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1、INTERNATIONAL STANDARD IS0 12303 First edition 1995-02-I 5 Plain bearings - Quality characteristics - Calculation of machine and process capabilities Paliers lisses - Caractkistiques de qualitk - Calcul de la capabilit6 de la machine et cfu pro 5.2.2 Process capability index (spread and setting), Cp
2、k The C, index is a value used to determine the spread of a manufacturing process and the setting of the mean value of the frequency distribution within the limits of the specifications. The value of Cpk is given by CpkC UL -x= 3G or x-LL 32 whichever is the smaller value. The value of C, should be
3、2 1 (1,331. Table 1 - Constant for calculation of estimated standard deviation Subgroup size Factor11 n 4 2 1,128 3 1,693 4 2,059 5 2,326 6 2,534 7 2,704 8 2,847 9 2,970 10 3,078 1) Confidence level of 99.73 %. where the factor 4 is given in table 1. 3 Copyright International Organization for Standa
4、rdization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 12303:1995(E) Annex A (informative) Example of graphical test using probability paper Figu
5、reA. gives an example of a graphical test for crush height. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:43:01 MDTNo reproduction or networking permitted without license fr
6、om IHS -,-,- IS0 12303:1995(E) - - - - 0 ,F 0 - - Figure A.1 - Example of a graphical test for crush height 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:43:01 MDTNo repro
7、duction or networking permitted without license from IHS -,-,- IS0 12303:1995(E) ICS 21.100.10 Descriptors: beanngs, plain beanngs, production, quality, quahty control, statistlcal quality control, rules of calculation. Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,-
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