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1、BRITISH STANDARD BS EN ISO 6508-2:2005 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) The European Standard EN ISO 6508-2:2005 has the status of a British Standard ICS 77.040.10 ? Licensed Copy: sheffieldun
2、sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6508-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 January 2006 BSI 10 January 2006 ISBN 0 580 47568 9 National foreword This British Standa
3、rd is the official English language version of EN ISO 6508-2:2005. It is identical with ISO 6508-2:2005. It supersedes BS EN ISO 6508-2:1999 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/N
4、FE/4/5, Indentation hardness testing, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may
5、be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users ar
6、e responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and
7、 keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1
8、 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy,
9、 (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6508-2 December 2005 ICS 77.040.10Supersedes EN ISO 6508-2:1999 English Version 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) (ISO 6508-
10、2:2005) Matriaux mtalliques - Essai de duret Rockwell - Partie 2: Vrification et talonnage des machines dessai (chelles A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:2005) Metallische Werkstoffe - Hrteprfung nach Rockwell - Teil 2: Prfung und Kalibrierung der Prfmaschinen (Skalen A, B, C, D, E, F, G,
11、 H, K, N, T) (ISO 6508-2:2005) This European Standard was approved by CEN on 14 December 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-da
12、te lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the
13、 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
14、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36
15、 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6508-2:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 6508-
16、2:2005) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in collaboration with Technical Committee ECISS/TC 1 “Steel - Mechanical testing“, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by
17、publication of an identical text or by endorsement, at the latest by June 2006, and conflicting national standards shall be withdrawn at the latest by June 2006. This document supersedes EN ISO 6508-2:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of th
18、e following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain,
19、 Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6508-2:2005 has been approved by CEN as EN ISO 6508-2:2005 without any modifications. EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference nu
20、mber ISO 6508-2:2005(E) INTERNATIONAL STANDARD ISO 6508-2 Second edition 2005-12-15 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) Matriaux mtalliques Essai de duret Rockwell Partie 2: Vrification et talonna
21、ge des machines dessai (chelles A, B, C, D, E, F, G, H, K, N, T) EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
22、 iii Contents Page 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 machine
23、s 9 Annex B (informative) Uncertainty of measurement of the calibration results of the hardness testing machine. 11 Bibliography. 18 EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organi
24、zation 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 has been establishe
25、d 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 electrotechnical standardization.
26、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 member bodies for voting. Pub
27、lication 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 identifying any or all such patent
28、 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 the following parts, under the
29、 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, D, E, F, G, H, K, N, T) EN
30、 ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction Attention is drawn to the fact that, in this part of ISO 6508, the use of hardmetal for ball indenters is considered to be the standard type of Rockwell indenter
31、 ball. Steel indenter balls may be continued to be used if specified in a product specification, or by special agreement. EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Su
32、n Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 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) 1 Scope This part of ISO 6508 specifies a method of verification of testing machines for determin
33、ing 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 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
34、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 independently for each method. This part of ISO 6508 is applicable to portable hardness testing machines. 2 Normative references The following refe
35、renced 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 (including any amendments) applies. ISO 376:2004, Metallic materials Calibration of force-proving instr
36、uments used for verification of uniaxial testing machines ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6508-1, Metallic materials 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
37、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 verified, the machine shall be checked to ensure that it is properly set up in accordance with the manufacturers instructions: Especially it should
38、 be checked that: a) the plunger holding the indenter is capable of sliding in its guide; EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 b) the indenter-holder is firmly mounted in the plunger; c) the test force can be
39、applied and removed without shock or vibration and in such a manner that the readings are not influenced. It shall 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 upp
40、er part of the frame, the locking force shall exceed the total test force. The influence of deformations may be 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 su
41、pplied. The material of the plunger and of the spacer have a hardness of at least 60 HRC. The readings of the measuring 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) an
42、d 0,5 Rockwell units (with locking equipment). 4 Direct verification 4.1 General 4.1.1 Direct verification should 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
43、for verification and calibration shall be traceable to national standards. 4.1.3 Direct verification involves: 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.
44、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, 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 fo
45、r at least 2 s. 4.2.2 Three readings shall be taken for each force at each position of the plunger. Immediately 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 forc
46、e proving device 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 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 additi
47、onal test force F1) shall be 2,0 %. 4.2.5 The tolerance on the total test force F shall be 1,0 %. Each individual value of F shall be within this tolerance. EN ISO 6508-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:36:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 4.3 Verificatio
48、n of the indenter 4.3.1 Diamond cone indenter (scales A, C, D, N) To verify 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 a
49、nd spherical tip shall be polished for a penetration depth of 0,3 mm and 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 spaced sections. 4.3.1.1.3 The diamond cone shall have an included angle of