1、BSI Standards PublicationBS EN ISO 6508-2:2015Metallic materials Rockwellhardness testPart 2: Verification and calibration of testingmachines and indentersBS EN ISO 6508-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6508-2:2015. It supersedes BS EN
2、ISO 6508-2:2005 which iswithdrawn.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 purport to include all th
3、e necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 79169 7 ICS 77.040.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British St
4、andard was published under the authority of the Standards Policy and Strategy Committee on 31 March 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 6508-2 March 2015 ICS 77.040.10 Supersedes EN ISO 6508-2:2005Eng
5、lish Version Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines and indenters (ISO 6508-2:2015) Matriaux mtalliques - Essai de duret Rockwell - Partie 2: Vrification et talonnage des machines dessai et des pntrateurs (ISO 6508-2:2015) Metallische W
6、erkstoffe - Hrteprfung nach Rockwell - Teil 2: berprfung und Kalibrierung der Prfmaschinen und Eindringkrper (ISO 6508-2:2015) This European Standard was approved by CEN on 10 January 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for g
7、iving 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 application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three o
8、fficial 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies
9、 of 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, Portugal, Romania, Slovakia, Slovenia, Spai
10、n, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide
11、 for CEN national Members. Ref. No. EN ISO 6508-2:2015 EBS EN ISO 6508-2:2015EN ISO 6508-2:2015 (E) 3 Foreword This document (EN ISO 6508-2:2015) has been prepared by Technical Committee ISO/TC 164 “Mechanicaltesting of metals“ in collaboration with Technical Committee ECISS/TC 101 “Test methods for
12、 steel (otherthan 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 identicaltext or by endorsement, at the latest by September 2015, and conflicting national standards shall bewithdrawn
13、 at the latest by September 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6508-2:2005. Accordin
14、g to the CEN-CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, CzechRepublic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Gree
15、ce,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 text of ISO 6508-2:2015 has been approved by CEN as EN ISO 6508-2:2015 witho
16、ut any modification. BS EN ISO 6508-2:2015ISO 6508-2:2015(E)Foreword iv1 Scope . 12 Normative references 13 General conditions . 14 Direct verification of the testing machine 24.1 General . 24.2 Calibration and verification of the test force. 24.3 Calibration and verification of the depth-measuring
17、system . 24.4 Calibration and verification of the testing cycle . 34.5 Calibration and verification of the machine hysteresis 35 Indirect verification of the testing machine . 45.1 General . 45.2 Procedure 45.3 Repeatability . 55.4 Bias 65.5 Uncertainty of measurement 76 Calibration and verification
18、 of Rockwell hardness indenters . 76.1 General . 76.2 Diamond indenter 76.2.1 General 76.2.2 Direct calibration and verification of the diamond indenter . 76.2.3 Indirect verification of diamond indenters . 86.3 Ball indenter 96.3.1 Direct calibration and verification of the ball indenter 96.3.2 Ind
19、irect verification of the ball holder assembly 116.4 Marking 117 Intervals between direct and indirect calibrations and verifications .118 Verification report .12Annex A (normative) Repeatability of testing machines 13Annex B (informative) Uncertainty of measurement of the calibration results of the
20、 hardness testing machine 15Bibliography .24 ISO 2015 All rights reserved iiiContents PageBS EN ISO 6508-2:2015ISO 6508-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internat
21、ional 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-governmental, in liaison with I
22、SO, 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 ISO/IEC Directives, Pa
23、rt 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 possibility that some of the
24、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 patent declarations rec
25、eived (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, as well as information about ISOs ad
26、herence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing.This third edition cancels and replaces t
27、he first edition (ISO 6508-2:2005), which has been technically revised.ISO 6508 consists of the following parts, under the general title Metallic materials Rockwell hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines and Indenters Part 3: Calibration of refere
28、nce blocksiv ISO 2015 All rights reservedBS EN ISO 6508-2:2015Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters1 ScopeThis part of ISO 6508 specifies two separate methods of verification of testing machines (direct and indirect) for dete
29、rmining Rockwell hardness in accordance with ISO 6508-1:2015, together with a method for verifying Rockwell hardness indenters.The direct verification method is used to determine whether the main parameters associated with the machine function, such as applied force, depth measurement, and testing c
30、ycle timing, fall within specified tolerances. The indirect verification method uses a number of calibrated reference hardness blocks to determine how well the machine can measure a material of known hardness.The indirect method may be used on its own for periodic routine checking of the machine in
