已阅读5页,还剩5页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
大连交通大学2008届本科生毕业设计(论文)外文翻译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大连交通大学2008届本科生毕业设计(论文)外文翻译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大连交通大学2008届本科生毕业设计(论文)外文翻译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.大连交通大学2008届本科生毕业设计(论文)外文翻译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
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 一年级上册美术教案-第11-15课-湘美版
- 广西北海市2024年七年级生物第二学期期中质量检测试卷附答案
- 广东省东莞市虎门外语校2024年中考猜题数学试卷含解析
- 2023年改性塑料企业商业风险管理
- 2023年浙江省生态环境厅所属事业单位招聘考试真题及答案
- 2023年青岛市委党校招聘考试真题及答案
- 2023年国家能源集团航运有限公司系统内招聘考试真题及答案
- 福建省三明市A片区高中联盟校2024年高三下学期联合考试数学试题含解析
- 大学生期末总结(13篇)
- 广东东莞智升校2024年中考英语最后冲刺卷含答案
- 产品外观通用检验方法及标准
- 中电建协第三届电力监理专委会取费标准
- 人教版二年级数学下册第五单元混合运算看图列式计算和应用题
- 以阿米巴经营模式促进加油站管理转型的探究
- 中餐宴会摆台实训教学设计
- 二年级数学下册总复习计算题(10套)专项强化练习
- 嗜卷书虱的生物学特性及其防治
- SiC基SBD器件实验用光刻版
- 实验室用水检测记录表
- 中国服务业产业内贸易分析
- 金属栏杆施工方案(完整版)
评论
0/150
提交评论