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外文翻译网状工艺制造下循环型谐波传动柔性齿轮的发展.doc

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外文翻译网状工艺制造下循环型谐波传动柔性齿轮的发展.doc

大连交通大学2008届本科生毕业设计(论文)外文翻译DEVELOPMENTOFTHECOMPOSITEFLEXSPLINEFORACYCLOIDTYPEHARMONICDRIVEUSINGNETSHAPEMANUFACTURINGMETHODTHEFLEXSPLINEFORAHARMONICDRIVEMUSTBEFLEXIBLEINTHERADIALDIRECTIONFORTHEELASTICDEFORMATION,BUTMUSTBESTIFFINTHETORSIONALDIRECTIONFORACCURATETRANSMISSIONOFROTATIONALMOTIONSINCETHESEREQUIREMENTSCANNOTBESATISFIEDSIMULTANEOUSLYWITHCONVENTIONALMETALSSUCHASSTEELORALUMINIUM,INTHISWORKTHECARBONFIBEREPOXYCOMPOSITEMATERIALWASEMPLOYEDFORTHEFLEXSPLINEMATERIALINORDERTOINCREASETHETORSIONALSTIFFNESSBYTAILORINGTHESTACKINGSEQUENCEANDTOIMPROVETHEMANUFACTURINGPRODUCTIVITYBYMOULDINGRATHERTHANMACHININGTHETOOTHEDCOMPOSITEFLEXSPLINEWASMANUFACTUREDWITHTHEELASTOMERICCASCADETOOLINGTHATISCOMPOSEDOFTHESTEELTOOTHDIE,THESILICONRUBBERMANDRELANDTHECONESHAPEDSTEELCOREALSO,THESTEELFLEXSPLINEWITHTHESAMEDIMENSIONSOFTHECOMPOSITEFLEXSPLINEWASMANUFACTUREDBYCNCWIRECUTTINGMETHODTHESTATICANDDYNAMICPERFORMANCESOFTHECOMPOSITEFLEXSPLINEANDTHESTEELFLEXSPLINEWEREEXPERIMENTALLYTESTEDFROMTHETESTRESULTS,ITWASFOUNDTHATTHEDEVELOPEDCOMPOSITEFLEXSPLINEHADBETTERFLEXIBILITYINTHERADIALDIRECTIONANDHIGHDAMPINGCAPACITYATTHEFUNDAMENTALNATURALFREQUENCYINTRODUCTIONTHEHARMONICDRIVEISASPECIALGEARDRIVESPEEDREDUCTIONSYSTEMWHOSEOPERATIONPRINCIPLEISBASEDONTHEELASTICDEFORMATIONRATHERTHANTHERIGIDBODYMOTIONOFGENERALGEARINGSYSTEMITHASMANYADVANTAGES,SUCHASHIGHSPEEDREDUCTIONRATIO,HIGHROTATIONALACCURACY,HIGHTORQUETRANSFERPERWEIGHT,HIGHEFFICIENCY,LITTLEBACKLASHANDVERYCOMPACTSIZETHEREFORE,THEHARMONICDRIVEISWIDELYACCEPTEDININDUSTRIALROBOTSANDPRECISIONMECHANISMSTHETHREEBASICCOMPONENTSOFTHEHARMONICDRIVEARETHECIRCULARSPLINE,FLEXSPLINEANDELLIPTICALWAVEGENERATORASSHOWNINFIG1THECIRCULARSPLINEWHICHHASUSUALLYTWOORFOURMORETEETHTHANTHEFLEXSPLINEOPERATESINRIGIDBODYMOTIONTHEFLEXSPLINEISUSUALLYDESIGNEDASATHINWALLEDCUPTYPESHAPETHEFLEXSPLINEISCOMPOSEDOFTOOTH,TUBEANDBOSSSECTIONSASSHOWNINFIG2FIGURE3SHOWSTHEPRINCIPLEOFMOTIONOFTHEHARMONICDRIVEASTHEBALLBEARINGMOUNTEDONTHEELLIPTICALWAVEGENERATORDEFORMSTHEFLEXSPLINE大连交通大学2008届本科生毕业设计(论文)外文翻译ASSHOWNINFIG3,THETEETHOFTHEFLEXSPLINEONTHEMAJORAXISOFTHEELLIPTICALWAVEGENERATORENGAGETHETEETHOFTHECIRCULARSPLINEANDTHETEETHOFTHEFLEXSPLINEONTHEMINORAXISDISENGAGETHETEETHOFTHECIRCULARSPLINEIFTHERIGIDCIRCULARSPLINEISFIXED,THECLOCKWISEROTATINGOFTHEWAVEGENERATORPRODUCESTHECOUNTERCLOCKWISEROTATIONOFTHEFLEXSPLINEIFTHECIRCULARSPLINEHAS102TEETHANDTHEFLEXSPLINEHAS100TEETH,ASINGLECLOCKWISEREVOLUTIONOFTHEWAVEGENERATORMAKESTHEFLEXSPLINEROTATECOUNTERCLOCKWISETHROUGHANANGLECOMPARABLETOTWOTEETHINTHISCASE,THEROTATIONALVELOCITYRATIOIS501THEFLEXSPLINEOFTHEHARMONICDRIVETHATISTHEKEYELEMENTFORTHETORQUETRANSMISSIONHASTHECONTRADICTORYDUALROLETHATMUSTBEFLEXIBLEINTHERADIALDIRECTIONBUTMUSTBESTIFFINTHETORSIONALDIRECTIONTOACCURATELYTRANSMITROTATIONALMOTIONTHECONVENTIONALFLEXSPLINETHATISMADEOFISOTROPICMATERIALSSUCHASSTEELORALUMINIUMCANNOTSATISFYPERFECTLYTHECONTRADICTORYDUALROLEALSO,THEMOTIONOFTHEHARMONICDRIVEISNOTPERFECTLYSMOOTHBUTHASARIPPLEWHICHHASTHESAMEFREQUENCYASTHEWAVEGENERATOR4THERIPPLECANPRODUCENOISEANDVIBRATIONDURINGOPERATIONHOWEVER,IFTHEFLEXSPLINEISMANUFACTUREDUSINGTHECARBONFIBEREPOXYCOMPOSITEMATERIAL,MANYDRAWBACKSOFTHEHARMONICDRIVECANBEELIMINATED,BECAUSETHECARBONFIBEREPOXYCOMPOSITEMATERIALHASHIGHSPECIFICSTIFFNESS,HIGHSPECIFICSTRENGTHANDHIGHMATERIALDAMPINGCAPACITYTHEREFORE,INTHISWORK,THEFLEXSPLINEWASDESIGNEDANDMANUFACTUREDWITHTHEHIGHSTRENGTHCARBONFIBEREPOXYMATERIALTHETORSIONALSTIFFNESSWASINCREASEDWITHOUTINCREASINGTHERADIALSTIFFNESSBYTAILORINGTHESTACKINGSEQUENCEANDSELECTIONOFTHEFIBERORIENTATIONTHEINITIALSTUDYONTHEDEVELOPMENTOFTHECOMPOSITEFLEXSPLINEWITHCARBONFIBEREPOXYCOMPOSITEMATERIALSFORTHEHARMONICDRIVEWASCARRIEDOUTBYOH6ANDJEONG7THEYMANUFACTUREDTHECOMPOSITEFLEXSPLINEBYADHESIVELYJOININGTHESEPARATELYMANUFACTUREDPARTSSUCHASTHEBOSS,TUBEANDTOOTHSECTIONSSINCETHEPREVIOUSMANUFACTURINGMETHODSREQUIREDSEVERALLABORINTENSIVEOPERATIONS,INTHISWORK,ANEWNETSHAPEMANUFACTURINGMETHODFORTHECOMPOSITEFLEXSPLINEWASDEVELOPEDTOINCREASEMANUFACTURINGPRODUCTIVITYINTHISMETHOD,ALLTHESECTIONSOFTHEFLEXSPLINEWEREMADEWITHCARBONFIBEREPOXYCOMPOSITEMATERIALEXCEPTTHEBOSSSECTIONSINCETHEINVOLUTETOOTHPROFILETHATISUSEDINTHECONVENTIONALSTEELFLEXSPLINEHASASMALLCURVATUREATTHEDEDENDUM,THESTRESSCONCENTRATIONATTHEROOTOFTHETEETHISLARGEWHENTHEFLEXSPLINEISELLIPTICALLYDEFORMED,WHICHSHORTENSTHELIFEOFTHE大连交通大学2008届本科生毕业设计(论文)外文翻译FLEXSPLINE。