1、BSI Standards PublicationBS ISO 3290-2:2014Rolling bearings BallsPart 2: Ceramic ballsBS ISO 3290-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 3290-2:2014. Itsupersedes BS ISO 3290-2:2008 which is withdrawn.The UK participation in its preparation was
2、entrusted to TechnicalCommittee MCE/7, Rolling bearings.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Briti
3、sh Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 77273 3ICS 21.100.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2
4、014.Amendments issued since publicationDate Text affectedBS ISO 3290-2:2014 ISO 2014Rolling bearings Balls Part 2: Ceramic ballsRoulements Billes Partie 2: Billes de roulement en cramiqueINTERNATIONAL STANDARDISO3290-2Second edition2014-09-01Reference numberISO 3290-2:2014(E)BS ISO 3290-2:2014ISO 32
5、90-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part 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 intern
6、et or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso
7、.orgPublished in SwitzerlandBS ISO 3290-2:2014ISO 3290-2:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols 45 Requirements 45.1 Ball size 45.2 Quality of geometry and surface 45.3 Sorting accuracy and ball gauges 5
8、6 Material 57 Dimensions and tolerances . 57.1 General . 57.2 Shortened formats for nominal diameter identification . 5Annex A (normative) Method for assessment of deviation from spherical form 11Annex B (normative) Illustration of ball gauges and sorting principles12Annex C (informative) Examples o
9、f defect types and methods of inspection .14Bibliography .15BS ISO 3290-2:2014ISO 3290-2:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carri
10、ed 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. I
11、SO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different
12、 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.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be
13、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 will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).A
14、ny 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 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in
15、the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 4, Rolling bearings, Subcommittee SC 12, Ball bearings.This second edition cancels and replaces the first edition (ISO 3290-2:2008), which has been t
16、echnically revised.ISO 3290 consists of the following parts, under the general title Rolling bearings Balls: Part 1: Steel balls Part 2: Ceramic ballsiv ISO 2014 All rights reservedBS ISO 3290-2:2014INTERNATIONAL STANDARD ISO 3290-2:2014(E)Rolling bearings Balls Part 2: Ceramic balls1 ScopeThis part
17、 of ISO 3290 specifies requirements for finished silicon nitride balls for rolling bearings.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies.
18、 For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1132-1, Rolling bearings Tolerances Part 1: Terms and definitionsISO 4288, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of
19、 surface textureISO 5593, Rolling bearings VocabularyISO 12181-1, Geometrical product specifications (GPS) Roundness Part 1: Vocabulary and parameters of roundnessISO 15241, Rolling bearings Symbols for physical quantitiesISO 26602, Fine ceramics (advanced ceramics, advanced technical ceramics) Sili
20、con nitride materials for rolling bearing balls3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 1132-1, ISO 5593, and the following apply.3.1ball gaugeamount by which the mean diameter of ball lot should differ from the nominal ball diameter, this amou
21、nt being one of an established seriesNote 1 to entry: Each ball gauge is a whole multiple of the ball gauge interval established for the ball grade in question.Note 2 to entry: A ball gauge, in combination with the ball grade and nominal diameter, is considered as the most exact ball size specificat
22、ion to be used by a customer for ordering purposes.SOURCE: ISO 5593:1997, 05.04.09, modified Note 1 and Note 2 to entry have been added.3.2ball gauge intervalabsolute difference of two consecutive ball gauges ISO 2014 All rights reserved 1BS ISO 3290-2:2014ISO 3290-2:2014(E)3.3ball gradespecific com
