injection+moulding 发动机的喷射建模

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1、ProductionTechnologiesforBodyComponents(01OFNLO)InjectionMoldingComponentsBodyAutomotiveEngineeringfor–TorinodiDr.PaoloMINETOLAPolitecnicoProductionTechnologiesDefinition“Inessence,injectionmoldingisaprocesswherebyasolidthermoplasticmaterialisheateduntilitreachesastateoffluidity,isthentransf

2、erredunderpressure(injected)intoaclosedhollowspace(moldcavity),andthencooledinthemoldComponentstillitagainreachesasolidstate,conforminginBodyshapetothemoldcavity.”AutomotiveEngineeringfor–TorinoIntroductiontoInjectionMoldingbyCliffordI.WeirdiPolitecnicoProductionTechnologies2ItsimportanceInj

3、ectionmoldingisthemostimportantprocessusedtomanufactureplasticproducts.Itisideallysuitedtomanufacturemassproducedpartsofcomplexshapesrequiringprecisedimensions.Itisusedfornumerousproducts,rangingfromboathullsandlawnchairs,tobottlecups.Carparts,TVandComponentscomputerhousingsareinjectionmolde

4、d.BodyAutomotiveEngineeringforThermoplasticsprocessing:–Injectionmolding:32%TorinodiExtrusion:36%byweightAllothers:32%PolitecnicoProductionTechnologies3PlasticInjectionMoldingisamanufacturingtechniqueformakingpartsfromthermoplasticandthermosetmaterialsIncontrasttotheextrusion(whichmakes

5、continuouspartsofconstantcrosssection),injectionmoldingmakediscreteparts(withcomplexandvariablecrosssection)Moltenplasticisinjectedathighpressureintoamold,Componentswhichistheinverseofthedesiredshape.BodyAutomotiveEngineering–forThemoldismadefrommetal,usuallyeithersteeloraluminiumTorinowi

6、delyusedformanufacturingavarietyofparts,fromthedismallestcomponenttoentirebodypanelsofcarsPolitecnicoProductionTechnologies4InjectionMoldingPolymerisheatedtoahighlyplasticstateandforcedtoflowunderhighpressureintoamoldcavitywhereitsolidifies;moldedpartisthenremovedfromcavityProducesdiscretec

7、omponentsalmostalwaystonetshapeTypicalcycletime10to30sec,butcyclesofoneminuteormorearenotuncommonMoldmaycontainmultiplecavities,somultiplemoldingsareComponentsproducedeachcycleBodyImportantmeasureofthesizeofaninjectionmoldingisAutomotiveEngineer