EN ISO 6507-2-2018 en Metallic materials - Vickers hardness test - Part 2 Verification and calibration of testing machines.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Metallic materials - Vickers hardness testPart 2: Verification and calibration of testing machines (ISO 6507- 2:2018)BS EN ISO 6507-2:2018National forewordThis British Standard is the UK implementation of EN ISO 65072:2

2、018. It is identical to ISO 65072:2018. It supersedes BS EN ISO 65072:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/101/5, Indentation hardness testing.A list of organizations represented on this committee can be obtained on request to its

3、secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 84394 5ICS 77.040.10Compliance with a British Standard ca

4、nnot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 65072:2018EUROPEAN STANDARDNORME EUROPENNEEUR

5、OPISCHE NORMEN ISO 65072March 2018ICS 77.040.10 Supersedes EN ISO 65072:2005EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2018 CEN Ref. No. FprEN ISO 65072:2018: EAll rights of exploita

6、tion in any form and by any means reserved worldwide for CEN national MembersMetallic materials Vickers hardness test Part 2: Verification and calibration of testing machines (ISO 65072:2018)Matriaux mtalliques Essai de duret Vickers - Partie 2: Vrification et talonnage des machines dessai (ISO 6507

7、2:2018)Metallische Werkstoffe Hrteprfung nach Vickers Teil 2: berprfung und Kalibrierung der Prfmaschinen (ISO 65072:2018)English Version2BS ISO ENEN ISO 65072:2018 (E)European forewordThis document (EN ISO 65072:2018) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals

8、” in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” 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 endorsement, at the lat

9、est by September 2018, and conflicting national standards shall be withdrawn at the latest by September 2018.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent

10、rights.This document supersedes EN ISO 65072:2005.According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, F

11、ormer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of I

12、SO 65072:2018 has been approved by CEN as EN ISO 65072:2018 without any modification.65072:2018ISO 65072:2018Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 General conditions . 15 Direct verification . 25.1 General . 25.2 Calibration of the test force 25.3 Verification of

13、 the indenter 35.4 Calibration and verification of the diagonal measuring system . 45.5 Verification of the testing cycle . 55.6 Uncertainty of calibration/verification . 56 Indirect verification 56.1 General . 56.2 Test force and hardness levels . 56.3 Measurement of reference indentation . 56.4 Nu

14、mber of indentations 66.5 Verification result . 66.6 Repeatability . 66.7 Bias 66.8 Uncertainty of calibration/verification . 77 Intervals between verifications 78 Verification report/calibration certificate 78.1 Vickers testing machine 78.2 Vickers indenter . 8Annex A (informative) Uncertainty of t

15、he calibration results of the hardness testing system 9Bibliography .18 ISO 2018 All rights reserved iiiContents PageBS EN ISO 65072:2018ISO 65072:2018ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work

16、 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 committee. International organizations, governmental and non-governmen

17、tal, 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.The procedures used to develop this document and those intended for its further maintenance are described in the

18、ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibi

19、lity 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of p

20、atent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to co

21、nformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,

22、Subcommittee SC 3, Hardness testing.This fourth edition cancels and replaces the third edition (ISO 6507-2:2005), which has been technically revised.The main changes compared to the previous edition are as follows: all references of indentation diagonals, 700 HV6.3 Measurement of reference indentati

23、onOne of the reference indentations from the current calibration period on each reference block shall be measured. For each indentation, the difference between the mean measured value and the certified mean diagonal length shall not exceed greater than 0,001 mm or 1,25 % of the reference indentation

24、 length. If preferred, this check may instead be made on a similarlysized indentation in a different reference block with similar hardness. ISO 2018 All rights reserved 5BS EN ISO 65072:2018ISO 65072:20186.4 Number of indentationsOn each reference block, five indentations shall be made and measured.

25、 The test shall be carried out in accordance with ISO 65071. Only the calibrated surfaces of the test blocks are to be used for testing.6.5 Verification resultFor each reference block, let H1, H2, H3, H4, H5be the measured hardness arranged in increasing order of magnitude corresponding to the measu

26、red diagonals, d1, d2, d3, d4, d5, in decreasing order of magnitude. The mean hardness value, H , is calculated according to Formula (2) and the mean diagonal length, d , is calculated according to Formula (3):HHHHHH=+123455(2)dddddd=+123455(3)6.6 RepeatabilityThe relative repeatability of the testi

27、ng machine, rrel, expressed as a percentage of H is calculated according to Formula (4):rHHHrel=10051(4)The repeatability of the testing machine is satisfactory if (d1 d5) 0,001 mm. If (d1 d5) 0,001 mm, the testing machine is satisfactory if rrelis less than or equal to the percentages indicated in

28、Table 4.Table 4 Maximum permissible relative repeatabilityVickers hardness of the reference blockMaximum permissible relative HV repeatability of the testing machine,rrel%HVHV 5 to HV 100 HV 0,2 to 250 4,0 8,0 12,0NOTE Lower hardness materials often exhibit higher values of repeatability than those

29、for higher hardness materials.6.7 BiasThe bias, b, of the testing machine under the particular verification conditions is calculated according to Formula (5):bH=HCRM(5)where HCRMis the certified hardness of the reference block used.The percent bias, brel, is calculated according to Formula (6):bHHHr

