主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege1.ContentsandDrawingMethodofAssemblyDrawingsIntroductionAnassemblydrawingisadiagramthatexpressestheworkingprinciple,structuralperformance,andtheassemblyandconnectionrelationshipsofvariouspartswithinamachine(orcomponent).Duringproductdesign,theassemblydrawingisfirstcreatedaccordingtothedesignintent,andthenthepartdrawingsaremade.Inproductmanufacturing,partsarefirstprocessedbasedonthepartdrawingsandthenassembledintocomponentsormachinesaccordingtotheassemblydrawing.Theassemblydrawingservesasthebasisforpartdesign,theformulationofassemblyprocessregulations,aswellasanessentialdocumentforassembly,debugging,inspection,andmaintenance.Itisanimportanttechnicaldocumentforexpressingdesignideasandguidingproduction.IntroductionMainContentContentoftheAssemblyDrawingDrawingMethodoftheAssemblyDrawingMainContentPartIContentoftheAssemblyDrawingPARTIContentoftheAssemblyDrawing(1)AsetofviewsAsetofviewsisusedtorepresenttheworkingprincipleofthemachineorcomponent,therelativepositionsofeachpart,theassemblyrelationship,thestructureofimportantparts,andthetransmissionpath,etc.Differentmethodssuchasviews,sectionviews,detailedviews,andenlargedpartialviewscanbeusedtoexpressthese.ContentoftheAssemblyDrawing(2)NecessarydimensionsTheassemblydrawingshouldincludethespecifications(performance)dimensionsofthemachineorcomponent,fitdimensions,installationdimensions,externaldimensions,andanyotherimportantdimensionsdeterminedduringthedesignprocess.(3)TechnicalrequirementsTechnicalrequirementsaredescribedusingtextorsymbolstospecifyconditionsorrequirementsrelatedtotheassembly,installation,inspection,oroperationofthemachineorcomponent.(4)PartnumbersanditemizedlistEachdifferentpart(orcomponent)shouldbeassignedapartnumber,andanitemizedlistshouldbecreatedabovethetitleblock.Thelistshouldincludethepartnumber,name,quantity,material,andotherrelevantdetails.(5)TitleblockThetitleblockcontainsthefollowinginformation:thenameofthemachineorcomponent,scale,drawingnumber,andsignaturesofthedesigner,drafter,andreviewer,alongwiththedate.PartIIDrawingMethodsofAssemblyDrawingsPARTIIDrawingMethodsofAssemblyDrawingsPrescribedDrawingMethodsforAssemblyDrawingsSimplifiedDrawingMethodsforAssemblyDrawingsDrawingMethodsofAssemblyDrawingsSpecialDrawingMethodsforAssemblyDrawingsDrawingMethodsofAssemblyDrawings

ContactSurface,MatingSurfaceDrawonlyoneline.Non-contactSurfaceDrawtwothicksolidlines.PrescribedDrawingMethodsforAssemblyDrawingsForthecontactsurfacesandmatingsurfacesoftwoparts,drawonlyonethicksolidline.Fornon-contactsurfacesandnon-matingsurfaces,drawtwothicksolidlines.Ifthegapisverysmall,exaggerationindrawingcanbeapplied.DrawingMethodsofAssemblyDrawingsSectionlines:oppositedirectionsSectionlines:differentintervalsPrescribedDrawingMethodsforAssemblyDrawingsThesectionlinesoftwoadjacentpartsmusthaveoppositedirectionsordifferentintervals;thesectionlinesofthesamepartindifferentviewsmusthavethesamedirectionandthesameinterval.DrawingMethodsofAssemblyDrawingsDrawnWithoutSectioningPrescribedDrawingMethodsforAssemblyDrawingsWhenthecuttingplanepassesthroughtheaxisofsolidcomponentssuchasfasteners,balls,handles,andkeys,thesepartsaredrawnwithoutsectioning.DrawingMethodsofAssemblyDrawingsSpecialDrawingMethodsTorepresenttheassemblysituationofpartsthatareblockedbyothercomponentsinsidetheassembly,itispossibletoimagineacutalongthematingsurfacesofcertainpartsortodrawthepartsaftertheyaredisassembled.Ifneeded,thenote"RemoveXX"canbeadded.Inthiscase,donotdrawsectionlinesonthematingsurfacesoftheparts.DrawingMethodsofAssemblyDrawingsPhantomDrawingMethodAdjacentpartsorcomponentsthatdonotbelongtothiscomponentbutarerelatedtoitThePhantomDrawingMethodisrepresentedusingadashedline.TheextremepositionsofpartmovementDrawingMethodsofAssemblyDrawingsExaggeratedDrawingMethodInassemblydrawings,whenverysmallgaps,thinparts,finesprings,etc.,cannotbeshownatactualsize,theymaybeexaggeratedanddrawnoutofscale.GasketexaggeratedlydrawnDrawingMethodsofAssemblyDrawingsSimplifiedDrawingMethodManufacturingfeaturessuchassmallfillets,chamfers,andreliefgroovesmaybeomitted.ReliefgroovenotdrawnChamfernotdrawnUsedashedlinestoindicatescrewcenterpositionsIdenticalthreadedfastenersandotherrepetitivepartsneedonlybedetailedinonelocation;elsewhere,indicatetheircenterpositionswithdashedlines.Insectionalviewsofbearings,thebearing’sfeaturerepresentationandprescribeddrawingmethodsmaybeused.PrescribeddrawingmethodforbearingsSummaryofThisLecture

