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During normal production, take data from IPQC first article inspection record. If
Data is insufficient, shall accumulate to next month.
3.3 CPK計算Calculation of Cpk
Mass production lots. Calculate Cpk value from these three lots’ data. At least take
100 ea effective data from three lots.
3.2.2量產時每月從IPQC首件巡檢日報中隨機選取,如數據不足則順延至下月進行.
Corrective ac源自文库ion and 100% inspection .
.
4參考文件Reference
無None
5附件Appendix：
5.1 CPK form
5.2 Xbar-R管制圖(manual-chart) X bar –R control chart (manual-chart)
5.3 Xbar - R管制圖(auto-chart) X bar –R control chart (auto-chart)
For new product, the initial three mass production lots and during normal production,
Perform this procedure per QE provided Cpk request list to proceed Cpk study.
The selection of product/characteristics for Cpk study: Shall consider these factors – measurable,
Critical to customer usage, has great influence to next process, vulnerable characteristics .
CPK<1.0,不影嚮工能,外觀,并經工程/客戶認可,則依工程/客戶認可規格控制,否則
追查原因,採取措施,必要時全檢.
Cpk < 1.0, the actual product shall meet customer’s requirements in functionality
And external cosmetic, and shall be approved by Engineering/customer. If approved,
6發行與修訂: Publication and revision
本文件依【文件管理程序】進行編制、審核、核準、和發行,修訂時亦同。
This document shall initiate, review, approved and issued per “ Document Control Procedure”. The revision procedure will be the same.
3.2數據收集及選取Data collection and calculation
3.2.1新產品量產開始3批,每批生產時IPQC隨機抽樣35PCS量測數據, CPK取此3批的
量測數據來計算,至少應取100個有效數據.
For new product, IPQC shall randomly take 35 pcs/lot samples from the initial three
CPK>1.33,製程穩定,管制良好,可適當減量檢驗.
Cpk > 1.33, process is capable and under control. Can reduce inspection frequency.
1.33 > CPK>=1.0,製程不穩定,應改善製程,使達到1.33以上.
1.33 > Cpk >=1.0, process is incapable, shall improve Cpk to over 1.33.
Entry these data to Cpk calculating software, will get Cp, Cpk and Standard deviation.
3.4 CPK (制程能力)分析和判定
Cpk (Process Capability) analysis and judgement
1.目的Purpose：
分析制程能力,為改善制程提供依據.
To provide procedure for Process Capability study and perform process improvement.
2.範圍Scope：
2.1新產品量產開始3批及量產時每月依QE提供的CPK清單進行.
2.2客戶有要求時按客戶要求進行.
Per customer’s request, perform required Cpk study.
3.說明Description
3.1 CPK分析的產品/制程特性選定原則:能測定的產品或制程特性;與客戶使用及生產關系重大
的特性;對下工程影響較大的特性;經常出問題的特性.
Then product will be monitored by Engineering/customer recognized spec. for process
Control. Otherwise, shall investigate the root cause of lower Cpk, take required
3.3.1計算公式Formula
Cp =規格界限寬度( T )/(6*δ) Cpk=Spec. tolerance/6 x standard deviation.
Cpk = ( 1-k )*Cp. K = Ca = |1/2(TU+TL)-x| / (1/2(TU-TL)
3.3.2輸入數據至CPK軟件得到Cp, Cpk,及δ值.
