【正文】 , RPN 125 may be a good threshold to use ie for RPN 125 = corrective action is needed. But there are exceptions 。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 51 Process FMEA vs Product DFMEA * PFMEA does not rely on product design changes to overe process weaknesses, but it does take into consideration a product?s design characteristics * DFMEA does not rely on process controls to overe design weaknesses, but it does take the technical/physical limitations of the manufacturing process (. the process capability) into consideration. Process step Purpose Piecepart or subassy Function Process FMEA Product FMEA H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 38 Detection (PFMEA) Rating Degree Description 1 Very High Process automatically detects failure 2 Control will almost certainly detect failure 3 High Control have good chance of detecting failure 4 5 Moderate Control may detect failure 6 7 Low Control have low chance of detecting failure 8 9 Very Low Control probably will not detect failure 10 Nil Control will not detect failure ~ Assume the failure has occur, assess the probability that the controls will detect the failure mode before shipping out H Philips CFT Asia Pacific Innovation amp。 wire spring Assembly process H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 17 FMEA for the Production Process Subject for Analysis: flow chart and scenario of the production process Focused on: manipulations of the operator wrong (deviations) material process equipment transport storage H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 6 QUALITY ENGINEERING TOOLS TOOLS 1 Design Review 2 7 QC Tools 3 New 7 QC Tools 4 Statistical Process Control 5 Design of Experiments 6 Quality Function Deployment 7 Failure Mode and Effects Analysis APPLICATION Design Quality Assurance Data analysis/Problemsolving Business Process Mgt, QFP Holding the improvement Quality breakthroughs Meeting customer requirement Foolproof Design amp。 processes H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 18 Failure mode RPN2 = SO2D2 Controls Cause 1 RPNn = SOnDn Controls Cause 1 Development of a Process FMEA : An Overview Process step Purpose RPN1 = SO1D1 Controls Cause 1 Effects Severity, S Occurrence, On Detection, Dn H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 24 S u b j e c t : No P r oc e s s s t e p / P ur po s e P ot e nt i a l Fa i l ur e M od eP ot e nt i a l E f f e c t on Fa i l ur eS P ot e nt i a l c a us e s on Fa i l ur eO C ur r e nt C on t r olD R P N1 M ou nt a c t ua t or a nd i ns t a l l s pr i ng c l i p = H ol d a c t ua t or i n pl a c e2 C ut LD G U , M ou nt LD G U t o l i ne pe n ho us i ng = A s s e m bl e LD G U3 M ou nt a nd s e c ur e f l e x a s s y = A s s e m bl e Fl e x A s s yFailure Mode and Effect Analysis Chart H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 39 S u b j e c t : No P r oc e s s s t e p / P ur po s e P ot e nt i a l Fa i l ur e M od eP ot e nt i a l E f f e c t on Fa i l ur eS P ot e nt i a l c a us e s on Fa i l ur eO C ur r e nt C on t r olD R P N1 M o u n t a c t u a t o r a n d i n s t a l l s p r i n g c l i p = H o l d a c t u a t o r i n p l a c eD i f f i c u l t y i n a s s e m b l i n g s p r i n g c l i p~ L o n g c y c l e t i m e 8 ~ H a n d l i n g r e q u i r e d t o o r i e n t a t e c l i p 8 ~ P r o d u c t i o n M o n i t o r i n g C h a r t , O p r s k i l l c h a r t42 C u t L D G U , M o u n t L D G U t o l i n e p e n h o u s i n g = A s s e m b l e L D G UL e n s a n d g r a t i n g c o n t a m i n a t i o n~ F a i l G r a t i n g A d j u s t m e n t8 ~ H a n d l i n g 4 ~ R e j e c t a t a d j u s t m e n t s t n1~ C u t t i n g m a c h i n e d i r t y3 ~ W e e k l y m a i n t e n a n c e43 M o u n t a n d s e c u r e f l e x a s s y = A s s e m b l e F l e x A s s yE S D L D G U d a m a g e b y c o n t a c t a f f e c t i n g l o n g / s h o r t t e r m r e l i a b i l i t y8 H a n d l i n g b y o p e r a t o r2 ~ R e j e c t a t a d j u s t m e n t s t n8Failure Mode and Effect Analysis Chart H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 52 Process FMEA vs Pr。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 41 ? Risk Priority Number : (RPN) = Severity x Occurrence x Detection = RPN = S x O x D 1 RPN 1000 In themselves , absolute RPN numbers have no significance. They are only for ranking the failure causes, for corrective actions H Philips CFT Asia Pacific Innovation amp。 Industrial Support CZB698000006| 2020年 7月 7日星期二 | 26 Step3 Establish purpose of each operation and the possible failure modes ? What is the purpose of the process step ? ? Which deviations are possible ? ( FAILURE MODE ) ? What is the effect of that deviation on the producibility? ( EFFECT ) ? What is the cause of that deviation ? ( CAUSE ) H Philips CFT Asia Pacific Innovation amp。 L D G U t o F l e x A s s y = C o n n e c t a c t u a t o r , L D G U a n d