1、February 2015Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 19.060; 77.040.10!%:“2292399www.din.deDDIN EN ISO 6506-3Metallic materials Brinell hardness test Part 3: Calibration of reference blocks (ISO 6506-3:2014);English version EN ISO 6506-3:2014,English translation of DIN EN ISO 6506-3:2015-02Metallische Werkstoffe Hrteprfung nach Brinell Teil 3: Kalib
3、rierung von Hrtevergleichsplatten (ISO 6506-3:2014);Englische Fassung EN ISO 6506-3:2014,Englische bersetzung von DIN EN ISO 6506-3:2015-02Matriaux mtalliques Essai de duret Brinell Partie 3: talonnage des blocs de rfrence (ISO 6506-3:2014);Version anglaise EN ISO 6506-3:2014,Traduction anglaise de
4、DIN EN ISO 6506-3:2015-02SupersedesDIN EN ISO 6506-3:2006-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 17 pages01.15 DIN EN ISO 6506-3:2015-02 2 A comma is used as the decimal marker. National foreword This document (EN ISO 6506-3:
5、2014) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals”, Subcommittee SC 3 “Hardness testing” (Secretariat: DIN, Germany) in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” (Secretariat: AFNOR, France) in ac
6、cordance with the agreement on technical cooperation between ISO and CEN (Vienna Agreement). The responsible German body involved in its preparation was the DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-01-41 AA Hrteprfung fr Metalle. DIN EN
7、 ISO 6506 consists of the following parts, under the general title Metallic materials Brinell hardness 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 The DIN Standards corresponding to the In
8、ternational Standards referred to in this document are as follows: ISO 376 DIN EN ISO 376 ISO 4287 DIN EN ISO 4287 ISO 6506-1 DIN EN ISO 6506-1 ISO 6506-2 DIN EN ISO 6506-2 Amendments This standard differs from DIN EN ISO 6506-3:2006-03 as follows: a) the Introduction has been deleted; b) in Subclau
9、se 3.4, requirements for the reference blocks in Table 1 have been revised with regard to the ball diameter; c) the test procedure has been rendered more precise; d) for the tolerances of the ball diameter, reference is now made to Part 2 of this standards series; the former Table 2 has been deleted
10、; e) the standard has been editorially revised. Previous editions DIN 51303: 1983-11 DIN EN 10003-3: 1995-01 DIN EN 10003-3 Supplement 1: 1995-01 DIN EN ISO 6506-3: 1999-10, 2006-03 DIN EN ISO 6506-3 Supplement 1: 1999-10 DIN EN ISO 6506-3:2015-02 3 National Annex NA (informative) Reference block de
11、sign (examples) 1 NA.1 Examples of reference block forms Figure NA.1 shows examples of reference block forms, including the arrangement and numbering of indentations. The triangular reference blocks (edge length preferably 70 mm, thickness at least 6 mm) are suitable for all Brinell methods of hardn
12、ess testing and are recommended for indentations with balls having a diameter of 1 1,0NOTE For hardness values less than 225 HBW, the maximum permissible value of non-uniformity can be 2,0 %.7.3 Methods for determining the uncertainty of measurement of hardness reference blocks are given in Annex A
13、and Reference 6.8 Marking8.1 Each reference block shall be marked with the following:a) arithmetic mean of the hardness values found in the block calibration, for example: 348 HBW 5/750;b) name or mark of the supplier or manufacturer;c) serial number;d) name or mark of the calibration agency;e) thic
14、kness of the block or an identifying mark on the test surface (see 3.6);f) year of calibration, if not indicated in the serial number.8.2 Any mark put on the side of the block shall be upright when the test surface is the upper face.7DIN EN ISO 6506-3:2015-02EN ISO 6506-3:2014 (E)8.3 Each delivered
15、reference block shall be accompanied by a document giving at least the following information:a) a reference to this part of ISO 6506 (i.e. ISO 6506-3);b) the identity of the block;c) the date of calibration;d) the arithmetic mean of the hardness values and its associated uncertainty and the value ch
16、aracterizing the non-uniformity of the block (see 7.1);e) information about the location of the reference indentation(s) and the orientations and values of the measured diameters, together with the mean measured diameter(s).9 ValidityThe hardness-reference block is only valid for the scale for which
17、 it was calibrated.The calibration validity should be limited to a duration of five years. Attention is drawn to the fact that, for Al- and Cu-alloys, the calibration validity should be reduced to two to three years.8DIN EN ISO 6506-3:2015-02 EN ISO 6506-3:2014 (E) Annex A (informative) Uncertainty
18、of the mean hardness value of reference blocksA.1 GeneralMeasurement uncertainty analysis is a useful tool to help determine sources of error and to understand differences between measured values. This annex gives guidance on uncertainty estimation but the values derived are for information only, un
19、less specifically instructed otherwise by the customer.The criteria specified in this part of ISO 6506 for the calibration requirements of the reference block have been developed and refined over a significant period of time. When determining a specific tolerance that the reference block needs to me