23、bination of dimensional, form, surface roughness, and sorting tolerances for ballsNote 1 to entry: Ball grade is identified by the letter G and a number, e.g. G 20.SOURCE: ISO 5593:1997, 05.04.08, modified Note 1 to entry has been added.3.4ball lotdefinite quantity of balls manufactured under condit
24、ions presumed uniform and which is considered as an entitySOURCE: ISO 5593:1997, 05.04.053.5ball subgaugeamount of an established series of amounts, which is the nearest to the actual deviation from the ball gauge of a ball lotNote 1 to entry: Each ball subgauge is a whole multiple of the ball subga
25、uge interval established for the ball grade in question.Note 2 to entry: The ball subgauge, in combination with the nominal ball diameter and the ball gauge, is used by ball manufacturers to denote the mean diameter of a ball lot and is not generally used by customers for ordering purposes.SOURCE: I
26、SO 5593:1997, 05.04.11, modified Notes 1 and 2 to entry have been added.3.6ball subgauge intervalabsolute difference of two consecutive ball subgauges3.7deviation from spherical ball surfacevarious types of deviation from the perfect spherical ball surface, uniformly or non-uniformly distributed and
27、 repeated around the ball surfaceNote 1 to entry: The deviations to which limits can be attributed to are deviation from spherical form, surface defect, surface roughness, and waviness.3.7.1deviation from spherical formradial distance between the smallest circumscribed sphere and the greatest inscri
28、bed sphere, with their centres common to the least squares sphere centreNote 1 to entry: This definition supersedes ISO 5593:1997, 05.06.03.3.7.2surface defectelement, irregularity, or group of elements and irregularities of the real surface, unintentionally or accidentally caused during manufacture
29、, storage, handling, or use of the surfaceNote 1 to entry: These types of element or irregularity differ considerably from those constituting the surface roughness and are not considered during the measurement of the surface roughness.Note 2 to entry: The limits for surface defects are not specified
30、 in this part of ISO 3290.2 ISO 2014 All rights reservedBS ISO 3290-2:2014ISO 3290-2:2014(E)3.7.3surface roughnesssurface irregularities with relatively small spacings, which usually include irregularities resulting from the method of manufacture being used and/or other influencesNote 1 to entry: Th
31、ese irregularities are considered within the limits that are conventionally defined, e.g. within the limits of the sampling length.3.7.4wavinesssurface irregularities of random or periodical deviation from the ideal spherical formNote 1 to entry: Waviness shall be evaluated by default as velocity am
32、plitude.Note 2 to entry: In practice, the waviness components are separated from the real surface by a waviness analyser (filters).3.8deviation of a ball lot from ball gaugedifference between the mean diameter of a ball lot and the sum of the nominal ball diameter and the ball gaugeSOURCE: ISO 5593:
33、1997, 05.04.103.9hardnessmeasure of resistance to penetration as determined by a specific test methodNote 1 to entry: For ceramics balls, such a test method is the Vickers hardness test.3.10mean ball diameterarithmetical mean of the largest and the smallest of the single diameters of a ballSOURCE: I
34、SO 5593:1997, 05.04.033.11mean diameter of ball lotarithmetical mean of the mean diameters of the largest ball and the smallest ball in a ball lotSOURCE: ISO 5593:1997, 05.04.063.12nominal ball diameterdiameter value which is used for the general identification of a ball sizeSOURCE: ISO 5593:1997, 0
35、5.04.013.13single ball diameterdistance between two parallel planes tangential to the actual surface of a ballSOURCE: ISO 5593:1997, 05.04.023.14variation of ball diameterdifference between the largest and the smallest of the single diameters of a ballSOURCE: ISO 5593:1997, 05.04.04 ISO 2014 All rig
36、hts reserved 3BS ISO 3290-2:2014ISO 3290-2:2014(E)3.15variation of ball lot diameterdifference between the mean diameters of the largest ball and the smallest ball in a ball lotSOURCE: ISO 5593:1997, 05.04.074 SymbolsFor the purposes of this document, the symbols given in ISO 15241 and the following
