外文翻译--凸轮形状设计的混合方法和一般的盘形凸轮轮廓加工的机制 英文版.pdf外文翻译--凸轮形状设计的混合方法和一般的盘形凸轮轮廓加工的机制 英文版.pdf

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INTERNATIONALJOURNALOFPRECISIONENGINEERINGANDMANUFACTURINGVOL11,NO3,PP419427JUNE2010/419DOI101007/S12541010004861INTRODUCTIONPLATECAMMECHANISMISAWIDELYUSEDMACHINECOMPONENTWITHTHECONTINUOUSCONTACTMOTIONOFCAMANDFOLLOWER,ANDCANEASILYPRODUCEANYFUNCTIONALMOTIONOFFOLLOWERDUETOTHEROTATIONOFCAMCAMMECHANISMHASTHEDIVERSETYPESBYTHECOMBINATIONOFDIFFERENTSHAPEOFCAMANDMOTIONOFFOLLOWER;PLATEORCYLINDRICALCAM,ROLLERORFLATFACEDFOLLOWER,ANDRECIPROCATINGOROSCILLATINGMOTIONINSPITEOFTHEADVANTAGESOFAFEWNUMBEROFLINKS,SIMPLESTRUCTURE,POSITIVEMOTION,ANDCOMPACTSIZE,CAMMECHANISMSREQUIRETHEACCURATESHAPEDESIGNANDPRECISEMACHININGPROCEDURESFORSATISFYINGTHEMECHANICALREQUIREMENTSUNDERTHELOWLEVELEDDESIGNANDMANUFACTURING,CAMMECHANISMSGIVETHEHEAVYEFFECTSONVIBRATION,NOISE,SEPARATION,ANDOVERLOADINGTOANOVERALLSYSTEMTOAVOIDTHESEEFFECTS,CAMMECHANISMMUSTBEWELLDESIGNEDACCURATELYANDMACHINEDPRECISELYACTUALLY,AHYBRIDCAD/CAMAPPROACHMAYBETHEBESTSOLUTIONTHATTHESHAPEDATAFROMTHEDESIGNPROCESSAREDIRECTLYCOMBINEDTOTHEMACHININGDATAFORTHEMANUFACTURINGPROCESSLINEINTERPOLATIONANDCIRCULARINTERPOLATIONARECOMMONLYUSEDINCONSTRUCTIONOFTHEMACHININGDATAFROMTHEPROFILEDATAOFCAMLINEINTERPOLATIONHASTHELOWACCURACYANDCIRCULARINTERPOLATIONCANNOTKEEPTHEACCURACYBECAUSEOFTHEDISCONNECTIVERADIIOFCURVATURESORTHEDISCONTINUOUSSLOPESATTHECONNECTEDPOINTBYTWOCIRCULARARCSASPRESENTEDINSHINETAL13RECENTLY,PARAMETERICINTERPOLATIONUSINGBSPLINEANDNURBSCURVEARESUGGESTEDINJUNGETAL5ANDYANGETAL6ALSOBIARCINTERPOLATIONISWIDELYUSEDANDDEEPLYDEPENDENTONTHEDIRECTIONANGLETOWARDCENTERSOFBIARCCURVESBOLTON7DESCRIBEDABIARCCURVEBASEDONTHETANGENTIALANGLESATTWOPOINTS,PARKINSONANDMORETON8MADEABIARCCURVEBASEDONAQUADRATICEQUATIONATTHREEPOINTS,MEEKANDWALTON9USEDSPLINETYPESFORCONSTUCTIONOFBIARCCURVESCHONHERR10INTRODUCEDANAPPROACHTOMINIMIZETHERADIIOFBIARCCURVESCOMMONLYTHESEINTERPOLATIONMETHODSMAKETHEMACHININGPOINTSINCREASINGANDTHENTHEEXCESSIVEDATAFORMACHININGACURVEDSHAPEMAKETHEMACHININGERRORSINCREASEDTHUS,THEPRECISEMACHININGPROCESSREQUIRESMINIMIZATIONOFTHEMACHININGPOINTSTOKEEPTHEACCURACYUNDERAGIVENMACHININGTOLERANCETHISPAPERINTRODUCES3STEPSOFAHYBRIDCAD/CAMAHYBRIDAPPROACHFORCAMSHAPEDESIGNANDPROFILEMACHININGOFGENERALPLATECAMMECHANISMSJOONGHOSHIN1,SOONMANKWON1ANDHYOUNGCHULNAM1,1DEPARTMENTOFMECHANICALDESIGNMANUFACTURING,CHANGWONNATIONALUNIVERSITY,9,SARIMDONG,CHANGWON,KYUNGNAM,SOUTHKOREA,641773CORRESPONDINGAUTHOR/EMAILNHCHULCHANGWONACKR,TEL82552671106,FAX82552671106KEYWORDSPLATECAMMECHANISM,CAM,FOLLOWER,SHAPEDESIGN,PROFILEMACHINING,CONTACTPOINT,NCDATA,INSTANTVELOCITYCENTER,BIARCCURVEFITTINGPLATECAMMECHANISMCANEASILYPRODUCETHEPOSITIVEANDFUNCTIONALMOTIONSINCONTACTOFCAMANDFOLLOWERGENERALLYCAMMECHANISMISUSEDINMANYFIELDSOFMECHANICALCONTROL,AUTOMATION,ANDINDUSTRIALMACHINERYTOOBTAINTHEACCURATEMOTIONOFFOLLOWER,THEPROFILEOFCAMMUSTBEDESIGNEDANDMACHINEDPRECISELYTHISPAPERPROPOSESANINSTANTVELOCITYCENTERMETHODFORTHEPROFILEDESIGNANDABIARCFITTINGMETHODFORTHEPROFILEMACHININGTO4DIFFERENTTYPESOFPLATECAMMECHANISMSWITHRECIPROCATINGOROSCILLATINGMOTIONANDROLLERORFLATFACEDFOLLOWERSTHEKEYOFTHISPAPERISTHEINTRODUCTIONOFAHYBRIDSYSTEMCOMBINEDTHEDESIGNPROCEDURESANDTHEMANUFACTURINGPROCEDURESTHEMAINIDEAISTHATTHEMINIMUMMACHININGDATAAREBUILTBYTHEACCURATEBIARCCURVESFITTEDDIRECTLYFROMTHEDESIGNPARAMETERSTHERADIALDIRECTIONANGLESTOWARDBIARCCENTERSFORTHEACCURATEBIARCCURVEFITTINGCANBEDEFINEDDIRECTLYBYTHECONTACTANGLEOFCAMANDFOLLOWERGIVENINTHEDESIGNPROCEDURESANAPPLICATIONOFTHEPROPOSEDAPPROACHISVERIFIEDTHEACCURATEPROFILESOFADESIGNEDCAMANDAMACHININGCAMUSINGTHEMINIMUMNCDATAWITHINAGIVENMACHININGTOLERANCEMANUSCRIPTRECEIVEDJULY16,2009/ACCEPTEDFEBRUARY18,2010KSPEANDSPRINGER2010420/JUNE2010INTERNATIONALJOURNALOFPRECISIONENGINEERINGANDMANUFACTURINGVOL11,NO3APPROACH11FOR4DIFFERENTTYPESOFPLATECAMMECHANISMSFIRSTLY,THESHAPEOFCAMISDETERMINEDBYTHEKINEMATICCONSTRAINTSATINSTANTVELOCITYCENTERSANDTHECONTACTANGLEATTHECONTACTPOINTBETWEENCAMANDFOLLOWERTHESECONDSTEPISTOTRANSFORMTHECONTACTANGLESINTOTHECENTERDIRECTIONANGLESANDTHENTOCALCULATETHERADIIOFBIARCCURVEFINALLY,THEMACHININGDATAAREMINIMIZEDTHROUGHEXPANDINGORCONTRACTINGTHEBIARCSECTIONWHETHERTHECAMPROFILEPOINTSARELOCATEDINSIDEOROUTSIDETHERANGEOFAGIVENMACHININGTOLERANCE2CLARIFICATIONOFACCURACYONBIARCFITTING13ONLYTHEPROFILEDATAOFCAMSHAPEAREDEFINEDINCOMMONDESIGNPROCESSOFAPLATECAMTHEN,THEMACHININGDATAMUSTBEDEVELOPEDBYANYCURVEFITTINGFORNCNUMERICALCONTROLPROCESSTHECIRCULARFITTING,WHICHISMOSTWIDELYUSEDINMACHINING,HASUNRELIABILITYASSHOWNINFIG1ACIRCLEDEVELOPEDBYTHREEPOINTS1,P2,P3PHASARADIUS1RANDTHEOTHERBYPOINTS2,P3,P4PHAS2RINTHEVIEWSOFCIRCULARFITTINGTWOCIRCLESPASSTHEPROFILEPOINTS1,P2,P3,P4,PBUTTHEDISCONTINUOUSSLOPESAREMADEATTHESEPOINTSANDALSOTHEDISCONNECTIVERADIIATPOINTSINMIDSPANTHESEDEFECTSMAKETHEFITTEDCURVEINLOWACCURACYANDTHENHIGHERVIBRATIONINHIGHSPEEDOPERATIONOFCAMMECHANISMP4P3P2P1O2O1R1R2S1S2∆SSLOPE1SLOPE2FIG1DEFECTSONCIRCULARFITTINGΘ32Θ31R4R2P4P3O4O3S3S2R3S1P2O2O1P1R1Θ21Θ11Θ22Θ12FIG2CONTINUOUSFITTINGBYBIARCFIG2SHOWSACONTINUOUSCURVEFITTEDBYBIARCS,WHICHPASSESTHEPROFILEPOINTS1,P2,P3,P4PTHEBIARCCURVEHAS4RADIIINTHISCASERADIUS1RPASSES1PTO1,S2RFOR1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