1、BSI Standards PublicationBS ISO 11531:2015Metallic materials Sheet andstrip Earing testBS ISO 11531:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11531:2015.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/101/2, Ductility
2、testing.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 British Standards Institution 2015.Published by BSI S
3、tandards Limited 2015ISBN 978 0 580 81120 3ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publica
4、tionDate T e x t a f f e c t e dBS ISO 11531:2015 ISO 2015Metallic materials Sheet and strip Earing testMatriaux mtalliques Tles et bandes Essai de corneINTERNATIONAL STANDARDISO11531Second edition2015-11-01Reference numberISO 11531:2015(E)BS ISO 11531:2015ISO 11531:2015(E)ii ISO 2015 All rights res
5、ervedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll 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 internet or an int
6、ranet, 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 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww
7、.iso.orgBS ISO 11531:2015ISO 11531:2015(E)Foreword iv1 Scope . 12 Symbols and their meanings 13 Principle 24 Test equipment. 35 Test piece 36 Procedure. 47 Interpretation of results . 58 Test report . 5 ISO 2015 All rights reserved iiiContents PageBS ISO 11531:2015ISO 11531:2015(E)ForewordISO (the I
8、nternational Organization 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
9、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 of electrotechnica
10、l 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 approval criteria needed for the different types of ISO documents should be noted. This document was drafted in a
11、ccordance 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 the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Det
12、ails 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).Any trade name used in this document is information given for the convenience of users and does not constitute an e
13、ndorsement.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 the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee res
14、ponsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee SC 2, Ductility testing.This second edition cancels and replaces the first edition (ISO 11531:1994), of which it constitutes a minor revision.iv ISO 2015 All rights reservedBS ISO 11531:2015INTERNATIONAL STANDARD IS
15、O 11531:2015(E)Metallic materials Sheet and strip Earing test1 ScopeThis International Standard specifies a method for determining the ear height of metal sheet and strip of nominal thickness from 0,1 mm to 3 mm after deep drawing.2 Symbols and their meaningsThe meanings of the symbols used in the e
16、aring test are given in Table 1 and illustrated in Figures 1 and 2.Table 1 SymbolsSymbol Meaning Unitsa Thickness of test piece mmd1Diameter of punch mmR1Corner radius of punch mmd2Inside diameter of die mmR2Inside corner radius of die mmdbDiameter of circular blank mmhtDistance between outside bott
17、om of cup and any ear peakmmhvDistance between outside bottom of cup and any ear valleymmht,maxMaximum value of htmmhv,minMinimum value of hvmmhtMean value of htmmhvMean value of hvmmheMean ear height mmhe,maxMaximum ear height mmNear peaksNumber of ear peaks Near valleysNumber of ear valleys Z Ear
18、height expressed as a percentage %RaSurface roughness parameter: arithmetic mean devia-tion of profilem ISO 2015 All rights reserved 1BS ISO 11531:2015ISO 11531:2015(E)Figure 1 Schematic section of cupKey1 punch2 blankholder3 die4 direction of blankholder forceFigure 2 Schematic diagram of test equi
19、pment3 PrincipleCylindrical cups are drawn from circular blanks taken from metal sheets or strips, and the height of any earing produced by this process is measured.2 ISO 2015 All rights reservedBS ISO 11531:2015ISO 11531:2015(E)4 Test equipment4.1 The general arrangement of the test equipment is gi
20、ven in Figure 2. The punch shall be capable of moving along the central axis of the die and blankholder and the blank. The equipment shall be such that ironing of ears due to the blankholder force and/or due to insufficient clearance between the punch and die is avoided and such that the cup can be
21、removed without damaging the ears.4.2 The machine shall be capable of controlling the speed of drawing and the blankholder force.4.3 The machine shall be equipped with a device for positioning the blank concentrically with the central axis of the machine.The blank-positioning device is not required
