EN ISO 4545-3-2018 en Metallic materials - Knoop hardness test - Part 3 Calibration of reference blocks.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Metallic materials Knoop hardness testPart 3: Calibration of reference blocksBS EN ISO 45453:2017National forewordThis British Standard is the UK implementation of EN ISO 45453:2018. It is identical to ISO 45453:2017. I

2、t supersedes BS EN ISO 45453:2005, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/101/5, Indentation hardness testing.A list of organizations represented on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 secretary.This publication does not purpo

3、rt 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 84282 5ICS 77.040.10Compliance with a British Standard cannot confer immunity from legal obligatio

4、ns.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 45453:2017EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 45453March 2018ICS 19.0

5、60; 77.040.10 Supersedes EN ISO 45453:2005EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2018 CEN Ref. No. EN ISO 45453:2018: EAll rights of exploitation in any form and by any means res

6、erved worldwide for CEN national MembersMetallic materials Knoop hardness test Part 3: Calibration of reference blocks (ISO 45453:2017)Matriaux mtalliques Essai de duret Knoop Partie 3: talonnage des blocs de rfrence (ISO 45453:2017)Metallische Werkstoffe Hrteprfung nach Knoop Teil 3: Kalibrierung v

7、on Hrtevergleichsplatten (ISO 45453:2017This European Standard was approved by CEN on 30 November 2017.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.

8、Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC 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 transla

9、tion under the responsibility of a CEN member into its own language 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,

10、Former 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 United Kingdom.English VersionEN ISO 45453:2018 (

11、E)European forewordThis document (EN ISO 45453:2018) 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 Europe

12、an Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest 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 el

13、ements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN ISO 45453:2005.According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries ar

14、e bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Po

15、rtugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 4545-3:2017 has been approved by CEN as EN ISO 4545-3:2018 without any modification.2BS EN ISO 45453:2017ISO 45453:2017Foreword iv1 Scope . 12 Normative references

16、 13 Terms and definitions . 14 Manufacture of the reference block . 14.1 General . 14.2 Thickness . 14.3 Test surface area 14.4 Magnetism . 24.5 Flatness and parallelism . 24.6 Surface roughness 24.7 Prevention of the regrind of the test surface 25 Calibration machine 25.1 General . 25.2 Direct veri

17、fication . 25.3 Traceability of verification instruments . 25.4 Test force 35.5 Indenter . 35.6 Diagonal measurement system . 36 Calibration procedure . 37 Number of indentations 48 Uniformity of hardness 48.1 Relative nonuniformity 48.2 Uncertainty of measurement 49 Marking 410 Calibration certific

18、ate . 511 Validity 5Annex A (informative) Adjustment of Khler illumination systems . 6Annex B (informative) Uncertainty of mean hardness value of hardnessreference blocks 7Bibliography .12 ISO 2017 All rights reserved iiiContents PageBS EN ISO 45453:2017ISO 45453:2017ForewordISO (the International O

19、rganization 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 estab

20、lished has the right to be represented on that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardizati

21、on.The procedures used to develop this document and those intended for its further maintenance 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

22、the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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 such patent rights. Details of any pat

23、ent rights identified during the development of the document will be in the Introduction 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

24、an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity 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.is

25、o.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing.This second edition cancels and replaces the third edition (ISO 45453:2005), which has been technically revised.Significant technical changes from t

26、he previous edition of this document include: the requirements for the maximum test surface area of the reference block have been added; the requirements for the maximum uncertainty of the line intervals on the stage micrometer have been revised; the requirements for the calibration and verification

27、 of the measuring system have been revised, as per ISO 45452; the requirements for the uniformity of the reference block hardness have been revised to account for different numbers of calibration indentations; the timing requirements for the approach velocity and the time duration at maximum test fo

28、rce have been revised to indicate a target time value; Annex B has been revisedA list of all parts in the ISO 4545 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 45453:2017Metallic materials Knoop hardness test Part 3: Calibration of reference blocks1 ScopeThis docum

29、ent specifies the method for the calibration of reference blocks to be used for the indirect verification of Knoop hardness testing machines as specified in ISO 4545-2.The method is applicable only for indentations with long diagonals 0,020 mm.2 Normative referencesThe following documents are referr

30、ed to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 376:2011, Metallic materials

31、 Calibration of force-proving instruments used for the verification of uniaxial testing machinesISO 45451, Metallic materials Knoop hardness test Part 1: Test methodISO 45452, Metallic materials Knoop hardness test Part 2: Verification and calibration of testing machines3 Terms and definitionsNo ter