31、service.If a testing machine is also to be used for other methods of hardness testing, it shall be verified independently for each method.This part of ISO 6508 is applicable to stationary and portable hardness testing machines.Attention is drawn to the fact that the use of tungsten carbide composite
32、 for ball indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls may continue to be used only when complying with ISO 6508-1:2015, Annex A.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are
33、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 376, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial
34、 testing machinesISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodISO 6508-1:2015, Metallic materials Rockwell hardness test Part 1: Test methodISO 6508-3:2015, Metallic materials Rockwell hardness test Part 3: Calibration of reference blocks3 General conditionsBefore a Rockwe
35、ll hardness testing machine is verified, the machine shall be checked to ensure that it is properly set up and operating in accordance with the manufacturers instructions.Especially, it should be checked that the test force can be applied and removed without shock, vibration, or overload and in such
36、 a manner that the readings are not influenced.INTERNATIONAL STANDARD ISO 6508-2:2015(E) ISO 2015 All rights reserved 1BS EN ISO 6508-2:2015ISO 6508-2:2015(E)4 Direct verification of the testing machine4.1 General4.1.1 Direct verification involves calibration and verification of the following:a) tes
37、t forces;b) depth-measuring system;c) testing cycle;d) machine hysteresis test.4.1.2 Direct verification should be carried out at a temperature of (23 5) C. If the verification is made outside of this temperature range, this shall be reported in the verification report.4.1.3 The instruments used for
38、 calibration shall be traceable to national standards.4.1.4 An indirect verification according to Clause 5 shall be performed following a successful direct verification.4.2 Calibration and verification of the test force4.2.1 Each preliminary test force, F0, (see 4.2.4) and each total test force, F,
39、used (see 4.2.5) shall be measured, and, whenever applicable, this shall be done at not less than three positions of the plunger spaced throughout its range of movement during testing. The preliminary test force shall be held for at least 2 s.4.2.2 Three readings shall be taken for each force at eac
40、h position of the plunger. Immediately before each reading is taken, the plunger shall be moved in the same direction as during testing.4.2.3 The forces shall be measured by one of the following two methods: by means of a force-proving device according to ISO 376 class 1 or better and calibrated for
41、 reversibility; by balancing against a force, accurate to 0,2 %, applied by means of calibrated masses or by another method having the same accuracy.Evidence should be available to demonstrate that the output of the force-proving device does not vary by more than 0,2 % in the period 1 s to 30 s foll
42、owing a stepped change in force.4.2.4 The tolerance on each measurement of the preliminary test force, F0, (before application and after removal of the additional test force, F1) shall be 2,0 %, see Formula (B.2) The range of all force measurements (highest value minus lowest value) shall be 1,5 % o
43、f F0.4.2.5 The tolerance on each measurement of the total test force, F, shall be 1,0 %. The range of the force measurements (highest value minus lowest value) shall be 0,75 % of F.4.3 Calibration and verification of the depth-measuring system4.3.1 The depth-measuring system shall be calibrated by m
44、aking known incremental movements of the indenter or the indenter holder.2 ISO 2015 All rights reservedBS EN ISO 6508-2:2015ISO 6508-2:2015(E)4.3.2 The instrument or gauge blocks used to verify the depth-measuring system shall have a maximum expanded uncertainty of 0,000 3 mm when calculated with a
45、95 % confidence level.4.3.3 Calibrate the testing machines depth measurement system at not less than four evenly spaced increments covering the full range of the normal working depth measured by the testing machine. For this purpose, the working depth is 0,25 mm for regular Rockwell scales (A, C, D,
46、 B, E, F, G, H, K), and 0,1 mm for superficial Rockwell scales (N, T).4.3.4 Some testing machines have a long-stroke depth measuring system where the location of the working range of the depth measuring system varies to suit the sample. This type of testing machine shall be able to electronically ve
47、rify that the depth measuring device is continuous over the full range. These types of testers shall be verified using the following steps:a) At the approximate top, midpoint, and bottom of the total stroke of the measuring device, verify the depth measurement system at no less than four evenly spac
48、ed increments of approximately 0,05 mm at each of the three locations.b) Operate the actuator over its full range of travel to monitor whether the displacement measurement is continuous. The displacement indication shall be continuously indicated over the full range.4.3.5 The depth-measuring system
49、shall correctly indicate within 0,001 mm for the scales A to K and within 0,000 5 mm for scales N and T, i.e. within 0,5 of a scale unit, over each range.4.4 Calibration and verification of the testing cycle4.4.1 The testing cycle is to be calibrated by the testing machine manufacturer at the time of manufacture and when the testing machine undergoes repair which may have affected the testing cycle. Calibration of the complete testing cycle is not required as part of the direct verification at other times, see Tab
