SPC基本认识培训教材英文15265.pptx
Statistic Process Control&Index of Process Capability Jocelyn Chen RA/QRAQRA Training Course -7_Jun1WS ES CS MPT1 T2 Tn MPProcess PerformanceProcess CapabilityTotal DimensionMeasurementCritical DimensionPpk value“*”“p”New Product Qualification FlowProcess DimensionCpk value“p”SPC7_Jun2Ppk 與與 Cpk 之差異之差異PpkThe 6 range of a processs total variation,where is usually estimated by the sample standard deviation -This is the variation due to both common and special cause.CpkThe 6 range of a processs inherent variation,for statistically stable processes only,where is usually estimated by -That portion of process variation due to common causes only.7_Jun3Accuracy&Precision 7_Jun4Process Capability IndexesCapability of Accuracy7_Jun5評估產品製程平均與規格中心之偏移量評估產品製程平均與規格中心之偏移量製程偏移越大製程偏移越大,Ca值越大值越大Ca 值值 0 時時,代表製程平均偏上限代表製程平均偏上限 =0 時時,代表製程平均與規格中心一致代表製程平均與規格中心一致 0 時時,代表製程平均偏下限代表製程平均偏下限改善方向改善方向 (1)調整模具調整模具,製程參數製程參數,材料等以達到規格中心值材料等以達到規格中心值 (2)與客戶討論變更規格中心值與客戶討論變更規格中心值,但需考慮組裝性問題但需考慮組裝性問題 (3)與客戶討論變更規格公差與客戶討論變更規格公差,但需考慮組裝性問題但需考慮組裝性問題-允差設計允差設計,決定最適之規格公差決定最適之規格公差Ca 意義說明意義說明A gradeB gradeC gradeD grade7_Jun6Process Capability IndexesCapability of Precision7_Jun77_Jun8Cp 意義說明意義說明評估產品製程變異量(製程穩定狀況)製程變異越大,Cp值越小Cp 值均為一正值改善方向 (1)調整模具,製程參數,材料等以降低製程變異 (2)與客戶討論變更規格公差,但需考慮組裝性問題A gradeB gradeC gradeD grade7_Jun9Process Capability IndexesOne-sided specification tolerancesTwo-sided symmetrical specification tolerancesTwo-sided specification tolerances(included symmetrical and unsymmetrical)7_Jun10Cpk 意義說明意義說明評估產品製程精準度的綜合指標Cpk 值 1.0 代表製程以達到3 的水準 1.33代表製程以達到4 的水準改善方向 (1)調整模具,製程參數,材料等以降低製程變異 (2)分別觀察Ca值與Cp值,就不足的部份改善.通常先求穩定製程(提高Cp值),再求減少偏移量(降低Ca 值)7_Jun11Process Capability7_Jun12谢谢观看/欢迎下载BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES.BY FAITH I BY FAITH
