MSA培训讲义

1TD.S.QM-24E.01ShanghaiJuly2005MeasurementSystemAnalysis(MSA)QualitySatisfyMSA2TD.S.QM-24E.01July2005ShanghaiTopicBasicconceptofmeasurementSystemAnalysisMeasurementSystemAnalysisApplication&DeterminationAttributemeasurementsystemanalysisQ&A3TD.S.QM-24E.01ShanghaiJuly2005SomebasicallyconceptforMSAMSA4TD.S.QM-24E.01July2005Shanghai•Measurement•MeasurementTools•MeasurementSystemMSA5TD.S.QM-24E.01July2005ShanghaiBias:Differencebetweenmeanofallmeasurementsandthereferencevalue.Referencevaluecanbesetupbythemeanofmeasurementswithahigherqualitymeasurementsystem.MSA6TD.S.QM-24E.01July2005ShanghaiDifferentmeanvaluesshowsdifferentresultsAnalysisforsystematicfailure:•BiasduetoOPERATER:Differentpersongetdifferentresults.•BiasduetoEQUIPMENT:Differentequipmentsshowsdifferentresults.MSA7TD.S.QM-24E.01July2005ShanghaiStability:Variationofameasuringsystembymeasuringthesamefeatureoveraperiodoftime.MSA8TD.S.QM-24E.01July2005Shanghai•Linearity:Differencebetweenthemeasuredvalueandthereferencevaluewhenusingonemeasurementinstrumentovertheexpectedcharacteristicprocesswindow.MSA9TD.S.QM-24E.01July2005Shanghai•Repeatability:Variationofthemeasurementresults,ifthesameoperatorismeasuringthesamepart(s)severaltimes.MSA10TD.S.QM-24E.01July2005Shanghai•Reproducibility:Variationofthemeansofthemeasurementresults,ifdifferentoperatorsmeasurethesamepart(s)withthethesamemeasurementequipmentseveraltimes.MSA11TD.S.QM-24E.01July2005ShanghaiGageR&R(repeatabilityandreproducibility)：AppliedintotalmeasurementsystemVariableAttribute12TD.S.QM-24E.01ShanghaiJuly2005MeasurementSystemAnalysisApplication&DeterminationMSA13TD.S.QM-24E.01July2005ShanghaiWhentouseitQualificationfortheequipmentComparisonbetweendifferentequipmentsConfirmationforthesuspiciousequipmentComparisonoftheequipmentbeforeandafterfixingitChangethemainpartsontheequipmentClassifythemeasurementequipmentNewproductspecificationMSA14TD.S.QM-24E.01July2005ShanghaiObtainasampleandestablishitsreferencevaluerelativetoatraceablestandard.Haveasingleappraisermeasurethesamplen=10timesinthenormalmanner.Computetheaverageofthenreadings.Bias=average–referencevalueIndependentSampleMethodMSA15TD.S.QM-24E.01July2005ShanghaiComputetherepeatabilitystandarddeviationwhered2*istakenfromAppendix，numberofsubgroups(g)＝1，subgroupsize(m)＝nDeterminethetstatisticforthebias:Biasisacceptableatthealevelifzerofallswithinthe1-aconfidenceboundsaroundthebiasvalue:21d)min()(maxxixinXiXrnin/bbrBiast＝)]t(d[0)]t(d[2/a1v*2b22/a1v*2b2－，－，＋－dBiasdBias2/a1vt－，WheretistakenfromAppendixMSA16TD.S.QM-24E.01July2005Shanghai案例Referencevalue＝6.0Bias15.8-0.225.7-0.335.9-0.145.9-0.156.00.066.10.176.00.086.10.196.40.4106.30.3116.00.0126.10.1136.20.2145.6-0.4156.00.0nMeasuredvalue156.00670.225140.05813rbXReferenceValue＝6.00,a=0.05,g=1,d2*=3.35TStatisticdfSignificanttvalue(2-tailed)Bias95%ConfidenceintervaloftheBiasLowerUpperMeasuredValue0.115310.82.2060.0067-1.11850.1319Conclusion:Sincezerofallswithintheconfidenceintervalofthebias(-0.1185,0.1319),theengineercanassumethatthemeasurementbiasisacceptableassumingthattheactualusewillnotintroduceadditionalsourceofvariation.MSA17TD.S.QM-24E.01July2005ShanghaiMSA18TD.S.QM-24E.01July2005ShanghaiFillMSA19TD.S.QM-24E.01July2005ShanghaiMSA20TD.S.QM-24E.01July2005ShanghaiMSA21TD.S.QM-24E.01July2005ShanghaiAnalysisofBiasstudyIfthebiasisstatisticallynon-zero,lookforthesepossiblecauses:•Errorinmasterorreferencevalue.Checkmasterprocedure.•Worninstrument.Thiscanshowupinthestabilityanalysisandwillsuggestthemaintenanceorrefurbishmentschedule.•Instrumentmadetowrongdimension.•Instrumentmeasuringthewrongcharacteristic.•Instrumentnotcalibratedproperly.Reviewcalibrationprocedure.•Instrumentusedimproperlybyappraiser,Reviewmeasurementinstructions.•Instrumentcorrectionalgorithmincorrect.MSA22TD.S.QM-24E.01July2005ShanghaiThesystemrecommendedMethod:•Onesampletosetupreferencevalue•Testthestandard3to5timesperiodically(daily,weekly)•DoX-barorX-Schartwithtime•Computethecontrolrange,evaluatethefailureandunstability•ComputetheSTD,comparewiththedeviationintheprocesstoevaluatethestabilityofthemeasurementsystemMSA23TD.S.QM-24E.01July2005ShanghaiJudgeaccordingtothechartsOutofcontrolRegulation1.Onepointoutofcontrolrange2.Continual9pointonthesamesideofthereferencevalue3.Continual6pointascendordescend4.Continual14pointascendordescendbyturns5.2pointsinthecontinual3pointsareoutthe2σline6.4pointsinthecontinual5pointsareoutthe1σline7.Continual15pointsintherangeof1σline8.Nopointinthecontinual8pointsisintherangeof1σlineMSA24TD.S.QM-24E.01July2005ShanghaiMSA25TD.S.QM-24E.01July2005ShanghaiMSA26TD.S.QM-24E.01July2005ShanghaiLinearityGuide•Selectg=5partswhosemeasurements,duetoprocessvariation,covertheoperationrangeofthegage•Haveeachpartmeasuredbylayoutinspectiontodetermineitsreferencevalueandtoconfirmthattheoperatingrangeofthesubjectgageisuncompressed.•Haveeachpartmeasuredm=10timesonthesubjectsgagebyoneoftheoperatorswhosenormallyusethegage.•Calculatethepartbiasforeachmeasurementandthebiasaverageforeachpart:•Plottheindivid