知识辅助注射模具三维CAD设计系统(6)

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Fig.6Theinsert2Ddrawing

–Thedeterminationofthemouldbase.Theprojection

areaofthecavitylayoutalongtheejectiondirectioncanbeusedtodeterminetheminimummouldbasesize.TheIKB-MOULDhasamouldbaselibrarythatstoresmanystandardmouldbases(the xedhalfandthemovinghalf).

Designrulesandexpertknowledgeintheinitialmoulddesignprocessareregardedasheuristicknowl-edgeincorporatedintotheIKB-MOULD.Aftertheinitialdesign,amouldspeci cationcanbegenerated.

themouldstructureisdetermined.Suchaninitialdesignisusuallytheguidelineforthemouldquotation,themouldbaseorderingandthedetailedmoulddesign.

–Thedeterminationofthecavitynumber.Thenumber

ofcavitiescanbedeterminedusinganempiricalfor-mulathatconsidersdi erentfactors.Thesefactorsaretheperiodofdelivery,theminimumcost,theproductprecisionqualityrequirementorthemachinetechnicaldatasuchasthemaximumshotcapacityandtheclampingforce(Menges[25]).Yeetal.[26]determinedthecavitynumberbasedonamixedconsiderationofthreefactors:machinetechnicaldata,minimumcostanddeliverydate.

Oftenmoulddesignersdeterminethecavitynumberbasedontheirexperienceandsuggestedempiricalcalculationswithconsiderationtodi erentfactors.–Thedeterminationofthecavitylayout.Thecavitylayoutofaninjectionmouldusuallyincludesthelayoutpatternandorientationofeachcavityinthemould.Thelayoutpatterndependsonthecavitynumber.Abal-ancedlayoutpatterniscommonlyadoptedformultiplecavities,suchastwo-cavity,four-cavityandeight-cavity.Orientationofthecavitya ectsthepositionandorientationofthegatesystem.Inotherwords,cavityorientationandgatelocationshouldbebalanced.

3.2.3Thedetailedmoulddesign

Inthedetailedmoulddesign,theIKB-MOULDisdevelopedforthreedifferentandusefulapplicationsforusebythemoulddesigncompanies:thedesignforassembly,thedesignfora2DdrawingandthedesignforBOM.

(1)Thedesignforassembly.Aninjectionmouldisa

mechanicalassemblythatiscomposedoftheprod-uct-independentandproduct-dependentparts.De-signoftheproduct-dependentpartsisbasedonthegeometryextractedfromtheplasticproduct.Thisextractioncanberealisedbyintegratingsomeautomationalgorithmsandexpertknowledge.Thedesignofproduct-independentpartsisbasedonthedesigner’sexperienceandcatalogue

information.

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