SPCのCPK實戰(zhàn)篇

1、SPC及及CPK實實 戰(zhàn)戰(zhàn) 篇篇11六西格碼在控制中的應(yīng)用六西格碼在控制中的應(yīng)用廣義的六西格碼是一個完善的管理工具是品質(zhì)管理系統(tǒng)的一種說法單純的六西格碼控制應(yīng)用是一種質(zhì)量控制的目標請看以下說法正確與否? 我公司已經(jīng)實施了六西格碼管理? 我公司達到了六西格碼的要求? 通過六西格碼管理公司品質(zhì)上了一個臺階一六西格碼一六西格碼22六西格碼與不良率六西格碼與不良率: Kr 百分比(%) 百萬分缺點數(shù) 1r 2r 3r 4r 5r 6r 68.26 95.45 99.73 99.9937 99.999943 99.9999998 317400 45500 2700 63 0.57 0.002(規(guī)格中心不

2、偏移規(guī)格中心不偏移)常態(tài)分配常態(tài)分配規(guī)格下限規(guī)格下限規(guī)格上限規(guī)格上限-6r-5r-4r-3r-2r-1r+6r+1r+2r +3r +4r +5rX423 Kr 合格百分比(%) 百萬分缺點數(shù) 1r 2r 3r 4r 5r 6r 30.23 69.13 93.32 99.3790 99.97670 99.999660 697700 308700 66810 6210 233 3.4規(guī)格中心值往左、右移動規(guī)格中心值往左、右移動1.5r常態(tài)分配常態(tài)分配規(guī)格下限規(guī)格下限規(guī)格上限規(guī)格上限-6r-5r-4r-3r-2r-1r+6r+1r+2r +3r +4r +5rX1.5r1.5r434n3控制方式與

3、6控制方式的比較：5? ? ? ? ?兩個影響量 6二二SPC與與CPK1區(qū)別與聯(lián)系區(qū)別與聯(lián)系CPK判定短期的制程能力可以用來解析目前的制程能力或用來檢驗制程能力是否在管制狀況下SPK長期的制程能力主要用在制程管制上。兩者配合使用應(yīng)該做到短期=長期72影響量影響量-標準差標準差Sigma8樣173.673.672.076.576.872.076.873.673.673.673.673.670.470.472.0272.073.673.675.273.673.672.076.876.878.472.073.670.470.472.0 UCL UCLCLLCLLCL本376.875.272.076

4、.876.873.676.878.476.878.473.675.270.472.073.676.774.171.471.4測4 UCL UCLCLLCLLCL222.4 222.4 217.6 228.5 227.2 219.2 225.6 228.8 227.2230.4219.2 222.4211.2212.8217.66.62.60.00.074.174.172.576.275.773.175.276.375.776.873.174.170.470.972.5X=X=4.81.61.61.63.21.64.84.83.24.81.61.60.01.61.6R=R=X=R=1.960.6

5、90.85製 品名 稱TRX-7規(guī)格標準溫度時間群組數(shù)大小製 造部 門SMT期間49周上限 USL225803管制項目爐溫中心限CL22075總組數(shù)機 別回焊爐測溫板TRX-7-1實板測量單位&sec下限 LSL2157015測 定 者姜雲(yún)霞時時間間時 間 管 制日期 2004.11.29時間1110.838.4R時間74.12.6 R管制圖C P=預(yù)估不良率 (PPM)製程能力分析時間 Sigma=CPK=X圖R圖備注備注及原及原因追查因追查1時間的數(shù)據(jù)離散性較大Sigma=1.96因此要從測量儀器影響時間的設(shè)置來分析解決。時時間間X管缺制圖平均0.02.04.06.08.01234

