質(zhì)量管理七大手法--wurooney-資料下載頁
2025-01-19 00:57本頁面
【正文】 ding on main airport per day Once wrong landing on main airport per 5 years 20,000 wrong prescription per year 68 wrong prescription per year 7 hours power cut per month 1 hour power cut per 34 years Which kind of control chart to choose? How to choose control chart? Total Size Attribute Characteristic CL Property XRm Chart Sample Size Unit Size c Chart u Chart np Chart p Chart Sample Size x – R Chart x – σ Chart x – R Chart Variables Attributes 1 Unit Defectives Defects Stable Vary fixed Vary x x n10 10≤n≤25 Implement procedure ? 1. Collect data。 Generally data should be ≥100. ? 2. Group the data。 Group into 25 groups, 5data/group. ? 3. Count x mean and total x mean. x=(x1+x2+……+xn)/n x=∑xi/n Implement procedure ? 4. Count range (R) of each group and mean of range (R)。 Ri=xmax – xmin。 R=∑Ri/n ? 5. Count UCL, CL and LCL. x Chart: CL=x。 UCL=x+A2R。 LCL=xA2R R Chart: CL=R。 UCL=D4R。 LCL=D3R Implement procedure n 2 3 4 5 6 7 8 9 10 D4 D3 0 0 0 0 0 A2 6. Draw control line。 then plot the dot and draw control chart. 56 61 64 62 58 59 61 62 60 60 58 62 62 62 64 64 60 60 56 60 63 59 59 63 59 57 64 61 61 61 59 62 62 61 60 57 55 63 60 61 57 56 63 60 61 58 62 60 58 61 58 61 60 60 56 58 61 63 60 60 62 62 61 58 63 58 60 57 59 61 61 61 61 62 61 63 59 63 56 58 59 58 60 60 62 57 59 59 60 62 62 60 62 57 59 58 58 62 58 62 61 62 60 59 64 56 63 61 61 60 60 58 60 60 60 64 59 60 61 60 61 61 60 56 61 Example: collect 100 data from production。 Count the correlative value and draw x R chart. S a m p l eSample Mean2 52 32 11 91 71 51 31 1975316 3 . 06 1 . 56 0 . 05 8 . 55 7 . 0__X = 6 0 . 1 5U C L = 6 3 . 0 8L C L = 5 7 . 2 2S a m p l eSample Range2 52 32 11 91 71 51 31 1975311 0 . 07 . 55 . 02 . 50 . 0_R = 5 . 0 8U C L = 1 0 . 7 4L C L = 0X b a r R C h a r t Implement procedure ? 7. Analyze the control chart。 If process is stable, count Cpk to see if it plies with specification。 If not stable, analyze the reason and take corrective action. 謝謝觀看 /歡迎下載 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
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