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1、编号：毕业设计(论文)外文翻译（原文）院（系）：应用科技学院专业：机械设计制造及其自动化学生姓名：邓瑜学号：0501120501指导教师单位：应用科技学院姓名：黄小能职称：2009年5月20日TheInjectionMoldingTheIntroductionofMoldsThemoldisatthecoreofaplasticmanufacturingprocessbecauseitscavitygivesapartitsshape.Thismakesthemoldatleastascritical-andmanyca
2、sesmoreso-forthequalityoftheendproductas,forexample,theplasticitingunitorothercomponentsoftheprocessingequipment.MoldMaterialDependingontheprocessingparametersforthevariousprocessingmethodsaswellasthelengthoftheproductionrun,thenumberoffinishedproductstobeproduce
3、d,moldsforplasticsprocessingmustsatisfyagreatvarietyofrequirements.Itisthereforenotsurprisingthatmoldscanbemadefromaverybroadspectrumofmaterials,including-fromatechnicalstandpoint-suchexoticmaterialsaspapermatchedandplaster.However,becausemostprocessesrequirehigh
4、pressures,oftencombinedwithhightemperatures,metalsstillrepresentbyfarthemostimportantmaterialgroup,withsteelbeingthepredominantmetal.Itisinterestinginthisregardthat,inmanycases,theselectionofthemoldmaterialisnotonlyaquestionofmaterialpropertiesandanoptimumprice-t
5、o-performanceratiobutalsothatthemethodsusedtoproducethemold,andthustheentiredesign,canbeinfluenced.Atypicalexamplecanbeseeninthechoicebetweencastmetalmolds,withtheirverydifferentcoolingsystems,comparedtomachinedmolds.Inaddition,theproductiontechniquecanalsohavean
6、effect;forinstance,itisoftenreportedthat,forthesakeofsimplicity,aprototypemoldisfrequentlymachinedfromsolidstockwiththeaidofthelatesttechnologysuchascomputer-aided(CAD)andcomputer-integratedmanufacturing(CIM).Incontrasttothepreviouslyusedmethodsbasedontheuseofpat
7、terns,theuseofCADandCAMoftenrepresentsthemoreeconomicalsolutiontoday,notonlybecausethisproductioncapabilityisavailablepin-housebutalsobecausewithanyothertechniqueanorderwouldhavetobeplacedwithanoutsidesupplier.Overall,althoughhigh-gradematerialsareoftenused,asaru
8、lestandardmaterialsareusedinmoldmaking.New,state-of-theart(high-performance)materials,suchasceramics,forinstance,arealmostcompletelyabsent.Thismayberelatedtoth
