模具组成简介.doc

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1、Thistrialversioncanuseonlyapartofitem.FunctionofMajorPartsYouwilllearnaboutthenamesandfunctionsofmajorpartsusedforanejectionsystem.Apushbackpinandacoilspringareusedforregularmolds,whereasapushbackpinandagasspringaresometimesusedforlargesizemolds.Thisfigureillustratesanexampleofal

2、argemold.-9-/9EjectorStopper(StrokeEndPin)Ablockthatstopsanejectorplatefromgoingforward[stoppin]-9-/9SprueLockPinsApinhastheedgeofwhichisundercuttopullapartinmoldopeningandremoveaspruefromaspruebush.Aftermoldopening,thispinwillfunctionasanejectorpinandejectsthespruefromaapruebush

3、.Alsoitreleasesgascontainedinmoltenplastic.-9-/9EjectorPlateAlsocalledapushplate.Aplatethatsupportsanedgeofanejectorpinorapushbackpintoejectapartfromamold.Itisejectedbyanejectordeviceofamoldingmachine,andreturnedtotheoriginalpositionwhentheedgeofapushbackpincollideswithacavitypla

4、teduringmoldclamping.-9-/9StopPinsAstopperinstalledtokeepanejectorplatehorizontalorpreventtheejectorplatefromretreatingtoofaranddamagingacoreadaptorplate.EjectorGuidePins/EjectorGuideBushAnejectorguidepinisalsocalledapushplateguidepinandfunctionsasaguideforslidingofanejectorplate

5、.-9-/9Becauseanejectorguidebushslides,ahardmaterialisused.Anejectorguidebushisalsocalledapushplateguidebush.Itisacylindricalpartusedtodeterminethepositionbymatchingtheejectorguidepin.PushRodsAshaftlinkedtotheforce(hydraulicormechanical)ofthemoldingmachineinordertogettheejectorpla

6、tetowork.-9-/9GasSpring/GasSpringHolderAgasspringforciblypushesbackanejectorplate.Thestrengthofthespringisadjustedbyadjustingthefillingpressure.Whenusingagasspring,makesuretoavoidhightemperature(heatmayexpandgas,deterioratingthe-9-/9originalfunctionsofagasspring).CalculatingFilli

7、ngPressureTofigureoutfillingpressure(P)fromearlyload(Wo):P=100*Wo/C(C:constant)Tofigureoutcorrespondingspringconstant(K)fromfillingpressure(P)andgasspringconstant(G):K=G*P/100Tofigureoutforcebydisplacement(x)fromthetopD.C.ofthepistonrod(W):W=P(Gx+C)*Seethecatalogofeachmanufacture

8、rforconstant(C)andgasspringconstant(G).A