知识辅助注射模具三维CAD设计系统(5)

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Fig.5TheIKB-MOULDenvironment

3.2.1Thepre-mouldprocess

Productmouldabilityisevaluatedinthispre-mouldprocess.Someissuestobeconsideredarematerialthermalexpansion,theplastic owdirectionandtheproductdraftangle.Thesystemnotonlyallowsexpe-riencedmoulddesignerstode netheshrinkageoftheproductmodel,butalsotorecommendproductshrinkageusingthemateriallibrary.Thismaterialli-braryisamaterialdatabasethatstoresinformationaboutthematerial’sviscosity,temperaturesensitivity,anddegreeofdi erentialshrinkage.Basedonthegenerictypeofmaterialused,IKB-MOULDsystemretrievesthematerialshrinkageratefromthemateriallibrary.Onceshrinkageisdetermined,theproductmodelisreconstructedtoaccountformaterialshrink-agethatoccursduringthemouldoperation.3.2.2Theinitialmoulddesign

Mouldspeci cationisdoneintheinitialstageoftheinjectionmoulddesign.Therequirementsoftheplasticcomponentarespeci edatthisstage.Decisionsmadeatthisstageincludeafunctionalanalysis,thenumberofcavities,thecavitieslayoutandthetypeofmouldcon- guration.Theinitialdesignplaysanimportantroleinthemoulddesign.Oncetheinitialdesignstageis

completed,

Figure1showsthebasicstructureoftheinjectionmoulddesignprocessintheIKB-MOULD.TheIKB-MOULDiscomposedofthefollowingmodules:aproductmodelinterface,amoulddesignmodule,aknowledgebaseandsomeotherlibraries.3.1Theproductmodelinterface

TheproductmodelistheinputtotheIKB-MOULDdesignprocess.Thismodelcanbeasolid,standardengineeringinterchange,orasurfaceorwire-framemodel.TheIKB-MOULDsystemprovidesaproductmodelinterfacetoacceptasolidmodelbuiltindi erenttypesofsolidmodellingsoftware.ItcandirectlyloadtheproductmodelbuiltinSolidDesigner.IftheproductisdevelopedfromaCADsystemthatisotherthanSol-idDesigner,thentheproductneedstobeconvertedusingSTEP,IGESorDXF.3.2Themoulddesignmodule

TheinjectionmoulddesignprocessofthemoulddesignmoduleinIKB-MOULDcoversthepre-mouldingpro-cess,theinitialmoulddesignandthedetailedmoulddesign.

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