WEO啦

首页 » 正文内容 » 外文翻译--滚动轴承
外文翻译--滚动轴承
收录时间:2022-03-04 14:31:24  浏览:217

1、附录附录1英文原文RollingContactBearingsTheconcernofamachinedesignerwithballandrollerbearingsisfivefoldasfollows/(a)lifeinrelationtoload;(b)stiffness/i/e/deflectionsunderload;(c)friction;(d)wear;(e)noise/Formoderateloadsandspeedsthecorrectselectionofastandardbearingonthebasisofloadratingwillbecomeimportantwh

2、ereloadsarehigh/althoughthisisusuallyoflessmagnitudethanthatoftheshaftsorothercomponentsassociatedwiththebearing/Wherespeedsarehighspecialcoolingarrangementsbecomenecessarywhichmayincreasefrictionaldrag/Wearisprimarilyassociatedwiththeintroductionofcontaminants/andsealingarrangementsmustbechosenwith

3、regardtothehostilityoftheenvironment/Becausethehighqualityandlowpriceofballandrollerbearingsdependsonquantityproduction/thetaskofthemachinedesignerbecomesoneofselectionratherthandesign/Rolling-contactbearingsaregenerallymadewithsteelwhichisthrough-hardenedtoabout900HV/althoughinmanymechanismsspecial

4、racesarenotprovidedandtheinteractingsurfacesarehardenedtoabout600HV/Itisnotsurprisingthat/owingtothehighstressesinvolved/apredominantformoffailureshouldbemetalfatigue/andagooddealofworkisbasedonacceptedvaluesoflifeanditisgeneralpracticeinthebearingindustrytodefinetheloadcapacityofthebearingasthatval

5、uebelowwhich90percentofabatchwillexceedalifeofonemillionrevolutions/Notwithstandingthefactthatresponsibilityforthebasicdesignofballandrollerbearingsrestswiththebearingmanufacturer/themachinedesignermustformacorrectappreciationofthedutytobeperformedbythebearingandbeconcernednotonlywithbearingselectio

6、nbutwiththeconditionsforcorrectinstallation/Thefitofthebearingracesontotheshaftorontothehousingsisofcriticalimportancebecauseoftheircombinedeffectontheinternalclearanceofthebearingaswellaspreservingthedesireddegreeofinterferencefit/Inadequateinterferencecaninduceserioustroublefromfrettingcorrosion/T

7、heinnerraceisfrequentlylocatedaxiallybyabuttingagainstashoulder/Aradiusatthispointisessentialfortheavoidanceofstressconcentrationandballracesareprovidedwitharadiusorchamfertoallowspaceforthis/Wherelifeisnotthedeterminingfactorindesign/itisusualtodeterminemaximumloadingbytheamounttowhichabearingwilld

8、eflectunderload/Thustheconceptof“staticload-carryingcapacity”isunderstoodtomeantheloadthatcanbeappliedtoabearing/whichiseitherstationaryorsubjecttoslightswivelingmotions/withoutimpairingitsrunningqualitiesforsubsequentrotationalmotion/Thishasbeendeterminedbypracticalexperienceastheloadwhichwhenappli

9、edtoabearingresultsinatotaldeformationoftherolling-elementdiameter/Thiswouldcorrespondtoapermanentdeformationof0/0025mmforaball25mmindiameter/Thesuccessfulfunctioningofmanybearingsdependsuponprovidingthemwithadequateprotectionagainsttheirenvironment/andinsomecircumstancestheenvironmentmustbeprotecte

10、dfromlubricantsorproductsofdeteriorationofthebearingdesign/Moreover/sealswhichareappliedtomovingpartsforanypurposeareofinteresttotribologistsbecausetheyarecomponentsofbearingsystemsandcanonlybedesignedsatisfactorilyonthebasisoftheappropriatebearingtheory/Notwithstandingtheirimportance/theamountofres

11、earcheffortthathasbeendevotedtotheunderstandingofthebehaviorofsealshasbeensmallwhencomparedwiththatdevotedtootheraspectsofbearingtechnology/LathesLathesarewidelyusedinindustrytoproduceallkindsofmachinedparts/Somearegeneralpurposemachines/andothersareusedtoperformhighlyspecializedoperations/EngineLat

12、hesEnginelathes/ofcourse/aregeneral-purposemachineusedinproductionandmaintenanceshopallovertheworld/Sizesrangefromsmallbenchmodelstohugeheavydutypiecesofequipment/Manyofthelargerlathescomeequippedwithattachmentsnotcommonlyfoundintheordinaryshop/suchasautomaticstopsforthecarriage/TracerorDuplicatingL

13、athesThetracerorduplicatinglatheisdesignedtoproduceirregularlyshapedpartsautomatically/Thebasicoperationofthislatheisasfallows/Atemplateofeitheraflatorthree-dimensionalshapeisplacedinaholder/Aguideorpointerthenmovesalongthisshapeanditsmovementcontrolsthatofthecuttingtool/Theduplicationmayincludeasqu

