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外文翻译--凸轮.doc

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外文翻译--凸轮.doc

6.附录6.1英文原文CamsVariousmotionscanbeproducedbytheactionofacamagainstafollower.Mamytimingdevicesareoperatedbycanaction.Thepurposeofandycamistoproduceadisplacementofitsfollowerasecondaryfollowerisoften.usedtoproduceadditionaldisplacementinanotherlocation.Themostpopulartypeistheplatecam.Thecylindricaltypeisusedtotransmitlinearmotiontoafollowerasthecamrotates.Threedimensionalcamaresometimesusedtheseprovidesomeunusualfollowermotions,butalsomakefollowerdesigndifficult.Thecamshaftintheautomotiveengineillustratesasimplebutimportantapplicationofalatecam.Thecamassembliesinautomaticrecordplayersillustrateasomewhatmorecomplexapplication.Camprofilesareaccuratelyconstructedbyeitherpraphicalormathematicalmethods.Thetransitiomfromdevelopmentdrawingstoworkingshopdrawingcanbemadeinseveralways1.Makeafullscaletemplate.Thisisdesirablefromthemanufacturingstandpoint,butitwillnotguaranteeaccuratecamprofiles.2.Useradialdimensions.Thisisfairlyaccurate,butsometimesproduceslayoutproblemsintheshop.3.Usecoordinatedimensioning.Thisprocedurewillensureaccuracy.Inselecringoneofthesemethods,oneshouldconsiderthefunctionofthecamintermsofdesiredpreciseness.Becausethecamworkoutlinealreadydetermined,thereforethecamstructuraldesignmainlywasdeterminesthecurveoutlineaxialthicknessandthecamandthedriveshaftconnectionway.Whentheworkloadcomparesthehour,curveoutlineaxialthicknessgenerallytakesfortheoutlinecurvebiggestradiusofvector1,/10~/5Regardingastressbiggerimportantsituation,mustwithcarryonthedesignaccordingtothecamcontoursurfacefromthecontactintensity.Whendeterminationcamanddriveshaftjointway,shouldsynthesizetheconsiderationcamtheassemblinganddismantling,theadjustmentandfirmlygradesthequestion.Regardingimplementingagencymoreequipment,betweenitseachexecutioncomponentmovementcoordinationusuallydeterminedbythecycleofmotionchart,thereforeinassemblycamgeartime,thecamcontourcurveinitialstationpushesregulationstartstherelativepositiontohaveaccordingtothecycleofmotioncharttocarryontheadjustment,guaranteeseachexecutioncomponenttobeableaccordingtothepresetsequencesynchronizedaction.Therefore,requeststhecaminthestructuraldesigntobeabletobeoppositetothedriveshaftcarriesontherotationalongthecircumferencedirection,andreliablyperformsfixedly.Thesimplestmethodusestheclampingscrewnailfixedcam,orwithclampingscrewnailprefixed,aftertreatsadjustsusesthepintobefixedagain.FromstructuraldesignfromstructureWhendesignmustconsiderfromtheguidanceandpreventedrevolves.FrommovementruledesignInvolvesmanyaspectsfromthemovementruledesignthequestions,besidesconsiderationrigidityimpactandflexibleimpact,butalsoshouldmaximumspeedvmaxwhichhastoeachkindofmovementrule,maximumaccelerationamaxanditstheinfluenceperformsthecomparison.1vmaxbigger,thenmomentummvisbigger.Iffromissuddenlyprevented,theoversizedmomentumcancausetheenormousimpulse,endangerstheequipmentandthepersonalsafety.Therefore,whenisbiggerfromthequality,inordertoreducethemomentum,shouldchoosethevmaxvaluesmallermovementrule.2amaxbigger,isbigger.Functioninhighvicecontactplacestressbigger,theorganizationintensityandthewearresistantrequestisalsohigher.Regardinghighspeedcam,inordertoreducetheharm,shouldchoosetheamaxvaluesmallermovementrule.Firststatesseveralkindofmovementsrulesvmax,amax,theimpactcharacteristicandthesuitablesituationfollowingtableregardingswingsfromthecamgear,itsmovementgraphxcoordinateexpressioncamcorner,ycoordinatethenseparatelyexpressesfrom,angularspeedandangleacceleration.Thiskindofmovementgraphhasthestateofmotionandaboveissame.FromstructuraldesignfromstructureWhendesignmustconsiderfromtheguidanceandpreventedrevolves.FrommovementruledesignThecamgeardesignbasicquestion1.camgearstypechoice,thedefinitecamshape,withfrommaintainsthehighvicecontactfromtheshapeandthemovementformandthecamtheway2.fromthemovementruledesign,accordingtotheapplicationsituationtofromthetravellingscheduleandthestateofmotionrequest,determinesfromthemovementrule.3.camgearsbasicparameterdesign,determinesfromthetravellingschedule,variousmovementsangle,thecamradius,,therollerradius,thecenterdistance,fromthelengthandsoon.4.camcontourscurvedesign.5.camgearsbearingcapacitycomputation.6.camgearsstructuraldesign,planorganizationassemblydrawingandvariouscomponentsshopdrawingFromstructuraldesignfromstructureWhendesignmustconsiderfromtheguidanceandpreventedrevolves.FrommovementruledesignThecamgeardesignbasicquestion1.camgearstypechoice,thedefinitecamshape,withfrommaintainsthehighvicecontactfromtheshapeandthemovementformandthecamtheway2.fromthemovementruledesign,accordingtotheapplicationsituationtofromthetravellingscheduleandthemovement1,thecamgearapplicationcamgearisincludesthecamthehighviceorganization,thecamgearhasthestructuretobesimple,mayaccuratelyrealizerequestmeritandsoonmovementrule,thusobtainsthewidespreadapplicationintheindustrialproduction,speciallyautomaticdeviceandintheautomaticcontroldevice,obtainsthewidespreadapplication.2nd,thecamgearclassificationaccordingtotwomovestherelativemotioncharacteristicclassificationbetweenthecomponent1theplanecamgear1thediskcam2translationcam.2spacecamgearaccordingtofrommovementviceelementshapeclassification1apexfrom2rollerfrom3flatbasefrom.NoteClassifiesthispartofcontentwhentheintroductioncamgear,shouldpointouteachkindofcamgearthegoodandbadpointsanditstheadaptionsituation,showedeachkindofcamgeartheinnerlink,willbuildthefoundationforthelatertranslationcamandthecolumncamcontourdesign.3rd,thethrowoutlevermovementrule1thecamgearcycleofmotionandthebasictermterminologypushtheregulationmovementangleWithfrompushesthecamcornerwhichtheregulationcorrespondsFarstopstheangleWithfromfarreststhecamcornerwhichtheregulationcorrespondsReturntripmovementangleWithcamcornerwhichcorrespondsfromthereturntripNearlystopstheangleWithfromnearlyreststhecamcornerwhichtheregulationcorrespondsCamTakethecamaxlecenterasthecenterofacircle,takeitsoutlineslightlytodiameterr0astheradiuscircleFromravellingscheduleInpushesintheregulationorthereturntripfromthebiggestdisplacement,indicatedwithhThecamcenterofrotationwithfromguideswaythebiasdistance,indicatedwithe.TypesofCamsPlatecamsaresimpletofabricate.Thefollowercanbemovedinvariouspatternswithvariousrise/fallratios.Motionshouldbecontrolledtoavoidabruptchangesinforcetransmittedfromthecamtothefollower.Oneshouldcarefullydeterminehorizontalforcecomponents,sincethesepresentproblemsdesigningthefollowerassemblyguide.CriticalreactionsoccuratpointsAandB.Thesereactionvaluesmustbecomputed.TherelativeverticalpositionofpointAwithrespecttoBneedstoberaisedifthereactionvalueatBisexcessive.ThepositionofBshouldbeasclosetocamaspossibletominimizeflexureintherollerfollowersupport.Thistypeproducesreciprocatingmotioninthefollower.Again,dorcesneedtobedeterminedanddimensionschosensoastoavoidexcessivecomponentsizes.Ataperedrollerfollowerisfrequentlyemployedthegrooveintheperipheryofthecamshouldbeshapedtoaccommodatethefollower.Thistypeofcamisexpensivetoproduce.Thecylindricalcamhastwooutstandingfeatures.Oneisthefactthatthecamispositiveactiong.Noutsideforcessuchasgravityorspringactionareneededtoholdthefolloweragainsttheworkingsurfaceofthecam.Thesecondfeatureisthefactthatthefollowercanmovethroughacompletecycleinthecourseofseveralrevolutionsofthecam.Forexample,itispossibletodesignthecamsothefollowercouldmovefromastartingpositionattheleftendtotheextremerightpositioninthreerevolutionsormore,thenthestartingpositionintworevolutions.Othervariationsarepossible.Atranslationcamisillustrated.Inthefigureshownthecamreciprocateshorizontallyandthefollowermovesupanddown.Apivotedfollowercanbeusedwiththistype.Thetranslationcamcanbemadepositivebyprovidingaguidedplatewithaninclinedslotforthecamtheslotcamthenengageapinorrolleronaguided

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