【正文】 p . M o r e c o n v e n i e n t t o p l o t t h a n p c h a r t .S u b g r o u p s i z e m u s t b e c o n s t a n t .N o t e f f e c t i v e w h e n d e f e c t l e v e l i s l o w 。 a l t e r n a t i v e s s h o u l d b e c o n s i d e r e d .N u m b e r o f D e f e c t s p e r S u b g r o u p ( c ) M o n i t o r t h e n u m b e r o f d e f e c t s i n e a c h s u b g r o u p .U s e d t o m o n i t o r t h e n u m b e r o f d e f e c t s i n a u n i t .S u b g r o u p s i z e i s o n e u n i t t h a t c o u l d h a v e s e v e r a l d e f e c t s .S u b g r o u p s i z e m u s t b e c o n s t a n t .I n e f f e c t i v e w h e n d e f e c t l e v e l i s l o w 。6Sigma Training Statistical Technique to 6Sigma Quality 1 6Sigma Training ABOUT INSTRUCTOR Current position : Sr. Officer, LCM Eng. Dept MPhif.(EE), BEng(Hons) Eng. Past working experience: HKUST: To fabricate OLED and design the related driving cicruits. CityU: To fabricate Polymeric Opto Waveguides Philips: To develop LCM including B/W, Color STN, TFT and PLED Solomon Systech: To develop the driver IC for B/W, Color STN, TFT and PDA products. 2 6Sigma Training COURSE ABSTRACT This course is to introduce the ways of Process Control System targeting to 6sigma Quality in the manufacturing areas. The benchmark of Six Sigma will be shared during the course. In order to achieve it, series of measurement system capabilities, performance metrics and process control methodology will be discussed. 3 6Sigma Training COURSE OBJECTIVES Participants will learn : * What is six Sigma * Control Planning and Methodology * Measurement system capability * Process Capability Metrics * Continuous Process Improvement 4 6Sigma Training Traditional Process Capability * % of the total area within spec. limits. Defect rate will be 2,700 PPM. * Only % of the area under the curve and defect rate is 66,000PPM. 5 6Sigma Training Six Sigma Capability * Defect rate PPM * Defect rate PPM 6 6Sigma Training ? Output Variables Manage the outputs. A Traditional View Sales Growth Market Share Profitability 7 6Sigma Training ? Output Variables ? Input Variables Manage the inputs。 a l t e r n a t i v e s s h o u l d b e c o n s i d e r e d .A v e r a g e N u m b e r o f D e f e c t s p e r U n i t ( u )M o n i t o r t h e a v e r a g e n u m b e r o f d e f e c t s i n a u n i t .U s e d t o m o n i t o r t h e a v e r a g e n u m b e r o f d e f e c t s i n a u n i t .S u b g r o u p i n c l u d e s s e v e r a l u n i t a n d t h e s i z e m a y v a r y .C o n t r o l l i m i t s m u s t b e c a l c u l a t e d i n d i v i d u a l l y f o r e a c h s u b g r o u p i f s u b g r o u p s i z e v a r i e s . A l t e r n a t i v e s s h o u l d b e c o n s i d e r e d w h e n d e f e c t l e v e l i s l o w .35 6Sigma Training Variable Control C H A R T T Y P E P U R P O S E U S A G ES U B G R O U P S I Z ER E M A R K SA V E R A G E( X b a r )M o n i t o r t h e a v e r a g e o f a p r o c e s s o r p r o d u c t c h a r a c t e r i s t i c a c r o s s t i m e .M o d e r a t e t o h i g h v o l u m e c o n t i n u o u s p r o d u c t i o n w h e n a s a m p l e o f m o r e t h a n 3 u n i t s c a n b e s e l e c t e d e v e r y f e w h o u r s .n 3 I n s e n s i t i v e t o s h i f t s s m a l l e r t h a n 2 s i g n m a s w h e n n = 4 t o 6 . D o n o t u s e r u n t e s t s i f d a t a i s a u t o c o r r e l a t e d .R A N G E( R )M o n i t o r t h e v a r i a b i l i t y o f a p r o c e s s o r p r o d u c t c h a r a c t e r i s t i c a c r o s s t i m e .U s e d w i t h a X b a r c h a r t w h e n s a m p l e s i z e i s 1 0 o r s m a l l e r .3 n 1 1 S a m p l i n g d i s t r i b u t i o n i s n o t s y m m e t r i c . D o n o t u s e r u n t e s t s . I n s e n s i t i v e t o s m a l l s h i f t s .S T A N D A R D D E V I A T I O N( S )M o n i t o r t h e v a r i a b i l i t y o f a p r o c e s s o r p r o d u c t c h a r a c t e r i s t i c a c r o s s t i m e .U s e d t o g e t h e r w i t h a X b a r c h a r t s w h e n s a m p l e s i z e i s m o r e t h a n 1 0 .n 1 0 I n c r e a s e d s e n s i t i v i t y d u e t o i n c r e a s e d s a m p l e s i z e . R e c o m m e n d e d w h e n t i g h t e r c o n t r o l o f a p r o c e s s i s n e c e s s a r y a n d / o r w h e n s a m p l i n g c o s t i s n o t a f a c t o r . D o n o t u s e r u n t e s t s .Z B A R W S i m i l a r t o X b a r R c h a r t s T h e s e a r e s t a n d a r d X b a r R c h a r t s , u s e d t o m o n i t o r t h e s a m e c h a r a c t e r i s t i c o f s e v e r a l s i m i l a r , b u t n o t i d e n t i c a l , p r o d u c t s .3 n 1 1