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ID:13647743
大小:550.00 KB
页数:17页
时间:2018-07-23
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1、附录NumericalFillingSimulationofInjectionMoldingUsingThree—DimensionalModelAbstract:Mostinjectionmoldedpartsarethree-dimensional,withcomplexgeometricalconfigurationsandthick/thinwallsections.A3Dsimulationmodelwillpredictmoreaccuratelythefillingprocessthan
2、a2.5Dmode1.Thispapergivesamathematicalmodelandnumericmethodbasedon3Dmodel,inwhichanequal-ordervelocity-pressureinterpolationmethodisemployedsuccessfully.Therelationbetweenvelocityandpressureisobtainedfromthediscretizedmomentumequationsinordertoderivethe
3、pressureequation.A3Dcontrolvolumeschemeisemployedtotracktheflowfront.Thevalidityofthemodelhasbeentestedthroughtheananalysisoftheflowincavity.Keywords:threedimension;equal-orderinterpolation;simulation;injectionmolding1IntroductionDuringinjectionmolding,
4、thetheologicalresponseofpolymermeltsisgenerallynon-Newtonianandnoisothermalwiththepositionofthemovingflowfront.Becauseoftheseinherentfactors,itisdifficulttoanalyzethefillingprocess.Therefore,simplificationsusuallyareused.Forexample,inmiddle-planetechniq
5、ueanddualdomaintechnique[1],becausethemostinjectionmoldedpartshavethecharacteristicofbeingthinbutgenerallyofcomplexshape,theHele-Shawapproximation[2]isusedwhileananalyzingtheflow,i.e..Thevariationsofvelocityandpressureinthegapwise(thickness)dimensionare
6、neglected.Sothesetwotechniquesareboth2.5Dmoldfillingmodels,inwhichthefillingofamoldcavitybecomesa2Dprobleminflowdirectionanda1Dprobleminthicknessdirection.However,becauseoftheuseoftheHele-Shawapproximation,theinformationthat2.5Dmodelscangenerateislimite
7、dandincomplete.Thevariationinthegapwise(thickness)dimensionofthephysicalquantitieswiththeexceptionofthetemperature,whichissolvedbyfinitedifferencemethod,isneglected.Withthedevelopmentofmoldingtechniques,molded67partswillhavemoreandmorecomplexgeometryand
8、thedifferenceinthethicknesswillbemoreandmorenotable,sothechangeinthegapwise(thickness)dimensionofthephysicalquantitiescannotbeneglected.Inaddition,theflowsimulatedlooksunrealisticinasmuchasthemeltpolymerflowsonlyonsurfacesofcavit
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