6、56789101112131415UCLCLLCLR69717375777981123456789101112131415UCLCLLCLXUSLLSLSL實例實例(Sigma較大離散性問題較大離散性問題)3影響量影響量-中心偏移量中心偏移量10CPK實例分析實例分析(離散性較小中心偏移量影響離散性較小中心偏移量影響) 製 品R圖名 稱管制項目測量單位日期/時間批號1234567891011121314151617181920212223242515.8967樣10.1310.1350.1270.1270.1310.1350.1350.1270.1270.1310.1270.1310.1310

7、.1350.1270.1350.1310.1270.1380.1310.1310.1270.1310.1350.1270.241本20.1350.1310.1310.1240.1240.1310.1270.1310.1270.1350.1310.1240.1270.1310.1270.1270.1240.1240.1350.1240.1270.1270.1270.1310.131測30.130.1270.120.120.1240.1310.1270.1240.1240.1270.1310.1270.1240.1270.120.120.120.1240.1310.1270.1270.1240.1

8、20.1310.131定40.1270.1270.1240.1310.1270.1350.1310.120.120.1270.1270.1310.1270.1310.120.1240.1240.1270.1270.1310.130.1270.1240.120.124值50.1240.1310.1240.1270.120.1270.1240.1160.120.120.1240.1270.1240.1240.120.130.1240.1240.120.1270.1310.1270.1240.1270.1310.6440.6510.6260.6290.6260.6590.6440.6180.6180

9、.640.640.640.6330.6480.6140.6330.6230.6260.6510.640.6470.6320.6260.6440.6440.1290.130.1250.1260.1250.1320.1290.1240.1240.1280.1280.1280.1270.1296 0.1230.1270.1250.1250.130.1280.1290.1260.1250.1290.1290.0110.0080.0110.0110.0110.0080.0110.0150.0070.0150.0070.0070.0070.0110.0070.0150.0110.0030.0180.007

10、0.0040.0030.0110.0150.0070.1272R=0.0101中心偏移量為0.0072Sigma值為0.0024通過計算SPC的管制范圍為0.011可見控制范圍已經(jīng)相當小說明每次測量的數(shù)據(jù)都集中在一個區(qū)域波動很小。因此CPK值十分合理為1.812但管制上下限均在規(guī)格中心到規(guī)格上限的范圍內(nèi)且管制下限還沒有達到規(guī)格中心?？梢钥紤]調(diào)整規(guī)格并作進一步跟蹤。 R管制圖 Sigma= 0.0024CPK= 1.8112備註及原因追查: CP = 2.8242R 平平 均均X管制圖預(yù)估不良率 (PPM)製程能力分析 25合計量測數(shù)值的判定條件 USL 藍色1.67屬于制程能力充分的狀態(tài)下22

11、1.3計算管制上下限上管制界限:UCL= Xbar +3*Sigma=0.139832+3*0.00312=0.149192下管制界限:LCL= Xbar - 3*Sigma =0.139832-3*0.00312=0.1304722312345678910111213141516171819202122232425USL0.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.16UCL0.1490.1490.1490.1490.1490.1490.149

12、0.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.149SL0.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.14Xi0.1430.140.1420.140.1450.1430.140.140.1350.1410.1370.140.1330.140.1360.1440.1370.140.140.1430.1370.1420.14

13、30.1420.1352CL0.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.14LCL0.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.130LSL0.120.120.120.120.120.120.120.120.120.120.120.120.120.1

14、20.120.120.120.120.120.120.120.120.120.120.120.110.130.150.1712345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25USLUCLSLXiLCLLSLCL1.4管制圖241.5解析管制上下限上管制界限:UCL= 0.149192實際管制上限= 0.150 在實際解析中如果測量的點比較分散可以適當放寬解析上限再定期檢討縮緊管制上限到理論值。下管制界限:LCL= 0.130472實際管制下限= 0.130在實際解析中如果測量的點比較分散可以適當放寬解析下限再定期檢討縮緊管制下限到理論

