NOKIA-SPC教材.ppt

SPC NMP7 Pro StatisticalProcessControlSectionTopic Out of ControlCriteria ContinuousProcessImprovementwithVariationManagement USL LSL USL LSL 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 nominalvalue nominalvalue TheProblemofProcessOvercontrol 50 USL 55 LSL 45 50 55 45 50 55 45 Sample Sample 50 55 45 TheProblemofProcessOvercontrol Summary 50 55 45 LSL USL Processtamperingmaysubstantiallyincreasetheproductvariabilitysincetheprocessaverageisshiftedeachtimeanadjustmentismade CommonCauses Causesthatareimplementedintheprocessduetothedesignoftheprocess andaffectalloutcomesoftheprocess IdentifyingthesetypesofcausesrequiresDesignofExperiment DOE methods NMP7 Pro SpecialCauses Causesthatarenotpresentintheprocessallthetimeanddonotaffectalloutcomes butarisebecauseofspecificcircumstances SpecialcausescanbeidentifiedusingSPC Shewhart 1931 TheTwoCausesofVariation UnstableProcess Aprocessinwhichvariationisaresultofbothcommonandspecialcauses StableProcess Aprocessinwhichvariationinoutcomesarisesonlyfromcommoncauses TheTwoTypesofProcesses In Control and Out of Control Processes Time Target Target Target Target UCL LCL UCL LCL UCL LCL UCL LCL In Control and Out of Control Processes UCL LCL UCL LCL UCL LCL UCL LCL Asignalofaspecialcausesofvariation Isasystematicpatternofthecharacteristiccharted Hasalowprobabilityofoccurringwhentheprocessisincontrol DetectionofSpecialCauses SPC管制异常判定規則 1 規則 1點超過 3 范圍 P 0 0013 0 13 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma SPC管制异常判定規則 2 規則 連續3點中2點超過 2 范圍 P 0 001 0 1 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma SPC管制异常判定規則 3 規則 連續5點中4點超過 1 范圍 P average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma SPC管制异常判定規則 4 規則 連續8點在管制中心同側 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma P 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 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma SPC管制异常判定規則 6 規則 連續15點在 1 范圍 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma P SPC管制异常判定規則 7 規則 太多或太少的趨勢點 Thenumberofruns crossingtheaverageline shouldbeaboutone halfofthenumberofpointsonthecontrolchart average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma SPC管制异常判定規則 8 規則 連續8點無1點在 1 范圍 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average 3 sigma P SPC管制异常判定規則 9 規則 明顯呈周期性變化 average 3 sigma average 2 sigma average 1 sigma average average 1 sigma average 2 sigma average