现代数控机床原理与结构PPT资料.ppt

现代数控机床原理与结构PPT资料.ppt

《现代数控机床原理与结构PPT资料.ppt》由会员分享，可在线阅读，更多相关《现代数控机床原理与结构PPT资料.ppt（29页珍藏版）》请在冰豆网上搜索。

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