HOWEVER,THECYCLOIDTOOTHPROFILEHASLESSSTRESSCONCENTRATIONATTHEROOTSECTIONOFTHETOOTHBECAUSETHECURVATUREISLARGERTHANTHEINVOLUTECURVETHEDISADVANTAGEOFTHECYCLOIDTOOTHISTHEDIFFICULTYOFMACHININGHOWEVER,IFTHETEETHAREMOLDED,THEMANUFACTURINGDIFFICULTYOFTHECYCLOIDANDINVOLUTETEETHWILLBETHESAMETHEREFORE,INTHISWORK,ANEPITROCHOIDTYPECYCLOIDCMVE,8WHICHWASUSUALLYEMPLOYEDFORTHETOOTHPROFILEOFTHECONVENTIONALCYCLOIDDRIVE,WASMODIFIEDANDADAPTEDFORTHECYCLOIDTYPEHARMONICDRIVETOIMPROVETHESTRENGTHOFTHEHARMONICDRIVEALSO,THENEWCIRCULARSPLINETHATWASMATEDWITHTHEEPITROCHOIDTYPECYCLOIDTEETHOFTHEFLEXSPLINEWASMANUFACTUREDWITHTHECARBONFIBERCOMPOSITEMATERIALANDSTEELPINSFORTHEMANUFACTURINGMETHODOFTHETOOTHEDFLEXSPLINE,ANELASTOMERICCASCADETOOLINGTHATISCOMPOSEDOFTHESTEELTOOTHDIE,THESILICONRUBBERDIEANDTHECONESHAPEDSTEELCOREWASUSEDTHETOOTHPROFILEOFTHESTEELDIEWASMANUFACTUREDBYACNCWIRECUTTINGMACHINEALSO,THESTEELFLEXSPLINEWITHTHESAMEDIMENSIONSOFTHECOMPOSITEFLEXSPLINEWASMADEBYCNCWIRECUTTINGMACHINETOCOMPARETHEPERFORMANCESFINALLYTHESTATICANDDYNAMICTESTSWEREPERFORMEDTOCOMPARETHEMECHANICALPROPERTIESOFTHEDEVELOPEDCOMPOSITEFLEXSPLINESDESIGNOFTHECYCLOIDTYPEHARMONICDRIVETHECYCLOIDDRIVEWHOSEOPERATIONALPRINCIPLEISSIMILARTOTHATOFTHEHARMONICDRIVEOPERATESINTHERIGIDBODYMOTIONTHECYCLOIDDRIVEISCOMPOSEDOFTHERIGIDINTERNALGEARWHICHHASMANYPINS,THERIGIDPLANETARYGEARWHICHHASTHEEPITROCHOIDTOOTHPROFILEANDTHEBALLBEARINGMOUNTEDONTHERIGIDRINGASSHOWNINFIG4THERIGIDRINGISUSUALLYASSEMBLEDINTHEECCENTRICINPUTSHAFTWHENTHEINTERNALGEARISFIXED,THEECCENTRICROTATIONOFTHERIGIDRINGAROUNDTHEINPUTSHAFTPRODUCESAMOTIONOFTHEPLANETARYGEARSINCETHEPINTYPETOOTHPROFILEISUSEDINTHEINTERNALGEARANDTHEEPITROCHOIDTOOTHPROFILEWHICHISMADEFROMSINUSOIDALFUNCTIONSISUSEDINTHEPLANETARYGEAROFTHECONVENTIONALCYCLOIDDRIVE,INTHISWORK,THEPINTYPETOOTHPROFILEWASUSEDINTHETOOTHPROFILEOFTHECIRCULARSPLINEANDTHEEPITROCHOIDTOOTHPROFILEWASUSEDINTHETOOTHPROFILEOFTHEFLEXSPLINETHEBEHAVIOROFTHEDESIGNEDTOOTHPROFILEWASCHECKEDTHROUGHTHECOMPUTERSIMULATIONTOAVOIDTHETOOTHINTERFERENCEDURINGMOTIONFIGURE5SHOWSTHECONFIGURATIONOFTHEDEVELOPEDCIRCULARSPLINEANDTHEFLEXSPLINEOFTHECYCLOIDTYPEHARMONICDRIVETABLE1SHOWSTHEDIMENSIONSOFTHEDEVELOPEDCYCLOIDTYPEHARMONICDRIVE大连交通大学2008届本科生毕业设计(论文)外文翻译FIGURE6SHOWSTHEASSEMBLEDCROSSSECTIONSOFTHECONVENTIONALINVOLUTETYPEHARMONICDRIVEANDTHEDEVELOPEDHARMONICDRIVEFIGURE7SHOWSACOMPUTERGRAPHICSIMULATIONOFTHEENGAGEMENTOFTHEINVOLUTEANDDEVELOPEDFLEXSPLINESFROMFIG7,ITWASFOUNDTHATTHEINTERFERENCEOFTHETOOTHOFTHEDEVELOPEDCYCLOIDTYPEFLEXSPLINEDIDNOTOCCURDURINGTHEFLEXSPLINETRANSLATIONNETSHAPEMANUFACTURINGOFTHEFLEXSPLINEINORDERTOMANUFACTURETHECOMPOSITEFLEXSPLINEWITHNETSHAPEMANUFACTURINGMETHOD,THEELASTOMERICCASCADETOOLINGWHICHISCOMPOSEDOFTHETOOTHDIE,THETUBEDIE,THESILICONRUBBERMANDREL,THESTEELCOREANDTHEVISES,WASUSEDINTHETHISWORKFIGURE8SHOWSTHEDIEASSEMBLYFORTHEMANUFACTURINGOFTHECOMPOSITEFLEXSPLINEINTHISMETHOD,THETEETHOFTHECOMPOSITEFLEXSPLINEWEREMOLDEDUSINGTHETOOTHDIEWHICHHASTHESHAPEOFTHEINTERNALGEARTHETEETHOFTHETOOTHDIEWEREMACHINEDBYACNCWIRECUTTINGMACHINETHETOOTHMACHININGWASCARRIEDOUTINTWOSTAGESSUCHASROUGHCUTTINGWITHO3MMDIAMETERWIREANDPRECISECUTTINGWITH01MMDIAMETERWIRETHETOOTHDIEASSHOWNINFIG9WASCOMPOSEDOFFOURPARTSTOMAKEDEMOLDINGOFTHECOMPOSITEFLEXSPLINEEASYBEFOREWIRECUTTINGTHETOOTHPROFILE,THERAWDIEMATERIALWASDIVIDEDINTOFOURPIECESAFTERGRINDINGTHEDIVIDEDSURFACES,THEFOURPARTSWEREASSEMBLEDANDTHETOOTHPROFILEWASCUTBYACNCWIRECUTTINGMACHINEFIGURE9ASHOWSTHETOOTHDIEBEFOREASSEMBLYANDFIG9BSHOWSTHEASSEMBLEDTOOTHDIEFORTHECONSOLIDATIONOFTHECOMPOSITEMATERIALDURINGCURE,THETAPEREDHOLLOWSILICONRUBBERMANDRELWASUSEDINORDERTOCOMPRESSTHESILICONMANDREL,THESTEELCOREWITH5”TAPERWASINSERTEDANDPUSHEDDOWNUSINGTHECLAMPINGNUTSANDBOLTSBYADJUSTINGTHECLAMPINGLENGTH,THEPRESSUREOFTHESILICONMANDRELWASCONTROLLEDTHETUBEDIEWHICHWASUSEDTOMANUFACTURETHETUBESECTIONOFTHETLEXSPLINEWASALSODIVIDEDINTOTWOPARTSTOMAKETHEDEMOLDINGOFTHEFLEXSPLINEEASYINORDERTORELIEVETHESTRESSCONCENTRATIONATTHEENDOFTHETOOTH,THEENDOFTHETUBEDIEWASTAPEREDAT45”THECOMPOSITEFLEXSPLINEWASMANUFACTUREDBYTHEFOLLOWINGPROCESSESTHECARBONFIBEREPOXYPREPREGWASWRAPPEDONTHESILICONMANDRELTHEPARTOFTHEPREPREGTOWHICHTHEBOSSOFTHEFLEXSPLINEASSHOWNINFIG2WASJOINEDBYCOCUREWASHEATEDALITTLETOMAKETHEPREPREGFLEXIBLEANDWASJOINEDTOTHEBOSSPARTTHEN,THETUBESECTIONOFTHESILICONMANDRELWRAPPEDWITHPREPREGWASCOVEREDBYTHETUBE

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