SANS 6506-2-2009 Metallic materials - Brinell hardness test Part 2 Verification and calibration of testing machines《金属材料 布氏硬度试验 第2部分：试验机的验证和校准》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22673-2 SANS 6506-2:2009Edition 2ISO 6506-2:2005Edition 2SOUTH AFRICAN NATIONAL STANDARD Metallic materials Brinell hardness test Part 2:

4、Verification and calibration of testing machines This national standard is the identical implementation of ISO 6506-2:2005 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pret

5、oria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 6506-2:2009 Edition 2 ISO 6506-2:2005 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 164, Engineering materials Mechanical testing of

6、 metals, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in October 2009. This SANS document supersedes SANS 6506-2:2003 (edition 1). Reference numberISO 6506-2:2005(E)ISO 2005INTERNATIONAL STANDARD I

7、SO6506-2Second edition2005-12-15Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines Matriaux mtalliques Essai de duret Brinell Partie 2: Vrification et talonnage des machines dessai SANS 6506-2:2009This s tandard may only be used and printed by approved

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11、ase inform the Central Secretariat at the address given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writin

12、g from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedSANS 6506-2:

13、2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-2:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 General conditions 1 4 Direct verification.2 5 Indirect verif

14、ication4 6 Intervals between verifications 5 7 Verification report/calibration certificate 6 Annex A (informative) Uncertainty of measurement of the calibration results of the hardness testing machine7 Bibliography 13 SANS 6506-2:2009This s tandard may only be used and printed by approved subscripti

15、on and freemailing clients of the SABS .ISO 6506-2:2005(E) iv ISO 2005 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried ou

16、t 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 co

17、llaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International

18、Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the element

19、s of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6506-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This second edition cancels and repla

20、ces the first edition (ISO 6506-2:1999) which has been technically revised. ISO 6506 consists of the following parts, under the general title Metallic materials Brinell hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibration of reference blocks

21、 Part 4: Table of hardness values SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-2:2005(E) ISO 2005 All rights reserved vIntroduction Attention is drawn to the fact that in this part of ISO 6506, only the use of the

22、hardmetal ball indenter is specified. The designation of the Brinell hardness is HBW and should not be confused with the former designation HB, or HBS when a steel ball indenter was used. SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of

23、the SABS .SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 6506-2:2005(E) ISO 2005 All rights reserved 1Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machine

24、s 1 Scope This part of ISO 6506 specifies a method of verification and calibration of testing machines used for determining Brinell hardness in accordance with ISO 6506-1. It specifies a direct method for checking the main functions of machine operation and an indirect method suitable for the overal

25、l checking of the machine. The indirect method may be used independently for periodic routine checking of machine operation while in service. If a testing machine is also to be used for other methods of hardness testing, it should be verified independently for each method. This part of ISO 6506 is a

26、lso applicable to portable hardness testing machines. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includi

27、ng any amendments) applies. ISO 376:2004, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial testing machines ISO 6506-1:2005, Metallic materials Brinell hardness test Part 1: Test method ISO 6506-3, Metallic materials Brinell hardness test Part 3: Cali

28、bration of reference blocks ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method 3 General conditions Before a Brinell hardness testing machine is verified, the machine shall be checked to ensure that it is properly set up in accordance with the manufacturers instructions. Especi

29、ally, it should be checked that: a) the plunger holding the ball slides correctly in its guide; b) the ball-holder with a ball (from a lot verified in accordance with 4.3) is firmly mounted in the plunger; c) the test force is applied and removed without shock, vibration or overrun and in such a man

30、ner that the readings are not influenced; SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-2:2005(E) 2 ISO 2005 All rights reservedd) if the measuring system is integrated into the machine: the change from removing the

31、 test force to measuring mode does not influence the readings; the illumination does not affect the readings; and the centre of the indentation is in the centre of the field of view, if necessary. 4 Direct verification 4.1 General 4.1.1 Direct verification should be carried out at a temperature of (

32、23 5) C. If the verification is made outside this temperature range, this shall be reported in the verification report. 4.1.2 The instruments used for verification and calibration shall be traceable to national standards. 4.1.3 Direct verification involves: a) the calibration of the test force; b) t

33、he verification of the indenter ball; c) the calibration of the measuring system; d) the verification of the testing cycle. 4.2 Calibration of the test force 4.2.1 Each test force shall be measured within the working range of the testing machine. Whenever applicable, this shall be done at no less th

34、an three positions of the plunger uniformly spaced throughout its range of movement during testing. 4.2.2 Three measurements shall be made for each force at each position of the plunger. Immediately before each measurement is taken, the plunger shall be moved in the same direction as during testing.

