DIN EN ISO 6508-2-2015 Metallic materials - Rockwell hardness test - Part 2 Verification and calibration of testing machines and indenters (ISO 6508-2 2015) German version EN ISO 6.pdf

1、June 2015Translation by DIN-Sprachendienst.English price group 15No 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).ICS 77

2、.040.10!%CZi“2325570www.din.deDDIN EN ISO 6508-2Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters(ISO 6508-2:2015);English version EN ISO 6508-2:2015,English translation of DIN EN ISO 6508-2:2015-06Metallische Werkstoffe Hrteprfung nach

3、Rockwell Teil 2: berprfung und Kalibrierung der Prfmaschinen und Eindringkrper(ISO 6508-2:2015);Englische Fassung EN ISO 6508-2:2015,Englische bersetzung von DIN EN ISO 6508-2:2015-06Matriaux mtalliques Essai de duret Rockwell Partie 2: Vrification et talonnage des machines dessai et des pntrateurs(

4、ISO 6508-2:2015);Version anglaise EN ISO 6508-2:2015,Traduction anglaise de DIN EN ISO 6508-2:2015-06SupersedesDIN EN ISO 6508-2:2006-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 33 pages06.15 DIN EN ISO 6508-2:2015-06 2 A comma is

5、 used as the decimal marker. National foreword This document (EN ISO 6508-2:2015) 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

6、for steel (other than chemical analysis)” (Secretariat: AFNOR, France) in accordance 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 Materia

7、ls Testing), Working Committee NA 062-01-41 AA Hrteprfung fr Metalle. DIN EN ISO 6508 consists of the following parts, under the general title Metallic materials Rockwell hard-ness test: Part 1: Test methods Part 2: Verification and calibration of testing machines and indenters Part 3: Calibration o

8、f reference blocks The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 376 DIN EN ISO 376 ISO 6507-1 DIN EN ISO 6507-1 ISO 6508-1 DIN EN ISO 6508-1 ISO 6508-3 DIN EN ISO 6508-3 ISO/IEC 17011 DIN EN ISO/IEC 17011 ISO/IEC 17025 DIN EN ISO/IEC

9、 17025 Amendments This standard differs from DIN EN ISO 6508-2:2006-03 as follows: a) several values are given as a mean with a (in some cases asymmetrical) tolerance rather than a range; b) maximum permissible ranges for individual measurements of test force and preliminary test force have been def

10、ined in addition to the already specified tolerances; c) Subclause 4.5 “Calibration and verification of the machine hysteresis” has been added; d) Clause 6 “Calibration and verification of Rockwell hardness indenters” has been added; e) Annex B “Uncertainty of measurement of the calibration results

11、of the hardness testing machine” has been thoroughly revised; f) the standard has been editorially revised. Previous editions DIN 51224: 1957-09, 1976-10, 1985-01 DIN 51304: 1983-09 DIN EN 10109-2: 1995-01 DIN EN 10109-2 Supplement 1: 1995-01 DIN EN ISO 6508-2 Supplement 1: 1999-10 DIN EN ISO 6508-2

12、:1999-10, 2006-03 DIN EN ISO 6508-2:2015-06 3 National Annex NA (informative) Recommendations for the verification and design of testing machines and indenters NA.1 Design of testing machine and indenter Figure NA.1 shows dimensions for the throat depth and vertical capacity of the testing machine,

13、and Figure NA.2 shows a recommended indenter design, both of which were included in DIN 51225-1:1995-01 but which are no longer included here. Working Committee NA 062-01-41 AA Hrteprfung fr Metalle recommends these dimensions and design features to ensure fitting of the force-proving instrument nee

14、ded for direct verification of the test force. NA.2 Verification of indenter The overall conformity of the indenter should be verified by an accredited calibration laboratory and the relevant test mark applied to the holder. At the installation site of the testing machine, a check should be made as

15、to whether there is proof of conformity of the indenter geometry. In addition, a visual check using a magnifying glass having at least a 10x magnification is to be made to see if the indenter surface has any defects or deposits. Since, with use, there are changes to the indenter which cannot be iden

16、tified by means of a magnifying glass, but which have a considerable effect on measurement results, the indenter should be changed at least every two years. NA.3 Intervals between verifications Since 1959 the national standard DIN 51220 has specified that definitive tests may only be carried out usi

17、ng a testing machine that has been verified and calibrated according to the relevant standards. Verification was to be performed before the machine was commissioned, after each re-installation, conversion or retrofitting, and at least once a year; both indirect and direct verification were to be car

18、ried out. Experience had shown that this is necessary because indirect verification is carried out on reference blocks to determine the machine error, while with direct verification, it can be established whether or not the various errors cancel each other out, and particularly whether there is fric

19、tion in the force application system of the machine. According to Clause 7 of this European Standard, direct verification does not need to be carried out each year if the requirements of Table 10 are met. However, on the basis of the long-term experience of testing houses in Germany, NA 062-01-41 AA

20、 Hrteprfung fr Metalle recommends that direct verification continues to be carried out yearly, to ensure the correctness of test results, thus maintaining the accustomed comparability of results obtained with different machines using the same method and under the same conditions. DIN EN ISO 6508-2:2