15、值。252SPC管制 將CPK解析的管制上下限作為SPC的管制上下線 定時對生產(chǎn)制程進行量測這個時間可以是每天或每班 檢查每次的量測結(jié)果是否在管控范圍內(nèi) 量測點超出管控線需要立即檢討制程尋找出原因 定期(每月或每周)對近期的控制圖進行分析檢查是否有不收控制的趨勢(如周期變動連續(xù)7點連續(xù)11點等)。260.1250.1300.1350.1400.1450.1500.1551/11/21/31/41/51/61/71/81/91/101/111/121/131/141/151/16異常異常1/11/21/31/41/51/61/71/81/91/101/111/121/131/141/150.14

16、80.140.1480.1440.1370.140.1320.1480.1370.1350.1490.1440.1440.1440.1370.1440.1330.1220.140.1390.1360.1550.140.140.1370.1330.1330.1330.1280.1330.1420.1390.1520.140.1370.140.1290.1440.1330.1290.1370.1440.140.1530.1440.140.1370.140.140.1480.1230.1410.1430.1370.1560.1430.1400.1410.1370.1400.1370.1270.140

17、0.1410.1370.1530.0080.0070.0110.0150.0110.0150.010.0150.0070.0050.007Date/Shift14235XR2.1SPC管制圖272.2管制圖的難點 CPK解析時存在中心偏移量較大的情況 CPK解析時數(shù)據(jù)離散性較大Sigma較大 SPC管制時管制上下限太嚴導致經(jīng)常跑出管制線 量測點都在管制界限內(nèi)是否代表制程良好283SPC & CPK管制的步驟管制的步驟四個步驟3.1 CPK改進3.2 CPK解析3.3SPC管制及改進3.4PDCA293.1CPK改進-中心偏移量123456789101112131415161718192

18、02122232425USL0.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.170.17UCL0.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.149SL0.150.150.150.150.150.150.150.150.150.150.150.150.150.15

19、0.150.150.150.150.150.150.150.150.150.150.15Xi0.1430.140.1420.140.1450.1430.140.140.1350.1410.1370.140.1330.140.1360.1440.1370.140.140.1430.1370.1420.1430.1420.1352CL0.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.14LCL0.1300.1300.1300.1300.1300.1300

20、.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.130LSL0.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.130.150.1712345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25USLUCLSLXiLCLLSLCLSLCLCP=2.13675K=0

21、.5084CPK=1.05303.1CPK解析-消除中心偏移量0.110.130.150.1712345678910 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25USLUCLSLXiLCLLSLCL12345678910111213141516171819202122232425USL0.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.160.16UCL0.1490.1490.1490.1490.1490.1490.

22、1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.1490.149SL0.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.14Xi0.1430.140.1420.140.1450.1430.140.140.1350.1410.1370.140.1330.140.1360.1440.1370.140.140.1430.1370.1420

23、.1430.1420.1352CL0.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.140.14LCL0.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.1300.130LSL0.120.120.120.120.120.120.120.120.120.120.120.120.12

24、0.120.120.120.120.120.120.120.120.120.120.120.12CL SLCP=2.13675K=0.0084CPK=2.1188313.1CPK解析-消除中心偏移量（圖）SL323.2CPK解析-穩(wěn)定性離散性原則CPK解析時Sigma較大 CP 2 CPK 1.67具體解析過程可以用Xbar-R 管制分析法難難333.2CPK解析-Xbar-R 分析步驟 1計算XbarRXbar.barRbar 2計算R的管控線并判斷 3剔除異常的點(超出規(guī)格的)查找異常的原因 4重復(fù)123步驟直到全部在管控范圍內(nèi) 5計算Xbar的管控線并判斷 6剔除異常的點(超出規(guī)格的)查

25、找異常的原因 7重復(fù)1到6步驟直到全部在管控范圍內(nèi) 8落實查找出來的改善措施 9再次復(fù)驗。34n1計算XbarRXbar.barRbarR.UCL=D4*R.bar =2.12*0.0127=0.02694R.LCL=D3*R.bar =0*0.013=0NA2d2D4D321.881.133.27031.021.692.58040.732.062.28050.582.332.1201234567891011121314151617181920212223242510.1370.1190.1370.1330.1580.140.1480.1440.1370.1440.1440.1230.1330

