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VW_10131_EN，2005年版本的，比较早，仅供参考。Descriptors: process capability investigation, process data analysis, capability index, quality capability, managed process, capable process, process time model
1 Purpose and scope....2
2 Principle of the process capability investigation.............3
3 Theoretical principles..............4
3.1 Process time models..............4
3.2 Distribution models....9
3.2.1 Normal distribution.....9
3.2.2 Absolute value distribution, type I......10
3.2.3 Type II absolute value distribution (Rayleigh distribution).........12
3.2.4 Extended normal distribution.............13
3.2.5 Mixed distribution....14
3.3 Determination of capability...15
3.3.1 Determination of capability for defined distribution models.......16
3.3.2 Determination of capability for undefined distribution models...25
3.4 Limit values for process capability.....28
3.5 Statistical tests........30
4 Carrying out a process capability investigation............35
4.1 Test equipment use..............40
4.2 Sampling....40
4.3 Special regulation for restricted PFI...41
4.4 Data analysis...........41
4.4.1 Selection of the expected distribution model...41
4.4.2 Test for outliers........42
4.4.3 Take outliers out of the calculation of statistics............42
4.4.4 Test for change of process control.....42
4.4.5 Test for change of process location...42
4.4.6 Evaluation according to process time models A...........43
4.4.7 Test for deviation from the instantaneous normal distribution...44
4.4.8 Evaluation according to process time models C..........44
4.4.9 Evaluation according to process time model B............45
4.4.10 Evaluation according to process time model D............45
4.5 Documentation........46
4.6 Results evaluation...47
4.7 Process improvement...........49
4.8 Handling of unmanaged or incapable processes.........49
5 Examples...50
6 Referenced standards..........60
7 Referenced literature............60
8 Keyword index.........61 |
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