ContentofAssemblyDrawings

DrawingMethodsforAssemblyDrawings主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege2.DimensioningandComponentNumberingonAssemblyDrawingsIntroductionMainContent01DimensioningonAssemblyDrawings02ComponentNumberingandItemizedPartsListonAssemblyDrawingsPartIDimensioningonAssemblyDrawingsPARTIDimensioningonAssemblyDrawings0304020501Performance(Specification)DimensionsAssemblyDimensionsInstallationDimensionsOverallDimensionsOtherImportantDimensionsDimensioningonAssemblyDrawings1.Performance(Specification)DimensionsPerformance(specification)dimensionsareusedtorepresentthespecificationsorperformanceofamachineorcomponent.Theyarethe

primarybasisforthedesignandselectionofparts.

DimensioningonAssemblyDrawingsDimensioningonAssemblyDrawings2.AssemblyDimensionsAssemblydimensionsareusedtoensurethecorrectassemblyrelationshipbetweenthepartsinanassembly.Thesedimensionsincludefitdimensionsandtherelativepositionsofkeycomponents.DimensioningonAssemblyDrawingsDimensioningonAssemblyDrawings3.

InstallationDimensions

Installationdimensionsareusedtoindicatetherequireddimensionsforinstallingtheassemblyontoafoundationorothermachinesorcomponents,essentiallydefiningtheinstallationlocation.DimensioningonAssemblyDrawingsDimensioningonAssemblyDrawings4.OverallDimensionsOveralldimensionsareusedtorepresenttheexternaloutlineoftheassembly,includingitstotallength,width,andheight.Thesedimensionsnotonlyreflectthesizeoftheassemblybutalsoprovideabasisforthespacerequiredforpackaging,transportation,andinstallationoftheassembly.DimensioningonAssemblyDrawingsDimensioningonAssemblyDrawings5.

OtherImportantDimensions

Indesign,therearealsootherimportantdimensionsdeterminedthroughcalculationsoraccordingtospecificrequirements,whichdonotfallundertheabovecategories.Examplesincludethemaximummovementpositionsofmovingparts,thecenterdistancebetweentwogears,andimportantstructuraldimensionsofmajorcomponents.PartIIComponentNumberingandItemizedPartsListonAssemblyDrawingsPARTIIComponentNumberingandItemizedPartsListonAssemblyDrawingsTofacilitatereadingtheassemblydrawing,assignuniquereferencenumberstoallpartsandcomponents.Drawthepartsdetailtableabovethetitleblockandpopulateitbylistingeachpartinthetableaccordingtoitsreferencenumberasshownonthedrawing.Fillasoliddotwithinthevisibleoutlineofthepartorcomponenttobenumbered.Fromthisdot,drawaleaderline.Attheendoftheleaderline—onitshorizontalsegment,insideacircle,oradjacenttotheline—writethereferencenumber.Thereferencenumber’sfontsizeshouldbeoneortwosizeslargerthanthatofthedimensionnumbersontheassemblydrawing.Leaderlinesandcirclesaredrawnwithfinesolidlines(seeFiguresa,b,andc).Forverythinpartsorheavilyhatchedsectionareaswhereplacingadotisimpractical,useanarrowtopointtothepart’soutline(seeFigured).Thefontsizeofthereferencenumbershouldbeonesizelargerthanthefontsizeofthedimensionnumbersontheassemblydrawing.Thefontsizeofthereferencenumbermayalsobetwosizeslargerthanthefontsizeofthedimensionnumbersontheassemblydrawing.Thefontsizeofthereferencenumbermayalsobetwosizeslargerthanthefontsizeofthedimensionnumbersontheassemblydrawing.（a)（b)（c)（d)ComponentNumberingandItemizedPartsListonAssemblyDrawings1.MethodofAnnotatingPartReferenceNumbersComponentNumberingandItemizedPartsListonAssemblyDrawings

