CPK急救

如下是我司客人導入我司材料評估測試的資料,客人提出各流程中CPK较小，数值较散，制程能力不稳定.

客人做的cpk有沒有問題啊?比如材料規格/上下限設置等,另外客戶這麼做CPK是不是不規範啊,CPK的前提不是要數據處於受控狀態嗎,是不是要看管製圖?

以上求該人指點,感激不盡




Upper Spec. 31.205 31.205 31.205 31.205 31.205
Center 31.175 ± 0.030 31.175 ± 0.030 31.175 ± 0.030 31.175 ± 0.030 31.175 ± 0.030
Lower Spec. 31.145 31.145 31.145 31.145 31.145
N0 蚀刻后 贴合烘烤后 绿油后 化金后 冲型后
1 31.174 31.186 31.178 31.170 31.166
2 31.193 31.175 31.170 31.175 31.173
3 31.190 31.188 31.167 31.179 31.196
4 31.182 31.183 31.165 31.193 31.191
5 31.190 31.181 31.174 31.192 31.212
6 31.172 31.181 31.171 31.177 31.189
7 31.168 31.180 31.175 31.185 31.187
8 31.172 31.176 31.174 31.184 31.196
9 31.193 31.192 31.178 31.190 31.192
10 31.204 31.194 31.171 31.181 31.182
11 31.189 31.183 31.186 31.176 31.186
12 31.183 31.189 31.181 31.188 31.187
13 31.181 31.183 31.181 31.188 31.180
14 31.195 31.181 31.180 31.180 31.173
15 31.207 31.197 31.156 31.177 31.195
16 31.191 25.908 31.199 31.181 31.194 31.237
17 31.183 31.184 31.167 31.190 31.200
18 31.171 25.000 31.181 31.184 31.192 31.215
19 31.182 31.176 31.177 31.189 31.204
20 31.187 31.191 31.178 31.188 31.221
21 31.196 31.186 31.169 31.193 31.236
22 31.190 31.186 31.164 31.188 31.223
23 31.200 31.189 31.181 31.185 31.190
24 31.185 31.190 31.184 31.185 31.231
25 31.188 31.175 31.176 31.184 31.215
26 31.184 31.192 31.177 31.184 31.203
27 31.193 31.190 31.169 31.189 31.170
28 31.184 31.187 31.179 31.187 31.191
29 31.186 31.183 31.172 31.194 31.215
30 31.181 31.193 31.170 31.182 31.194
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Statistic
n 32 30 30 30 30
Max 31.2070 31.1990 31.1860 31.1940 31.2370
Min 25.0000 31.1750 31.1560 31.1700 31.1660
Average 30.8282 31.1857 31.1745 31.1853 31.1983
Std Dev. 1.4145 0.0064 0.0069 0.0062 0.0192
3σ UCL 35.0718 31.2048 31.1951 31.2040 31.2559
3σ LCL 26.5845 31.1666 31.1539 31.1666 31.1408
No.of defect 0.0000 0.0000 0.0000 0.0000 0.0000
Defect rate 0.0000 0.0000 0.0000 0.0000 0.0000
Estimated %defect 0.9836 0.0012 0.0000 0.0008 0.3667
Cp 0.0071 1.5742 1.4541 1.6018 0.5213
k 11.5604 0.3567 0.0167 0.3433 0.7776
Cpk (0.0747) 1.0127 1.4299 1.0518 0.1160
6σ (2.1340) 3.0381 4.1966 3.1555 0.3406