模具毕业设计论文外文翻译

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1、InjectionMoldingThebasicconceptofinjectionmoldingrevolvesaroundtheabilityofathermoplasticmaterialtobesoftenedbyheatandtohardenwhencooled.Inmostoperations,granularmaterial(theplasticresin)isfedintooneendofthecylinder(usuallythroughafeedingdeviceknownasahopper),heated,andsoftened(p

2、lasticizedorplasticated),forcedouttheotherendofthecylinder,whileitisstillintheformofamelt,throughanozzleintoarelativelycoolmoldheldclosedunderpressure.Here,themeltcoolsandhardensuntilfullyset-up.Themoldisthenopened,thepieceejected,andthesequencerepeated.Thus,thesignificantelement

3、sofaninjectionmoldingmachinebecome:1)thewayinwhichthemeltisplasticized(softened)andforcedintothemold(calledtheinjectionunit);2)thesystemforopeningthemoldandclosingitunderpressure(calledtheclampingunit);3)thetypeofmoldused;4)themachinecontrols.Thepartofaninjection-moldingmachine,w

4、hichconvertsaplasticmaterialfromasoldphasetohomogeneousseni-liguidphasebyraisingitstemperature.Thisunitmaintainsthematerialatapresenttemperatureandforceitthroughtheinjectionunitnozzleintoamold.Theplungerisacombinationoftheinjectionandplasticizingdeviceinwhichaheatingchamberismoun

5、tedbetweentheplungerandmold.Thischamberheatstheplasticmaterialbyconduction.Theplunger,oneachstorke;pushesunmeltedplasticmaterialintothechamber,whichinturnforcesplasticmeltatthefrontofthechamberoutthroughthenozzleThepartofaninjectionmoldingmachineinwhichthemoldismounted,andwhichpr

6、ovidesthemotionandforcetoopenandclosethemoldandtoholdthemoldclosewithforceduringinjection.Thisunitcanalsoprovideotherfeaturesnecessaryfortheeffectivefunctioningofthemoldingoperation.Movingplateisthememberoftheclampingunit,whichismovedtowardastationarymember.themovingsectionofthem

7、oldisboltedtothismovingplate.Thismemberusuallyincludestheejectorholes6andmoldmountingpatternofblotholesor“T”slots.Stationaryplateisthefixedmemberoftheclampingunitonwhichthestationarysectionofthemoldisbolted.Thismemberusuallyincludesamold-mountingpatternofbolesor“T”slots.Tierodsar

8、ememberoftheclampingforceactuatingmechan