32、ms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 Manufacture of the referenc

33、e block4.1 GeneralThe block shall be specially manufactured for use as a hardnessreference block using a manufacturing process that will give the necessary homogeneity, stability of structure and uniformity of surface hardness.4.2 ThicknessEach metal block to be calibrated shall be of a thickness no

34、t less than 5 mm.4.3 Test surface areaThe test surface area of the reference block shall not exceed 40 cm2.INTERNATIONAL STANDARD ISO 45453:2017 ISO 2017 All rights reserved 1BS EN ISO 45453:2017ISO 45453:20174.4 MagnetismThe reference blocks shall be free of magnetism. It is recommended that the ma

35、nufacturer ensure that the blocks, if made of steel, have been demagnetized at the end of the manufacturing process (before calibration).4.5 Flatness and parallelismThe maximum deviation in flatness of the test and support surfaces shall not exceed 0,005 mm. The maximum error in parallelism shall no

36、t exceed 0,010 mm in 50 mm.4.6 Surface roughnessThe test surface shall be free from scratches that interfere with the measurement of the indentations. The test surface roughness, Ra, shall not exceed 0,05 m1. The bottom support surface shall be a finely ground finish or better.4.7 Prevention of the

37、regrind of the test surfaceTo verify that no material is subsequently removed from the reference block, the thickness at the time of calibration shall be marked on the reference block to the nearest 0,01 mm, or an identifying mark shall be made on the test surface see 8.2 e).5 Calibration machine5.1

38、 GeneralIn addition to fulfilling the general requirements specified in ISO 4545-2, the calibration machine shall also meet the requirements given in 5.2 to 5.6.NOTE The criteria specified in this document for the performance of the calibration machine have been developed and refined over a signific

39、ant 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 be inappropriate to make any further allowance for t

40、his uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all measurements made when performing a direct verification of the calibration machine.5.2 Direct verificationThe calibration machine shall be directly verified in intervals not exceeding 12 month

41、s.Direct verification involves calibration of the test force, verification of the indenter, calibration and verification of the diagonal measuring system, and verification of the testing cycle, and if not possible, at least the force versus time behaviour.5.3 Traceability of verification instruments

42、The instruments used for verification and calibration shall be traceable to national standards.2 ISO 2017 All rights reservedBS EN ISO 45453:2017ISO 45453:20175.4 Test forceEach test force shall be verified at three different positions of the plunger, spaced at approximately equal increments coverin

43、g the limits of travel used during testing. At each position, the force shall be measured three times using an elastic proving device, according to ISO 376:2011, Class 0,5 or better, or by another method having the same or better accuracy. Each measurement shall agree with the nominal value to withi

44、n 0,5 %.5.5 IndenterThe indenter shall comply with ISO 45452 and meet the following requirements:a) the four faces of the rhombicbased diamond pyramid shall be highly polished, free from surface defects, and flat within 0,000 3 mm;b) the angle (see ISO 45451), between opposite edges at the vertex of

45、 the diamond pyramid, shall be (130 0,1);c) the angle between the axis of the diamond pyramid and the axis of the indenter holder (normal to the seating surface) shall not exceed 0,3;d) the point of the diamond indenter shall be examined with a highpower measuring microscope or preferably with an in

46、terference microscope. If the four faces do not meet at a point, the line of junction, as described in ISO 45452, between opposite faces shall be less than 0,000 3 mm.A valid calibration certificate shall exist which confirms the geometrical deviations of the indenter.5.6 Diagonal measurement system

47、The scale of the diagonal measuring system shall be graduated to permit estimation of the diagonals of the indentation to the greater of 0,000 15 mm or 0,25 % of the length measured.The system for measuring the long diagonal of the indentation shall be verified at each magnification and for each inc

48、orporated line scale to be used in two perpendicular measurement axes (if applicable), by performing measurements on an accurately ruled stage micrometer. Measurements shall be made at a minimum of five evenly spaced intervals, arranged centrally in the field of view, covering each working range.The

49、 maximum expanded uncertainty of the distance between the line intervals on the stage micrometer shall be 0,000 2 mm or 0,04 %, whichever is greater.Three measurements shall be made at each of the evenly spaced intervals. The maximum permissible error of each of the three diagonal measurements at each interval shall be the greater of 0,000 3 mm or 0,5 % of the length measured.NOTE A helpful technique for adjusting optical systems that have Khler illumination is g