搜索
PorosityDeterminationasperVW50093ContentsPageScope.........................................................................................................................2Definitions..................................................................................................................2Aim.............................................................................................................................2Description.................................................................................................................2Testprocedures.........................................................................................................2Specificationofreferenceareas.................................................................................2Permissiblereferenceareageometries.....................................................................2Selection,size,andadjustmentofthereferenceareas.............................................3Positionofthereferencearea....................................................................................6Selectionofthesectionplane....................................................................................6Qualityofthereferenceareastobeevaluated..........................................................6Qualityofametallographicmicrosection–[Rz]=0...................................................6Qualityofotherreferencesurfacescreatedbycuts–[Rz]0..................................6Qualityofrawsurfacesorsurfacesmachinedasperthedrawing.............................7Evaluationofreferencesurfaces................................................................................7Evaluationofthereferenceareas..............................................................................8Evaluationoftheporousarea....................................................................................8Evaluationofporediametersanddistances..............................................................9Resultoftheporositytest...........................................................................................9Exampleoftheporositytest.......................................................................................9Applicabledocuments..............................................................................................10..................................................................................................................................11Porositytestsonmetallographicmicrosections–problemsanderrorsduringspecimenpreparationandevaluation......................................................................11Porositydeterminationonametallographicpolishedmicrosection.........................13Representationofmicrosectionsofdifferentporosity..............................................19ComparisonofporositykeysasperVW50093andVW50097..............................22123455.15.1.15.1.25.1.35.25.35.3.15.3.25.3.35.45.55.5.15.5.25.65.76AppendixAA.1A.2A.3A.4GroupStandardPV6093Issue2012-07Class.No.:A660Descriptors:porosity,porositydetermination,porositytest,porositytestoncastings,casting,polymer,plastic,metalVerifythatyouhavethelatestissueoftheStandardbeforerelyingonit.ThiselectronicallygeneratedStandardisauthenticandvalidwithoutsignature.TheEnglishtranslationisbelievedtobeaccurate.Incaseofdiscrepancies,theGermanversionisaloneauthoritativeandcontrolling.Numericalnotationacc.toISO/IECDirectives,Part2.Page1of22TechnicalresponsibilityStandardsDepartmentGQL-LM/1HannesWendtTel.:+4953619-38956GQL-LDr.StephanEisenbergEKDV/4GabrielaBochynekEKDVTel.:+4953619-21698ManfredTerlindenConfidential.Allrightsreserved.NopartofthisdocumentmaybeprovidedtothirdpartiesorreproducedwithoutthepriorconsentoftheStandardsDepartmentofaVolkswagenGroupmember.ThisStandardisavailabletocontractingpartiessolelyviatheB2Bsupplierplatform©VolkswagenAktiengesellschaftVWNORM-2011-08gScopeThisstandardappliestometalcastingsorpolymerinjectionmoldedpartswhosedrawingsorappli‐cablestandardscontainporosityspecificationsasperVW50093Porosityofcastings;require‐ments.DefinitionsDefinitionsasperVW50099,VW50093,andspecificationVDGP202.Casting:Apartmanufacturedbycreativeformingusinganycastingorinjectionmoldingprocedure.Comparisondiameter:DiameterofacircleenclosingtheporesPorositykey:PorosityspecificationsareencodedasperVW50093(basedontheVDGspecificationP202).AimTheaimofthisTestSpecification(PV)istotesttheporosityofthecastingwithregardtoexistingdrawingspecifications(inconformitywithVW50093).DescriptionDrawingnotesasperVW50093.TestproceduresThespecificationsincomponentdrawings,PerformanceSpecifications,and/orapplicablestandardsarerelevantforperformingthetests.Theporosityspecificationsofthefinishedpartdrawingtakepriorityhere.SpecificationofreferenceareasThespecificationsinallporekeysrefertoaso-calledreferencearea.Theporekeygivesthespe‐cificationsfortheporousareathatmustbeobserved,themaximumporesize,thenumberofpores,theminimumdistancesfromeachother,andthepermissibleporear