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外文翻译--设计并联机床使用kinetostatic标准的表现.doc

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外文翻译--设计并联机床使用kinetostatic标准的表现.doc

机040511号马吟川指导老师许宝杰1THEDESIGNOFPARALLELKINEMATICMACHINETOOLSUSINGKINETOSTATICPERFORMANCECRITERIAHTTP//ARXIVORG/FTP/ARXIV/PAPERS/0705/07051038PDF1INTRODUCTIONMOSTINDUSTRIALMACHINETOOLSHAVEASERIALKINEMATICARCHITECTURE,WHICHMEANSTHATEACHAXISHASTOCARRYTHEFOLLOWINGONE,INCLUDINGITSACTUATORSANDJOINTSHIGHSPEEDMACHININGHIGHLIGHTSSOMEDRAWBACKSOFSUCHARCHITECTURESHEAVYMOVINGPARTSREQUIREFROMTHEMACHINESTRUCTUREHIGHSTIFFNESSTOLIMITBENDINGPROBLEMSTHATLOWERTHEMACHINEACCURACY,ANDLIMITTHEDYNAMICPERFORMANCESOFTHEFEEDAXESTHATISWHYPKMSATTRACTMOREANDMORERESEARCHERSANDCOMPANIES,BECAUSETHEYARECLAIMEDTOOFFERSEVERALADVANTAGESOVERTHEIRSERIALCOUNTERPARTS,LIKEHIGHSTRUCTURALRIGIDITYANDHIGHDYNAMICCAPACITIESINDEED,THEPARALLELKINEMATICARRANGEMENTOFTHELINKSPROVIDESHIGHERSTIFFNESSANDLOWERMOVINGMASSESTHATREDUCEINERTIAEFFECTSTHUS,PKMSHAVEBETTERDYNAMICPERFORMANCESHOWEVER,THEDESIGNOFAPARALLELKINEMATICMACHINETOOLPKMTISAHARDTASKTHATREQUIRESFURTHERRESEARCHSTUDIESBEFOREWIDEINDUSTRIALUSECANBEEXPECTEDMANYCRITERIANEEDTOBETAKENINTOACCOUNTINTHEDESIGNOFAPKMTWEPAYSPECIALATTENTIONTOTHEDESCRIPTIONOFKINETOSTATICCRITERIATHATRELYONTHECONDITIONINGOFTHEJACOBIANMATRIXOFTHEMECHANISMTHEORGANISATIONOFTHISPAPERISASFOLLOWSNEXTSECTIONINTRODUCESGENERALREMARKSABOUTPKMS,THENISEXPLAINEDWHYPKMSCANBEINTERESTINGALTERNATIVEMACHINETOOLDESIGNSTHENAREPRESENTEDEXISTINGPKMTSANAPPLICATIONTOTHEDESIGNOFASMALLSCALEMACHINETOOLPROTOTYPEDEVELOPEDATIRCCYNISPRESENTEDATTHEENDOFTHISPAPER2ABOUTPARALLELKINEMATICMACHINES21GENERALREMARKSTHEFIRSTINDUSTRIALAPPLICATIONOFPKMSWASTHEGOUGHPLATFORMFIGURE1,DESIGNEDIN1957TOTESTTYRES1PKMSHAVETHENBEENUSEDFORMANYYEARSINFLIGHTSIMULATORSANDROBOTICAPPLICATIONS2BECAUSEOFTHEIRLOWMOVINGMASSANDHIGHDYNAMICPERFORMANCESSINCETHEDEVELOPMENTOFHIGHSPEEDMACHINING,PKMTSHAVEBECOMEINTERESTINGALTERNATIVEMACHINETOOLDESIGNS3,4机040511号马吟川指导老师许宝杰2FIGURE1THEGOUGHPLATFORMINAPKM,THETOOLISCONNECTEDTOTHEBASETHROUGHSEVERALKINEMATICCHAINSORLEGSTHATAREMOUNTEDINPARALLELTHELEGSAREGENERALLYMADEOFEITHERTELESCOPICSTRUTSWITHFIXEDNODEPOINTSFIGURE2A,ORFIXEDLENGTHSTRUTSWITHGLIDINGNODEPOINTSFIGURE2BALONGWITHHIGHSPEEDCUTTINGSUNCEASINGDEVELOPMENT,THETRADITIONALTANDEMTYPEORGANIZATIONCONSTRUCTSTHEPLATFORMTHESTRUCTURERIGIDITYANDTHETRAVELINGCARRIAGEHIGHSPEEDBECOMESTHETECHNOLOGICALDEVELOPMENTGRADUALLYTHEBOTTLENECK,BUTTHEPARALLELPLATFORMTHENBECOMESTHEBESTCANDIDATEOBJECT,BUTWASOPPOSITEINTHETANDEMENGINEBED,THEPARALLELWORKINGPLATFORMHADTHEFOLLOWINGCHARACTERISTICANDTHEMERIT1STRUCTUREISSIMPLE,THEPRICEISLOWTHEENGINEBEDMECHANICALSPAREPARTNUMBERISSERIESCONNECTEDCONSTRUCTSTHEPLATFORMTOREDUCELARGELY,MAINLYBYTHEBALLBEARINGGUIDESCREW,THEHOOKEARTICULATION,THEBALLARTICULATION,THESERVOELECTRICALMACHINERYANDSOONCOMMONMODULEISCOMPOSED,THESECOMMONMODULESMAYBYTHESPECIALFACTORYPRODUCTION,THUSTHISENGINEBEDSMANUFACTUREANDTHEINVENTORYCOSTAREMUCHLOWERTHANTHESAMEFUNCTIONSTRADITIONALENGINEBED,EASYTOASSEMBLEANDTHETRANSPORTING2STRUCTURERIGIDITYISHIGHBECAUSEUSEDCLOSENESSSTRUCTURECLOSEDLOOPSTRUCTURETOENABLEITTOHAVEHIGHRIGIDANDTHEHIGHSPEEDMERIT,ITSSTRUCTURALLOADSTREAMLINEWASSHORT,BUTSHOULDEREDDECOMPOSESPULLS,THEPRESSUREALSOTOWITHSTANDBYSIXCONNECTINGRODS,BYMATERIALSMECHANICSVIEWPOINT,WHENTHEEXTERNALFORCEWASCERTAIN,THEBRACKETQUANTITYSSTRESSANDTHEDISTORTIONWEREBIGGEST,THEBOTHSIDESINSERTEDTHEBUILDINNEXTBEST,CAMEISAGAINBOTHSIDESJANSUPPORTSSIMPLYSUPPORTED,NEXTWASTHEBEARINGTWOSTRENGTHSTRUCTURE,WHATTHESTRESSANDTHEDISTORTIONWERESMALLESTWASTHETENSITYTWOSTRENGTHSTRUCTURE,THEREFOREITHADTHEHIGHRIGIDITYITSRIGIDITYLOADRATIOISHIGHERTHANTRADITIONALTHENUMERICALLYCONTROLLEDMACHINETOOL3PROCESSINGSPEEDISHIGH,THEINERTIAISLOWIFTHESTRUCTUREWITHSTANDSTHESTRENGTHWILLCHANGETHEDIRECTION,WILLBESITUATEDBETWEENTENSITYANDPRESSURE,TWOSTRENGTHCOMPONENTSWILLBEMOSTSAVETHEMATERIALTHESTRUCTURE,BUTITWILLMOVETOTHEMOVINGPARTSWEIGHTTOREDUCETOLOWLYANDSIMULTANEOUSLYWILLACTUATEBYSIXACTUATINGUNITS,THEREFOREMACHINEVERYEASYHIGHSPEED,ANDWILLHAVETHELOWINERTIA4WORKINGACCURACYISHIGHBECAUSEITFORTHEMULTIPLESPINDLEPARALLELORGANIZATIONCOMPOSITION,SIXEXPANDABLEPOLEPOLESLONGALONEHASANEFFECTTOCUTTINGTOOLSPOSITIONANDTHEPOSTURE,THUS机040511号马吟川指导老师许宝杰3DOESNOTHAVETHETRADITIONALENGINEBEDIECONNECTSENGINEBEDTHEGEOMETRICALERRORACCUMULATIONANDTHEENLARGEMENTPHENOMENON,EVENALSOHASTHEBEINGUNIFORMEFFECTAVERAGINGEFFECT;ITHASTHEHOTSYMMETRICALSTRUCTURALDESIGN,THEREFORETHETHERMALDEFORMATIONISSMALL;THEREFOREITHASTHEHIGHACCURACYMERIT5MULTIPURPOSEFLEXIBLEISCONVENIENTASARESULTOFTHISENGINEBEDORGANIZATIONSIMPLECONTROL,EASILYACCORDINGTOPROCESSINGOBJECT,BUTDESIGNSITTHESPECIALPURPOSEMACHINE,SIMULTANEOUSLYMAYALSODEVELOPTHEGENERALENGINEBED,WITHREALIZESTHEMILLING,BORING,PROCESSINGSANDSOONGRINDING,BUTMAYALSOPROVIDETHEESSENTIALMEASURINGTOOLTOCOMPOSEITTHEMEASURINGENGINE,REALIZESENGINEBEDSMULTIPURPOSETHISWILLBRINGTHEVERYBIGAPPLICATIONANDTHEMARKETPROSPECT,HASTHEVERYBROADAPPLICATIONPROSPECTINTHENATIONALDEFENSEANDTHECIVILASPECT6SERVICELIFEISLONGBECAUSETHESTRESSSTRUCTUREISREASONABLE,THEMOVINGPARTATTRITIONISSMALL,ANDDOESNOTHAVETHEGUIDERAIL,DOESNOTHAVETHEIRONFILINGSEITHERTHEREFRIGERANTENTERSTHEGUIDERAILINTERIORTOCAUSEITTOSCRATCH,THEATTR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