© ISO 2017 Plain bearings — Quality characteristics — Statistical process control (SPC) Paliers lisses — Caractéristiques de qualité — Contrôle statistique du procédé (CSP) INTERNATIONAL STANDARD ISO[.]
INTERNATIONAL STANDARD ISO 12302 Second edition 2017-03 Plain bearings — Quality characteristics — Statistical process control (SPC) Paliers lisses — Caractéristiques de qualité — Contrôle statistique du procédé (CSP) Reference number ISO 12302:2017(E) © ISO 2017 ISO 12302:2017(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2017, Published in Switzerland All rights reserved Unless otherwise specified, no part o f 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 ISO’s member body in the country o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2017 – All rights reserved ISO 12302:2017(E) Contents Page Foreword iv Scope Normative references Terms and definitions SPC methods Selection of SPC quality characteristics Geometric quality characteristics Material quality characteristics © ISO 2017 – All rights reserved iii ISO 12302:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f the document 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 in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the voluntary nature o f standards, the meaning o f ISO specific terms and expressions related to formity assessment, as well as in formation about ISO’s 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 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 reserved INTERNATIONAL STANDARD ISO 12302:2017(E) Plain bearings — Quality characteristics — Statistical process control (SPC) Scope This c u ment s p e c i fie s for pla i n b e a ri ngs (excep t th ick-wa l le d h a l f-b e a ri ngs) tho s e qua l ity characteristics in accordance with ISO 12301 which can be used to regulate and control a production process on the basis of statistical process control (SPC) It covers dimensional variables but does not take account of attributes Normative references T he fol lowi ng c u ments are re ferre d to i n the tex t i n s uch a way th at s ome or a l l o f thei r content s titute s re qu i rements o f th i s c u ment For date d re ference s , on ly the e d ition cite d app l ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c ument (i nclud i ng a ny amend ments) appl ie s ISO 12301, Plain bearings — Quality control techniques and inspection of geometrical and material quality characteristics Terms and definitions For the pu r p o s e s o f th i s c u ment, the fol lowi ng defi n ition s apply ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia org/ — ISO Online browsing platform: available at http://www.iso org/obp 3.1 quality characteristic cha rac teri s tic b y me an s o f wh ich the qua l ity o f a plai n b e ari ng i s as s e s s e d 3.2 statistical process control SPC control o f qua l ity ch arac teri s tics o f plai n b e ari ngs du ri ng the pro duc tion pro ce s s by me an s o f s tati s tic a l te ch n ique s i n order to comply with qua l ity re qu i rements SPC methods T he appl ie d s tati s tic a l me tho d s u s e d to ach ieve control o f a pro duc tion pro ce s s may b e d i fferent a nd thus are to be agreed upon between the manufacturer and customer Selection of SPC quality characteristics Depending on the intended purpose, function, etc of the plain bearings to be used, the manufacturer and customer shall select and stipulate the particular characteristics for SPC according to Clause It should be noted that the designated characteristics in the matrix of Clause have been prepared as a guide © ISO 2017 – All rights reserved ISO : 01 7(E) Geometric quality characteristics The quality characteristics are classified into three groups: pre ferred, optional or unsuitable Following the order o f the specified characteristics in accordance with ISO 12301, these quality characteristics are listed in the form of a matrix as: pre ferred with “yes”; optional with “(yes)”; unsuitable 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 A horizontal dash (—) in a column means that this characteristic is not relevant for the specific type o f plain bearing Table — Geometric quality characteris tics Typ e of plain b earing Sub clause No (according to ISO 12301) Quality characteris tic Wall thickness Thinwal led halfbear- Wrapp ed bush ing a b Un s pl it meta ll ic bu sh c Solid p olymer bush d T hrus t Sin- washer tered (ring bush and Remarks half) e f and to : There is an unlimited number of values on a single measuring line ranging between minimum and maximum a 1 Line measurement no no no no no — b 6.2 Point measurement (defined) Outside diameter yes (yes) yes yes (yes) yes b e : Only where it is possible to measure at predetermined points : For closed tolerance requirement, 100 % grading may be requested as an alternative to SPC e : Blanking tool; tool checking by f — yes yes yes yes (yes) means of initial product acceptance with each order © ISO 2017 – All rights reserved ISO 02 : 01 7(E) Table (continued) Typ e of plain b earing Subclause No (according to ISO 12301) Quality characteris tic T hinwalled halfbear- Wrapp ed bush ing a b Un s p l it meta llic bu sh c Solid p olymer bush d T hrus t Sin- washer tered (ring bush and Remarks half) e f : Normally determined by b 6.3 6.5 6.6 6.8 10 11 6 14 15 Inside diameter Width Locating features Lubricant feed and distribution features — (yes) yes yes yes (yes) (yes) (yes) (yes) (yes) (yes) — no — — — — no no no no no — no Surface conditions no no no no no no Crush height Free spread Straightness of sliding surface Joint face taper Back contact (proportion of surface area) yes (yes) — — — — — — — — — — no — — — — — (yes) — — — — — no — — — — — Joint displacement Height of thrust half-washer (thickness) Flatness © ISO 2017 – All rights reserved — (yes) — — — — wall thickness and outside diameter : Blanking tool; tool checking by f means of initial product acceptance with each order and to : Not a primary characteristic and : Are only locating aids , to and : Not a primary characteristic and to : No Gaussian distribution of measured values a b a f a b a a e d b f f : Not a primary characteristic : Graphical evaluation in most cases a a : Not a primary characteristic : Attribute (qualitative) characteristic a b : Will be adjusted when fitting the bush into the housing bore; attribute characteristic : Blanking tool; tool checking by f — — — — — (yes) — — — — — no means of initial product acceptance with each order : Attribute (qualitative) characteristic f ISO : 01 7(E) Table (continued) Typ e of plain b earing Sub clause No (according to ISO 12301) 16 17 Quality characteris tic Thinwal led halfbear- Wrapp ed bush ing Un s pl it meta ll ic bu sh Solid p olymer bush T hrus t Sin- washer tered (ring bush and half) Flange diameter a b c d e ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) Distance between ( ye s) 19 Flange thickness Perpen(squareness) f — ( ye s) ( ye s) ( ye s) ( ye s) — 20 Geometric deviations b e a b e primar y ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) ( ye s) — — d ic u l a r ity o f fl a nge and to : Not a teristic and to : Not a characteristic and to : Measuring point a p r i m a r y ch a rac fl a n ge s 18 Remarks a b e s h a l l b e de fi ne d and to : Not a characteristic a b e primar y — — ( ye s) ( ye s) ( ye s) — , and : Not a characteristic c d e primar y Material quality characteristics Control of the material manufacturing processes depends on a large number of parameters which f statistical techniques in accordance with customer requirements i nvolve “pro ce s s -knowle dge” T he ma nu ac tu rer s l l de cide wh ich p a rame ters a re to b e che cke d u s i ng © ISO 2017 – All rights reserved ISO 12302:2017(E) ICS 1 00.1 Price based on pages © ISO 2017 – All rights reserved