1、BSI Standards PublicationBS EN ISO 16859-3:2015Metallic materials Leebhardness testPart 3: Calibration of reference test blocksBS EN ISO 16859-3:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 16859-3:2015. The UK participation in its preparation was en
2、trusted to Technical Committee ISE/101/5, Indentation hardness testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl
3、ication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 78932 8 ICS 77.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Co
4、mmittee on 31 October 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 16859-3 October 2015 ICS 77.040.10 English Version Metallic materials - Leeb hardness test - Part 3: Calibration of reference test blocks (ISO
5、 16859-3:2015) Matriaux mtalliques - Essai de duret Leeb - Partie 3 : Etalonnage des blocs de rfrence (ISO 16859-3:2015) Metallische Werkstoffe - Hrteprfung nach Leeb - Teil 3: Kalibrierung von Hrtevergleichsplatten (ISO 16859-3:2015) This European Standard was approved by CEN on 10 July 2015. CEN m
6、embers 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-date lists and bibliographical references concerning such national standards may be obtained on applic
7、ation to the CEN-CENELEC Management Centre 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 responsibility of a CEN member into its own language and notified to the CEN-CENELEC Mana
8、gement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi
9、a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marni
10、x 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 16859-3:2015 EBS EN ISO 16859-3:2015EN ISO 16859-3:2015 (E) 3 European foreword This document (EN ISO 16859-3:2015) has been prepared by Technical Commi
11、ttee ISO/TC 164 “Mechanical testing of metals” 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 a
12、n identical text or by endorsement, at the latest by April 2016, and conflicting national standards shall be withdrawn at the latest by April 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be he
13、ld responsible for identifying any or all such patent rights. According to the CEN-CENELEC 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, Estoni
14、a, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The te
15、xt of ISO 16859-3:2015 has been approved by CEN as EN ISO 16859-3:2015 without any modification. BS EN ISO 16859-3:2015ISO 16859-3:2015(E)Foreword iv1 Scope . 12 Normative references 13 Manufacture of reference test blocks . 14 Calibration machine 24.1 General . 24.2 Traceability 24.3 Requirements o
16、n calibration machines . 24.4 Calibration of calibration machines 35 Calibration procedure . 46 Number of test indentations 47 Uniformity of hardness 48 Marking 69 Validity 6Annex A (normative) Requirements for Leeb hardness calibration machines 7Annex B (informative) Measurement uncertainty of refe
17、rence test block . 8Annex C (informative) Examples of reference test block .12Bibliography .13 ISO 2015 All rights reserved iiiContents PageBS EN ISO 16859-3:2015ISO 16859-3:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
18、 (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 committee. International organizations,
19、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.The procedures used to develop this document and those intended for its further mai
20、ntenance are described in the 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).Att
21、ention 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. Details of any patent rights identified during the development of the document will be in the Introducti
22、on and/or on the ISO list of patent 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 meaning of ISO specific terms and expressions related to conform
23、ity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary Information The committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness
24、testing.ISO 16859 consists of the following parts, under the general title Metallic materials Leeb hardness test: Part 1: Test method Part 2: Verification and calibration of the testing devices Part 3: Calibration of reference test blocksiv ISO 2015 All rights reservedBS EN ISO 16859-3:2015INTERNATI
25、ONAL STANDARD ISO 16859-3:2015(E)Metallic materials Leeb hardness test Part 3: Calibration of reference test blocks1 ScopeThis part of ISO 16859 specifies a method for the calibration of reference test blocks that are used for the indirect verification of Leeb hardness testers according to ISO 16859
26、-2 and for the periodic checking according to ISO 16859-1.The procedures necessary to ensure metrological traceability of the calibration machine are also specified.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable f
27、or its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 16859-1, Metallic materials Leeb hardness test Part 1: Test methodISO 16859-2, Metallic materials Leeb hardness test
28、Part 2: Verification and calibration of the testing devicesISO/IEC 17025, General requirements for the competence of testing and calibration laboratories3 Manufacture of reference test blocks3.1 The block shall be specially manufactured for use as a reference test block.Attention is drawn to the nee
29、d to use a manufacturing process which will give the necessary homogeneity, stability of texture and uniformity of surface hardness.3.2 The uniformity of the metallic reference test block shall meet the requirements specified in 7.2 and Table 3.3.3 The impact nature of a Leeb test requires a referen
30、ce test block with a minimum mass and thickness, as specified in Table 1.NOTE Examples of common dimensions of reference test blocks are specified in Annex C. ISO 2015 All rights reserved 1BS EN ISO 16859-3:2015ISO 16859-3:2015(E)Table 1 Mass and thickness requirements of reference test blockType of
