1、BRITISH STANDARDBS EN ISO 6507-2:2005Metallic materials Vickers hardness test Part 2: Verification and calibration of testing machines The European Standard EN ISO 6507-2:2005 has the status of a British StandardICS 77.040.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g
2、48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 6507-2:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 January 2006 BSI 20 January 2006ISBN 0 580 47
3、588 3National forewordThis British Standard is the official English language version of EN ISO 6507-2:2005. It is identical with ISO 6507-2:2005. It supersedes BS EN ISO 6507-2:1998 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, Mechanical
4、testing of metals, to Subcommittee ISE/NFE/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-referencesThe British Standards which implement international or European publicat
5、ions referred to in this document may 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 necessa
6、ry provisions of a contract. Users are 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 interpr
7、etation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, p
8、ages ii to iv, pages 1 to 16, 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 publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 6507-2December 2005ICS 77
9、.040.10 Supersedes EN ISO 6507-2:1997 English VersionMetallic materials - Vickers hardness test - Part 2: Verificationand calibration of testing machines (ISO 6507-2:2005)Matriaux mtalliques - Essai de duret Vickers - Partie 2:Vrification et talonnage des machines dessai (ISO 6507-2:2005)Metallische
10、 Werkstoffe - Hrteprfung nach Vickers - Teil2: Prfung und Kalibrierung der Prfmaschinen (ISO 6507-2:2005)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 EuropeanSta
11、ndard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French,
12、German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, De
13、nmark, 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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPIS
14、CHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 6507-2:2005: EForeword This document (EN ISO 6507-2:2005) has been prepared by Technical Committee
15、 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 publication of an identical text or by endorseme
16、nt, at the latest by June 2006, and conflicting national standards shall be withdrawn at the latest by June 2006. This document supersedes EN ISO 6507-2:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement thi
17、s 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, Sweden, Switzerland and United Kingdom. Endorse
18、ment notice The text of ISO 6507-2:2005 has been approved by CEN as EN ISO 6507-2:2005 without any modifications. EN ISO 6507-2:2005Reference numberISO 6507-2:2005(E)INTERNATIONAL STANDARD ISO6507-2Third edition2005-12-15Metallic materials Vickers hardness test Part 2: Verification and calibration o
19、f testing machines Matriaux mtalliques Essai de duret Vickers Partie 2: Vrification et talonnage des machines dessai EN ISO 6507-2:2005ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 General conditions . 1 4 Direct verification 2 5 Indirect verification. 4 6 Intervals betwee
20、n verifications . 7 7 Verification report/calibration certificate . 8 Annex A (informative) Notes on diamond indenters 9 Annex B (informative) Uncertainty of measurement of the calibration results of the hardness testing machine. 10 Bibliography . 16 EN ISO 6507-2:2005iv Foreword ISO (the Internatio
21、nal 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 has been
22、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 electrotechnical standar
23、dization. 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 v
24、oting. 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 identifying any or all s
25、uch patent rights. ISO 6507-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This third edition cancels and replaces the second edition (ISO 6507-2:1997), which has been technically revised. ISO 6507 consists of the following parts,
26、 under the general title Metallic materials Vickers hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibration of reference blocks Part 4: Tables of hardness values EN ISO 6507-2:20051Metallic materials Vickers hardness test Part 2: Verification a
27、nd calibration of testing machines 1 Scope This part of ISO 6507 specifies a method of verification of testing machines for determining Vickers hardness in accordance with ISO 6507-1. It specifies a direct verification method for checking the main functions of the machine operation, and an indirect
28、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 independently for each method. This part of
29、 ISO 6507 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 doc
30、ument (including any amendments) applies. ISO 376, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial testing machines ISO 3878, Hardmetals Vickers hardness test ISO 6507-1:2005, Metallic materials Vickers hardness test Part 1: Test method ISO 6507-3, M
31、etallic materials Vickers hardness test Part 3: Calibration of reference blocks 3 General conditions Before a Vickers 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 be ch
