培训 injection_molding

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1、InjectionMoldingOutlineFactsandfiguresWhyinjectionmolding?GoalsAdvantagesDisadvantagesOverviewoftheinjectionmoldingprocessEquipmentMaterialsconsiderationCriticaloperationparametersMathematicalmodelingMoldflowanalysisCommercialsoftware“Inessence,injectionmoldingisaprocesswherebyasolidthermoplasti

2、cmaterialisheateduntilitreachesastateoffluidity,isthentransferredunderpressure(injected)intoaclosedhollowspace(moldcavity),andthencooledinthemoldtillitagainreachesasolidstate,conforminginshapetothemoldcavity.”IntroductiontoInjectionMoldingbyCliffordI.WeirFactsandFiguresThermoplastics:Injectionmo

3、lding-32%byweightExtrusion-36%Allothers-32%HistoryJohnHyattpatentedthefirstinjectionmolderin1872.FurtheradvancesweremadeinEuropethroughthe1920s.In1951,WilliamH.Willertinventedthefirstmoldermachinetouseascrewtoprovidecontinuousfeedofliquidmaterial.Fromthe1980son,themostsignificantdevelopmentsinin

4、jectionmoldinghavebeenintheareaofcomputerizationoftheprocess.(Rosato&Rosato)Ialsoinventedthefirstsyntheticmaterial,Celluloid,whichleadtomanyimportantadvancesintheplasticsindustry,includingtheinjectionmoldingindustry.JohnHyattWilliamWillertMyinvention,whichallowedcontinuousinjection,madeinjection

5、+blowmoldingfeasibleandfast.Thisisthemethodusedtocreatebottles,jarsandmanyothercontainers.GoalsProducehighqualitypartsintermsofaesthetic,functional,andmaterialpropertiesMaximizeprofitsbyreducingcycletimeAchievetheproperbalancebetweenqualityandcostAdvantagesTighttolerancepartsComplexgeometryVario

6、ussurfacetexturesHighlyrepeatableprocessLowcostinhighvolumeproductionAutomatedprocess,lowlaborcostNetshapePartsconsolidationDisadvantagesHighinitialcost-Mold,Injectionmachine,AuxiliaryequipmentEconomicalforhighvolumeproductionHighamountofscrapHighlevelofcompetitionOverviewPARTDESIGNMOLDEQUIPMENT

7、MATERIALInjectionMoldingMachineEquipmentInjectionmoldingmachineAuxiliaryEquipment:DrierChillerHeaterGranulatorMixer/BlenderRobotsMoldchangesystemInjectionMoldingMachineMainComponents:InjectionsystemMoldsystemClampingsystemCo