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1、ProcessCapability(Cp/Cpk/Pp/Ppk)GlobalTrainingMaterialCreator:GlobalMechanicsProcessManagerFunction:MechanicsApprover:GaryBradley/GlobalProcessTeamDocumentID:DMT00018-ENVersion/Status:V.1.0/ApprovedLocation:Notes:\…NMPDOCMANR4PCPPCProcessLibraryDocManChangeHistory:IssueDateHand
2、ledByComments1.021stDec’01JimChristy&S?renLundsfrydApprovedforGlobalUseNOTE–Allcommentsandimprovementsshouldbeaddressedtothecreatorofthisdocument.ContentsSectionHeading/DescriptionPage1Variation,TolerancesandDimensionalControl42Population,SampleandNormalDistribution153CpandCpkConcep
3、t284UseoftheNMPDataCollectionSpreadsheet445ConfidenceofCpk52ProcessCapability-EvaluatingManufacturingVariationAcknowledgementsBennyMatthiassen(NMPCMT,Copenhagen,Denmark)FrankAdler(NMPAlliance,Dallas,USA)JoniLaakso(NMPR&D,Salo,Finland)JimChristy(NMPSRC,Southwood,UK)Section1Variation,
4、TolerancesandDimensionalControlTwoTypesofProductCharacteristicsVariable:Acharacteristicmeasuredinphysicalunits,e.g.millimetres,volts,amps,decibelandseconds.ONOFFAttribute:Acharacteristicthatbycomparisontosomestandardisjudged“good”or“bad”,e.g.freefromscratches(visualquality).Inthistr
5、ainingwedealwithvariablesonlyTheSourcesofProcess/SystemVariationMethodsOperatorsCustomerSatisfactionMaterialEnvironmentEquipmentProcessTwoTypesofProcessesAllprocesseshave:Natural(random)variability =>duetocommoncausesStableProcess:Aprocessinwhichvariationinoutcomesarisesonlyfromcomm
6、oncausesUnstableProcess:AprocessinwhichvariationisaresultofbothcommonandspecialcausesUSLLSLnominalvalueDefectUSLLSLnominalvalueUnnaturalvariability=>duetospecialcausesShewhart(1931)TheTwoCausesofVariationCommonCauses:Causesthatareimplementedintheprocessduetothedesignoftheprocess,and
7、affectalloutcomesoftheprocessIdentifyingthesetypesofcausesrequiresmethodssuchasDesignofExperiment(DOE),etc.SpecialCauses:Causesthatarenotpresentintheprocessallthetimeanddonotaffectalloutcomes,butarisebecauseofspecificcircumstancesSpecialcausescanbeidentifiedusingStatisticalProcessCo
8、ntrol(SPC)USLLSLNom
