注塑模具mold-003

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1、Undercutreferstotheconvexorconcaveareaofpart.Whenremovingthepartfromthemold,youneedsomedevicesothatthepartofthemoldwhichcontactstotheundercutcanbemovedtoremovethepartfromthemoldsincethepartwillnotberemovabledirectlywithoutthedevice.ThisprocessiscalledUndercutprocess.Und

2、ercutprocessusesdifferentmethodsdependinguponwhethertheundercutisoutsideorinsidethepart.Herearesomeexamplesofpartswithundercut.Push-pinGripofadriverGripofacupNow,let'slearnaboutexternalslidecoremethod,internalslidemethod,andhydrauliccylindermethodofundercutprocess.Exter

3、nalSlideCoreMethodTheexternalslidecoremethodisusuallyusedfortheprocessofouterundercut.Workingalongwiththeopen/closemovementofamold,thismethodslidestheslidecoretoprocesstheundercut.Thehydrauliccylindermethodisalsoavailable,whichwillbeexplainedindetaillaterSlideCoreBodyUn

4、itTheportionwheretheundercutprocessisperformedlinkedalongwiththemovementofmoldopening.Theamountofmovementoftheslidecoreandtheangleandthelengthoftheangularpinarekeyfactorstothisunit.Thelockingblockinstalledtothecavityplatereceivesthepressurefromtheinjectionwhenclosingthe

5、mold.Uponopeningofthemold,theslidecoremovesbackwardbytheforcefromtheangularpinandthespring,thusreleasingthepart.Astheholewillbemisalignedandtheangularpinwillnotbeinsertediftheslidecore8movestoofarbackward,acorestopblockneedstobeinstalled.Thiscorrelationisillustratedbelo

6、w.(Clickeachnameinthefiguretodisplaythedescription.)窗体顶部窗体底部Thereliefdistanceandthetiltangleoftheangularpinareasfollows:S:UndercutamountS1:Slidestrokeamount:Tiltangleofslidecore:TiltangleofangularpinS1=S+5mmup=+(2-5)20Inordertopreventtheslidecoreandthelokingblockfromint

7、erveningwitheachotherinmoldopeningandclosing,makethetiltangleoftheangularpinsmallerthanthatofthelockingblock.Also,agapof0.5mmisaddedtotheholeforangularpinforerrorsoccurringatprocessing.PushBackSpringThemasswhentheslidecoreisslidingvariesdependingonthedirectionofsliding.

8、8Supposeyouinstalla5kgslidecoreonthesideparalleltotheground.Howlongshouldthespringbe?Thestrokeis20mm.