




已閱讀5頁,還剩5頁未讀, 繼續(xù)免費閱讀
版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進行舉報或認領(lǐng)
文檔簡介
大連交通大學2008屆本科生畢業(yè)設計(論文)外文翻譯Developmentofthecompositeflexsplineforacycloid-typeharmonicdriveusingnetshapemanufacturingmethodTheflexsplineforaharmonicdrivemustbeflexibleintheradialdirectionfortheelasticdeformation,butmustbestiffinthetorsionaldirectionforaccuratetransmissionofrotationalmotion.Sincetheserequirementscannotbesatisfiedsimultaneouslywithconventionalmetalssuchassteeloraluminium,inthisworkthecarbonfiberepoxycompositematerialwasemployedfortheflexsplinematerialinordertoincreasethetorsionalstiffnessbytailoringthestackingsequenceandtoimprovethemanufacturingproductivitybymouldingratherthanmachining.Thetoothedcompositeflexsplinewasmanufacturedwiththeelastomericcascadetoolingthatiscomposedofthesteeltoothdie,thesiliconrubbermandrelandthecone-shapedsteelcore.Also,thesteelflexsplinewiththesamedimensionsofthecompositeflexsplinewasmanufacturedbyCNCwirecuttingmethod.Thestaticanddynamicperformancesofthecompositeflexsplineandthesteelflexsplinewereexperimentallytested.Fromthetestresults,itwasfoundthatthedevelopedcompositeflexsplinehadbetterflexibilityintheradialdirectionandhighdampingcapacityatthefundamentalnaturalfrequency.INTRODUCTIONTheharmonicdriveisaspecialgear-drivespeedreductionsystemwhoseoperationprincipleisbasedontheelasticdeformationratherthantherigidbodymotionofgeneralgearingsystem.Ithasmanyadvantages,suchashighspeedreductionratio,highrotationalaccuracy,hightorquetransferperweight,highefficiency,littlebacklashandverycompactsize.Therefore,theharmonicdriveiswidelyacceptedinindustrialrobotsandprecisionmechanisms.Thethreebasiccomponentsoftheharmonicdrivearethecircularspline,flexsplineandellipticalwavegeneratorasshowninFig.1.Thecircularsplinewhichhasusuallytwoorfourmoreteeththantheflexsplineoperatesinrigidbodymotion.Theflexsplineisusuallydesignedasathinwalledcup-typeshape.Theflexsplineiscomposedoftooth,tubeandbosssectionsasshowninFig.2.Figure3showstheprincipleofmotionoftheharmonicdrive.Astheball-bearingmountedontheellipticalwavegeneratordeformstheflexspline大連交通大學2008屆本科生畢業(yè)設計(論文)外文翻譯asshowninFig.3,theteethoftheflexsplineonthemajoraxisoftheellipticalwavegeneratorengagetheteethofthecircularsplineandtheteethoftheflexsplineontheminoraxisdisengagetheteethofthecircularspline.Iftherigidcircularsplineisfixed,theclockwiserotatingofthewavegeneratorproducesthecounterclockwiserotationoftheflexspline.Ifthecircularsplinehas102teethandtheflexsplinehas100teeth,asingleclockwiserevolutionofthewavegeneratormakestheflexsplinerotatecounterclockwisethroughananglecomparabletotwoteeth.Inthiscase,therotationalvelocityratiois50:1.Theflexsplineoftheharmonicdrivethatisthekeyelementforthetorquetransmissionhasthecontradictorydualrolethatmustbeflexibleintheradialdirectionbutmustbestiffinthetorsionaldirectiontoaccuratelytransmitrotationalmotion.Theconventionalflexsplinethatismadeofisotropicmaterialssuchassteeloraluminiumcannotsatisfyperfectlythecontradictorydualrole.Also,themotionoftheharmonicdriveisnotperfectlysmoothbuthasaripplewhichhasthesamefrequencyasthewavegenerator.4Theripplecanproducenoiseandvibrationduringoperation.However,iftheflexsplineismanufacturedusingthecarbonfiberepoxycompositematerial,manydrawbacksoftheharmonicdrivecanbeeliminated,becausethecarbonfiberepoxycompositematerialhashighspecificstiffness,highspecificstrengthandhighmaterialdampingcapacity.Therefore,inthiswork,theflexsplinewasdesignedandmanufacturedwiththehighstrengthcarbonfiberepoxymaterial.Thetorsionalstiffnesswasincreasedwithoutincreasingtheradialstiffnessbytailoringthestackingsequenceandselectionofthefiberorientation.TheinitialstudyonthedevelopmentofthecompositeflexsplinewithcarbonfiberepoxycompositematerialsfortheharmonicdrivewascarriedoutbyOh6andJeong.7Theymanufacturedthecompositeflexsplinebyadhesivelyjoiningtheseparatelymanufacturedpartssuchastheboss,tubeandtoothsections.Sincethepreviousmanufacturingmethodsrequiredseverallaborintensiveoperations,inthiswork,anewnetshapemanufacturingmethodforthecompositeflexsplinewasdevelopedtoincreasemanufacturingproductivity.Inthismethod,allthesectionsoftheflexsplineweremadewithcarbonfiberepoxycompositematerialexceptthebosssection.Sincetheinvolutetoothprofilethatisusedintheconventionalsteelflexsplinehasasmallcurvatureatthededendum,thestressconcentrationattherootoftheteethislargewhentheflexsplineisellipticallydeformed,whichshortensthelifeofthe大連交通大學2008屆本科生畢業(yè)設計(論文)外文翻譯flexspline.。However,thecycloidtoothprofilehaslessstressconcentrationattherootsectionofthetoothbecausethecurvatureislargerthantheinvolutecurve.Thedisadvantageofthecycloidtoothisthedifficultyofmachining.However,iftheteetharemolded,themanufacturingdifficultyofthecycloidandinvoluteteethwillbethesame.Therefore,inthiswork,anepitrochoidtypecycloidcm-ve,8whichwasusuallyemployedforthetoothprofileoftheconventionalcycloiddrive,wasmodifiedandadaptedforthecycloidtypeharmonicdrivetoimprovethestrengthoftheharmonicdrive.Also,thenewcircularsplinethatwasmatedwiththeepitrochoidtypecycloidteethoftheflexsplinewasmanufacturedwiththecarbonfibercompositematerialandsteelpins.Forthemanufacturingmethodofthetoothedflexspline,anelastomericcascadetoolingthatiscomposedofthesteeltoothdie,thesiliconrubberdieandthecone-shapedsteelcorewasused.ThetoothprofileofthesteeldiewasmanufacturedbyaCNCwirecuttingmachine.Also,thesteelflexsplinewiththesamedimensionsofthecompositeflexsplinewasmadebyCNCwirecuttingmachinetocomparetheperformances.Finallythestaticanddynamictestswereperformedtocomparethemechanicalpropertiesofthedevelopedcompositeflexsplines.DESIGNOFTHECYCLOID-TYPEHARMONICDRIVEThecycloiddrivewhoseoperationalprincipleissimilartothatoftheharmonicdriveoperatesintherigidbodymotion.Thecycloiddriveiscomposedoftherigidinternalgearwhichhasmanypins,therigidplanetarygearwhichhastheepitrochoidtoothprofileandtheballbearingmountedontherigidringasshowninFig.4.Therigidringisusuallyassembledintheeccentricinputshaft.Whentheinternalgearisfixed,theeccentricrotationoftherigidringaroundtheinputshaftproducesamotionoftheplanetarygear.Sincethepin-typetoothprofileisusedintheinternalgearandtheepitrochoidtoothprofilewhichismadefromsinusoidalfunctionsisusedintheplanetarygearoftheconventionalcycloiddrive,inthiswork,thepin-typetoothprofilewasusedinthetoothprofileofthecircularsplineandtheepitrochoidtoothprofilewasusedinthetoothprofileoftheflexspline.Thebehaviorofthedesignedtoothprofilewascheckedthroughthecomputersimulationtoavoidthetoothinterferenceduringmotion.Figure5showstheconfigurationofthedevelopedcircularsplineandtheflexsplineofthecycloid-typeharmonicdrive.Table1showsthedimensionsofthedevelopedcycloid-typeharmonicdrive.大連交通大學2008屆本科生畢業(yè)設計(論文)外文翻譯Figure6showstheassembledcrosssectionsoftheconventionalinvolutetypeharmonicdriveandthedevelopedharmonicdrive.Figure7showsacomputergraphicsimulationoftheengagementoftheinvoluteanddevelopedflexsplines.FromFig.7,itwasfoundthattheinterferenceofthetoothofthedevelopedcycloid-typeflexsplinedidnotoccurduringtheflexsplinetranslation.NETSHAPEMANUFACTURINGOFTHEFLEXSPLINEInordertomanufacturethecompositeflexsplinewithnetshapemanufacturingmethod,theelastomericcascadetoolingwhichiscomposedofthetoothdie,thetubedie,thesiliconrubbermandrel,thesteelcoreandthevises,wasusedinthethiswork.Figure8showsthedieassemblyforthemanufacturingofthecompositeflexspline.Inthismethod,theteethofthecompositeflexsplineweremoldedusingthetoothdiewhichhastheshapeoftheinternalgear.TheteethofthetoothdieweremachinedbyaCNCwirecuttingmachine.ThetoothmachiningwascarriedoutintwostagessuchasroughcuttingwithO-3mmdiameterwireandprecisecuttingwith0.1mmdiameterwire.ThetoothdieasshowninFig.9wascomposedoffourpartstomakedemoldingofthecompositeflexsplineeasy.Beforewire-cuttingthetoothprofile,therawdiematerialwasdividedintofourpieces.Aftergrindingthedividedsurfaces,thefourpartswereassembledandthetoothprofilewascutbyaCNCwirecuttingmachine.Figure9(a)showsthetoothdiebeforeassemblyandFig.9
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會有圖紙預覽,若沒有圖紙預覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫網(wǎng)僅提供信息存儲空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負責。
- 6. 下載文件中如有侵權(quán)或不適當內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準確性、安全性和完整性, 同時也不承擔用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- 護理導管安全管理體系
- 醫(yī)護人員職業(yè)素質(zhì)課件
- 企業(yè)內(nèi)部買車位協(xié)議書
- 集體土地聯(lián)營協(xié)議書
- 餐廳責任經(jīng)營協(xié)議書
- 車間物品保管協(xié)議書
- 門樓制作合同協(xié)議書
- 高空吊機轉(zhuǎn)讓協(xié)議書
- 鄰居違約建房協(xié)議書
- 貸款簽訂產(chǎn)權(quán)協(xié)議書
- 多彩的非洲文化 - 人教版課件
- 2025年年中考物理綜合復習(壓軸特訓100題55大考點)(原卷版+解析)
- -《經(jīng)濟法學》1234形考任務答案-國開2024年秋
- TCGIA0012017石墨烯材料的術(shù)語定義及代號
- 2025年江蘇省南通市海門市海門中學高三最后一卷生物試卷含解析
- 鋼結(jié)構(gòu)與焊接作業(yè)指導書
- 吉林省長春市2025屆高三下學期4月三模試題 英語 含解析
- 醫(yī)院退休返聘協(xié)議書10篇
- 第五單元:含長方形和正方形的不規(guī)則或組合圖形的面積專項練習-2023-2024學年三年級數(shù)學下冊典型例題系列(解析版)人教版
- 殘疾人健康管理
- 崗位就業(yè)協(xié)議書范本
評論
0/150
提交評論