20、et, the uncertainty associated with the use of measuring equipment has been incorporated within this tolerance and it would therefore be inappropriate to make any further allowance for this uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all measur
21、ements associated with the manufacture and calibration of the reference blocks and also to all measurements made when performing a verification of the calibration machine. In each case, it is simply the measured value resulting from the use of the specified measuring equipment that is used to assess
22、 compliance with this part of ISO 6506.The metrological chain necessary to define and disseminate hardness scales is shown in ISO 6506-1:2014, Figure C.1.A.2 Direct verification of the calibration machineA.2.1 Measurement of the test forceSee ISO 6506-2:2014, Annex A.A.2.2 Calibration of the indenta
23、tion diameter measuring systemSee ISO 6506-2:2014, Annex A.A.2.3 Measurement of the indenterSee ISO 6506-2:2014, Annex A.A.2.4 Measurement of the test cycleSee ISO 6506-2:2014, Annex A.A.3 Indirect verification of the calibration machineNOTE In this annex, the index “CRM (Certified Reference Materia
24、l)” means, according to the definitions of the hardness testing standards, “Hardness Reference Block”.By the indirect verification with primary reference blocks, the overall function of the calibration machine is checked and the repeatability as well as the deviation of the calibration machine from
25、the actual hardness value are determined.9DIN EN ISO 6506-3:2015-02EN ISO 6506-3:2014 (E)The uncertainty of measurement of the indirect calibration of the calibration machine follows from the formula:uu uuuPx DCM CRMCRM CRMms=+21222(A.1)whereuCRM-Pis the calibration uncertainty of the primary refere
26、nce block according to the calibra-tion certificate for k = 1;uxCRM-1is the repeatability of the calibration machine;uCRM-Dis the hardness change of the primary reference block since its last calibration due to drift;umsis the standard uncertainty due to the resolution of the indentation diameter me
27、asur-ing system.EXAMPLE Primary reference block: (591,7 3,6) HBW 2,5/187,5Uncertainty of measurement of the primary reference block: uCRM-1= 1,8 HBW 2,5/187,5Time drift of the primary reference block: uCRM-D= 0Resolution of the indentation diameter measuring system: ms= 0,1 mTable A.1 Results of the
28、 indirect verificationNumberMeasured indentation diameterCalculated hardness valued Hmm HBW1 0,630 5max591,4min2 0,630 0 592,33 0,629 5min593,3max4 0,629 7 592,95 0,629 5 593,3Mean value H0,629 8 592,6Standard deviation sxCRM10,000 42 0,81HBW: Brinell hardnessutsn,xxCRMCRM=11041 (A.2)(t = 1,14 for n
29、 = 5) 10DIN EN ISO 6506-3:2015-02 EN ISO 6506-3:2014 (E) Table A.2 Budget of uncertainty of measurementQuantity Estimated valueStandard uncertainty of measurementDistribution typeSensitivity coefficientUncertainty contributionXixiu(xi) ciui(H)HBWuCRM-P591,7 HBW 1,8 HBW Normal 1,0 1,80uxCRM-1592,6 HB
30、W 0,41 HBW Normal 1,0 0,41Ums630,0 m 0,1 m Rectangular1 909,2 HBW/mm (see Note)0,06uCRM-D0,0 HBW 0,0 HBW Triangular 1,0 0,0Combined uncertainty of measurement, uCM1,85NOTE The sensitivity coefficient follows from:= +HdHdDDdDd2222(A.3)for H = 591,7 HBW, D = 2,5 mm, d = 0,630 0 mm.A.4 Uncertainty of m
31、easurement of reference blocksThe uncertainty of measurement of reference blocks follows from Formula (A.4):uuuxCRMCMCRM=+222(A.4)whereuCRMis the calibration uncertainty of reference blocks;uxCRM-2is the standard uncertainty due to the inhomogeneity of the hardness distribution of the reference bloc
32、k;uCMsee Formula (A.1).Table A.3 Determination of the inhomogeneity of the reference blockNumberMeasured indentation diameterCalculated hardness valued Hmm HBW1 0,630 4max591,01min2 0,630 1 591,603 0,629 4min592,92max4 0,629 6 592,535 0,629 7 592,34Mean value H0,629 8 592,08Standard deviation sxCRM-
33、20,000 40 0,7711DIN EN ISO 6506-3:2015-02EN ISO 6506-3:2014 (E)Standard uncertainty of CRM:utsnxxCRMCRM=22(A.5)with t = 1,14 and n = 5:uxCRM-2 = 0,39 HBW Table A.4 Uncertainty of measurement of the reference blockHardness of reference blockInhomogeneity of the reference blockUncertainty of measure-m
34、ent of the calibration machineExpanded calibration uncertainty of reference blockHCRMuxCRM-2uCMUCRMHBW HBW HBW HBW592,64 0, 39 1,85 3,8withUuuxCRMCMCRM 2=+222(A.6)12DIN EN ISO 6506-3:2015-02 EN ISO 6506-3:2014 (E) Bibliography1 ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Prof
35、ile method Terms, definitions and surface texture parameters2 Sawla A. Uncertainty of measurement in the verification and calibration of the force measuring systems of testing machines, Proceedings of the Asia-Pacific symposium on measurement of force, mass and torque (APMF), Tsukuba, Japan, November 20003 Wehrstedt A., PC File for Determination, Materialprfung 44 ( 2002) 3, pp. 64 716 Guidelines on the Estimation of Uncertainty in Hardness Measurements, EURAMET cg-16, Version 2.0, March 201113DIN EN ISO 6506-3:2015-02EN ISO 6506-3:2014 (E)
