现代数控机床原理与结构PPT资料.ppt
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现代数控机床原理与结构PPT资料.ppt
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书名:
@#@现代数控机床原理与结构(双语)ISBN:
@#@978-7-111-42403-1作者:
@#@郁元正出版社:
@#@机械工业出版社本书配有电子课件现代数控机床原理与结构(双语)ppt课件Chapter2Motions&@#@coordinatesystemofMachinetools2.1Motionsofmachinetool2.2Machinetooldrive2.3Coordinatesystems现代数控机床原理与结构(双语)ppt课件2.1Motionsofmachinetool2.1.1PurposeofmotionsThepurposeofmachinetoolmotionsistoremovematerialsfromworkpiecestoobtainrequiredshapes,dimensionsandsurfacequality.Motionessentialsaretoolmotions,workpiecemotions,andcuttingmotions.2.1.2SurfaceformingmotionSurfaceformingmotionistherelativecuttingmotionbetweentoolandworkpiece.Typesandquantityofsurfaceformingmotiondetermineshapeofworkpiece,machiningmethodandtoolconstructions现代数控机床原理与结构(双语)ppt课件OutercircularsurfaceturningSurfaceformingmotionconsistsof:
@#@PrimarymotionFeedingmotion现代数控机床原理与结构(双语)ppt课件1)PrimarymotionPrimarymotioncausesrelativemotionbetweencuttingtoolandworkpiece,andremovematerialfromworkpiece.Examplesofprimarymotions:
@#@Rotarymotionofworkpiece(turning)Rotarymotionofcuttingtools(drilling,milling,boring)Reciprocatingmotionofcuttingtools(broaching,planing)Everymachiningprocessmusthave,andonlyhasaprimarymotion.现代数控机床原理与结构(双语)ppt课件2)FeedingmotionFeedingmotioncausesansecondaryrelativemotionbetweencuttingtoolandworkpiece,andenablestoolcancontinuouslyremovematerialfromworkpiecetoformadesiredshape.ExamplesoffeedingmotionAxialandradialmotionsofcuttingtool(turning)Stepmotionsofcuttingtoolorworkpiece(planing)Note:
@#@Feedingmotioncanbeperformedbybothcuttingtoolsorworkpieces;@#@Twoormorefeedingmotionscanco-exist(gearhobbing);@#@Zerofeedingmotionispossible(broaching).现代数控机床原理与结构(双语)ppt课件ThinkingIdentifyprimarymotionsandfeedingmotions.PlaningBroachingMilling现代数控机床原理与结构(双语)ppt课件2.1.3AssistantmotionsAllmotionsotherthansurfaceformingmotions,includingplungemotion,indexingmotion,alignmentmotion,fastmoving,andotheractions.1)PlungemotionPlungecuttingtoolintoworkpiecetoobtainacertaindimension2)IndexingmotionPeriodicalmoving,rotatingofworktableortoolposttomachiningeachsurfacesofworkpiece,e.g.multi-threadscrewsturning,polygonmachining,etc.现代数控机床原理与结构(双语)ppt课件3)AlignmentmotionItisusedtoobtaincorrectrelativepositionsbetweencuttingtoolandworkpiece,e.g.aligningdrilltoholecenterbymovingrockerarmofthedriller.4)FastmovingandotheractionsFastmovingimprovesmachiningefficiency.Otheractionsincludedirectionchange,clamping,releasing,etc.现代数控机床原理与结构(双语)ppt课件2.2MachinetooldriveTorealizethosenecessarymotionsformachining,eachNCmachinetoolshouldhavethreebasicunits:
@#@
(1)Actuators,e.g.spindle,toolpost,worktable,etc.Theydirectperformmachining
(2)Drivesystem,e.g.AC/DCmotors,stepmotors,etc.Theyproducemechanicalmotionforactuators.(3)Transmissions.Theytransfermotionandpowerfromdrivesystemtoactuators.Transmissionscanbeinmechanical,electric,hydraulicandpneumatic现代数控机床原理与结构(双语)ppt课件2.2.1TransmissionconnectionConnectionbetweenactuatorandpowerorbetweenactuatorsbytransmissioncomponents.TransmissiondiagramofCA6140horizontallathe2.2.2TransmissionchainAseriesoftransmissioncomponentsthatconsistatransmissionconnectionisknownastransmissionchain.Twoformsoftransmission
(1)Constantratioanddirection.
(2)Variableanddirection.Gears,wormgears-shaft,ballscrew-nutAdjustinggears,clashgears,clutchgearshiftTransmissionchainsincludeexternalandinternalrelations:
@#@1)ExternalrelationConnectingpowerunitandactuatorsDrivingactuatorsrunningatdesignedspeedDeterminingmachiningefficiencyandsurfaceroughnessratherthanshapeofworkpiece.2)InternalrelationConnectingandregulatingmotionsbetweenactuators;@#@Precisetransmissionratioisimportant.Frictionaltransmission(e.g.clutch)orinstantaneousvariableratio(chaindrive)isunacceptable;@#@Screwturningrequiresstringenttransmissionratiobetweenspindlerotationandtoolpostmovingtoensureprecisethreadpitch.2.2.3TransmissiondiagramTransmissiondiagrambrieflyrepresentsrelativemotionpathsofsurfaceforming.SymbolsfortransmissiondiagramCuttingtoolSpindleMotorCombinedunitConstantratioHob(滚刀)VariableratioTransmissiondiagramofscrewturningGearratio1(externalrelation)Gearratio2(internalrelation)MotorThreadCuttingtoolLeadscrewSpindleFromNCmachinetools,spindleandtoolpostmaybedrivenbytheirownmotors.2.2.4Transmissionsystemdiagram:
@#@XKA5750millingmachineCartesiancoordinate(Righthandrules)Descartes(1596-1690)Frenchphilosopher,mathematician2.3.1Standardcoordinatesystemanddirection1.ISOcoordinatesystem2.3CoordinatesystemforNCmachinetools2.Directionsofaxes
(1)Allaxesassumethattoolsmovewhileworktablesrest;@#@Whenworktablemoves,itmovesalonganaxismarkedwith“;@#@Notes:
@#@Worktablemotiononlybeconsideredduringmachinetooldesignstage.
(2)Positivedirection-The
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- 现代 数控机床 原理 结构