《机械制图及计算机绘图》英文课件-装配图的内容和画法

主讲人：赵慧、杨国星TianjinLightIndustryVocationalTechnicalCollegeContentsandDrawingMethodofAssemblyDrawingsIntroductionAnassemblydrawingisadiagramthatexpressestheworkingprinciple,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,