NOKIA-SPC教材.ppt

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1、SPCNMP7_Pro:StatisticalProcessControlSectionTopic:Out-of-ControlCriteriaContinuousProcessImprovementwithVariationManagementUSLLSLUSLLSL超管制界限問題發生原因分析制程改善呈趨勢變化問題發生原因分析改善及預防行動變異Defect變動管理及制程改善nominalvaluenominalvalueTheProblemofProcessOvercontrol50USL=55LSL=45

2、505545505545SampleSample505545TheProblemofProcessOvercontrol(Summary)505545LSLUSLProcesstamperingmaysubstantiallyincreasetheproductvariabilitysincetheprocessaverageisshiftedeachtimeanadjustmentismade.CommonCauses:Causesthatareimplementedintheprocessduetothedesignof

3、theprocess,andaffectalloutcomesoftheprocess.IdentifyingthesetypesofcausesrequiresDesignofExperiment(DOE)methods(NMP7_Pro).SpecialCauses:Causesthatarenotpresentintheprocessallthetimeanddonotaffectalloutcomes,butarisebecauseofspecificcircumstances.Specialcausescanbei

4、dentifiedusingSPC.Shewhart(1931)TheTwoCausesofVariationUnstableProcess:Aprocessinwhichvariationisaresultofbothcommonandspecialcauses.StableProcess:Aprocessinwhichvariationinoutcomesarisesonlyfromcommoncauses.TheTwoTypesofProcesses"In-Control"and"Out-of-Control"Proc

5、essesTimeTargetTargetTargetTargetUCLLCLUCLLCLUCLLCLUCLLCL"In-Control"and"Out-of-Control"ProcessesTargetTimeTargetTargetTargetUCLLCLUCLLCLUCLLCLUCLLCLAsignalofaspecialcausesofvariation:Isasystematicpatternofthecharacteristiccharted.Hasalowprobabilityofoccurringwhent

6、heprocessisincontrol.DetectionofSpecialCausesSPC管制异常判定規則(1.規則:1點超過±3σ范圍)P=0.0013(0.13%)average+3*sigmaaverage+2*sigmaaverage+1*sigmaaverageaverage-1*sigmaaverage-2*sigmaaverage-3*sigmaSPC管制异常判定規則(2.規則:連續3點中2點超過±2σ范圍)P=0.001(0.1%)average+3*sigmaaverage+2*sigmaaverag

7、e+1*sigmaaverageaverage-1*sigmaaverage-2*sigmaaverage-3*sigmaSPC管制异常判定規則(3.規則:連續5點中4點超過±1σ范圍)P=average+3*sigmaaverage+2*sigmaaverage+1*sigmaaverageaverage-1*sigmaaverage-2*sigmaaverage-3*sigmaSPC管制异常判定規則(4.規則:連續8點在管制中心同側)average+3*sigmaaverage+2*sigmaaverage+1*sigm

8、aaverageaverage-1*sigmaaverage-2*sigmaaverage-3*sigmaP=SPC管制异常判定規則(5.規則:連續7點呈上升或下降趨勢)average+3*sigmaaverage+2*sigmaaverage+1*sigmaaverageaverage-