused.Therefore,thebasicratinglifedefinedinthefollowingisused.BasicratinglifeThebasicratinglifeisdefinedasthetotalnumberofrevolutionsthat90ofagroupofidenticalbearingscanbeoperatedindividuallyunderthesameconditionsfreefromanymaterialdamagecausedbyrollingfatigue.Forrotationataconstantrotationalspeed,thebasicratinglifecanberepresentedbythetotalservicehours.BasicdynamicloadratingThebasicdynamicloadratingisdefinedastheconstantradialloadinthecaseofradialbearingsortheconstantaxialloadactingalongthebearingcentralaxisinthecaseofthrustbearingsthatallowsabasicratinglifeof1,000,000revolutionsIKOCamFollowersarebearingswithastudincorporatingneedlerollersinathickwalledouterring.Thesebearingsaredesignedforouterringrotation,andhavesuperiorrotationalperformancewithasmallcoefficientoffrictionandhighloadcapacity.Asstudsalreadyhavethreadsorsteps,theyareeasytomount.CamFollowersarefollowerbearingsforcammechanismsandlinearmotionsandhavehighrigidityandhighaccuracy.Theyare,therefore,usedwidelyformachinetools,industrialrobots,electronicdevices,andOAequipment.StainlesssteelmadeCamFollowersaresuperiorincorrosionresistanceandsuitableforapplicationsinenvironmentswhereoilcannotbeusedorwatersplashed,andincleanrooms.Types1、StandardTypeCamFollowersThesearethebasictypebearingsinIKOCamFollowerseries.Modelswithstuddiametersrangingfrom3to30mmareprepared,andaresuitableforawiderangeofapplications.2、SolidEccentricStudTypeCamFollowersThestudofthesebearingsiseccentrictothecenteraxisoftheouterring.Thus,thepositionoftheouterringintheradialdirectioninrelationtothematingtracksurfacecaneasilybeadjustedbyturningthestud,andtheloaddistributiononanumberofcamfollowerouterringsusedonthesametracksurfacecanbemadeuniform.TheseareeccentriccamfollowerswithaonepiecestudthatcanbemountedinthesamemountingholesasthoseforStandardTypeCamFollowers.Eccentricityis0.25mm~0.6mm.3、EccentricTypeCamFollowersInthesebearings,aneccentriccollarisassembledwiththeCamFollowerstud,enablingtheouterringtobepositionedeasilyintheradialdirectionagainstthematingtracksurface.Eccentricityis0.4~1.5mm.4、ThrustDiskTypeCamFollowersThesebearingshavespecialresinthrustdiskwasherssuperiorinwearandheatresistancebetweentheslidingsurfacesofouterringshoulders,studheadandsideplate.Thesediskwashersreducefrictionandwearduetoaxialloadscausedbymisalignment,etc.5、CentralizedLubricationTypeCamFollowersThesebearingshaveoneortwopipethreadedholesinthestud.Thus,thisseriesissuitablewhencentralizedlubricationisrequired.6、EasyMountingTypeCamFollowersThesebearingshaveasteppedtaperedportiononthestud.WhenmountingtheCamFollower,itiseasytofixitslocationbytighteningasetscrewtothesteppedportion.Thus,thistypeissuitablewhenalargenumberofCamFollowersareusedinamachinesuchasapalletchanger.7、ClubeCamFollowerThesebearingsarelubricatedwithanewlydevelopedthermosettingsolidtypelubricantwhichfillstheinnerspaceofthebearing.Thislubricantprovideslongtermmaintenancefree.8、HeavyDutyTypeCamFollowersThesebearingsarefullcomplementtypebearingsincorporatingdoublerowsoffullcomplementcylindricalrollersintheouterring,andcanwithstandlargeradialloadsandsomeaxialloads.9、MiniatureTypeCamFollowersThesearecompactlydesignedbearings,incorporatingverythinneedlerollersinanouterringwithasmalloutsidediameter.Theyareusedinelectronicdevices,OAequipment,smallindexdevices,etc.10、InchseriesCamFollowersTwotypes,CRandCRH,areavailableintheInchseriesCamFollowers.BlackoxidefilmtreatmentismadeonCRHmodels.MaximumAllowableStaticLoadTheapplicableloadonCamFollowersis,insomecases,limitedbythebendingstrengthandshearstrengthofthestudandthestrengthoftheouterringinsteadoftheloadratingoftheneedlerollerbearing.Therefore,themaximumallowablestaticloadthatislmitedbythesestrengthsisspecified.TrackCapacityTrackcapacityisdefinedasaloadwhichcanbecontinuouslyappliedonaCamFollowerplacedonasteeltracksurfacewithoutcausinganydeformationorindentationonthetracksurfacewhentheouterringoftheCamFollowermakescontactwiththematingtracksurfaceplane.Iflubricationbetweentheouterringandthematingtracksurfaceisinsufficient,seizureand/orwearmayoccurdependingontheapplication.Therefore,attentionmustbepaidtolubricationandsurfaceroughnessofthematingtrackespeciallyforhighspeedrotationssuchascammechanisms.OperatingTemperatureRangeTheoperatingtemperaturerangeforCamFollowersis20.