1、BS ISO 12302:2017Plain bearings Qualitycharacteristics Statisticalprocess control (SPC)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 12302:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12302:2017. It supersedes B
2、S 7762:1994 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/12, Plain bearings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisio
3、ns of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 92970 0 ICS 21.100.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published
4、 under the authority of the Standards Policy and Strategy Committee on 31 March 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 12302:2017 ISO 2017Plain bearings Quality characteristics Statistical process control (SPC)Paliers lisses Caractristiques de qualit Co
5、ntrle statistique du procd (CSP)INTERNATIONAL STANDARDISO12302Second edition2017-03Reference numberISO 12302:2017(E)BS ISO 12302:2017ISO 12302:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part
6、 of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member bod
7、y in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 12302:2017ISO 12302:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 SPC met
8、hods 15 Selection of SPC quality characteristics 16 Geometric quality characteristics 27 Material quality characteristics 4 ISO 2017 All rights reserved iiiContents PageBS ISO 12302:2017ISO 12302:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of nat
9、ional 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 to be represented on that committee. Interna
10、tional 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. The procedures used to develop this document and those inten
11、ded for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www
12、.iso .org/ directives).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. Details of any patent rights identified during the development of the document
13、 will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the
14、 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared
15、by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 5, Quality analysis and assurance.This second edition cancels and replaces the first edition (ISO 12302:1993), which has been technically revised.iv ISO 2017 All rights reservedBS ISO 12302:2017INTERNATIONAL STANDARD ISO 12302:2017(E
16、)Plain bearings Quality characteristics Statistical process control (SPC)1 ScopeThis document specifies for plain bearings (except thick-walled half-bearings) those quality characteristics in accordance with ISO 12301 which can be used to regulate and control a production process on the basis of sta
17、tistical process control (SPC).It covers dimensional variables but does not take account of attributes.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the e
18、dition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 12301, Plain bearings Quality control techniques and inspection of geometrical and material quality characteristics3 Terms and definitionsFor the purposes of this docume
19、nt, the following definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1quality characteristic
20、characteristic by means of which the quality of a plain bearing is assessed3.2statistical process control SPCcontrol of quality characteristics of plain bearings during the production process by means of statistical techniques in order to comply with quality requirements4 SPC methodsThe applied stat
21、istical methods used to achieve control of a production process may be different and thus are to be agreed upon between the manufacturer and customer.5 Selection of SPC quality characteristicsDepending on the intended purpose, function, etc. of the plain bearings to be used, the manufacturer and cus
22、tomer shall select and stipulate the particular characteristics for SPC according to Clause 6.It should be noted that the designated characteristics in the matrix of Clause 6 have been prepared as a guide. ISO 2017 All rights reserved 1BS ISO 12302:2017ISO 12302:2017(E)6 Geometric quality characteri
23、sticsThe quality characteristics are classified into three groups: preferred, optional or unsuitable.Following the order of the specified characteristics in accordance with ISO 12301, these quality characteristics are listed in the form of a matrix as:preferred with “yes”;optional with “(yes)”;unsui
24、table with “no”;not relevant with “”.Those quality characteristics which are marked with “(yes)” and “no” are accompanied by an explanation in the column “remarks” in Table 1.A horizontal dash () in a column means that this characteristic is not relevant for the specific type of plain bearing.Table
25、1 Geometric quality characteristicsSubclause No. (accord-ing to ISO 12301)Quality character-isticType of plain bearingRemarksThin-walled halfbear-ingWrapped bushUnsplit metal-lic bushSolid poly-mer bushSin-tered bushThrust washer (ring and half)a b c d e f6.1Wall thickness6.1.1Line measurementno no
26、no no no a and b to e: There is an unlimited number of values on a single measuring line ranging between minimum and maximum6.1.2Point measurement (defined)yes (yes) yes yes (yes) yesb: Only where it is possible to measure at prede-termined pointse: For closed tolerance requirement, 100 % grading ma
27、y be requested as an alternative to SPC6.2Outside diameter yes yes yes yes (yes)f: Blanking tool; tool checking by means of initial product acceptance with each order2 ISO 2017 All rights reservedBS ISO 12302:2017ISO 12302:2017(E)Subclause No. (accord-ing to ISO 12301)Quality character-isticType of
28、plain bearingRemarksThin-walled halfbear-ingWrapped bushUnsplit metal-lic bushSolid poly-mer bushSin-tered bushThrust washer (ring and half)a b c d e f6.3Inside diameter (yes) yes yes yes (yes)b: Normally determined by wall thickness and outside diameterf: Blanking tool; tool checking by means of in
29、itial product acceptance with each order6.4 Width (yes) (yes) (yes) (yes) (yes) a and b to e: Not a primary charac-teristic6.5Locating featuresno noa and f: Are only locating aids6.6Lubricant feed and distribution featuresno no no no noa, b to d and f: Not a primary characteristic6.7Surface conditio
30、nsno no no no no noa and b to f: No Gaussian distribu-tion of measured values6.8 Crush height yes 6.9 Free spread (yes) a: Not a primary characteristic6.10Straightness of sliding surfaceno a: Graphical evaluation in most cases6.11Joint face taper(yes) a: Not a primary characteristic6.12Back contact
31、(proportion of surface area)no a: Attribute (qualitative) characteristic6.13Joint displacement (yes) b: Will be adjusted when fitting the bush into the housing bore; attribute charac-teristic6.14Height of thrust half-washer (thickness) (yes)f: Blanking tool; tool checking by means of initial product
32、 acceptance with each order6.15 Flatness no f: Attribute (qualitative) characteristicTable 1 (continued) ISO 2017 All rights reserved 3BS ISO 12302:2017ISO 12302:2017(E)Subclause No. (accord-ing to ISO 12301)Quality character-isticType of plain bearingRemarksThin-walled halfbear-ingWrapped bushUnspl
33、it metal-lic bushSolid poly-mer bushSin-tered bushThrust washer (ring and half)a b c d e f6.16 Flange diameter(yes) (yes) (yes) (yes) (yes) a and b to e: Not a primary charac-teristic6.17 Distance between flanges(yes) (yes) (yes) (yes) (yes) a and b to e: Not a primary characteristic6.18 Flange thic
34、kness(yes) (yes) (yes) (yes) (yes) a and b to e: Measuring point shall be defined6.19 Perpen-dicularity (squareness) of flange(yes) (yes) (yes) (yes) (yes) a and b to e: Not a primary characteristic6.20 Geometric deviations (yes) (yes) (yes) c, d and e: Not a primary characteristic7 Material quality
35、 characteristicsControl of the material manufacturing processes depends on a large number of parameters which involve “process-knowledge”. The manufacturer shall decide which parameters are to be checked using statistical techniques in accordance with customer requirements.Table 1 (continued)4 ISO 2
36、017 All rights reservedBS ISO 12302:2017BS ISO 12302:2017ISO 12302:2017(E) ISO 2017 All rights reservedICS 21.100.10Price based on 4 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and se
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