VW50093-EN-2012-07

GroupStandardVW50093Issue2012-07Class.No.:A6600Descriptors:cast,casting,lightmetalcast,pore,porosityPorosityofCastingsRequirementsPrefaceThisStandardsupersedesVolkswagenStandardVW50097Porosityofmetalcastings(VDGP201)(VDG=AssociationofGermanFoundryExperts–Germanabbreviation)PreviousissuesVW50097:2002-12,2007-07ChangesThefollowingchangeshavebeenmadecomparedwithVW50097:2007-07:–ApplicationasperVDGspecificationP202ContentsPageScope.........................................................................................................................2Definitions..................................................................................................................2Designation................................................................................................................2Explanationofthedesignationsystem.......................................................................2DeviationsfromandsupplementstoVDGspecificationP202...................................5Gradingofporosityspecificationsindrawings...........................................................6Requirements.............................................................................................................6Deliveryofcomponents..............................................................................................6Definitionofporosity...................................................................................................6Testingofporosity......................................................................................................7Recourseclaims.........................................................................................................7Applicabledocuments................................................................................................71233.13.23.344.14.2567VerifythatyouhavethelatestissueoftheStandardbeforerelyingonit.ThiselectronicallygeneratedStandardisauthenticandvalidwithoutsignature.TheEnglishtranslationisbelievedtobeaccurate.Incaseofdiscrepancies,theGermanversionisaloneauthoritativeandcontrolling.Numericalnotationacc.toISO/IECDirectives,Part2.Page1of7TechnicalresponsibilityStandardsDepartmentGQL-LM/1HannesWendtTel.:[phone]GQL-LDr.StephanEisenbergEKDV/4GabrielaBochynekEKDVTel.:[phone]ManfredTerlindenAllrightsreserved.NopartofthisdocumentmaybeprovidedtothirdpartiesorreproducedwithoutthepriorconsentoftheStandardsDepartmentofaVolkswagenGroupmember.©VolkswagenAktiengesellschaftVWNORM-2012-05iPage2VW50093:2012-07ScopeThisStandarddefinestherequirementsfortheporosityofcastingsregardlessofthecastingproc‐essused.DefinitionsDefinitionsasperVW50099.Surfacetowhichaporosityspecificationandtheevaluationrelates(cor‐respondingtoVDGP202)Generatingaflat,rectangularsurfacebyunfoldingtheinnersurfaceofahollowcylinder.DesignationTheunderlyingdesignationsystemandthedefinitionofthereferencesurfacescorrespondtotheBDGguideline(VDGspecification)VDGP202.Detailsonthedesignationsystemcanbeobtainedfromthespecification.DeviationsfromandsupplementstotheprovisionssetforthinthespecificationarelistedinthisStandardinsection3.2.Thepermissibleporosityofacastingisenteredintherespectivefinishedpartdrawing.ExplanationofthedesignationsystemThedesignationsystemoftheporositiesiscomposedofthefollowingparametersaspertheVDGspecificationVDGP202:–[Rz]–Roughnessofthereferencesurface:[Rz]isspecifiedinμm.Iftheroughnessinformationismissing,[Rz]=0appliesautomatically.Thiscorrespondstoametallographicallypolishedmicrosection.–[%]–Porecontent:Theporecontentisdefinedasthemaximumpermissibleporevolumeinpercentfortheagreedreferencesurfaces.–[∅]–Porediameter/porelength:Themaximumpermissibleporediameterisspecifiedinmm.–[A]–Distancebetweenadjacentpores:Theminimumdistancetobeadheredtobetweentwoadjacentporesisdescribedwiththispa‐rameter.Thedistancespecification[A]isanintegerfactorwithwhichthediameterofthesmalleroftwoadjacentporesismultipliedandtheminimumdistanceiscalculated.–[U]–Disregardedpores:Thevalue[U]indicatesuptowhichdiameterporesaredisregardedinthereferencesurfaceevaluation.–[Z]–Numberofpores:Thisparameterindicatesthemaximumpermissiblenumberofindividualporesperreferencesurfaceasanintegervalue.Poreaccumulationsaretreatedasindividualporeshere.–[H],[HR],or[HK]–Poreaccumulations:12Referencesurface:Unfoldrule:33.1Page3VW50093:2012-07Aporeaccumulationispresentwherethedistancebetweentwoadjacentporesislessthanthediameterofthesmallerpore.–[H]–(withoutsubscript)referstoporeaccumulationsintheentirereferencesurface–[HR]–referstoporeaccumulationsinthereferencesurfaceedgearea(outerthirdofwall)–[HK]–referstoporeaccumulationsinthereferencesurfacecorearea(innerthirdofwall)Thevaluefor[H],[HR]and[HK]canhavethefollowingbinaryvalues:–0=poreaccumulationsimpermissible–1=poreaccumulationspermissibleIfamaximumporediameterisspecifiedinadditiontotheporeaccumulation,theporeaccu‐mulationsaretreatedasindividualpores.Thatis,poreaccumulationswithdiametersthatex‐ceedthemaximumpermissibleindividualporediameterarenotpermissible.–[N],[NR],or[