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1、BRITISH STANDARD BS EN ISO 6506-2:2005 Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines The European Standard EN ISO 6506-2:2005 has the status of a British Standard ICS 77.040.10 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+0
2、0:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6506-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 13 January 2006 BSI 13 January 2006 ISBN 0 580 47563 8 National foreword This British Standard is the official English language versio
3、n of EN ISO 6506-2:2005. It is identical with ISO 6506-2:2005. It supersedes BS EN ISO 6506-2:1999 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/5, Indentation hardness testing, whic
4、h 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 be found in the BSI Catalogue under the se
5、ction 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 are responsible for its correct application.
6、 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 keep UK interests informed; monitor relat
7、ed 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 to 13 and a back cover. The BSI copyright
8、 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 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS
9、O 6506-2 December 2005 ICS 77.040.10Supersedes EN ISO 6506-2:1999 English Version Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines (ISO 6506-2:2005) Matriaux mtalliques - Essai de duret Brinell - Partie 2: Vrification et tallonage des machines des
10、sai (ISO 6506- 2:2005) Metallische Werkstoffe - Hrteprfung nach Brinell - Teil 2: Prfung und Kalibrierung der Prfmaschinen (ISO 6506- 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
11、conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date 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 t
12、hree official versions (English, French, German). A version in any other language made by translation under the 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
13、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, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STAND
14、ARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 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 6506-2:2005: E Licensed Copy: sheffieldun sheff
15、ieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 6506-2:2005) 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
16、 of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by 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
17、 ISO 6506-2:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
18、 Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6506-2:2005 has been approved by CEN as EN ISO 6506-2:2005 without any modifications. EN ISO 6506-2:2005 Licensed
19、 Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 6506-2:2005(E) INTERNATIONAL STANDARD ISO 6506-2 Second edition 2005-12-15 Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines Matriau
20、x mtalliques Essai de duret Brinell Partie 2: Vrification et talonnage des machines dessai EN ISO 6506-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006,
21、Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references1 3 General conditions 1 4 Direct verification.2 5 Indirect verification4 6 Intervals between verifications 5 7 Verification report/calibration certificate 6 Annex A (informative) Uncertainty of m
22、easurement of the calibration results of the hardness testing machine7 Bibliography13 EN ISO 6506-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide fede
23、ration 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 established has the right to be represented on that commi
24、ttee. 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. International Standards are drafted in accordan
25、ce 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. Publication as an International Standard requires
26、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 rights. ISO 6506-2 was prepared by Technical C
27、ommittee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This second edition cancels and replaces 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 hardne
28、ss test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibration of reference blocks Part 4: Table of hardness values EN ISO 6506-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction
29、Attention is drawn to the fact that in this part of ISO 6506, only the use of the 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. EN ISO 6506-2:2005 Licensed Co
30、py: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Metallic materials Brinell hardness test Part 2: Verification and calibration of testing
31、machines 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
32、 overall 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 65
33、06 is also 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 (
34、including 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
35、3: Calibration 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.
36、 Especially, 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 suc
37、h a manner that the readings are not influenced; EN ISO 6506-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 d) if the measuring system is integrated into the machine: the change from removing the test force to measuring mode does n
38、ot 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 (23 5) C. If the verification is made
39、 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) the verification of the indenter ball
40、; 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 than three positions of the plunger un
41、iformly 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. 4.2.3 The force shall be measured b
42、y 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 measurement of a force shall be within 1,
43、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 the balls, a sample selected at rand
44、om 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. EN ISO 6506-2:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 12:41:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 4.3.4 The user shall e
45、ither 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 mean value of not less than three single values of diameter measured at different
46、 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 0,004 0,003 0,003 4.3.4.2 The characteristics of the hardmetal balls shall be as
47、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 surface or by sectioning the ball and testing on the ball interior. b) Density: = (1
48、4,8 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 measuring system shall be graduated to permit estimation of the diameter of the ind
49、entation 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 exceed 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 stand