21、015-06 4 Key a Throat depth, 120 mm b Vertical capacity, 200 mm Figure NA.1 Throat depth and vertical capacity Key 1 Shaft 4 Shank 2 Shoulder face 5 Indenter 3 Shoulder 6 Holder Figure NA.2 Recommended design of indenter and holder DIN EN ISO 6508-2:2015-06 5 National Annex NA (informative) Bibliogr

22、aphy DIN 51220, Materials testing machines Generals for requirements and for verification and calibration of materials testing machines DIN EN ISO 376, Metallic materials Calibration of extensometer systems used in uniaxial testing DIN EN ISO 3738-1, Hard metals Rockwell hardness test (scale A) Part

23、 1: Test methods DIN EN ISO 4498, Sintered metal materials, excluding hardmetals Determination of apparent hardness and microhardness DIN EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methods DIN EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test methods DIN

24、 EN ISO 6508-3, Metallic materials Rockwell hardness test Part 3: Calibration of reference blocks DIN EN ISO/IEC 17011, Conformity assessment General requirements for accreditation bodies accrediting conformity assessment bodies DIN EN ISO/IEC 17025, General requirements for the competence of testin

25、g and calibration laboratories DIN EN ISO 6508-2:2015-06 6 This page is intentionally blank EN ISO 6508-2 March 2015 ICS 77.040.10 Supersedes EN ISO 6508-2:2005English VersionMetallic materials - Rockwell hardness test - Part 2:Verification and calibration of testing machines and indenters(ISO 6508-

26、2:2015)Matriaux mtalliques - Essai de duret Rockwell - Partie 2: Vrification et talonnage des machines dessai et des pntrateurs (ISO 6508-2:2015) Metallische Werkstoffe - Hrteprfung nach Rockwell -Teil 2: berprfung un d K alibrierung de r P rfmaschinen un dEindringkrper (ISO 6508-2:2015)This Europea

27、n 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 giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references conc

28、erning 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 official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member in

29、to 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, Former Yugoslav Republic of Macedonia, France,

30、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of e

31、xploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6508-2:2015 EEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGContents Page Foreword . 3 1 Scope . 4 2

32、 Normative references. 4 3 General conditions . 4 4 Direct verification of the testing machine . 5 4.1 General 5 4.2 Calibration and verification of the test force . 5 4.3 Calibration and verification of the depth-measuring system 5 4.4 Calibration and verification of the testing cycle . 6 4.5 Calib

33、ration and verification of the machine hysteresis . 6 5 Indirect verification of the testing machine . 7 5.1 General 7 5.2 Procedure 7 5.3 Repeatability . 8 5.4 Bias 9 5.5 Uncertainty of measurement . 10 6 Calibration and verification of Rockwell hardness indenters . 10 6.1 General 10 6.2 Diamond in

34、denter . 10 6.2.1 General 10 6.2.2 Direct calibration and verification of the diamond indenter 10 6.2.3 Indirect verification of diamond indenters 11 6.3 Ball indenter 12 6.3.1 Direct calibration and verification of the ball indenter . 12 6.3.2 Indirect verification of the ball holder assembly 14 6.

35、4 Marking 14 7 Intervals between direct and indirect calibrations and verifications 14 8 Verification report 15 Annex A (normative) Repeatability of testing machines . 16 Annex B (informative) Uncertainty of measurement of the calibration results of the hardness testing machine 18 Bibliography 27 DI

36、N EN ISO 6508-2:2015-06 EN ISO 6508-2:2015 (E) 2Foreword This document (EN ISO 6508-2:2015) 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

37、of which is held by AFNOR. This European 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 2015, and conflicting national standards shall be withdrawn at the latest by September 2015. Attention is drawn

38、 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 held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6508-2:2005. According to the CEN-CENELEC Internal Regulations, the nati

39、onal standards organizations of the following countries are 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, Lit

40、huania, 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 without any modification. “”DIN EN ISO 6508-2:2015-0

41、6EN ISO 6508-2:2015 (E)31 ScopeThis part of ISO 6508 specifies two separate methods of verification of testing machines (direct and indirect) for determining Rockwell hardness in accordance with ISO 6508-1:2015, together with a method for verifying Rockwell hardness indenters.The direct verification

42、 method is used to determine whether the main parameters associated with the machine function, such as applied force, depth measurement, and testing cycle timing, fall within specified tolerances. The indirect verification method uses a number of calibrated reference hardness blocks to determine how

43、 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 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

44、 ISO 6508 is applicable to stationary and portable hardness testing machines.Attention is drawn to the fact that the use of tungsten carbide composite 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

45、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 indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced

46、document (including any amendments) applies.ISO 376, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial testing machinesISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodISO 6508-1:2015, Metallic materials Rockwell hardness test Pa

47、rt 1: Test methodISO 6508-3:2015, Metallic materials Rockwell hardness test Part 3: Calibration of reference blocks3 General conditionsBefore a Rockwell hardness testing machine is verified, the machine shall be checked to ensure that it is properly set up and operating in accordance with the manufa

48、cturers instructions.Especially, it should be checked that the test force can be applied and removed without shock, vibration, or overload and in such a manner that the readings are not influenced.DIN EN ISO 6508-2:2015-06 EN ISO 6508-2:2015 (E) 44 Direct verification of the testing machine4.1 Gener

49、al4.1.1 Direct verification involves calibration and verification of the following:a) test 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 calibrati