数控技术应用专业英语 教学课件 ppt 作者 刘小芹ppt 6.Injection Molding Machine.ppt

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1、EnglishonMechanicalEngineeringLesson6InjectionMoldingMachineTextAninjectionmoldingmachineisamachineforconverting,processingandformingofrawplasticmaterialofpowder,pelletsintoapartofdesiredshapeandconfiguration.Theprocessofinjectionmoldingconsistsofheatingpl

2、asticmaterialuntilitmelts,thenforcingthismoltenplasticintoamoldwhereitcoolsandsolidifies.Fig.1showsastraighthydraulicinjectionmoldingmachine.TextClampingunitClampingunitisthepartofaninjectionmoldingmachineinwhichthemoldismounted,andwhichprovidesthemotion

3、andforcetoopenandclosethemoldandtoholdthemoldclosedwithforceduringinjection.Thisunitcanalsoprovideotherfeaturesnecessaryfortheeffectivefunctioningofthemoldingoperation.Movingplateisthememberoftheclampingunit,whichismovedtowardastationarymember.Themovingsec

4、tionofthemoldisboltedtothismovingplate.Movingplateusuallyincludestheejectorholesandmoldmountingpatternofblotholesor“T”slots.Stationaryplateisthefixedmemberoftheclampingunitonwhichthestationarysectionofthemoldisbolted.Stationaryplateusuallyincludesamoldmoun

5、tingpatternofboltholesor“T”slots.Tierodsaremembersoftheclampingforceactuatingmechanismthatserveasthetensionmembersoftheclampwhenitisholdingthemoldclosed.Theyalsoserveasaguidememberforthemovableplate.Ejectorisaprovisionintheclampingunitthatactuatesamechanis

6、mwithinthemoldtoejectthemoldedpart(s)fromthemold.Theejectionactuatingforcemaybeappliedhydraulicallyorpneumaticallybyacylinder(s)attachedtothemovingplate,ormechanicallybytheopeningstrokeofthemovingplate.TextInjectionunitInjectionunitconvertsaplasticmater

7、ialfromasolidphasetohomogeneoussemi-liquidphasebyraisingitstemperature.Thisunitmaintainsthematerialatapresenttemperatureandforcesitthroughtheinjectionunitnozzleintoamold.Theplungerisacombinationoftheinjectionandplasticizingdeviceinwhichaheatingchamberismou

8、ntedbetweentheplungerandthemold.Thischamberheatstheplasticmaterialbyconduction.Theplunger,oneachstroke;pushesunmeltedplasticmaterialintothechamber,whichinturnforcesplasticmeltatthefrontofthechamberoutthrought