1、BSI Standards PublicationBS EN ISO 16859-2:2015Metallic materials Leebhardness testPart 2: Verification and calibration of thetesting devicesBS EN ISO 16859-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO16859-2:2015.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee ISE/101/5, Indentation hardness testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its cor
3、rectapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 78931 1ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strateg
4、y Committee 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 16859-2 October 2015 ICS 77.040.10 English Version Metallic materials - Leeb hardness test - Part 2: Verification and calibration of the t
5、esting devices (ISO 16859-2:2015) Matriaux mtalliques - Essai de duret Leeb - Partie 2 : Vrification et talonnage des appareils dessai (ISO 16859-2:2015) Metallische Werkstoffe - Hrteprfung nach Leeb - Teil 2: berprfung und Kalibrierung der Hrteprfgerte (ISO 16859-2:2015) This European Standard was
6、approved by CEN on 10 July 2015. CEN members 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 nation
7、al standards may be obtained on application 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 languag
8、e and notified to the CEN-CENELEC Management 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, H
9、ungary, Iceland, Ireland, Italy, Latvia, 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-C
10、ENELEC Management Centre: Avenue Marnix 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 16859-2:2015 EBS EN ISO 16859-2:2015EN ISO 16859-2:2015 (E) 3 European foreword This document (EN ISO 16859-2:2015
11、) has been prepared by Technical Committee 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 nationa
12、l standard, either by publication of an 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 righ
13、ts. CEN and/or CENELEC shall not be held 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, C
14、yprus, Czech Republic, Denmark, Estonia, 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 Uni
15、ted Kingdom. Endorsement notice The text of ISO 16859-2:2015 has been approved by CEN as EN ISO 16859-2:2015 without any modification. BS EN ISO 16859-2:2015ISO 16859-2:2015(E)Foreword iv1 Scope . 12 Normative references 13 General conditions . 14 Direct verification . 14.1 General . 14.2 Calibratio
16、n parameters 24.3 Verification of mass and geometry of impact body . 34.4 Verification of geometry and hardness of indenter ball 34.5 Verification of geometry of support ring 34.6 Verification of impact velocity . 34.7 Indirect verification of instrument 45 Indirect verification 45.1 General . 45.2
17、Procedure 45.3 Variation coefficient (V) 55.4 Error of test instrument 55.5 Measurement uncertainty . 66 Intervals between verifications 67 Verification report/calibration certificate 7Annex A (informative) Measurement uncertainty of calibration results of Leeb hardness testing instrument 8Annex B (
18、informative) Direct verification of single coil instrument 11Bibliography .12 ISO 2015 All rights reserved iiiContents PageBS EN ISO 16859-2:2015ISO 16859-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodi
19、es). 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, governmental and
20、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 maintenance are desc
21、ribed 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).Attention is drawn t
22、o 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 Introduction and/or on the
23、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 conformity assessment, a
24、s 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 testing.ISO 16859
25、 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 16859-2:2015INTERNATIONAL STANDARD ISO
26、 16859-2:2015(E)Metallic materials Leeb hardness test Part 2: Verification and calibration of the testing devices1 ScopeThis part of ISO 16859 specifies methods for direct and indirect verification of test instruments used for determining Leeb hardness in accordance with ISO 16859-1, and also descri
27、bes when these two types of verification are to be performed.The direct verification involves checking that individual instrument performance parameters fall within specified limits, whereas the indirect verification utilizes hardness measurements of reference test blocks, calibrated in accordance w
28、ith ISO 16859-3, to check the overall performance of the instrument for testing in the direction of gravity. The indirect method can be used on its own for the periodic performance checking in service.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in t
29、his document and are indispensable for 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 16859-3, Me
30、tallic materials Leeb hardness test Part 3: Calibration of reference test blocksISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method3 General conditionsBefore a Leeb hardness testing instrument is verified, the instrument shall be checked to ensure that it is properly set up and
31、operating in accordance with the manufacturers instructions.Especially it should be checked thata) the impact body is correctly installed in the guide tube,b) the support ring is mounted tightly to the bottom of the impact device,c) cables are correctly connected, if applicable, andd) the settings o