゜C~120゜C.However,themaximumallowabletemperatureforthefollowingtypesisdifferent.ThemaximumallowabletemperaturefortheMetricCFserieswithastuddiameterd1of4mmorlessandCFS2is110゜C,and100゜Cwhentheyarecontinuouslyoperated.Themaximumallowabletemperatureforthesealedtypewithastuddiameterd1of5mmorlessis80゜C.Mounting1、MakethecenteraxisofthemountingholeperpendiculartothemovingdirectionoftheCamFollowerandmatchthesideshoulderaccuratelywiththeseatingsurfaceindicatedbydimensionfinthetableofdimensions.Then,fixtheCamFollowerwiththenut.DonothittheflangeheadoftheCamFollowerdirectlywithahammer,etc.Thismayleadtoabearingfailuresuchasirregularrotationorcracking.2、TheIKOmarkontheflangeheadofthestudindicatesthepositionoftheoilholeontheraceway.Avoidlocatingtheoilholewithintheloadingzone.Thismayleadtoashortbearinglife.Theholelocatedinthemiddlepartofthestudperpendiculartothestudcenteraxisisusedforgreasingorlocking3、Whentighteningthenut,thetighteningtorqueshouldnotexceedthevaluesshowninthetableofdimensions.Ifthetighteningtorqueistoolarge,itispossiblethatthethreadedportionofthestudwillbebroken.Whenthereisapossibilityofloosening,aspecialnutsuchasalocknut,springwasher,orselflockingnutshouldbeused.4、InthecaseofSolidEccentricStudTypeCamFollowersandEccentricTypeCamFollowers,theouterringpositioncanbeadjustedappropriatelybyturningthestudwithascrewdriverorhexagonbarwrenchusingthescrewdriverslotorhexagonholeofthestudhead.Thestudisfixedwithanutandaspringwasher,etc.Thetighteningtorqueshouldnotexceedthevaluesofmaximumtighteningtorqueshowninthetableofdimensions.Whenshockloadsareappliedandtheadjustedeccentricityhastobeensured,itisrecommendedtomakeholesinthehousing,studandeccentriccollar,andfixthestudwithadowelpinasshowninfollowing.However,whenthestuddiameterislessthan8mmEccentriccollardiameter11mm,itisdifficulttomakeaholeinthestudbecausethestudisthroughhardened.5、IncaseofEccentricTypeCamFollowersCFE,thelengthofthemountingholeshouldbemorethan0.5mmlongerthanthedimensionofEccentriccollarwidth.6、FormountingEasyMountingTypeCamFollowers,itisrecommendedtofixthefixingscrewfromtheuppersidetothesteppedportionofthestud.InspectionofbearingCleaningofbearingWheninspectingabearingafterremoval,theappearanceofthebearingshouldberecordedfirst.Then,aftertheresidualamountoflubricantischeckedandasampleoflubricantiscollected,thebearingshouldbecleaned.Forcleaning,lightoilorkeroseneiscommonlyused.Cleaningisdividedintoroughcleaningandfinalcleaning,andwiregauzeissetasaraisedbottominacontainertopreventthebearingfromtouchingthebottomofthecontainer.Lubricatinggreaseandadheringsubstancessuchasforeignparticlesareremovedwithabrush,etc.,usingoilforroughcleaning.Careshouldbetakenduringthisprocess,becauseifthebearingisturnedwithforeignparticlesattached,theracewaysurfacesmaybescratched.Finalcleaningiscarriedoutbyturningthebearingincleaningoil.Itisdesirablethatthecleaningoiliskeptcleanbyfiltering.Immediatelyaftercleaning,thebearingmustbeprotectedagainstcorrosion.InspectionandevaluationofbearingThejudgmentastowhethertheremovedbearingisreusabledependsontheinspectionaftercleaning.Conditionsoftheracewaysurfaces,rollingelementsandfittingsurfaces,wearconditionofthecage,increaseofbearingclearance,dimensions,rotationalaccuracy,etc.shouldbecheckedfordamageandabnormalities.Theevaluationisperformedbasedontheexperiencetakingintoconsiderationthedegreeofdamage,machineperformance,importanceofthemachine,operatingconditions,perioduntilthenextinspection,andothersuchfactors.MaintenanceandinspectionMaintenanceandinspectionarecarriedouttomaintaingoodperformanceofbearingsinstalledinthemachine.Maintenanceisperformedbycheckingthemachineoperatingconditions,checkingandreplenishingorreplacingthelubricant,checkingthebearingandrelatedpartsbyperiodicdisassemblyandothersuchprocedures.Itemsforinspectionofarunningbearinginamachineincludethebearingtemperature,noise,vibrationandconditionoflubricant.Damage,causesandcorrectiveactionRollingbearingscangenerallybeusedfullyuptotheirrollingfatiguelifeiftheyareproperlyselected,mounted,operatedandmaintained.However,theymayactuallybedamagedearlierthantheirexpectedlifetimescreatingproblemsoraccidents.Commoncausesofdamageincludeimpropermountingorhandling,insufficientlubricationandpenetrationofforeignparticles.Itmaybedifficulttodeterminetheexactcauseofaproblembycheckingonlythedamagedbearing.Theconditionsofthemachinebeforeandaftertheoccurrenceofthedamage,thelocationandtheoperatingandambientconditionsofthebearing,thestructurearoundthebearing,etc.shouldalsobeexamined.Itthenbecomespossibletoassessthecauseofthedamagebylinkingtheconditionsofthedamagedbearingtotheprobablecausesarisingfromthemachineoperation,andtopreventtherecurrenceofsimilarproblems.

注意事项

本文(外文翻译--基本额定动负荷与寿命.doc)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5