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1、ProcessCapability(Cp/Cpk/Pp/Ppk)GlobalTrainingMaterialCreator:GlobalMechanicsProcessManagerFunction:MechanicsApprover:GaryBradley/GlobalProcessTeamDocumentID:DMT00018-ENVersion/Status:V.1.0/ApprovedLocation:Notes:\…NMPDOCMANR4PCPPCProcessLibraryDocManChangeHistory:IssueDateHandledByComments1
2、.021stDec’01JimChristy&SørenLundsfrydApprovedforGlobalUseNOTE–Allcommentsandimprovementsshouldbeaddressedtothecreatorofthisdocument.ContentsSectionHeading/DescriptionPage1Variation,TolerancesandDimensionalControl42Population,SampleandNormalDistribution153CpandCpkConcept284UseoftheNMPDataCollectio
3、nSpreadsheet445ConfidenceofCpk52ProcessCapability-EvaluatingManufacturingVariationAcknowledgementsBennyMatthiassen(NMPCMT,Copenhagen,Denmark)FrankAdler(NMPAlliance,Dallas,USA)JoniLaakso(NMPR&D,Salo,Finland)JimChristy(NMPSRC,Southwood,UK)Section1Variation,TolerancesandDimensionalControlTwoTypesofP
4、roductCharacteristicsVariable:Acharacteristicmeasuredinphysicalunits,e.g.millimetres,volts,amps,decibelandseconds.ONOFFAttribute:Acharacteristicthatbycomparisontosomestandardisjudged“good”or“bad”,e.g.freefromscratches(visualquality).InthistrainingwedealwithvariablesonlyTheSourcesofProcess/SystemV
5、ariationMethodsOperatorsCustomerSatisfactionMaterialEnvironmentEquipmentProcessTwoTypesofProcessesAllprocesseshave:Natural(random)variability =>duetocommoncausesStableProcess:AprocessinwhichvariationinoutcomesarisesonlyfromcommoncausesUnstableProcess:Aprocessinwhichvariationisaresultofbothcommona
6、ndspecialcausesUSLLSLnominalvalueDefectUSLLSLnominalvalueUnnaturalvariability=>duetospecialcausesShewhart(1931)TheTwoCausesofVariationCommonCauses:Causesthatareimplementedintheprocessduetothedesignoftheprocess,andaffectalloutcomesoftheprocessIdentifyingthesetypesofcausesrequiresmethodssuchasDesig
7、nofExperiment(DOE),etc.SpecialCauses:Causesthatarenotpresentintheprocessallthetimeanddonotaffectalloutcomes,butarisebecauseofspecificcircumstancesSpecialcausescanbeidentifiedusingStatisticalProcessControl(SPC)USLLSLNom