32、f the indicating unit are correct.4 Direct verification4.1 General4.1.1 Direct verification should be carried out at a temperature of (23 5) C. If the verification is made outside this temperature range, this shall be reported in the verification report.4.1.2 The instruments used for verification sh
33、all be traceable to national measurement standards. ISO 2015 All rights reserved 1BS EN ISO 16859-2:2015ISO 16859-2:2015(E)4.1.3 Direct verification is comprised of the following:a) verification of mass and geometry of impact body in accordance with 4.3;b) verification of geometry of indenter ball,
34、and of hardness of ball except for type E, in accordance with 4.4;c) verification of geometry of support ring in accordance with 4.5;d) verification of impact velocity in accordance with 4.6.4.2 Calibration parametersCalibration parameters for reference in direct calibrations of Leeb impact devices
35、are specified in Table 1.Table 1 Dimensions of Leeb impact devices for reference in direct calibrationsParameters of types of impact devicesD S E DL D+15 C GvAm/s Impact velocitya2,05 0,1 2,05 0,1 2,05 0,1 1,82 0,1 1,7 0,1 1,4 0,1 3,0 0,1mm Maximum distance of ball indenter from test piece surface a
36、t velocity measurement2,00 2,00 2,00 2,00 2,00 2,00 3,00M g Mass of impact body (incl. ball indenter)5,45 0,15.40 0,15,45 0,17, 25 0,17,75 0,13,1 0,0520,0 0,3R mm Spherical radius of indenter ball1,5 0,0051,5 0,0051,5 0,0051,39 0,0051,5 0,0051,5 0,0052,5 0,005Material of indentertungsten- carbide co
37、balt: balance; other carbides: 90 wt.-%; mass density 3,1 g/cm3 0,2 g/cm3polycrystal-line diamond Syndite; mass density 3,5 g/cm3 0,2 g/cm3tungsten- carbide cobalt: balance; other carbides: 700DL, S850C, E750G600aHLD for impact devices D, HLD+15 for impact devices D+15, HLDL for impact devices DL, H
38、LS for impact devices S, HLC for impact devices C, HLE for impact devices E, HLG for impact devices G.5.2 ProcedureThe reference test block shall be placed on a rigid support. Make 10 indentations on each reference test block uniformly distributed over the test surface in the direction of gravity. T
39、esting shall be done in accordance with ISO 16859-1.NOTE 1 For special applications, verification of the instrument can be limited to the hardness range corresponding to the hardness of the test pieces.NOTE 2 Only the calibrated surface of the test blocks are to be used for testing.NOTE 3 For testin
40、g in directions other than in direction of gravity, the measured hardness number will be different. For such cases, the applicable correction method can be provided by the manufacturer.4 ISO 2015 All rights reservedBS EN ISO 16859-2:2015ISO 16859-2:2015(E)5.3 Variation coefficient (V)VsHH=()100 in %
41、 (1)where s(H) is the standard deviation from n = 10 Leeb hardness readings:sHHn()()Hiin=211(2)The arithmetic mean value H from n = 10 measured Leeb hardness readings is calculated asHHH Hn=+12.n(n = 10) (3)whereH1, H2, ., Hnare measured Leeb hardness readings;n is number of Leeb hardness readings.T
42、he variation coefficient shall be considered as sufficient when meeting the requirements from Table 3.5.4 Error of test instrumentThe error of the test instrumentE = HHCRM (4)whereHCRMis Leeb hardness of utilized reference test block.The permissible error of the Leeb hardness test instrument is calc
43、ulated fromEHHHrelCRMCRM=100 in % (5)The permissible error of the Leeb hardness tester, expressed in percentage of the given Leeb hardness of the reference test block, shall not exceed the limits given in Table 3. ISO 2015 All rights reserved 5BS EN ISO 16859-2:2015ISO 16859-2:2015(E)Table 3 Permiss
44、ible variation coefficient and maximum permissible error of testing instrument on calibrated reference test blocksType of impact deviceLeeb hardness of reference test blockVariation coefficient of testing instrumentMaximum permissible error of testing instrumentHLaV Erel% % D, D+15 7001,5 2,0DL, S 8
45、50C, E 750G 600aHLD for impact 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.5.5 Measurement uncertaintyAnnex A contains an example estimation of measurement uncertainty fo
46、r Leeb hardness results with a Leeb hardness tester.6 Intervals between verificationsThe schedules for the direct verifications of hardness testing instruments are given in Table 4. In addition, it is recommended that the impact body and support ring are directly verified or replaced after two years
47、 of use.Indirect verification shall be done after a direct verification has been done, and it should be done once in 12 months, and shall not exceed 14 months.6 ISO 2015 All rights reservedBS EN ISO 16859-2:2015ISO 16859-2:2015(E)Table 4 Direct verification of Leeb hardness testing instrumentsRequir
48、ements Impact bodyImpact devicebSupport ring Indenter tipBefore first use Following repairs where impact energy, mechanical device, or testing cycle could be affected When indirect verification has not been passeda Last indirect verification 14 months back aThese parameters need to be tested consecu
49、tively until the instrument passes indirect verification. They do not need verification in such cases where use of a reference impact body can prove that the indirect verification has been failed due to the original impact body.bThis parameter is verified using a reference impact body and reference indicating unit.7 Verification report/calibration certificateAt minimum, the verification report/calibration certificate shall include the fol