26、.140.1330.140.1440.1290.1370.140.140.1440.1370.1330.13320.1440.1490.1480.1370.1510.1440.140.1330.1480.1480.1480.1280.1480.1480.1370.1480.140.140.1440.1370.1480.1510.1330.1370.13730.1510.1220.1440.140.1550.1480.1330.1370.1480.1510.1440.120.1480.1440.1370.140.1370.1440.1370.1440.140.140.1370.1330.1440

27、.1370.1240.140.1370.1490.140.1370.1330.1510.14830.1330.1310.1370.1370.1330.1370.1290.140.1330.140.1370.1440.140.1370.15150.140.1310.1440.140.1480.1440.140.1440.1480.1370.1440.1190.140.1370.140.1330.1370.140.140.1480.1480.1440.1440.140.144Xbar0.1420.1290.1430.1370.1520.1430.1400.1380.1460.1460.1430.1

28、240.1410.1410.1360.1400.1370.1390.1380.1420.1430.1450.1380.1360.141R0.0140.0300.0110.0070.0100.0080.0150.0110.0140.0140.0150.0120.0150.0110.0070.0150.0150.0150.0110.0110.0110.0110.0110.0070.018USL=CP=Rbar=Sigma=0.00545Rbar=0.16SL=0.14LSL=0.120.139970.0130.01271R.UCL=0.026942Xbar.bar=R.LCL=035n2計算R的管

29、控線此時的X.bar圖0.000.010.010.020.020.030.030.0412345678910111213141516171819202122232425UCLRLCL異常點UCL0. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 1560. 156USL0. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600.

30、 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 160SL0. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 140Xbar0. 1420. 1290. 1430. 1370. 1520. 1430. 1400. 1380. 1460. 1460.

31、 1430. 1240. 1410. 1410. 1360. 1400. 1370. 1390. 1380. 1420. 1430. 1450. 1380. 136LSL0. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 120LCL0. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240.

32、 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1240. 1150. 1350. 15512345678910111213141516171819202122232425USLSLXbarLSLUCLLCL36n3重新計算-剔除R圖中的不合格點(第2點)134567891011121314151617181920212223242510.1370.1370.1330.1580.140.1480.1440.1370.1440.1440.1230.1330.140.1330.140.1440.129

33、0.1370.140.140.1440.1370.1330.13320.1440.1480.1370.1510.1440.140.1330.1480.1480.1480.1280.1480.1480.1370.1480.140.140.1440.1370.1480.1510.1330.1370.13730.1510.1440.140.1550.1480.1330.1370.1480.1510.1440.120.1480.1440.1370.140.1370.1440.1370.1440.140.140.1370.1330.1440.1370.140.1370.1490.140.1370.133

34、0.1510.14830.1330.1310.1370.1370.1330.1370.1290.140.1330.140.1370.1440.140.1370.15150.140.1440.140.1480.1440.140.1440.1480.1370.1440.1190.140.1370.140.1330.1370.140.140.1480.1480.1440.1440.140.144Xbar0.1420.1430.1370.1520.1430.1400.1380.1460.1460.1430.1240.1410.1410.1360.1400.1370.1390.1380.1420.143

35、0.1450.1380.1360.141R0.0140.0110.0070.0100.0080.0150.0110.0140.0140.0150.0120.0150.0110.0070.0150.0150.0150.0110.0110.0110.0110.0110.0070.018USL=CP=Rbar=Xbar.bar=R.LCL=00.01196R.UCL=0.025348Sigma=0.00505Rbar=0.16SL=0.14LSL=0.120.140430.012剔除后X.bar.bar及R.bar值均發(fā)生變化。R圖符合要求。0.000.010.010.020.020.030.031