32、ecked that: a) the plunger holding the indenter is capable of sliding in its guide; b) 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; EN ISO 6507-2:20052 d) if th
33、e measuring system is integral with the machine the change from removing the test force to measuring mode does not influence the readings, illumination does not affect the readings, the centre of the indentation is in the centre of the field of view, if necessary. The illumination device of the meas
34、uring microscope shall produce uniform lighting of the whole observed field and maximum contrast between the indentation and the surrounding surface. 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 th
35、is 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) calibration of the test force; b) verification of the indenter; c) calibration of the
36、measuring system; d) verification of the testing cycle. 4.2 Calibration of the test force 4.2.1 Each test force used within the working range of the testing machine shall be measured. Whenever applicable, this shall be done at not less than three positions of the plunger uniformly spaced throughout
37、its range of movement during testing. 4.2.2 Three readings shall be taken for each test force at each position of the plunger. Immediately before each reading is taken, the plunger shall have been moved in the same direction as during testing. 4.2.3 The test force shall be measured by one of the fol
38、lowing two methods: by means of an elastic 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 another method with the same accuracy. 4.2.4 Each measurement of the force shall be within the tolerances o
39、f the nominal value of the test force, as given in Table 1. EN ISO 6507-2:20053Table 1 Ranges of the test force, F N Tolerances % F W 1,961 1,0 0,098 07 u F 0,200 0,001 mm 0,002 mm NOTE The diagonal length of the indentation determines the necessary magnification V of the measuring system according
40、to the following condition: V d W 14 mm For indentation diagonals d 700 HV 5.4 When verifying testing machines using only one test force, three reference blocks shall be used, one in each of the ranges specified in 5.2. 5.5 On each reference block, five indentations shall be made and measured. The t
41、est shall be carried out in accordance with ISO 6507-1. 5.6 For special purposes, a hardness testing machine may be verified at one hardness value only, corresponding approximately to that of the tests to be made. 5.7 For each reference block, let d1, d2, d3, d4, d5be the arithmetic mean values of t
42、he measured lengths of the two diagonals of the indentations, arranged in increasing order of magnitude, and 123 4 55dddddd+= (1) 5.8 The repeatability of the testing machine, under the particular verification conditions, is determined by the difference 51rd d= (2) The repeatability, expressed as a
43、percentage of d , is calculated as: 51rel100ddrd= (3) The repeatability of the testing machine verified is not considered satisfactory unless it satisfies the conditions given in Table 4. EN ISO 6507-2:20056 Table 4 Repeatability of the testing machine max rrel, % r HV bHV 5 to HV 100 HV 0,2 to 225
44、HV 2,0a4,0a5,0a250 350 600 750 10 14 24 30 250 350 600 750 20 28 48 60 aor 0,001 mm, whichever is greater. bHV: Vickers hardness.5.9 The error, E, of the testing machine under the particular verification conditions is characterized by the difference: cE HH= (4) where 123 455HH H H HH+=(5) where H1,
45、H2, H3, H4, H5are the hardness values corresponding to d1, d2, d3, d4, d5; Hcis the specified hardness of the reference block used. The percent error, Erel, is calculated by the following equation: crelc100H HEH= (6) The maximum error of the testing machine, expressed as a percentage of the specifie
46、d hardness of the reference block, shall not exceed the values given in Table 5. EN ISO 6507-2:20057Table 5 Maximum permissible percentage error Erel, of the hardness testing machine Hardness, HV Hardness symbol 50 100 150 200 250 300 350 400 450 500 600 700 800 900 1 000 1 500 HV 0,1 HV 0,015 10 HV
47、 0,02 8 HV 0,025 8 10 HV 0,05 6 8 9 10 HV 0,1 5 6 7 8 8 9 10 10 11 HV 0,2 4 6 8 9 10 11 11 12 12 HV 0,3 4 5 6 7 8 9 10 10 11 11 HV 0,5 3 5 5 6 6 7 7 8 8 9 11 HV 1 3 4 4 4 5 5 5 6 6 6 8 HV 2 3 3 3 4 4 4 4 4 5 5 6 HV 3 3 3 3 3 3 4 4 4 4 4 5 HV 5 3 3 3 3 3 3 3 3 3 4 4 HV 10 3 3 3 3 3 3 3 3 3 3 3 HV 20
48、3 3 3 3 3 3 3 3 3 3 3 HV 30 3 3 2 2 2 2 2 2 2 2 2 HV 50 3 3 2 2 2 2 2 2 2 2 2 HV 100 3 2 2 2 2 2 2 2 2 2 NOTE 1 Values are not given when the length of the indentation diagonal is less than 0,020 mm. NOTE 2 For intermediate values, the maximum permissible error may be obtained by interpolation. NOTE
49、 3 The values for microhardness testing machines are based on a maximum permissible error of 0,001 mm or 2 % of the mean diagonal length of indentation, whichever is the greater. 5.10 The determination of the uncertainty of measurement of the calibration results of the hardness testing machine is given in Annex B. 6 Intervals between verifications The specifications for the direct verifications of hardness testing machines are given in Table 6. Indirect v