22、if the blank is produced as part of the cup-forming process.4.4 The dimensions of the punch and die shall be chosen as a function of the sheet thickness in accordance with Table 2, unless otherwise specified in the product standard or by agreement.The punch and die dimension combinations given in Ta
23、ble 2 are general and may not be ideal for all materials due to the influence of the clearance between the punch and die. lt is recommended that the product standard specify the combinations required for each product.4.5 The die, the blankholder and the punch shall be sufficiently rigid so as not to
24、 deform appreciably during the test. The Vickers hardness of the working surfaces of the die, the blankholder and the punch shall be at least 750 HV 30. The surfaces (of the die, the blankholder and the punch) which contact the test piece shall be polished. The roughness value Ra, of the surfaces sh
25、all be in accordance with Table 2.Table 2 Punch and die dimensionsThickness of test pieceInside diameter of die Inside radius of die Surface roughnessa d2R2(maximum)for d1= 33 for d1= 50 for d1= 33 for d1= 50 Ramm mm mm mm mm m0,1 a 0,2 33,44 50,4420020,25020,0,10,2 a 0,4 33,88 50,8825002,+30002,+ 0
26、,10,4 a 0,8 34,76 51,7635002,+ 4,5 0,1 0,80,8 a 1,6 36,52 53,5250002,+ 6,5 0,1 0,81,6 a 3,0 39,60 56,6070002,+90020,1,6Punch radius R1will be 3,3 mm 0,05 mm for punch diameter of 33 mm, and 5,0 mm 0,05 mm for punch diameter 50 mm.5 Test piece5.1 Circular blanks are used as test pieces. The drawing r
27、atio, i.e. the ratio of blank diameter to punch diameter, shall be as large as possible without any risk of tearing at the bottom of the cup. For a test series or comparative tests, the same drawing ratio shall be the same in all cases. A drawing ratio of 1,8 has been found satisfactory. ISO 2015 Al
28、l rights reserved 3BS ISO 11531:2015ISO 11531:2015(E)5.2 The test piece shall be free of burrs on the edges which would interfere with the test.5.3 Before testing, the test piece shall not be subjected to any hammering or hot or cold working.6 Procedure6.1 In general, the test shall be carried out a
29、t ambient temperature within the limits of 10 C and 35 C.Tests performed under controlled conditions shall be carried out at a temperature of 23 C 5 C.6.2 Determine the thickness of the test piece to the nearest 0,01 mm and select the appropriate punch and die in accordance with 4.4.6.3 Before testi
30、ng, coat the two faces of the test piece lightly and uniformly with lubricant as specified in the relevant standard or by agreement. The lubricant will depend on the nature of the material.6.4 Position the blank concentrically between the blankholder and the die. Apply the blankholder force that is
31、just sufficient to prevent wrinkling of the flange.NOTE If it is not known what blankholder force is required to achieve this, it will have to be found by trial and error. The following values are provided for guidance for the first attempt:Diameter of punch Aluminium Steel33 mm 1 000 N 2 000 N50 mm
32、 2 000 N 4 000 N(See also 4.1.)6.5 Bring the punch into contact with the test piece and form the cup without a flange.6.6 All non-concentric cups and those having irregular deformations or other faults shall be rejected.6.7 Measure the height of each ear peak htand each ear valley hvon the cup with
33、an accuracy of 0,05 mm.6.8 Record the orientation of the ears with respect to the direction of rolling of the sheet.4 ISO 2015 All rights reservedBS ISO 11531:2015ISO 11531:2015(E)7 Interpretation of resultsFrom the measurements made, the following parameters can be determined.7.1 Mean value of the
34、ear peak htand the ear valley hv:hhhhNtt1 t2 t3ear peaks=+.hhhhNvvvv3ear valleys=+12.7.2 Mean ear height:hhhetv=7.3 Maximum ear height:he,max= ht,max- hv,min7.4 Ear height expressed as a percentage:Zhh=ev100It should be rounded to nearest 0,1 %, if not otherwise specified in product standards.8 Test
35、 report8.1 The test report shall include the following information:a) a reference to this International Standard;b) all details necessary for identification of the test piece;c) the thickness and diameter of the blank;d) the diameter of the punch and that of the die;e) the punch speed;f) the number
36、of ears and their orientation;g) the results from Clause 7 as required by the relevant standard or by agreement.8.2 The test report may also include the following information:a) the blankholder force;b) the type of lubricant used;c) the non-mandatory results from Clause 7. ISO 2015 All rights reserv
37、ed 5BS ISO 11531:2015ISO 11531:2015(E) ISO 2015 All rights reservedICS 77.040.10Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal
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