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1、常州工学院毕业设计(论文)外文文献学院机电学院专业班级10成型一学生姓名高丽君指导教师陈怀国A.MoldComponetsMoldsusedininjectionmoldingconsistoftwohalves;onestationaryandonemovable.Thestationaryhalfisfasteneddirectlytothestationaryplatenandisindirectcontactwiththenozzleoftheinjectionunitduringoperation.Themovablehalfofthemoldissecuredtot
2、hemovableplatenandusuallycontainstheejectormechanism.Therearemanypossiblemolddesigna,includingmultiplepiecemoldsforcomplicatedparts.Onproductionmoldingequipmentmanyarticlesmaybeshotatthesametimebytheuseofmultiplecavitymolds.Theuseofabalancedrunnersystemcarriestheplasticfromthespruetoeachindi
3、vidualcavity.Atthispointhematerialpassesthroughagateintothecavity.Thegateisarestriction,smallerthentherunner,toprovideforevenfillingofthemoldcavityandtoallowtheproductstobeeasilyremovedformtherunnersystem.Withmostinjectionmoldingsystem,thearticlescanbesnappedawayfromtherunnerorspruewithoutad
4、ditionaltrimming.Prouductsthathavebeeninjectionmoldedcanusuallybeidentifiedbyfindingwherethegatewasbrokenoff.Thegatewillusuallybelocatedattheedgeorpartinglineofanobjectorinthecenterofcylindricalproduct.Moldsareexpensive,asarethemachines.Yet,oncetheproducthasbeendesigned,moldsmade,andproducti
5、onstared,articlescanbeproducedinquantityatlowcost.Virtuallyallthermoplasticscanbeinjectionmoldedthroughvariationsinmoldandmachinedesign.Mold(anddie)partsthataremass-producedandstandardizedinshapeanddimensionarereferredtoas“standards”(or“standardparts”).Specializedoperatorsofmillingmachines,l
6、athes,lathes,electronicdischargemachining(EDN)equipmentandgrindersproducemoldcomponentsindependentlyofeachother,followingdetaiedmoldpartdrawings.Finally,alltheseitemscometogetherwiththestandardmoldbaseandhardwareandareassembledbythemoldmaker.Today,standardcomponentsforthemoldmakingindustryar
7、emarketedbyanumberofcompanies.Fig.3.1.1illustratethestandardcomponentsforMolds.Table3.1.1Statusofstandardization(1998)componentsforCompression,Injection,andDie-CastMoldPos.No.DenominationStandardDINISO1Plate,plain16760-16753-22Plat,drilledV16760-2/