37、 apply.The symbols (except those for tolerances) and the values given in Table 1, Table 2, and Table 3 denote nominal dimensions, unless specified otherwise.Dwnominal ball diameterDwmmean ball diameterDwmLmean diameter of ball lotDwssingle ball diameterG ball gradeRa arithmetical mean deviation of s
38、urface texture (see ISO 42871)S ball gaugeVDwLvariation of ball lot diameterVDwsvariation of ball diameterRSwdeviation from spherical formSdeviation of a ball lot from a ball gaugeNOTE S= DwmL (Dw+ S)5 Requirements5.1 Ball sizeThe preferred nominal ball diameters are given in Table 1 and, where appl
39、icable, the corresponding inch sizes are given for reference purposes only.5.2 Quality of geometry and surfaceRequirements for: variation of ball diameter (see Table 2); deviation from spherical form, (see Table 2); waviness (see Note 1); surface roughness (see Table 2); surface appearance (see Note
40、 2 and Note 3).4 ISO 2014 All rights reservedBS ISO 3290-2:2014ISO 3290-2:2014(E)Measurement of surface roughness shall be carried out in accordance with ISO 4288.NOTE 1 Limits and measuring methods for waviness are subject to agreement between the customer and supplier.NOTE 2 Local inhomogeneities
41、in colour, densification, pressing defects, snowflakes, etc. and cracks inherent to the material and its processing are subject to agreement between the customer and supplier.NOTE 3 Local defects originating from machining and handling are subject to agreement between the customer and supplier.5.3 S
42、orting accuracy and ball gaugesTable 3 comprises the applicable values for variation of ball lot diameter, gauge interval, preferred gauges, subgauge interval, and subgauges.6 MaterialThe balls shall be manufactured from silicon nitride material in accordance with ISO 26602.7 Dimensions and toleranc
43、es7.1 GeneralThe preferred nominal ball diameters are given in Table 1. Tolerances for form and surface roughness are given in Table 2. Sorting tolerances and ball gauges are given in Table 3.7.2 Shortened formats for nominal diameter identification7.2.1 Metric optionFor purchasing and other general
44、 administrative purposes, some users optionally identify nominal metric ball diameters with only three digits following the decimal comma.This option does not identify the diameter with adequate precision for manufacturing purposes and the full long diameter values given in Table 1 with four or five
45、 digits following the decimal comma to precisely identify the size shall always be used for gauge and subgauge sorting purposes to avoid any possibility of ambiguity.7.2.2 Imperial optionFor purchasing and other general administrative purposes, some users optionally continue to identify nominal ball
46、 diameters with imperial exact fraction or decimal sizes which carry no risk of ambiguity. Metric equivalents are sometimes also shown but not used as the primary administrative identifier.If this option is applied, gauge and subgauge diameter tolerances in micrometres shall be added to the imperial
47、 nominal reference size or its exact metric equivalent with four or five digits following the decimal comma according to Table 1 of this part of ISO 3290, for sorting purposes during manufacturing procedures. ISO 2014 All rights reserved 5BS ISO 3290-2:2014ISO 3290-2:2014(E)Table 1 Preferred nominal
48、 ball diametersNominal ball diameter DwmmCorresponding inch size(reference) in0,3 0,396 88 1/640,4 0,5 0,508 1/500,6 0,635 1/400,68 0,7 0,793 75 1/320,8 1 1,190 62 3/641,2 1,5 1,587 5 1/161,984 38 5/642 2,381 25 3/322,5 2,778 12 7/6 43 3,175 1/83,5 3,571 88 9/643,968 75 5/324 4,365 62 11/644,5 4,762
49、 5 3/165 5,159 38 13/645,5 5,556 25 7/ 325,953 12 15/646 6,35 1/46,5 6,746 88 17/6 46 ISO 2014 All rights reservedBS ISO 3290-2:2014ISO 3290-2:2014(E)Nominal ball diameter DwmmCorresponding inch size(reference) in7 7,143 75 9/327,5 7,540 62 19/647,937 5 5/168 8,334 38 21/648,5 8,731 25 11/329 9,128 12 23/649,5 9,525 3/89,921 88 25/6410 10,318 75 13/3210,5 11 11,112 5 7/1611,5 11,509 38 29/6411,906 25 15/3212 12,303 12 31/6412,5 12,7 1/213