36、345678910111213141516171819202122232425UCLRLCL37n4計算Xbar的管控線134567891011121314151617181920212223242510.1370.1370.1330.1580.140.1480.1440.1370.1440.1440.1230.1330.140.1330.140.1440.1290.1370.140.140.1440.1370.1330.13320.1440.1480.1370.1510.1440.140.1330.1480.1480.1480.1280.1480.1480.1370.1480.140.140

37、.1440.1370.1480.1510.1330.1370.13730.1510.1440.140.1550.1480.1330.1370.1480.1510.1440.120.1480.1440.1370.140.1370.1440.1370.1440.140.140.1370.1330.1440.1370.140.1370.1490.140.1370.1330.1510.14830.1330.1310.1370.1370.1330.1370.1290.140.1330.140.1370.1440.140.1370.15150.140.1440.140.1480.1440.140.1440

38、.1480.1370.1440.1190.140.1370.140.1330.1370.140.140.1480.1480.1440.1440.140.144Xbar0.1420.1430.1370.1520.1430.1400.1380.1460.1460.1430.1240.1410.1410.1360.1400.1370.1390.1380.1420.1430.1450.1380.1360.141R0.0140.0110.0070.0100.0080.0150.0110.0140.0140.0150.0120.0150.0110.0070.0150.0150.0150.0110.0110

39、.0110.0110.0110.0070.018USL=CP=Rbar=Xbar.bar=R.LCL=01.312975UCL=0.01196R.UCL=0.0253481.320029K=0.005344CPK=Sigma=0.00505Rbar=0.16SL=0.14LSL=0.120.140430.0120.1252760.155579CL=0.140428LCL=UCL= Xbar.bar+A2*Rbar=0.14043+0.577*0.012=0.147354LCL= Xbar.bar -A2*Rbar =0.14043-0.577*0.012=0.13350638UCL0. 147

40、0. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 1470. 147USL0. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 1600. 160SL0. 1400. 1400. 1400. 1400

41、. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 1400. 140Xbar0. 1420. 1430. 1370. 1520. 1430. 1400. 1380. 1460. 1460. 1430. 1240. 1410. 1410. 1360. 1400. 1370. 1390. 1380. 1420. 1430. 1450. 1380. 136LSL0. 1200. 1200. 1200. 1200. 1200. 1200. 120

42、0. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 1200. 120LCL0. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1330. 1150. 1350. 1551345678910111213141516171819202122232425USLSL

43、XbarLSLUCLLCLn5剔除異常的點(超出規(guī)格的)查找異常的原因異常點異常點異常點異常點39n6重新計算-剔除第512點Xbar.barRbar都需要重新計算檢查R圖符合要求134678910111314151617181920212223242510.1370.1370.1330.140.1480.1440.1370.1440.1440.1330.140.1330.140.1440.1290.1370.140.140.1440.1370.1330.13320.1440.1480.1370.1440.140.1330.1480.1480.1480.1480.1480.1370.1480.

44、140.140.1440.1370.1480.1510.1330.1370.13730.1510.1440.140.1480.1330.1370.1480.1510.1440.1480.1440.1370.140.1370.1440.1370.1440.140.140.1370.1330.1440.1370.140.1370.140.1370.1330.1510.14830.1330.1370.1370.1330.1370.1290.140.1330.140.1370.1440.140.1370.15150.140.1440.140.1440.140.1440.1480.1370.1440.1

45、40.1370.140.1330.1370.140.140.1480.1480.1440.1440.140.144Xbar0.1420.1430.1370.1430.1400.1380.1460.1460.1430.1410.1410.1360.1400.1370.1390.1380.1420.1430.1450.1380.1360.141R0.0140.0110.0070.0080.0150.0110.0140.0140.0150.0150.0110.0070.0150.0150.0150.0110.0110.0110.0110.0110.0070.018USL=XbbCP=UCLRbar=0.1336270.147633CL=0.140630LCL=Si