SPC基本认识培训教材英文

1、Statistic Process Control &Index of Process Capability Jocelyn Chen RA / QRAQRA Training Course - 7_Jun1WSESCSMPT1T2TnMPProcess PerformanceProcess CapabilityTotal DimensionMeasurementCritical DimensionPpk value“*” “p”NewProductQualification FlowProcess DimensionCpk value“p”SPC7_Jun2Ppk與Cpk之差異PpkThe6

2、rangeofaprocessstotalvariation,whereisusuallyestimatedbythesamplestandarddeviation-Thisisthe variationduetobothcommonand specialcause.CpkThe6rangeofa processsinherentvariation, forstatistically stableprocessesonly,whereis usuallyestimatedby-Thatportionofprocess variationduetocommoncauses only.7_Jun3

3、Accuracy& Precision7_Jun4Process CapabilityIndexesCapability of Accuracy7_Jun5評估產品品製程平平均與規規格中心心之偏移移量製程偏移移越大, Ca值越大Ca值 0時,代表製程程平均偏偏上限= 0時,代表製程程平均與與規格中中心一致致 0時,代表製程程平均偏偏下限改善方向向(1)調整模具具,製程參數數,材料等以以達到規規格中心心值(2)與客戶討討論變更更規格中中心值,但需考慮慮組裝性性問題(3)與客戶討討論變更更規格公公差,但需考慮慮組裝性性問題-允差設計,決定最適適之規格格公差Ca意義說明明A gradeB grade

4、C gradeD grade7_Jun6Process CapabilityIndexesCapability of Precision7_Jun77_Jun8Cp意義說明明評估產品品製程變變異量(製程穩定定狀況)製程變異異越大, Cp值越小Cp值均為一一正值改善方向向(1)調整模具具,製程參數數,材料等以以降低製製程變異異(2)與客戶討討論變更更規格公公差,但需考慮慮組裝性性問題A gradeB gradeC gradeD grade7_Jun9Process CapabilityIndexesOne-sidedspecificationtolerancesTwo-sidedsymmetricalspecificationtolerancesTwo-sidedspecificationtolerances (includedsymmetricalandunsymmetrical)7_Jun10Cpk意義說明明評估產品品製程精精準度的的綜合指指標Cpk值 1.0代表製程程以達到到3的水準 1.33代表製程程以達到到4的水準改善方向向(1)調整模具具,製程參數數,材料等以以降低製製程變異異(2)分別觀察察Ca值與Cp值,就不足