SANS 6508-2-2009 Metallic materials - Rockwell hardness test Part 2 Verification and calibration of testing machines (scales A B C D E F G H K N T)《金属材料 洛氏硬度试验 第2部分 试验机器的验证和校准(等级A,.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 978-0-626-22670-1 SANS 6508-2:2009Edition 2ISO 6508-2:2005Edition 2SOUTH AFRICAN NATIONAL STANDARD Metallic materials Rockwell hardness test Part 2:

4、 Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) This national standard is the identical implementation of ISO 6508-2:2005 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lat

5、egan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 6508-2:2009 Edition 2 ISO 6508-2:2005 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 164, E

6、ngineering materials Mechanical testing of 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 6508-2:2003 (edition 1). Reference numberISO 6508

7、2:2005(E)ISO 2005INTERNATIONAL STANDARD ISO6508-2Second edition2005-12-15Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) Matriaux mtalliques Essai de duret Rockwell Partie 2: Vrification et talonnage des mac

8、hines dessai (chelles A, B, C, D, E, F, G, H, K, N, T) SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy,

9、 this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobes licensing policy. The ISO Central Sec

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11、nsure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please 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 uti

12、lized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing 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

13、 + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedSANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) ISO 2005 All rights reserved iiiContents Pag

14、e Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 General conditions . 1 4 Direct verification 2 5 Indirect verification. 5 6 Intervals between verifications . 8 7 Verification report/calibration certificate . 8 Annex A (normative) Repeatability of testing machines 9 Annex B (inf

15、ormative) Uncertainty of measurement of the calibration results of the hardness testing machine. 11 Bibliography . 18 SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) iv ISO 2005 All rights reservedForeword I

16、SO (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 out through ISO technical committees. Each member body interested in a subject for which a technical c

17、ommittee 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 electr

18、otechnical 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 Standards. Draft International Standards adopted by the technical committees are circulated to the m

19、ember 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 elements of this document may be the subject of patent rights. ISO shall not be held responsible for identi

20、fying any or all such patent rights. ISO 6508-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This second edition cancels and replaces the first edition (ISO 6508-2:1999), which has been technically revised. ISO 6508 consists of th

21、e following parts, under the general title Metallic materials Rockwell hardness test: Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) Part 3: Calibration of reference blocks (scales A, B, C

22、 D, E, F, G, H, K, N, T) SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) ISO 2005 All rights reserved vIntroduction Attention is drawn to the fact that, in this part of ISO 6508, the use of hardmetal for ba

23、ll indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls may be continued to be used if specified in a product specification, or by special agreement. SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing client

24、s of the SABS .SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 6508-2:2005(E) ISO 2005 All rights reserved 1Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing m

25、achines (scales A, B, C, D, E, F, G, H, K, N, T) 1 Scope This part of ISO 6508 specifies a method of verification of testing machines for determining Rockwell hardness (scales A, B, C, D, E, F, G, H, K, N, T) in accordance with ISO 6508-1. It specifies a direct method for checking the main functions

26、 of the machine operation and an indirect method suitable for the overall checking of the machine. The indirect method may be used on its own for periodic routine checking of the machine in service. If a testing machine is also to be used for other methods of hardness testing, it shall be verified i

27、ndependently for each method. This part of ISO 6508 is 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

28、 latest edition of the referenced document (including any amendments) applies. ISO 376:2004, Metallic materials Calibration of force-proving instruments used for verification of uniaxial testing machines ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic ma

29、terials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) ISO 6508-3:2005, Metallic materials Rockwell hardness test Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T) 3 General conditions Before a Rockwell hardness testing machine is v

30、erified, the machine shall be checked to ensure that it is properly set up in accordance with the manufacturers instructions: Especially it should be checked that: a) the plunger holding the indenter is capable of sliding in its guide; SANS 6508-2:2009This s tandard may only be used and printed by a

31、pproved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) 2 ISO 2005 All rights reservedb) the indenter-holder is firmly mounted in the plunger; c) the test force can be applied and removed without shock or vibration and in such a manner that the readings are not influenced. It sh

32、all be checked that the readings are not affected either by movements of the test piece or by deformation of the frame. When a device is supplied, which locks the test piece against the upper part of the frame, the locking force shall exceed the total test force. The influence of deformations may be

