水平、公差范围、CPK与不良率(PPM)对照表

水平、公差范围、CPK与不良率(PPM)对照表
水平、公差范围、CPK与不良率(PPM)对照表

σ水平、公差T、CPK水平与不良品率的关系一览表

Note: 1、 available for bilateral tolerance (双向公差适用);

2、 k(σ)对应于控制范围,σ是实际的计算值,如果客户规范公差范围对应的k值是2.34,对应的cpk是0.78,不良品率=19283ppm;

3、 %T是实际控制6 σ占规范公差T的比例,假如实际6σ等于规范公差T,则CPk=1.0。CPK要达到1.33的水平,6σ=T*75%;

举例: 1、客户公差范围T=5,我们内控6σ范围=4,则%T=80%,对应的CPK=1.25,不良品率=175.8ppm;

2、实际的CPK=0.83,控制范围:±2.49σ,按6sigma理论则是5sigma;

3、 6sigma项目是指CPK2.0,公差带内需能容纳12σ(±6σ);

sigma水平、公差范围、CPK与不良率(PPM)对照表

1666.7%0.180.06800000107.5% 2.790.935270.868.0% 4.41 1.4710.34 769.2%0.390.137********.4% 2.820.944802.3667.6% 4.44 1.489 625.0%0.480.166********.3% 2.850.954371.9267.1% 4.47 1.497.82 454.5%0.660.22500000104.2% 2.880.963976.7566.7% 4.5 1.5 6.8 357.1%0.840.28400000103.1% 2.910.973614.2966.2% 4.53 1.51 5.9 303.0%0.990.33317310102.0% 2.940.983282.1265.8% 4.56 1.52 5.12 285.7% 1.050.35293800101.0% 2.970.99297865.4% 4.59 1.53 4.43 263.2% 1.140.38250000100.0%312699.864.9% 4.62 1.54 3.84 250.0% 1.20.423020099.0% 3.03 1.012445.5464.5% 4.65 1.55 3.32 232.6% 1.290.4320000098.0% 3.06 1.022213.3764.1% 4.68 1.56 2.87 222.2% 1.350.4517700097.1% 3.09 1.032001.5663.7% 4.71 1.57 2.48 208.3% 1.440.4815000096.2% 3.12 1.041808.5163.3% 4.74 1.58 2.14 196.1% 1.530.51126016.7395.2% 3.15 1.051632.762.9% 4.77 1.59 1.84 192.3% 1.560.52118759.8894.3% 3.18 1.061472.7562.5% 4.8 1.6 1.59 188.7% 1.590.53111834.8193.5% 3.21 1.071327.3562.1% 4.83 1.61 1.37 185.2% 1.620.54105232.2892.6% 3.24 1.081195.361.7% 4.86 1.62 1.17 181.8% 1.650.5598942.9491.7% 3.27 1.091075.4761.3% 4.89 1.63 1.01 178.6% 1.680.5692957.3290.9% 3.3 1.1966.8561.0% 4.92 1.640.8654 175.4% 1.710.5787265.8790.1% 3.33 1.11868.4660.6% 4.95 1.650.7421 172.4% 1.740.5881859.0289.3% 3.36 1.12779.4260.2% 4.98 1.660.6358 169.5% 1.770.5976727.1488.5% 3.39 1.13698.9359.9% 5.01 1.670.5443 166.7% 1.80.671860.6487.7% 3.42 1.14626.2159.5% 5.04 1.680.4655 163.9% 1.830.6167249.9487.0% 3.45 1.15560.5959.2% 5.07 1.690.3978 161.3% 1.860.6262885.5386.2% 3.48 1.16501.4158.8% 5.1 1.70.3397 158.7% 1.890.6358757.9685.5% 3.51 1.17448.1158.5% 5.13 1.710.2897 156.3% 1.920.6454857.984.7% 3.54 1.18400.1358.1% 5.16 1.720.2469 153.8% 1.950.6551176.1284.0% 3.57 1.19356.9857.8% 5.19 1.730.2103 151.5% 1.980.6647703.5383.3% 3.6 1.2318.2257.5% 5.22 1.740.1789 149.3% 2.010.6744431.1982.6% 3.63 1.21283.4257.1% 5.25 1.750.1521 147.1% 2.040.6841350.3382.0% 3.66 1.22252.2256.8% 5.28 1.760.1292 144.9% 2.070.6938452.3481.3% 3.69 1.23224.2556.5% 5.31 1.770.1096

CPK 不合格率对照表

Cpk PPM Cpk PPM Cpk PPM 0.51 126016.73 1.01 2445.54 1.51 5.90 0.52 118759.88 1.02 2213.37 1.52 5.12 0.53 111834.81 1.03 2001.56 1.53 4.43 0.54 105232.28 1.04 1808.51 1.54 3.84 0.55 98942.94 1.05 1632.70 1.55 3.32 0.56 92957.32 1.06 1472.75 1.56 2.87 0.57 87265.87 1.07 1327.35 1.57 2.48 0.58 81859.02 1.08 1195.30 1.58 2.14 0.59 76727.14 1.09 1075.47 1.59 1.84 0.60 71860.64 1.10 966.85 1.60 1.59 0.61 67249.94 1.11 868.46 1.61 1.37 0.62 62885.53 1.12 779.42 1.62 1.17 0.63 58757.96 1.13 698.93 1.63 1.01 0.64 54857.90 1.14 626.21 1.64 0.8654 0.65 51176.12 1.15 560.59 1.65 0.7421 0.66 47703.53 1.16 501.41 1.66 0.6358 0.67 44431.19 1.17 448.11 1.67 0.5443 0.68 41350.33 1.18 400.13 1.68 0.4655 0.69 38452.34 1.19 356.98 1.69 0.3978 0.70 35728.84 1.20 318.22 1.70 0.3397 0.71 33171.61 1.21 283.42 1.71 0.2897 0.72 30772.67 1.22 252.22 1.72 0.2469 0.73 28524.24 1.23 224.25 1.73 0.2103 0.74 26418.77 1.24 199.22 1.74 0.1789 0.75 24448.95 1.25 176.83 1.75 0.1521 0.76 22607.69 1.26 156.83 1.76 0.1292 0.77 20888.15 1.27 138.97 1.77 0.1096 0.78 19283.74 1.28 123.03 1.78 0.0929

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