1.MethodofAnnotatingPartReferenceNumbers

Asetoffastenersoragroupofcomponentswithclearassemblyrelationshipscanuseasharedleaderline.Allpartsandcomponentsintheassemblydrawingmustbeassignedareferencenumber.Identicalpartsandcomponentsintheassemblydrawingshouldhavethesamereferencenumberandaregenerallylabeledonlyonce.Ifthesamepartappearsmultipletimes,itmaybenecessarytorepeatthenumbering.Thereferencenumbersontheassemblydrawingshouldcorrespondwiththenumbersintheitemizedpartslist.Leaderlinesshouldnotintersect,andwhenpassingthroughcross-sectionalareas,thedirectionoftheleaderlineshouldnotbeparalleltothesectionline.Thereferencenumbershouldbeplacedoutsidethecontourlinesofthepart.Thenumberingshouldbeorganizedinaclockwiseorcounterclockwisedirection.Ifcontinuousnumberingacrosstheentiredrawingisnotpossible,numberscanbearrangedsequentiallyinhorizontalorverticaldirections.ComponentNumberingandItemizedPartsListonAssemblyDrawings2.ConsiderationsforPartNumberingThecontentoftheitemizedpartslistgenerallyconsistsofthereferencenumber,code,name,quantity,material,mass(peritem,total),andremarks,andmaybeadjustedaccordingtoactualneeds.

Theitemizedpartslistisgenerallypositionedabovethetitleblockand

filledinfrombottomtotop

(allowingadditionalpartstobeaddedbycontinuingtodrawboxesupwards).Thenumberofboxesdependsontheneed.Ifthereisinsufficientspaceforextendingthelistupwards,itcanbeplacedadjacenttotheleftsideofthetitleblock,extendingupwards.SimplifiedPartsListFormatComponentNumberingandItemizedPartsListonAssemblyDrawings3.ItemizedPartsListforAssemblyDrawingsSummaryofThisLectureDimensioningonAssemblyDrawingsComponentNumberingandItemizedPartsListonAssemblyDrawings主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege3.AssemblyDrawingofPunchingDiesTianjinLightIndustryVocationalTechnicalCollegePart1IntroductionPART01IntroductionseatbeltconnectorDieofseatbeltconnectorPart2WorkingProcessofPunchingDiesPART02WorkingProcessofPunchingDiesDieSinkingWorkingProcessofPunchingDiesClosureWorkingProcessofPunchingDiesBerigorousWorkingProcessofPunchingDiesPart3HowtoRepresentAssemblyDrawingofPunchingDiesPART03RepresentationofAssemblyDrawingofPunchingDiesTechnicalrequirementsAgroupofviewsNecessarydimensionTitlesanddetailsManufacturingdrawingandlayoutdrawingPartNo.Manufacturing

