1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Centre drills for centre holes with protecting chamfer Type BBS ISO 2540:2016National forewordThis British Standard is the UK implementation of ISO 2540:2016.The UK participation in its preparation was entrusted to Tech
2、nical Committee MTE/18, Tools tips and inserts for cutting applications.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 provisions of a contract. Users are responsible for its correct app
3、lication. The British Standards Institution 2016 Published by BSI Standards Limited 2016ISBN 978 0 580 83627 5ICS 25.100.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Com
4、mittee on 30 November 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 2540:2016 ISO 2016Centre drills for centre holes with protecting chamfer Type BForets centrer pour centres avec chanfrein de protection Type BINTERNATIONAL STANDARDISO2540Second edition2
5、016-11-01Reference numberISO 2540:2016(E)BS ISO 2540:2016ISO 2540:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or b
6、y 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 body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP
7、401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 2540:2016ISO 2540:2016(E)Foreword ivIntroduction v1 Scope 12 Designation 13 Dimensions . 1Annex A (normative) Dimensions for centre hole Type B and choice of dimensioning method . 3Annex
8、 B (informative) Relationship between designations in this International Standard and ISO 13399 (all parts) 5Bibliography 6 ISO 2016 All rights reserved iiiContents PageBS ISO 2540:2016ISO 2540:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of natio
9、nal 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. Internati
10、onal 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 intended
11、 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.iso
12、.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 will
13、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 meaning of ISO specific terms and expression
14、s 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.The committee responsible for this document is ISO/TC 29, Small tools, Subcom
15、mittee SC 2, Holding tools, adaptive items and interfaces.This second edition cancels and replaces the first edition (ISO 2540:1973), of which it constitutes a minor revision, notably with the addition of Annex B, which gives the relationship between the designations of this International Standard a
16、nd the ISO 13399 series.iv ISO 2016 All rights reservedBS ISO 2540:2016ISO 2540:2016(E)IntroductionThis International Standard relates to centre drills and deals only with centre drills for centre holes with protecting chamfer Type B. It is a continuation of ISO 866 and precedes ISO 2541. ISO 2016 A
17、ll rights reserved vBS ISO 2540:2016This page deliberately left blankCentre drills for centre holes with protecting chamfer Type B1 Scope This International Standard specifies the dimensions of centre drills for centre holes with protecting chamfer Type B.It covers only metric dimensions, regarded a
18、s the only recommended dimensions in the future for this type of drills.The flutes can be straight or spiral at the option of manufacturer.Unless otherwise stated, these drills are right-hand cutting.Annex A gives the recommended dimensions for the centre holes, Type B, which can be obtained by a ra
19、tional use of the centre drills listed in this International Standard.2 DesignationCentre drills shall be designated by the type (Type B in this case), the pilot diameter, d (first column of Table 1) and the shank diameter d1(second column of Table 1).EXAMPLE B 2,5/10.3 DimensionsFigure 1 Centre dri
20、ll Type BINTERNATIONAL STANDARD ISO 2540:2016(E) ISO 2016 All rights reserved 1BS ISO 2540:2016ISO 2540:2016(E)Table 1Dimensions in millimetresdad1d2l Lk12 h9 k12 max. min. max. min.1,0 4,0 2,12 1,9 1,3 37, 5 33,5(1,25) 5,0 2,65 2,2 1,6 42 381,6 6,3 3,35 2,8 2,0 47 432,0 8,0 4,25 3,3 2,5 52 482,5 10
21、,0 5,30 4,1 3,1 59 533,15 11,2 6,70 4,9 3,9 63 574,0 14,0 8,50 6,2 5,0 70 64(5,0) 18,0 10,60 7, 5 6,3 78 726,3 20,0 13,20 9,2 8,0 83 77(8,0) 25,0 17,00 11,5 10,1 103 9710,0 31,5 21,20 14,2 12,8 128 122aSizes in brackets should be avoided whenever possible.2 ISO 2016 All rights reservedBS ISO 2540:20
22、16ISO 2540:2016(E)Annex A (normative) Dimensions for centre hole Type B and choice of dimensioning methodFigure A.1 Method 1Figure A.2 Method 2The two methods of dimensioning are practically equivalent. One or the other of these methods may be used. ISO 2016 All rights reserved 3BS ISO 2540:2016ISO
23、2540:2016(E)Table A.1Dimensions in millimetresMethod 1 Method 2danominalDnominall1nominaltref.1,0 3,15 1,27 0,9(1,25) 4 1,60 1,11,6 5 1,99 1,42,0 6,3 2,54 1,82,5 8 3,20 2,23,15 10 4,03 2,84,0 12,5 5,05 3,5(5,0) 16 6,41 4,46,3 18 7, 36 5,5(8,0) 22,4 9,35 7,010,0 28 11,66 8,7aSizes in brackets should
24、be avoided whenever possible.Dimensions depend on the length of the centre drill. It should not, even in the case of frilling with re-sharpened centre drills, be less than the reference value given in Table A.1.4 ISO 2016 All rights reservedBS ISO 2540:2016ISO 2540:2016(E)Annex B (informative) Relat
25、ionship between designations in this International Standard and ISO 13399 (all parts)For relationship between designations in this International Standard and preferred symbols according to ISO 13399 (all parts), see Table B.1.Table B.1 Relationship between designations in this International Standard
26、 and ISO 13399 (all parts)Symbol in ISO 2540Reference in ISO 2540Property name in ISO 13399 (all parts)Symbol in ISO 13399 (all parts)Reference in ISO 13399 (all parts)dFigure 1Table 1cutting diameter DC 71D084653E57Fd1Figure 1Table 1connection diameter machine sideDCONMS 71EBDBF5060E6d1h9 Table 1to
27、lerance class connection diameter machine sideTCDCONMS 72719B2BD8041LFigure 1Table 1overall length OAL 71D078EB7C08660 max Figure 1 countersink angle SIGCSK 726E2FCD1A3C4120 at dimension d1Figure 1 step included angle STA 71DF151D6E547120 at dimension dFigure 1 point angle SIG 71DCCC4FEF366 ISO 2016
28、 All rights reserved 5BS ISO 2540:2016ISO 2540:2016(E)Bibliography1 ISO 866, Centre drills for centre holes without protecting chamfers Type A2 ISO 2541, Centre drills for centre holes with radius form Type R3 ISO 13399 (all parts), Cutting tool data representation and exchange6 ISO 2016 All rights
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