模具毕业设计论文外文翻译

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1、InjectionMoldingThebasicconceptofinjectionmoldingrevolvesaroundtheabilityofathermoplasticmaterialtobesoftenedbyheatandtohardenwhencooled.Inmostoperations,granularmaterial(theplasticresin)isfedintooneendofthecylinder(usuallythroughafeedingdeviceknownasahopp

2、er),heated,andsoftened(plasticizedorplasticated),forcedouttheotherendofthecylinder,whileitisstillintheformofamelt,throughanozzleintoarelativelycoolmoldheldclosedunderpressure.Here,themeltcoolsandhardensuntilfullyset-up.Themoldisthenopened,thepieceejected,a

3、ndthesequencerepeated.Thus,thesignificantelementsofaninjectionmoldingmachinebecome:1)thewayinwhichthemeltisplasticized(softened)andforcedintothemold(calledtheinjectionunit);2)thesystemforopeningthemoldandclosingitunderpressure(calledtheclampingunit);3)thet

4、ypeofmoldused;4)themachinecontrols.Thepartofaninjection-moldingmachine,whichconvertsaplasticmaterialfromasoldphasetohomogeneousseni-liguidphasebyraisingitstemperature.Thisunitmaintainsthematerialatapresenttemperatureandforceitthroughtheinjectionunitnozzlei

5、ntoamold.Theplungerisacombinationoftheinjectionandplasticizingdeviceinwhichaheatingchamberismountedbetweentheplungerandmold.Thischamberheatstheplasticmaterialbyconduction.Theplunger,oneachstorke;pushesunmeltedplasticmaterialintothechamber,whichinturnforces

6、plasticmeltatthefrontofthechamberoutthroughthenozzleThepartofaninjectionmoldingmachineinwhichthemoldismounted,andwhichprovidesthemotionandforcetoopenandclosethemoldandtoholdthemoldclosewithforceduringinjection.Thisunitcanalsoprovideotherfeaturesnecessaryfo

7、rtheeffectivefunctioningofthemoldingoperation.Movingplateisthememberoftheclampingunit,whichismovedtowardastationarymember.themovingsectionofthemoldisboltedtothismovingplate.Thismemberusuallyincludestheejectorholes6andmoldmountingpatternofblotholesor“T”slot

8、s.Stationaryplateisthefixedmemberoftheclampingunitonwhichthestationarysectionofthemoldisbolted.Thismemberusuallyincludesamold-mountingpatternofbolesor“T”slots.Tierodsarememberoftheclampingforceactuatingmechan