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1、BRITISH STANDARD BS ISO 21247:2005 Combined accept-zero sampling systems and process control procedures for product acceptance ICS 03.120.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 21247:2005 This British Standard was publis
2、hed under the authority of the Standards Policy and Strategy Committee on 5 May 2005 BSI 5 May 2005 ISBN 0 580 45958 6 National foreword This British Standard reproduces verbatim ISO 21247:2005 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Te
3、chnical Committee SS/5, Acceptance sampling schemes, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may
4、be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users ar
5、e responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and
6、 keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 41 and a back cover. The BSI copyright no
7、tice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 21247:2005(E) OSI 5002 INTERNATIONAL
8、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 lacceptation de produits BS ISO 21247:2005 Licensed Copy: sheffield
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14、 5002 Allr ithgsr esedevr BS ISO 21247:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:74212 O5002(E) I SO 5002 All irthgs ersedevr iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms, definitions a
15、nd 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 Critical characteristics11 4.5 Special reservations for critical nonconformity 11 5 Detailed requirements 11 5.1
16、 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 withheld23 Annex C (informative) Graphical representation of switching rules.25 Annex D (normative) Examples of u
17、se of sampling systems28 Annex E (informative) Summary tables34 Bibliography .41 BS ISO 21247:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:74212 O5002(E) iv I SO 5002 All irthgs ersedevr Foreword ISO (the International Organizatio
18、n for Standardization) 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
19、 the right 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. Inter
20、national Standards 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. Publicat
21、ion as an International 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 righ
22、ts. ISO 21247 was prepared by Technical Committee ISO/TC 69, Applications of statistical methods, Subcommittee SC 5, Acceptance sampling. BS ISO 21247:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:74212 O5002(E) I SO 5002 All irthg
23、s ersedevr v Introduction Enlightened quality-based management practices encourage industry innovation and provide flexibility to achieve the benefits of continuous improvement. There is an evolving industrial product quality philosophy that recognizes the need for quality policy changes that will p
24、rovide suppliers with opportunities and incentives toward improvement of product quality and cooperative relationships between the supplier and the customer. Properly employed, process controls and statistical control methods are effective means of preventing nonconformities, controlling quality, an
25、d generating information for systematic improvement. An effective process control system may also be used to provide information to assess the quality of deliverables submitted for acceptance. This International Standard encourages suppliers to use process control and statistical control procedures
26、for their internal control and to submit effective process control procedures to the customer for approval, so that the need for acceptance sampling procedures can be reduced or even eliminated. Sampling inspection by itself can be an inefficient industrial practice for demonstrating conformance. Th
27、e application of sampling plans for acceptance involves both consumer and producer risks; increased sampling is one way of reducing these risks, but it also increases costs. Suppliers can reduce risks by employing efficient processes with appropriate process controls. To the extent that such practic
28、es are properly employed and are effective, risk is controlled and, consequently, inspection and testing can be reduced. This International Standard supports those whose preference is to move away from an acceptance quality limit (AQL)-based inspection (detection) strategy to implementation of an ef
29、fective prevention-based strategy including a comprehensive quality management system, continuous improvement and partnering. The underlying theme is cooperation between customer and supplier, with the requisite competence of both parties, and a clear mutual benefit from processes capable of consist
30、ently high quality products and services. The objective is to create an atmosphere where every non-compliance is an opportunity for corrective action and improvement, rather than one where AQLs are the contractually sufficient goals. The following points provide the basis for this International Stan
31、dard: a) suppliers are required to submit deliverables that conform to requirements and to generate and maintain sufficient evidence of conformance; b) suppliers are responsible for establishing their own manufacturing and process controls to produce results in accordance with requirements; c) suppl
32、iers are expected to use recognized prevention practices such as statistical process control. This International Standards goal, ideally, 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 p
33、lanning and conducting inspections to assess quality and conformance to specified requirements. The intent of including provisions for acceptance sampling is as a verification of the efficacy of process controls, or as an interim measure while such controls are being developed and implemented. When
34、acceptance sampling is conducted using the tables of this International Standard, the supplier has the option to inspect using any one of three types of sampling: single sampling by attributes; single sampling by variables; continuous sampling by attributes. Switching procedures are also provided to
35、 allow movement among normal, tightened and reduced inspection severities. Some organizations have a policy of not using sampling plans indexed by AQLs. This International Standard complies with that policy. BS ISO 21247:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00
36、2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADR IS:74212 O5002(E) I SO 5002 All irthgs ersedevr 1 Combined accept-zero sampling systems and process control procedures for product accept
37、ance 1 Scope This International Standard provides a set of accept-zero sampling systems and procedures for planning and conducting inspections to assess quality and conformance to specified requirements. In addition, this International Standard provides requirements for alternative acceptance method
38、s proposed by the supplier. Such alternative methods would be based upon establishing and implementing an internal prevention-based quality management system as a means of ensuring that all products conform to requirements specified by the contract and associated specifications and standards. This I
39、nternational Standard, when cited in contract, is applicable to the supplier and extends to subcontractors or vendors. The quality plans are to be applied as specified in the contract documents, and deliverables may be submitted for acceptance if the requirements of this International Standard have
40、been met. Sampling systems and procedures in this International Standard are applicable, when appropriate, to assess conformance to requirements of the following: a) end items; b) components or basic materials; c) operations or services; d) materials in process; e) supplies in storage; f) maintenanc
41、e operations; g) data or records; h) administrative procedures. NOTE Use of the word “product” throughout this International Standard also refers to services and other deliverables. The sampling systems and procedures of this International Standard are not intended for use with destructive tests or
42、where product screening is not feasible or desirable. In such cases, the sampling systems to be used will be specified in the contract or product specifications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, on
43、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3534-1:1), Statistics Vocabulary and symbols Part 1: Probability and general statistical terms ISO 3534-2:2), Statistics Vocabulary and symbols Part 2: Applied
44、statistics ISO 9000:2000, Quality management systems Fundamentals and vocabulary 1) To be published. (Revision of ISO 3534-1:1993) 2) To be published. (Revision of ISO 3534-2:1993) BS ISO 21247:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 01:54:03 GMT+00:00 2006, Uncontrolled Copy, (c
45、) BSI IS:74212 O5002(E) 2 I SO 5002 All irthgs ersedevr 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 9000, ISO 3534-1, ISO 3534-2 and the following apply. 3.1.1 acceptance act of an authorized repre
46、sentative of the customer by which the customer, for itself or as agent of another, assumes ownership of existing identified products tendered or approves specific services rendered as partial or complete performance of the contract 3.1.2 average outgoing quality AOQ expected average quality level o
47、f outgoing product for a given value of incoming product quality NOTE Adapted from ISO 3534-2:, definition 1.4.7.1. 3.1.3 average outgoing quality limit AOQL maximum AOQ over all possible values of incoming product quality level for a given acceptance sampling plan and rectification of all non-accep
48、ted lots unless specified otherwise ISO 3534-2:, definition 1.4.7.2 3.1.4 acceptance quality limit AQL quality level that is the worst tolerable average quality of a process, when a continuing series of lots is submitted for acceptance sampling 3.1.5 contract quality requirements technical requireme
49、nts in the contract relating to the quality of the product or service and those contract clauses prescribing inspection, and other quality control procedures incumbent on the supplier, to assure that the product or service conforms to the contractual requirements 3.1.6 critical characteristic characteristic that judgment and experience indicate must be met to avoid hazardous or unsafe conditions for individuals using, maintaining, or depending upon the product; or th
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