ISO INTERNATIONAL STANDARD 22514-8 First edition 2014-06-01 Statistical methods in process management - Capability and performance - Part 8: Machine performance of a multi-state production process Méthodes statistiques dans la gestion de processus - Aptitude et performance Partie 8: Aptitude machine d'un procédé de production multimodal Reference number IS022514-8:2014(E) LSO Copyright International Organization for Standardization @ IS0 2014 I without license from IHS Not for Resale IS0 22514-8:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax +4122 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 22514-8:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references 3 Terms and definitions ..2 4 Symbols and abbreviations ..5 5 Preliminary technical analysis of the process .6 5.1 General. .6 5.2 Identification of intrinsic factors .6 5.3 Determination of process-specific states. .7 6 Preliminary verifications before calculating the machine performance indices .7 6.1 Measurement system. 7 6.2 Definition of the sampling plan for estimating global intrinsic dispersion 8 7 Estimation of global intrinsic dispersion and calculation of machine performance indices8 7.1 General. .8 7.2 Verification on the absence of outliers in the set of made measurement results. .9 7.3 Determinationofthewidthsoflocalintrinsicdispersions 10 7.4 Determination of the locations of local intrinsic dispersions 11 7.5 Global intrinsic dispersion: type and estimation. .12 7.6 Calculation of capability indices Pm and Pmk .14 7.7 Acceptance thresholds for the machine performance indices ..15 Annex A (informative) States qualifying a processing process ..16 Annex B (normative) Statistical tests ..32 Bibliography .37 iii e with IS t license from IHS Not for Resale