主講人：趙慧、楊國(guó)星TianjinLightIndustryVocationalTechnicalCollegeDrawingofstudconnectionsPartIIntroductiontotheClassPARTIIntroductionBoltConnectionScrewConnectionTheconnectedpartmustnotbetoothicktoallowfordrillingathroughhole.Whenoneoftheconnectedpartsisrelativelythick,itisnotsuitablefordrillingathroughhole.Unabletobearalargeload.Notsuitableforfrequentdisassembly.Easytodisassemble.Capableofbearingalargeload.ApplicationScenariosforStudConnectionsStructuralconstraintsmakeitunsuitabletouseaboltconnection.Oneoftheconnectedpartsisrelativelythickandcannotbedrilledintoathrough-hole.Frequentdisassemblymakesitunsuitabletouseascrewconnection.03

0102PartIIAssemblyProcessofDouble-EndStudConnectionsPARTIIAssemblyProcessofDouble-EndStudConnectionsScrewthestudintothethreadedholeofthethickerconnectedpart.Placetheconnectedpartwiththethroughholeontothestud.Addthespringwasher.Tightenthenuttosecuretheconnection.PartIIIDrawingProcessofDouble-EndStudConnectionsPARTIIIDrawingStepsforDouble-EndStudConnectionsFrontViewTopView

DrawthecenterlineA

DrawtheconnectedpartsThediameterofthethroughholeshouldbedrawn1.1timesthenominaldiameterofthebolt.Differentpartsshouldhaveinconsistentsectionlines.Thethreadedholeshouldbedrawnaccordingtothestandardmethodforinternalthreads,withspecialattentiongiventoensurethatthesectionlineisdrawntothethicksolidline.BDrawingStepsforDouble-EndStudConnectionsFrontViewTopViewbbm0.5d0.5d

DrawtheconnectedpartsBThedepthofthethreadedholeisequaltothescrewengagementdepth（bm）+0.5d,wheredisthenominalthreaddiameter.Thevalueofbmisdeterminedbythematerialofthepartbeingthreadedinto:

SteelintoSteel:

bm=1d；

SteelintoCastIron:bm=1.25or1.5d；

SteelintoAluminumAlloy:bm=2dThedepthoftheunprocessedthreadedholeis0.5d.DrawingStepsforDouble-EndStudConnectionsFrontViewTopView

Drawthedouble-endstudC

DrawthespringwasherDDrawthenutELThenominallengthofthestud,L=thicknessoftheconnectedpartδ+thicknessofthewashers+thicknessofthenutk+thereservedthicknessfortheboltprotrudingfromthenut0.3d.Thenominallengthoftheboltisestimatedusingthefollowingformula.δ0.2d0.8d0.3d≈+++Assumethatthethicknessoftheconnectingpartwithathroughholeisδ.Refertothetableandchoosethestandard-lengthvaluethatisgreaterthanandclosesttothecalculatedlength.Lδs0.3dks=0.2d,

k=0.8dDeterminationofNominalLengthDrawingStepsforDouble-EndStudConnectionsNotesThespringwashershouldbedrawninthediagramatanangleof60°tothehorizontalline,withtwolinespointingupwardtotheleftanddownwardtotheright.Thethreadterminationlineatthescrewedendofthestudshouldalignwiththematingsurface,indicatingfullengagementandadequatetightening.Thethreadedportionshouldbedrawnaccordingtothestandardmethodforexternalthreads,"coarseontheoutside,fineontheinside.Theunthreadedportionshouldbedrawnaccordingtothestandardmethodforinternalthreads,"fineontheoutside,coarseontheinside.SummaryofthisLecture:ApplicationsandCharacteristicsofDouble-EndStudConnections01AssemblyProcessofDouble-EndStudConnections02DrawingProcessofDouble-EndStudConnections03THINKINGQUESTIONSHowmanyerrorsdidyoufind?1Threadlinesconcealedbythenutandwashershouldbeerased.2Theslotorientationofthespringwashershouldberepresentedbytwolinesinclinedat60°tothehorizontal,oneslopingupwardtotheleftandtheotherdownwardtotheright.3Thethreadterminationlinemustbeflushwiththecontactsurfacesof