工艺参数对聚丙烯微圆柱阵列充填性的影响研究

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1、Abs仃actAbstractWiththedevelopmentofMEMSandMST，Micro—injectionmolding(MIM)isobtainingmoreattentionasanimportantmicroformingprocess，whichisbecomingmoreandmoremature．Microinjectionmoldingproductsarewidelyusedinthefieldofaerospace，medical，automation，automotiveindust

2、ry，opticsaswellasdailylife．Micro．injectionmoldinghasmanygoodfeatures，suchas，lowproductioncost，widelyadaptabilityofmaterials，applicabilityforcomplexgeometryandsize，continuouslyandautomatlyproductionandSOon．Now，researchersarefouceontheaspectsofthemicroinjectionmol

3、dingequipment，themicro—moldmanufacturingandprocessing，themicromoldingmaterialselection，micro—moldingprocesscontrol，themicro．moldingformingtheoryandnumericalsimulationanalysis，themicroproductsqualitycharacterizationofthemicro-injectionmoldingtechnology．Inthiswork

4、，TheinfluenceofprocessingparametersonthefillingbehaviorsofiPPmicroarraystructuralWasinvestigatedbynumericalanalysisandinjectionmoldingexperiments．Themaincontentsandconclusionsareasfollows：(1)ProductModle，Thethree．dimensionalmodeloftheproductisdrawedbythePro／E3Dg

5、raphicssoftware．whichsizeis16mm×12mm×3mm，mecylinderdiameteriS500gm．andthereiS2mmdistancebetweencolumns．BeforeweusetheMoldflowsoftwaretosimulatethemeltedpolymerfillingprocess，weshouldfirstmeshthemodle．Inordertoobtaintheaccuracyanalysisanduniformitymesh，weusetheHy

6、permeshsoftwaretomeshtheproductmodel，andthecavityandthemicro．structureismeshedbydifferentmeshingstrategies，theglobaledgelengthofthebaseandthecylindricalis0．5mmand0．1mm．ThenthemodelisimportedintoMoldflowsoftwaretocreatetherunnersandthenstartingthesimulationanalys

7、is．Fromthefillinganalysisresultweknowthatthegatingsystemisreasonableandtheproductisfilledfully．Theplasticmeltflowfrontissimilartotraditionalinjectionmoldingwhichlikesfountain．Theinjectionspeedhasagreatimportanceonthemicrocylinderfillingheight，thefillingheightisi

8、ncreasingfollowtheinjectionspeedincreasing．ThecavitationsgenerateinthefillingprocessdistributingonthetopofIIImicro。cylindricalortheedgeofthesubstrate．Theshapeofthemel