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1、technicalnoteonthecharacterizationofelectroformednickelshellsfortheirapplicationtoinjectionmoldsaUniversidaddeLasPalmasdeGranCanaria,DepartamentodeIngenieriaMccanica,SpainAbstractThetechniquesofrapidprototypingandrapidtoolinghavebeenwidelydevelopedduringthelastyears.Inthisarticle,elec
2、troformingasaproceduretomakecoresforvplasticsinjectionmoldsisanalysed.ShellsareobtainedfrommodelsmanufacturedthroughrapidprototypingusingtheFDMsystem.Themainobjectiveistoanalyzethemechanicalfeaturesofelectrofbrmednickelshells,studyingdifferentaspectsrelatedtotheirmetallographicstructu
3、re,hardness,internalstressesandpossiblefailures,byrelatingthesefeaturestotheparametersofproductionoftheshellswithanelectroformingequipment.Finallyacorewastestedinaninjectionmold.Keywords:Electroplating;Electroforming;Microstmcture;Nickel■1.IntroductionOneofthemostimportantchallengeswi
4、thwhichmodemindustrycomesacrossistoofYertheconsumerbetterproductswithoutstandingvarietyandtimevariability(newdesigns).Forthisreason,modemindustrymustbemoreandmorecompetitiveandithastoproducewithacceptablecosts.Thereisnodoubtthatcombiningthetimevariableandthequalityvariableisnoteasybec
5、ausetheyfrequentlyconditiononeanother;thetechnologicaladvancesintheproductivesystemsaregoingtopermitthatcombinationtobemoreefficientandfeasibleinawaythat,forexample,ifitisobservedtheevolutionofthesystemsandtechniquesofplasticsinjection,wearriveattheconclusionthat,infact,ittakeslessand
6、lesstimetoputanewproductonthemarketandwithhigherlevelsofquality.Themanufacturingtechnologyofrapidtoolingis,inthisfield,oneofthosetechnologicaladvancesthatmakespossibletheimprovementsintheprocessesofdesigningandmanufacturinginjectedparts.Rapidtoolingtechniquesarebasicallycomposedofacol
7、lectionofproceduresthataregoingtoallowustoobtainamoldofpIcisticparts,insmallormediumseries,inashortperiodoftimeandwithacceptableaccuracylevels・Theirapplicationisnotonlyincludedinthefieldofmakingplasticinjectedpieces[1],[2]and£3],however,itistruethatitiswheretheyhavedevelopedmoreandwhe
8、rethe