35、 4.2.3 The force shall be measured by one of the following two methods: by means of a force-proving instrument in accordance with ISO 376:2004 class 1, or by balancing against a force, accurate to 0,2 %, applied by means of calibrated masses or another method with the same accuracy. 4.2.4 Each measu

36、rement of a force shall be within 1,0 % of the nominal test force, as defined in ISO 6506-1. 4.3 Verification of the indenter ball 4.3.1 The indenter consists of a ball and an indenter holder. The verification applies only to the ball. 4.3.2 For the purpose of verifying the size and the hardness of

37、the balls, a sample selected at random from a batch shall be tested. The balls verified for hardness shall be discarded. 4.3.3 The balls shall be polished and free from surface defects. SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of th

38、e SABS .ISO 6506-2:2005(E) ISO 2005 All rights reserved 34.3.4 The user shall either measure the balls to ensure that they meet the following requirements or shall obtain balls from a supplier certifying that the following conditions are met. 4.3.4.1 The diameter shall be determined by taking the me

39、an value of not less than three single values of diameter measured at different positions on the ball. No single value shall differ from the nominal diameter by more than the tolerance given in Table 1. Table 1 Tolerances for different ball diameters Ball diameter mm Tolerance mm 10 5 2,5 1 0,005 0,

40、004 0,003 0,003 4.3.4.2 The characteristics of the hardmetal balls shall be as follows. a) Hardness: The hardness shall be not less than 1 500 HV , when determined using a test force of at least 4,903 N, in accordance with ISO 6507-1. The hardmetal ball may be tested directly on this spherical surfa

41、ce or by sectioning the ball and testing on the ball interior. b) Density: = (14,8 0,2) g/cm3. The following chemical composition is recommended: tungsten carbide (WC) balance; total other carbides 2,0 %; cobalt (Co) 5,0 % to 7,0 %. 4.4 Calibration of the measuring system 4.4.1 The scale of the meas

42、uring system shall be graduated to permit estimation of the diameter of the indentation to within 0,5 %. 4.4.2 The measuring system shall be verified by measurements made on an object micrometer at a minimum of five intervals over each working range. The maximum error of each interval shall not exce

43、ed 0,5 %. 4.4.3 When measuring a projected area, the maximum error shall not exceed 1 % of the area. 4.4.4 Hand held microscopes should be calibrated in accordance to the procedure of this standard and the tolerances of the manufacturer. 4.5 Verification of the testing cycle The testing cycle shall

44、conform with the testing cycle specified in ISO 6506-1 and shall be timed with an uncertainty less than 1,0 s. SANS 6506-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-2:2005(E) 4 ISO 2005 All rights reserved5 Indirect verific

45、ation 5.1 Indirect verification should be carried out at a temperature of (23 5) C by means of reference blocks calibrated in accordance with ISO 6506-3. If the verification is made outside of this temperature range, this shall be reported in the verification report. The test and bottom surfaces of

46、the reference blocks and the surfaces of indenters shall not contain any additives or corrosion products. 5.2 On each reference block, the reference indentation shall be measured. For each block, the difference between the mean measured value and the certified mean diameter shall not exceed 0,5 %. 5

47、.3 The testing machine shall be verified for each test force and for each size of ball used. For each test force, at least two reference blocks shall be selected from the following hardness ranges: u 200 HBW 300 u HBW u 400 W 500 HBW The two reference blocks shall be taken from different hardness ra

48、nges, if possible. NOTE When the hardness test in question makes it impossible to reach the higher hardness range defined in the above-mentioned ranges (for 0,102 F/D2= 5 or 10), the verification may be carried out with only one reference block from the lower hardness range. 5.4 On each reference bl

49、ock, five indentations shall be uniformly distributed over the test surface and measured. The test shall be made in accordance with ISO 6506-1. 5.5 For each reference block, let d1, d2, d3, d4, d5be the mean values of the measured diameters of the indentations, arranged in increasing order of magnitude, and 123 455dd d d dd+= (1) 5.6 The repeatability r of the testing machine under the particular verification conditions is calculated as: 51rd d=. (2