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1、TheInjectionMoldingTheIntroductionofMoldsThemoldisatthecoreofaplasticmanufacturingprocessbecauseitscavitygivesapartitsshape.Thismakesthemoldatleastascritical-andmanycasesmoreso-forthequalityoftheendproductas,forexample,theplasticitingunitorothercomponentsoftheprocessingeq
2、uipment.MoldMaterialDependingontheprocessingparametersforthevariousprocessingmethodsaswellasthelengthoftheproductionrun,thenumberoffinishedproductstobeproduced,moldsforplasticsprocessingmustsatisfyagreatvarietyofrequirements.Itisthereforenotsurprisingthatmoldscanbemadefro
3、maverybroadspectrumofmaterials,including-fromatechnicalstandpoint-suchexoticmaterialsaspapermatchedandplaster.However,becausemostprocessesrequirehighpressures,oftencombinedwithhightemperatures,metalsstillrepresentbyfarthemostimportantmaterialgroup,withsteelbeingthepredomi
4、nantmetal.Itisinterestinginthisregardthat,inmanycases,theselectionofthemoldmaterialisnotonlyaquestionofmaterialpropertiesandanoptimumprice-to-performanceratiobutalsothatthemethodsusedtoproducethemold,andthustheentiredesign,canbeinfluenced.Atypicalexamplecanbeseeninthechoi
5、cebetweencastmetalmolds,withtheirverydifferentcoolingsystems,comparedtomachinedmolds.Inaddition,theproductiontechniquecanalsohaveaneffect;forinstance,itisoftenreportedthat,forthesakeofsimplicity,aprototypemoldisfrequentlymachinedfromsolidstockwiththeaidofthelatesttechnolo
6、gysuchascomputer-aided(CAD)andcomputer-integratedmanufacturing(CIMS).Incontrasttothepreviouslyusedmethodsbasedontheuseofpatterns,theuseofCADandCAMoftenrepresentsthemoreeconomicalsolutiontoday,notonlybecausethisproductioncapabilityisavailablepin-housebutalsobecausewithanyo
7、thertechniqueanorderwouldhavetobeplacedwithanoutsidesupplie匚Overall,althoughhigh-gradematerialsareoftenused,asarulestandardmaterialsareusedinmoldmaking.New,state-of-theart(high-performance)materials,suchasceramics,forinstance,arealmostcompletelyabsent.Thismayberelatedtoth
8、efactthattheirdesirablecharacteristics,suchasconstantpropertiesuptoveryhightemperatures,arenotre