31、 impact devicesMinimum thicknessMinimum diameterMinimum massmm mm kgD, DL, D+15, S, E, C 33 85 2,7G 65 115 6,03.4 The reference test blocks shall be free of magnetism prior to calibration.3.5 The maximum deviation from surface flatness of the top and bottom surfaces shall not exceed 0,01 mm. The sur
32、faces of the blocks shall not be convex.The maximum deviation from parallelism of the top and bottom surfaces shall not exceed 0,02 mm per 50 mm.3.6 The test surfaces shall be free from damage, such as notches, scratches, oxide layers, etc., which interfere with the mechanics of the indentation proc
33、ess.The mean surface roughness, Ra, 2of the test surface(s) shall not exceed 0,1 m. The sampling length, l, is 0,80 mm (see ISO 4287:1997, 3.1.9).3.7 To provide evidence that no material is removed from the test surface(s) of the reference test block subsequent to calibration, the thickness at the t
34、ime of calibration shall be marked on the test surface(s) or printed on the calibration certificate to an accuracy of 0,1 mm. Alternatively, a mark shall be placed on both the top and bottom surfaces, see 8.1 e).4 Calibration machine4.1 GeneralIn addition to fulfilling the general conditions specifi
35、ed in ISO 16859-2:2015, Clause 3, the calibration machine shall also meet the requirements given in 4.2 to 4.4.4.2 Traceability4.2.1 Leeb primary hardness standard machines owned by national level institutions are used to calibrate primary reference test blocks in Leeb hardness for accredited Leeb h
36、ardness calibration laboratories according to ISO/IEC 17025.4.2.2 The instruments used for the verification and calibration of the Leeb hardness calibration machine shall be traceable to national standards.NOTE A four-level structure of the metrological chain is necessary to define and disseminate h
37、ardness scales. The metrological chain of hardness values obtained by the Leeb method is defined in ISO 16859-1:2015, Figure C.1.4.3 Requirements on calibration machines4.3.1 Requirements on Leeb hardness calibration machines are given in Annex A.4.3.2 The resolution of Leeb hardness calibration mac
38、hines shall be equal to or better than 1,0 HL.2 ISO 2015 All rights reservedBS EN ISO 16859-3:2015ISO 16859-3:2015(E)4.4 Calibration of calibration machines4.4.1 Leeb hardness calibration machines shall be calibrated at an interval of 700 1,0 1,0DL, S850 1,0 1,0C, E750 1,0 1,0G600 1,0 1,0aHLD for im
39、pact devices D, HLD+15 for impact devices D+15, HLDL for impact devices DL, HLS for impact devices S, HLC for impact devices C, HLE for impact devices E, HLG for impact devices G.Indirect calibration comprises at least 10 readings on each reference test block.4.4.4 Calculation of error and repeatabi
40、lity of indirect calibration:HnHn=11i(1)whereH is the Leeb hardness mean value;Hiis the single Leeb hardness reading.bnHHnHiCRM=11(2)whereHCRMis the Leeb hardness of primary reference test block;bHis the error of Leeb hardness. ISO 2015 All rights reserved 3BS EN ISO 16859-3:2015ISO 16859-3:2015(E)I
41、n indirect calibration, requirements concerning the limiting error of Leeb hardness are met whenGbHuHH CRM+() (3)whereGHis the limiting error of Leeb hardness (see Table 2);uCRMis the calibration uncertainty of primary reference test blocks according to the calibration certificate for k = 1.Standard
42、 deviation, sHsHHninH=()121(4)Variation coefficient, VHVsHHH=100% (5)In indirect calibration, requirement concerning the minimum repeatability, WH, (see Table 2) of Leeb hardness are met when:WVHH (6)where WHis the minimum repeatability of Leeb hardness (see Table 2).5 Calibration procedure5.1 Refer
43、ence test blocks are calibrated at a temperature of (23 5) C using Leeb hardness calibration machines conforming to Clause 4, using the general procedure described in ISO 16859-1.During calibration, thermal drift shall not exceed 1 C.5.2 Reference test blocks are placed on a rigid steel plate of min
44、imum thickness of 45 mm and minimum mass of 45 kg, and whose contact surface has been ground to a flatness of 0,01 mm or better. The reference test block is coupled to steel plate using a thin plastic film (thickness 700 1,0DL, S850 1,0C, E750 1,0G600 1,0aHLD for impact devices D, HLD+15 for impact
45、devices D+15, HLDL for impact devices DL, HLS for impact devices S, HLC for impact devices C, HLE for impact devices E, HLG for impact devices G.7.3 Estimation of measurement uncertainty for reference test blocks is given in Annex B. ISO 2015 All rights reserved 5BS EN ISO 16859-3:2015ISO 16859-3:20
46、15(E)8 Marking8.1 Reference test blocks shall at least hold the following marks (preferably in form of an engraving on the edge of the test surface):a) arithmetic mean value from Leeb hardness calibration incl. specification of device type, e.g. 799 HLD;b) name or mark of manufacturer or supplier of
47、 reference test block;c) serial number;d) name or mark of calibration agency;e) thickness of reference test block or markings on both test surfaces, respectively (see 3.7);f) year of calibration, if not indicated in the serial number.8.2 The mark for test surface A (B) that is put on the side of the
48、 block shall be upright when the test surface A (B) is the upper face.8.3 Reference test blocks shall hold accompanying documentation (a calibration certificate) providing the following information:a) a reference to this part of ISO 16859 , i.e. ISO 16859-3;b) identification of reference test block;
49、c) single hardness values, arithmetic means and variation coefficients of reference test block;d) measurement uncertainty of calibration;e) date of calibration/date of issue.9 ValidityValidity of a reference test block is limited to the testing conditions and for the impact device type used during calibration.Validity of the calibration should be limited to 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.6 ISO 2015 All righ
