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1、ISSUESINTHESELECTIONOFLOCKINGFEATURESININTEGRALATTACHMENTDESIGNUSINGSNAP-FITSSuatGenc,RensselaerPolytechnicInstitute,Troy,NY.Dr.RobertW.Messler,Jr.,RensselaerPolytechnicInstitute,Troy,NY.Dr.GaryA.Gabriele,RensselaerPolytechnicInstitute,Troy,NY.AbstractAmongotherfun
2、ctions,integralattachmentfeaturesareusedtoconstrainmatingpartsinanassemblyinTheuseofintegralattachmentfeaturesintheformofdirectionsotherwiseleftunconstrainedwhenthepartsaresnap-fitsinassembliescomprisedofplasticpartsisinitiallybroughttogether.Eitherlocatingorlockin
3、gproliferating.Atthehighest(i.e.,attachment)level,thefeatures,oracombinationofthetwotypes,canbeusedtofundamental(orrepresentative)shapeofbaseandmatingachievethisconstraint.Locatingfeaturesareinherentlyparts,imposedorselectedinstallationdirectionandrigidanddonotdiff
4、erfundamentallyfromoneanotherfromassemblymotion,andpossibleandpreferredattachmentformtoform.Unlikelocatingfeatures,lockingfeaturescombinationsmustallbedetermined.Oncethisisdone,havequitedifferentcharacteristicsandpropertiesfromformdecisionsmustbemadeonwhatspecifict
5、ypesandformsoftoform.Some,besidesprovidingtheirobviouslockinglocking,locating,andenhancementattachmentfeaturesarefunction,alsoproviderigidity,butmanydonot.Lockingmostappropriatefortheapplication.Thispaperfocusesonfeaturesare,ingeneral,theweakestportionofparttheissu
6、esthataffectlockingfeatureselection.assemblies.Theyaretobeusedonlytoconstrainpartmotionoppositetheinstallationdirection.OtherIntroductionunconstraineddirectionsshouldbeconstrainedbylocatingfeatures.Therefore,selectingaparticularlockingfeatureIntegralattachmentfeatu
7、resrefertoalldesignelementsrequiresmorecarethanselectingaparticularlocatingontheinterfacesofmatingpartsthatguide,assist,and/orfeature.Thisstudy,therefore,focusesonselectionofaccomplishengagementduringassemblywithoutseparatelockingfeaturesunderthetaskoffeatureselect
8、iontodecidefasteners.Integralattachmentfeatureshavebeendividedonformandpreferredorientation.intothreetypesbasedontheirprincipalfunction,namely:(1