30、elCRMCRM=100 (6)The maximum positive or negative bias of the testing machine, expressed as a percentage of the specified hardness of the reference block, shall not exceed the values given in Table 5.6 ISO 2018 All rights reservedBS EN ISO 65072:2018ISO 65072:2018Table 5 Maximum permissible percent H

31、V biasMean diagonal length, d mmMaximum permissible percent HV bias,brel, of the testing machine %HV0,02 d 13 months ago x x x aIn addition, it is recommended that the indenter be directly verified after 2 years of use.bDirect verification of these parameters may be carried out sequentially (until t

32、he machine passes indirect verification) and is not required if it can be demonstrated, for example, by tests with a reference indenter, that the indenter was the cause of the failure.8 Verification report/calibration certificate8.1 Vickers testing machineThe verification report/calibration certific

33、ate shall include the following information:a) a reference to this document, i.e. ISO 65072;b) the method of verification (direct and/or indirect);c) identification data of the hardness testing machine;d) means of verification (reference blocks, elastic proving devices, etc.);e) test force(s) verifi

34、ed;f) hardness values of reference blocks used;g) the verification temperature, if outside the range specified in 5.1.4; ISO 2018 All rights reserved 7BS EN ISO 65072:2018ISO 65072:2018h) all results obtained;i) the date of verification and reference to the verification institution;j) the uncertaint

35、y of the verification result.8.2 Vickers indenterThe verification report/calibration certificate shall include the following information:a) a reference to this document, i.e. ISO 65072;b) the indenter serial number;c) all results obtained;d) the date of verification and reference to the verification

36、 institution;e) the uncertainty of the verification result.8 ISO 2018 All rights reservedBS EN ISO 65072:2018ISO 65072:2018Annex A (informative) Uncertainty of the calibration results of the hardness testing systemA.1 GeneralMeasurement uncertainty analysis is a useful tool to help determine sources

37、 of error and to understand differences between measured values. This annex gives guidance on uncertainty estimation but the values derived are for information only, unless specifically instructed otherwise by the customer. The criteria specified in this document for the performance of the testing m

38、achine have been developed and refined over a significant period of time. When determining a specific tolerance that the machine needs to meet, the uncertainty associated with the use of measuring equipment and/or reference standards has been incorporated within this tolerance and it would therefore

39、 be inappropriate to make any further allowance for this uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all measurements made when performing a direct or indirect verification of the machine. In each case, it is simply the measured value resulting

40、 from the use of the specified measuring equipment and/or reference standards that is used to assess whether or not the machine complies with this document. However, there may be special circumstances where reducing the tolerance by the measurement uncertainty is appropriate. This should only be don

41、e by agreement of the parties involved.The metrological chain necessary to define and disseminate hardness scales is discussed in ISO 65071.A.2 Direct verification of the hardness testing machineA.2.1 Calibration of the test forceThe combined relative standard uncertainty of the test force calibrati

42、on is calculated according to Formula (A.1):uu uFFRS FHTM=+22(A.1)whereuFRSis the relative uncertainty of measurement of the force transducer (from the calibration certificate);uFHTMis the relative standard uncertainty of the test force generated by the hardness testing machine.The uncertainty of me

43、asurement of the reference instrument, force transducer, is indicated in the corresponding calibration certificate. The influence quantities, like temperature dependence, longterm stability, and interpolation deviation, ISO 2018 All rights reserved 9BS EN ISO 65072:2018ISO 65072:2018should be consid

44、ered for critical applications. Depending on the design of the force transducer, the rotational position of the transducer related to the indenter axis of the hardness testing machine should be considered.EXAMPLE Using the results shown in Table A.1 and the following information: uncertainty of meas

45、urement of the force transducer (from calibration certificate): UFRS= 0,12 % (k = 2), and calibration value of the force transducer: FRS= 294,2 N,the combined relative standard uncertainty of the test force calibration, uF, is calculated according to Formula (A.1) and as shown in Table A.2.In Table

46、A.1, the relative deviation is calculated according to Formula (A.2):FFFFijijrel, ,=RSRS(A.2)where Fi,jis the testforce measurement value in the ith height position of the jth measurement series.The relative standard uncertainty is calculated according to Formula (A.3):usFiFitnntFHTM,i= =,( ,)3132 (

47、A.3)where sFiis the standard deviation of the testforce indication values in the ith height position.Table A.1 Results of the test force calibrationNumber of height posi-tion (i) for test force calibrationSeries 1 Series 2 Series 3Mean valueStandard deviationRelative standard uncer-taintyValueRelati

48、ve devia-tionValueRelative devia-tionValueRelative devia-tionFi,1Frel,i,1Fi,2Frel,i,2Fi,3Frel,i,3 F isFiuFHTM,iN % N % N % N N 1 294,7 0,170 294,9 0,238 294,5 0,102 294,7 0,200 0,52 1032 293,9 0,102 294,5 0,102 294,6 0,136 294,3 0,379 0,98 1033 293,1 0,374 294,0 0,068 293,7 0,170 293,6 0,458 1,19 10

49、3In Table A.2, the uncertainty of the measurement of the test force is determined using the maximum value of relative standard uncertainty, uiFHTM, from Table A.1 (in this case, uFHTM,3).Table A.2 Calculation of the uncertainty of measurement of the test forceQuantityEstimated valueRelative limit valuesDistribution typeSymbolRelative standard uncertain-tySensitivity coefficientRelative uncertainty contributionXpxpapu(xp) cpup(F)Force transduce