14、areortaperedshoulder/grooves/tapers/andcontours/Worksuchasmotorshafts/spindles/pistons/rods/caraxles/turbineshafts/andavarietyofotherobjectscanbeturnedusingthistypeoflathe/TurretLathesWhenmachiningacomplexworkpieceonageneral-purposelathe/agreatdealoftimeisspentchangingandadjustingtheseveraltoolsthat

15、areneededtocompletethework/Oneofthefirstadaptationsoftheenginelathewhichmadeitmoresuitabletomassproductionwastheadditionofmulti-toolturretinplaceofthetailstock/Althoughmostturretshavesixstations/somehaveasmanyaseight/High-productionturretlathesareverycomplicatedmachineswithawidevarietyofpoweraccesso

16、ries/Theprincipalfeatureofallturretlathes/however/isthatthetoolscanperformaconsecutiveserialsofoperationsinpropersequence/Oncethetoolshavebeensetandadjusted/littleskillisrequiredtorunoutduplicateparts/AutomaticScrewMachinesScrewmachinesaresimilarinconstructiontoturretlathes/exceptthattheirheadsarede

17、signedtoholdandfeedlongbarsofstock/Otherwise/thereislittledifferentbetweenthem/Botharedesignedformultipletooling/andbothhaveadaptationsforidenticalwork/Originally/theturretlathewasdesignedasachuckinglatheformachiningsmallcastings/forgings/andirregularlyshapedworkpieces/Thefirstscrewmachinesweredesig

18、nedtofeedbarstockandwireusedinmakingsmallscrewparts/Today/however/theturretlatheisfrequentlyusedwithacolletattachment/andtheautomaticscrewmachinecanbeequippedwithachucktoholdcastings/Thesingle-spindleautomaticscrewmachine/asitsnameimplies/machinesworkononlyonebarofstockatatime/Abar16to20feetlongisfe

19、dthroughtheheadstockspindleandisheldfirmlybyacollect/Themachiningoperationsaredonebycuttingtoolsmountedontheturretandonthecrossslide/Whenthemachineisinoperation/thespindleandthestockarerotatedatselectedspeedsfordifferentoperations/Ifrequired/rapidreversalofspindledirectionisalsopossible/Inthesingle-

20、spindleautomaticscrewmachine/aspecificlengthofstockisautomaticallyfedthroughthespindletoamachiningarea/Atthispoint/theturretandcrossslidemoveintopositionandautomaticallyperformwhateveroperationsarerequired/Afterthemachinedpieceiscutoff/stockisagainfedintothemachiningareaandtheentirecycleisrepeated/M

21、ultiple-spindleautomaticscrewmachineshavefromfourtoeightspindleslocatedaroundaspindlecarrier/Longbarsofstock/supportedattherearofthemachine/passthroughthesehollowspindlesandaregrippedbycollets/Withthesinglespindlemachine/theturretindexesaroundthespindle/Whenonetoolontheturretisworking/theothersareno

22、t/Withamultiplespindlemachine/however/thespindleitselfindexes/Thusthebarsofstockarecarriedtothevariousendworkingandsideworkingtools/Eachtooloperatesinonlyoneposition/butalltoolsoperatesimultaneously/Therefore/fourtoeightworkpiecescanbemachinedatthesametime/VerticalTurretLathesAverticalturretlatheisb

23、asicallyaturretlathethathasbeenstoodonitsheadstockend/Itisdesignedtoperformavarietyofturningoperations/Itconsistsofaturret/arevolvingtable/andasideheadwithasquareturretforholdingadditionaltools/Operationsperformedbyanyofthetoolsmountedontheturretorsideheadcanbecontrolledthroughtheuseofstops/Machinin

24、gCentersManyoftodaysmoresophisticatedlathesarecalledmachiningcenterssincetheyarecapableofperforming/inadditiontothenormalturningoperations/certainmillinganddrillingoperations/Basically/amachiningcentercanbethoughtofasbeingacombinationturretlatheandmillingmachine/Additionalfeaturesaresometimesinclude

25、dbymanufacturerstoincreasetheversatilityoftheirmachines/NumericalControlOneofthemostfundamentalconceptsintheareaofadvancedmanufacturingtechnologiesisnumericalcontrol(NC)/PriortotheadventofNC/allmachinetoolsweremanuallyoperatedandcontrolled/Amongthemanylimitationsassociatedwithmanualcontrolmachinetools/perhapsnoneismoreprominentthanthelimitationof

温馨提示:
1. WEO啦仅展示《外文翻译--滚动轴承》的部分公开内容,版权归原著者或相关公司所有。
2. 文档内容来源于互联网免费公开的渠道,若文档所含内容侵犯了您的版权或隐私,请通知我们立即删除。
3. 当前页面地址:https://www.weo.la/doc/d1fab29b074d6091.html 复制内容请保留相关链接。