33、 checked by using a plunger with a spherical tip (diameter of at least 10 mm), instead of the indenter, bearing against the anvil through a spacer and using the locking device when it is supplied. The material of the plunger and of the spacer have a hardness of at least 60 HRC. The readings of the m

34、easuring system (with preliminary force applied) before application and after removal of the additional force shall not differ by more than 1,5 Rockwell units (without locking equipment) and 0,5 Rockwell units (with locking equipment). 4 Direct verification 4.1 General 4.1.1 Direct verification shou

35、ld be carried out at a temperature of (23 5) C. If the verification is made outside of 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:

36、a) calibration of the test force; b) verification of the indenter; c) calibration of the depth-measuring system; d) verification of the testing cycle. 4.2 Calibration of the test force 4.2.1 The preliminary test force F0(see 4.2.4) and each total test force F used (see 4.2.5) shall be measured, and,

37、 whenever applicable, this shall be done at not less than three positions of the plunger spaced throughout its range of movement during testing. The preliminary test force shall be held for at least 2 s. 4.2.2 Three readings shall be taken for each force at each position of the plunger. Immediately

38、before each reading is taken, the plunger shall be moved in the same direction as during testing. 4.2.3 The forces shall be measured by one of the following two methods: by means of a force proving device in accordance with ISO 376:2004, class 1, or by balancing against a force, accurate to 0,2 %, a

39、pplied by means of calibrated masses or by another method having the same accuracy. 4.2.4 The tolerance on the preliminary test force F0(before application and after removal of the additional test force F1) shall be 2,0 %. 4.2.5 The tolerance on the total test force F shall be 1,0 %. Each individual

40、 value of F shall be within this tolerance. SANS 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) ISO 2005 All rights reserved 34.3 Verification of the indenter 4.3.1 Diamond cone indenter (scales A, C, D, N) To v

41、erify the reliable performance of the conical indenter in conformance with this part of ISO 6508, a direct and an indirect verification shall be carried out. 4.3.1.1 Direct verification 4.3.1.1.1 The surfaces of the diamond cone and spherical tip shall be polished for a penetration depth of 0,3 mm a

42、nd shall blend in a truly tangential manner. Both surfaces shall be free from surface defects. 4.3.1.1.2 The verification of the shape of the indenter can be made by direct measurement or by measurement of its projection on a screen. The verification shall be made at not less than four equally space

43、d sections. 4.3.1.1.3 The diamond cone shall have an included angle of (120 0,35). Deviations from straightness of the generatrix of the diamond cone, adjacent to the blend, shall not exceed 0,002 mm over a minimum length of 0,4 mm. 4.3.1.1.4 The angle between the axis of the diamond cone and the ax

44、is of the indenter-holder (normal to the seating surface) shall not exceed 0,5. 4.3.1.1.5 The tip of the indenter shall be spherical. Its radius shall be determined from single values, measured in the axial section planes defined in 4.3.1.1.2. The distance between the concentric circles shall be no

45、more than 0,004 mm. Each single value shall be within (0,2 0,015) mm. The mean value out of at least four single values shall be within (0,2 0,01) mm. NOTE 1 The radius can be obtained by determining the intersection of two segments of the concentric circles. NOTE 2 The single value is the mean valu

46、e of the two radii of the concentric circles. Measurement with a collimator device is also available. In this case, the measurements should be carried out at least in four central angles and the central angle of 120 must be included. 4.3.1.2 Indirect verification The hardness values given by the tes

47、ting machine depend not only on the dimensions given in 4.3.1.1.3 and 4.3.1.1.5, but also on the surface roughness and the position of the crystallographic axes of the diamond, and the seating of the diamond in its holder. To examine this influence, the indirect verification of the indenter shall be

48、 performed on four reference blocks which shall be calibrated for the hardness levels given in Table 1 or on blocks giving equivalent total depths of indentation. Table 1 Hardness levels for different scales Scale Hardness Ranges HRC 23 20 to 26HRC 55 52 to 58HR45N 43 40 to 46 HR15N 91 88 to 94 SANS

49、 6508-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6508-2:2005(E) 4 ISO 2005 All rights reservedFor each block, the mean hardness value of three indentations made using the indenter to be verified shall not differ from the mean hardness value of the three indentations obtained with the indenter, calibrated in accordance with 4.5 of ISO 6508-3:2005 by more than 0,8 Rockwell units. The indentations made with the