SC基本認(rèn)識(shí)培訓(xùn)教材英文

StatisticProcessControl

&

IndexofProcessCapability

JocelynChenRA/QRAQRATrainingCourse---

7_Jun1WS

ES

CS

MPT1T2…Tn

MPProcessPerformanceProcessCapabilityTotalDimensionMeasurementCriticalDimensionPpkvalue“*”“p”NewProductQualificationFlowProcessDimensionCpkvalue“p”SPC7_Jun2Ppk與Cpk之差異PpkThe6rangeofaprocess’stotalvariation,whereisusuallyestimatedbythesamplestandarddeviation--Thisisthevariationduetobothcommonandspecialcause.CpkThe6rangeofaprocess’sinherentvariation,forstatisticallystableprocessesonly,whereisusuallyestimatedby--Thatportionofprocessvariationduetocommoncausesonly.7_Jun3Accuracy&Precision7_Jun4ProcessCapabilityIndexesCapabilityofAccuracy7_Jun5評(píng)估產(chǎn)品製程平均與規(guī)格中心之偏移量製程偏移越大,Ca值越大Ca值

>0時(shí),代表製程平均偏上限=0時(shí),代表製程平均與規(guī)格中心一致<0時(shí),代表製程平均偏下限改善方向(1)調(diào)整模具,製程參數(shù),材料等以達(dá)到規(guī)格中心值(2)與客戶討論變更規(guī)格中心值,但需考慮組裝性問題(3)與客戶討論變更規(guī)格公差,但需考慮組裝性問題-允差設(shè)計(jì),決定最適之規(guī)格公差Ca意義說明AgradeBgradeCgradeDgrade7_Jun6ProcessCapabilityIndexesCapabilityofPrecision7_Jun77_Jun8Cp意義說明評(píng)估產(chǎn)品製程變異量(製程穩(wěn)定狀況)製程變異越大,Cp值越小Cp值均為一正值改善方向(1)調(diào)整模具,製程參數(shù),材料等以降低製程變異(2)與客戶討論變更規(guī)格公差,但需考慮組裝性問題AgradeBgradeCgradeDgrade7_Jun9ProcessCapabilityIndexesOne-sidedspecificationtolerancesTwo-sidedsymmetricalspecificationtolerancesTwo-sidedspecificationtolerances(includedsymmetricalandunsymmetrical)7_Jun10Cpk意意義義說明明評(píng)估產(chǎn)產(chǎn)品製製程精精準(zhǔn)度度的綜綜合指指標(biāo)Cpk值值<0代代表製製程平平均已已偏移移超出出規(guī)格格上限限或規(guī)規(guī)格下下限>1.0代代表製製程以以達(dá)到到3的的水準(zhǔn)準(zhǔn)>1.33代代表製製程以以達(dá)到到4的的水準(zhǔn)準(zhǔn)改善方方向(1)調(diào)整整模具具,製製程程參數(shù)數(shù),材材料料等以以降低低製程程變異異(2)分別別觀察察Ca值與與Cp值,就就不足足的部部份改改善.通通常先先求穩(wěn)穩(wěn)定製製程(提高高Cp值),再再求求減少少偏移移量(降降低Ca值值)7_Jun11ProcessCapability7_Jun12謝謝觀觀看/歡迎下下載BYFAITHIMEANA