主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege1.FormsofAssemblyandMethodsofConnectionforCompositeSolidsPartILessonIntroductionPARTIFormsofCombinationinCompositeSolids:1.StackedCombinationSolid2.Cutting(orExcavatedCutting)CombinationSolidLessonIntroduction

PartIIFormAnalysisofCompositeSolidsPARTII1.

StackedCompositeSolidsCoaxialStackingFormAnalysisofCompositeSolids2.

Cut(Excavated)CompositeSolids(continued)FormAnalysisofCompositeSolidsStackedCompositeSolids(continued)SymmetricalStackingAsymmetricalStackingFormAnalysisofCompositeSolidsThemostcommonformsofcompositesolidsareacombinationof

stackingandcutting

methods.FormAnalysisofCompositeSolidsPartIIIMethodsofConnectingCompositeSolidsPARTIII

Plane1Plane2CoplanarPlane2Plane1Non-coplanarTangentIntersectingMethodsofConnectingCompositeSolids1.

Coplanar—TwoplanesarecoplanarPlane1Plane2

Whenflush,noseparatinglineMethodsofConnectingCompositeSolids1.

Coplanar—TwoplanesarecoplanarPlane2Plane1

Whennotflush,aseparatinglineappearsSolidlineMethodsofConnectingCompositeSolidsSurfaceTransitionRelationshipWhenTwoSolidsAreStacked(a)Flush(c)

Notflush(b)Frontflush,backnotflushDashedLineSolidLine

NoLineMethodsofConnectingCompositeSolids2.

TangencyandIntersection—WhenTwoSolidSurfacesAreTangent→NoLineattheTangentPointNolineNolineNoline●（a）（b）MethodsofConnectingCompositeSolids2.TangencyandIntersection—Whentwosolidsintersect,thelineofintersectionshouldbedrawnMethodsofConnectingCompositeSolidsVisiblelineVisibleline0102MethodsofCompositeSolidConstruction—Stacking,CuttingMethodsofCompositeSolidConnection—Coplanar,Non-coplanar,Tangent,IntersectionSummaryofThisLectureThinkingQuestions主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege2.DrawingtheThree-ViewProjectionsofaCompositeSolidPartILessonIntroductionPARTILessonIntroductionShapeAnalysisMethod:Basedontheshapeofthecompositesolid,decomposeitintoseveralparts,clarifytheshapeofeachpart,theirrelativepositions,andthemethodofcombination.Then,drawtheprojectionsofeachpartindividually.

PartIIDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodPARTIIDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethod

BossCylinderSupportplateRibBaseplateShapeanalysisSelecttheprincipal(front)viewChoosethescaleanddeterminethedrawingsheetsizeDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodShapeanalysisSelecttheprincipal(front)viewChoosethescaleanddeterminethedrawingsheetsizeGOODDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodShapeanalysisSelecttheprincipal(front)viewChoosethescaleanddeterminethedrawingsheetsizeThree-ViewProjectionofaBearingHousingDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodShapeanalysisSelecttheprincipal(front)viewChoosethescaleanddeterminethedrawingsheetsizeKeyPointstoObserveWhenDraftingthePreliminarySketchForm

AnalysisMethod：Startwiththeprimaryview,followedbythesecondaryviews;beginwithsuperimposition,thenproceedtocutting;drawlargershapesbeforesmallerones.Drawing

Sequence:

Drawtheprincipal(feature)viewfirst,thentheothertwoviews;drawthevisiblepartsfirst,thenthehiddenparts;drawarcsbeforestraightlines.Ensureallthreeviewsareconstructedincoordinationandsimultaneously.DrawingLines:

Linesmustbethin,light,andprecise.DrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodCheckandFinalizetheDrawing:Aftercompletingthepreliminarysketchofthefulldrawing,carefullyreviewittocorrectanymistakes,fillinanymissingorincompletelines,eraseanyunnecessaryconstructionlines,andthendarkenthelinesusingthestandardlinetypes.DrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodTitleblock①Baseplate1.Layoutthedrawing2.Draweachpartinsections:②

