∙PocketInsert
Apocketinsertisgenerallyusedwhentheshapeofthepartissquare.
Apocketinsertisattachedtothemoldbyanattachingbolt,asshownbelow.
MakingInserts
Whenmakinganinsertoramold,becarefulwiththeaccuracyofmeasurementsothattheinsertandthemoldcanbeattachedwithoutagap.
Ifthemeasurementisnotaccurate,aninsertcannotbeattachedtoamold,oraburrmayresultduetothebiggap,andthepartwillnotlookgood.
Attachaninsertandamoldbyprocessingasfollows.
Foraflangeinsert:
Astheinsertismountedthroughthemold,chamfersareappliedtothemoldsidewhosecornerwillbeconvex.
Forapocketinsert:
Astheinsertismountedinthemold,chamfersareappliedtothemoldsidewhosecornerwillbeconvex.
Whenmakinganinsertoramold,chamfersareappliedtoitscorners.
ThecornerscannotbeprocessedatarightangleduetotheedgeRofcutwareorreliefofcutware,evenwhenaninsertoramoldismadeaccuratelyasmeasured.Ifaninsertisattachedtoamoldwithoutchamfering,thecornerwillinterfereandpreventtheinsertfrombeingattachedattheproperposition.
Also,anexcessivegapbetweenaninsertandamoldwillcausepartdefects.Therefore,besuretofulfillthematchingrequirement（positionaltoleranceofholeandaxis）thatisregulatedbytheJapaneseIndustrialStandard（JIS）.
Thechartbelowshowsthetypicalmatchingtolerances.
Holetolerance（φD）
Axistolerance（φd）
RegularProcess
H7
h6
PreciseProcess
H6
h5
Inthechartabove,theholetolerance（φD）referstothetoleranceoftheholesize（φD）ofthemoldintheabovefigure,andtheaxistolerance（φd）referstothetoleranceoftheaxissize（φd）oftheinsertintheabovefigure.
Asthematchingtolerancevariesdependingonouterdiameterofholeoraxisortypesofmatching（gapmatching,midpointmatching,ordrawmatching）,refertotheJISreferencechart.
PositionofInsert
Thepositionofaninsertisdeterminedbypartquantityortypeofinsert.
Thepositionsofinsertareasfollows:
Whenaflangeinsertisused:
Process
Theinsertisattacheddirectlytothemold,Boththeinsertandthemoldneedtobemadeprecisely.
Installation
Itiseasytopositiontheinserttoamoldbecausetheinsertismadeprecisely.
Whenapocketinsertisused:
Process
Themoldismadewiththemeasurementofaninsert+arunner.
Evenifthereisanerrorinthemoldmeasurement,themoldiseasilyprocessedbecausearunner（madebyaseparatepart）isusedforadjustment.
Installation
Itisdifficulttopositiontheinsertbecauseitisattachedwiththerunnerinsertedin-betweenandameasurementerrorcaneasilyoccur.
Whenapocketinsertisused:
Process
Themoldcanbeprocessedeasilybecauseawedgemeasurementisusedtoadjust,evenifthereisanerrorinamoldmeasurement.
Installation
Becauseaninsertisattachedsetout,anerrorbyattachmentoccurslessfrequentlyandinsertpositioningiseasy.
CorePlate/CavityPlate
Asteeldevicetomoldamoldingmaterialintoacertainshape.Thesectionthatisengagedinopening/closingmovementiscalledacoreplate,andthesectionthatisnotiscalledacavityplate.Generally,thefrontsideofapartisacavityplateandtherearsideisacoreplate.
Thecoreplateleavesatraceonapart,becauseithasanejectorpintopushthepart.
Thecavityplatehasaspruebush,whichistheentranceformoltenplastic.
Cavity
Thegapgeneratedwhereapartismoldedinthemold.
Itsometimesreferstotheconcavepartofthemoldandusuallyisprocessedonthecavityplate.
Insert（Core）
Apartofamoldtoshapeamoldingmaterial
Itismountedinasquareorroundholeonaretainerplateofamold.
Abrasionresistanceisrequiredforaninsertbecauseitconstantlyreceivesfrictiongeneratedbyheatorflowofmoltenplasticduringmolding,andthus,ahighqualitymaterialisusedforaninsert.Moldingismadeeasierforacomplicatedshapeortherepetitionofthesameshapewithinsertswhicharesmallandlight.
Theinsertinstalledonthecavitysideiscalledacavityinsert,andtheoneinstalledonthecoresideiscalledacoreinsert.Thepartshapeandmaterialdetermineswhichinserttouse.
Runner
Achannelthroughwhichmoltenplasticisguidedfromthespruebushintothecavityofthemold.Itssizeorshapeisdeterminedbythetypeofmoldingmaterial.
Alargerunnerallowsbetterflowofthemoldingmaterial;however,coolingtakeslonger.Thus,arunnerisnormallymadesmallerthanthesectionofapartandgraduallymadebiggerwhiletesting.Inanycase,arunnershouldbebasicallysmallerthanthethickestareaofthepart.
CoreStopBlock
Apartthatdeterminesthepositionwhereaslidecoreretreatswhenopeningthemold.
Inadditiontothecorestopblock,aballplunger,areturnspring,orastoppincanalsobeused.
LockingBlock
Ablocktopushaslidecorethatisejectedbackbyinjectionpressure.
AngleofAngularPinandAngleofAngledSideofLockingBlock
Angleofangularpin:
α
Angleofsideoflockingblock:
β
（1）Ifα>β:
Iftheangleofanangularpinislargerthantheangledsideofalockingpin,thetiltedsidesofaslidecoreandthelockingblockmaycollidewitheachother,possiblydamagingthemold.
（2）Ifα=β:
Iftheangleofanangularpinandatiltangleofalockingblockareequal,theslidecorecannotbelowered,sinceitispusheddownbyaspring,whichputsthelockingblockovertheslidecorefortheclearanceoftheangledholeoftheslidecore.
（3）Ifα<β:
Sincetheangledsidesoftheslidecoreandthelockingblocktoucheachotheronlywhenthemoldiscompletelyclosed,themovementissmooth.
From
（1）,
（2）,and（3）,theangleoftheangularpinmustbesmallerthantheangleoftheside.Thenormalangleoftheangularpinis12-25degree,andtheangleofthepartingsideisbasicallylargerthanthepinangle.
AngularPins
Aangledpinusedtoslideaslidecore.
Thetiltangleforanangularpinshouldbeunder25degreesatthemaximum.
SlideCore
Apartthatslidesinwarduponopeningandclosingofthemold.
Itworksontheundercutprocessalongwithmoldopening/closingmovementtomoldtheundercutofapart.
Thelargertheundercutbecomes,thelongeranangularpinneedstobeandthemorethemovementoftheslidecorewillbe;thereforeitmaynotbeeasilyused.
Theslidecoremovestoavoidretreatingbyinjectionpressureatthelockingblockwhenclosingthemoldandatthecorestopblockwhenopeningthemold.Inbetweenthem,anangularpincontrolsthemovementoftheslidecore.
CorePushBackSpring
Apartusedtoholddownaslidecorewhenamoldisopen.
Withoutthis,theslidecoremaybeoutofalignmentwhenthemoldisopen,andalsoanangularpinmaynotgointotheangledholewhenclosingthemold.
Itischangeddependingontheslidingdirectionoftheslidecore,suchasup,down,orhorizontal.
Undercut
Ashapethatpreventsapartfrombeingremovedintheopeningdirectionofam
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