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，automotive

2、industry，opticsaswellasdailylife．Micro．injectionmoldinghasmanygoodfeatures，suchas，lowproductioncost，widelyadaptabilityofmaterials，applicabilityforcomplexgeometryandsize，continuouslyandautomatlyproductionandSOon．Now，researchersarefouceontheaspectsofthemicro

3、injectionmoldingequipment，themicro—moldmanufacturingandprocessing，themicromoldingmaterialselection，micro—moldingprocesscontrol，themicro．moldingformingtheoryandnumericalsimulationanalysis，themicroproductsqualitycharacterizationofthemicro-injectionmoldingtec

4、hnology．Inthiswork，TheinfluenceofprocessingparametersonthefillingbehaviorsofiPPmicroarraystructuralWasinvestigatedbynumericalanalysisandinjectionmoldingexperiments．Themaincontentsandconclusionsareasfollows：(1)ProductModle，Thethree．dimensionalmodeloftheprod

5、uctisdrawedbythePro／E3Dgraphicssoftware．whichsizeis16mm×12mm×3mm，mecylinderdiameteriS500gm．andthereiS2mmdistancebetweencolumns．BeforeweusetheMoldflowsoftwaretosimulatethemeltedpolymerfillingprocess，weshouldfirstmeshthemodle．Inordertoobtaintheaccuracyanalys

6、isanduniformitymesh，weusetheHypermeshsoftwaretomeshtheproductmodel，andthecavityandthemicro．structureismeshedbydifferentmeshingstrategies，theglobaledgelengthofthebaseandthecylindricalis0．5mmand0．1mm．ThenthemodelisimportedintoMoldflowsoftwaretocreatetherunne

7、rsandthenstartingthesimulationanalysis．Fromthefillinganalysisresultweknowthatthegatingsystemisreasonableandtheproductisfilledfully．Theplasticmeltflowfrontissimilartotraditionalinjectionmoldingwhichlikesfountain．Theinjectionspeedhasagreatimportanceonthemicr

8、ocylinderfillingheight，thefillingheightisincreasingfollowtheinjectionspeedincreasing．ThecavitationsgenerateinthefillingprocessdistributingonthetopofIIImicro。cylindricalortheedgeofthesubstrate．Theshapeofthemel