Verticalplate③RibplateUsesolidlinesforvisibleedges.Usedashedlinesforhiddenedges.3.ReviewanddarkenthelinesUseanHBorBpencil,andBor2Bleadforcompasses,anddarkenthedrawingaccordingtothespecifiedlinethicknessforeachtypeofline.Whendarkening,generallyfollowtheorderof:fromthicktothinlines,fromcurvestostraightlines,fromtoptobottom,andfromlefttoright.4.AdddimensionsandcompletethetitleblockDrawingtheThree-ViewProjectionsofCompositeSolidsUsingtheShapeAnalysisMethodWhensurfacesareflush,nolineshouldbedrawn.0102FormsofCompositeSolidCompositionMethodsofConnectingCompositeSolidsLessonSummaryPerformsoliddecompositionofthecompositeobject—divideintosections.Understandtheshapeandrelativepositionofeachpart.Drawtheprojectionsofeachsectiononebyone,basedontheirimportanceandspatialrelationships.Analyzeandaccuratelyrepresentthesurfacetransitionrelationshipsbetweenparts.Reviewanddarkenthedrawing.SummaryofThisLectureDrawthethree-viewprojectionsoftheillustratedsolid.ThinkingQuestion主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollege3.ReadingDrawingsUsingtheShapeAnalysisMethod

PartILessonIntroductionPARTILessonIntroduction

PartIIConceptoftheShapeAnalysisMethodPARTIIConceptoftheShapeAnalysisMethodcompositesolidsTheshapeanalysismethodinvolvesimaginingthedecompositionofacompositebodyintoseveralbasicbodies.Byunderstandingtheirshapesandrelativepositions,aswellasanalyzingtheirsurfaceconnectionrelationshipsandprojectioncharacteristics,thismethodallowsonetointerprettheanalysisofviews.ShapeAnalysisMethodformed

primarilybystackingApplicabilityEachviewiscomposedofseveralwireframeoutlines,eachrepresentingasimplesolid.ConceptoftheShapeAnalysisMethod

topandbottom

leftandright

frontandbackConceptoftheShapeAnalysisMethodReadingDrawingsusingtheShapeAnalysisMethodAnalyzetheshapeofeachsimplesolidindividually.Basedontherelativepositionsandsurfacerelationshipsofeachsimplesolid,mentallyreconstructtheentirecompositesolid.

PartIIIStepsforReadingDrawingsPARTIIIStepsforReadingDrawings從最能反映物體形狀、位置特征的主視圖入手，將復(fù)雜的視圖按線框分成幾個(gè)部分。Dividebywireframes,partbypartProjectandimagineshapesComprehensivelyimagineanddeterminetheoverallshapeStartwiththemainview,whichbestreflectstheobject’sshapeandpositionalfeatures.Breakthecomplexdrawingintoseveralpartsaccordingtothewireframes.Usingtheprojectionrulesofthethree-viewsystem,identifyeachwireframe’sprojectionintheotherviews.Beginwiththewireframesthatbestreflectshapecharacteristicsandmentallyreconstructthesimplesolidformsandstructureseachwireframerepresents.Startwiththeviewthatbestconveyspositionalfeatures.Combineitwiththeotherviews,andbasedontherelativepositionsofthewireframes,determinehowthesimplesolidsarearranged.Finally,mentallyreconstructtheoverallformofthecompositesolid.ⅡⅢⅠⅣStepsforReadingDrawingsDividebywireframes,partbypartStepsforReadingDrawingsProjectandimagineshapesStepsforReadingDrawingsProjectandImagineShapesStepsforReadingDrawingsProjectandImagineShapesStepsforReadingDrawingsTheL-shapedplateispositionedatthebottomItisplacedcentrally—leftandright—ontopofthebasepl