DrawingandLayoutDrawingThemanufacturingdrawing,alsoreferredtoastheworkpiecedrawing,mustspecifythedimensions,tolerances,andotherrelevantparametersoftheworkpiece.Formulti-processformingoperations,inadditiontothemanufacturingdrawingofthecurrentprocess,thesemi-finishedproductdrawingofthepreviousprocessshouldalsobeprovidedandpositionedtotheleftofthecurrentprocess'smanufacturingdrawing.Forassemblydrawingsthatincludeablankingprocess,alayoutdiagram(nestingdiagram)mustbeincluded.Thewidthandtoleranceofthestripmaterial,thestepdistance,andtheknockoutallowanceshouldbeclearlyindicatedonthelayoutdiagram.Boththemanufacturingdrawingandthenestingdiagramshouldbedrawntoscale,typicallyconsistentwiththescaleofthediedrawing.Inspecialcases,thescalemaybeenlargedorreducedasnecessary.RepresentationofAssemblyDrawingofPunchingDiesGenerally,theassemblydrawingofastampingdieisrepresentedusingafrontviewandatopview.Ifadditionalclarityisrequired,otherviewsmaybeadded,typicallydrawntoa1:1scale.Thefrontviewshoulddepictthestampingdieasseenfromtheoperator'sperspectiveandisgenerallypresentedasasectionalview.Itisusuallydrawnintheclosedpositionofthedie,withthefinishedstampedpartpositionedbetweentheupperandlowerdies.Thecross-sectionistypicallycoloredredorblackforclarity.Thedraftingofthefrontviewgenerallyadherestothenationalstandardsformechanicaldrawing.However,certainindustrypracticesandspecialdraftingmethodsarealsoadopted.Forexample,instampingdiedrawings,tominimizetheuseofpartialviews,partsofthecross-sectionlineareathatdonotinterferewiththeexpressionofsectionaldetailsmayberotatedortranslatedontothesectionalview.ViewRepresentationSchemeRepresentationofAssemblyDrawingofPunchingDiesThetopviewcorrespondstothefrontviewandprovidesinformationabouttheplanararrangementofthediecomponents,thenestingmethod,andthecontourshapeofthediecavity.Inpractice,theupperdieportionistypicallyomittedinthetopview,andonlythelowerdie'svisibleportionfromaboveisrepresented.Thecontoursofthemanufacturingdrawingandthenestingdiagramaredrawnwithchain-dottedlinesonthetopview.ViewRepresentationSchemeRepresentationofAssemblyDrawingofPunchingDiesNecessarydimensionsmustbeindicatedontheassemblydrawing,suchasthecloseddiesize(ifthefrontviewshowsthedieintheopenposition,thisdimensionshouldbespecifiedinthetechnicalrequirements),theoveralldimensionsofthedie,etc.Fitdimensionsandgeometrictolerancesaregenerallynotannotated.DimensioningRepresentationofAssemblyDrawingofPunchingDiesRepresentationofAssemblyDrawingofPunchingDiesConclusionWorkingProcessofPunchingDiesHowtoRepresentAssemblyDrawingofPunchingDies主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege4.DrawinganassemblydrawingsIntroductionMainContentStepsforDrawingAssemblyDrawingsDrawingtheAssemblyDrawingofaSlidingBearingsMainContentPartIStepsforDrawingAssemblyDrawingsPARTI12345Analyzetheassembly.Selectthemethodofrepresentation.Setthedrawingscale,choosethedrawingsheetsize,anddrawtheconstructionreferencelines.Createthepreliminarysketch.Reviewandrevisethedrawing,addsectionlines,anddarkenalllinesinthedrawing.Annotatedimensions,assignreferencenumbers,completethepartslist,addtechnicalrequirements,andfillinthetitleblock.StepsforDrawingAssemblyDrawings6Theviewsintheassemblydrawingmustmaintainthecorrectprojectionrelationships.Theindividualpartsandstructuralelementsmustalsoconformtotheseprojectionrelationships.Toensuretheaccuraterelativepositioningofparts,thereferencepartthatservesapositioningroleinthemainassemblyaxisshouldbedrawnfirst.Thepositioningreferencemustbeclearlyestablished,andthentheoutlinesofthepartsshouldbedrawnsuccessively,preferablystartingfromthecontactsurfacesofeachpart.Theselectionofthereferencepartshouldbedeterminedbasedonthespecificmachineorcomponentthroughanalysis.Whendrawingeachpartintheassemblydrawing,theassemblyrelationshipwithadjacentpartsmustbecontinuouslychecked.Differentconditions,suchascontactsurfaces,matingsurfaces,andclearances,mustbecorrectlyandclearlyexpressed.Itisalsonecessarytocheckforanyinterferencesbetweenpartsandmaketimelycorrections.Steps