ISO-21247-2005.pdf
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1、 Reference number ISO 21247:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 21247 First edition 2005-03-15 Combined accept-zero sampling systems and process control procedures for product acceptance Systmes dchantillonnage de tolrance zro-dfaut et procdures de matrise des processus combins pour laccepta
2、tion de produits ISO 21247:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the
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5、 at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address b
6、elow or ISOs 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 + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reserved -,-,- ISO 21247:2005(E) ISO 2005 All rights r
7、eserved iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms, definitions and symbols2 3.1 Terms and definitions.2 3.2 Symbols .7 4 General requirements.8 4.1 Product requirements.8 4.2 Acceptance by tables .8 4.3 Acceptance by supplier-proposed provisions.9 4.4 Cri
8、tical characteristics11 4.5 Special reservations for critical nonconformity 11 5 Detailed requirements 11 5.1 Acceptance by tables .11 5.2 Acceptance by supplier-proposed provisions.19 Annex A (informative) Why accept-zero?.22 Annex B (informative) Disposition of lot when customer acceptance is with
9、held23 Annex C (informative) Graphical representation of switching rules.25 Annex D (normative) Examples of use of sampling systems28 Annex E (informative) Summary tables34 Bibliography .41 -,-,- ISO 21247:2005(E) iv ISO 2005 All rights reserved Foreword ISO (the International Organization for Stand
10、ardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right
11、to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International St
12、andards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I
13、nternational Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 212
14、47 was prepared by Technical Committee ISO/TC 69, Applications of statistical methods, Subcommittee SC 5, Acceptance sampling. ISO 21247:2005(E) ISO 2005 All rights reserved v Introduction Enlightened quality-based management practices encourage industry innovation and provide flexibility to achieve
15、 the benefits of continuous improvement. There is an evolving industrial product quality philosophy that recognizes the need for quality policy changes that will provide suppliers with opportunities and incentives toward improvement of product quality and cooperative relationships between the suppli
16、er and the customer. Properly employed, process controls and statistical control methods are effective means of preventing nonconformities, controlling quality, and generating information for systematic improvement. An effective process control system may also be used to provide information to asses
17、s the quality of deliverables submitted for acceptance. This International Standard encourages suppliers to use process control and statistical control procedures for their internal control and to submit effective process control procedures to the customer for approval, so that the need for acceptan
18、ce sampling procedures can be reduced or even eliminated. Sampling inspection by itself can be an inefficient industrial practice for demonstrating conformance. The application of sampling plans for acceptance involves both consumer and producer risks; increased sampling is one way of reducing these
19、 risks, but it also increases costs. Suppliers can reduce risks by employing efficient processes with appropriate process controls. To the extent that such practices are properly employed and are effective, risk is controlled and, consequently, inspection and testing can be reduced. This Internation
20、al Standard supports those whose preference is to move away from an acceptance quality limit (AQL)-based inspection (detection) strategy to implementation of an effective prevention-based strategy including a comprehensive quality management system, continuous improvement and partnering. The underly
21、ing theme is cooperation between customer and supplier, with the requisite competence of both parties, and a clear mutual benefit from processes capable of consistently high quality products and services. The objective is to create an atmosphere where every non-compliance is an opportunity for corre
22、ctive action and improvement, rather than one where AQLs are the contractually sufficient goals. The following points provide the basis for this International Standard: a) suppliers are required to submit deliverables that conform to requirements and to generate and maintain sufficient evidence of c
23、onformance; b) suppliers are responsible for establishing their own manufacturing and process controls to produce results in accordance with requirements; c) suppliers are expected to use recognized prevention practices such as statistical process control. This International Standards goal, ideally,
24、 is to have product accepted as a result of control procedures. It also, however, provides a set of accept-zero sampling systems (see Annex A) and procedures for planning and conducting inspections to assess quality and conformance to specified requirements. The intent of including provisions for ac
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