ISO-4545-2-2005.pdf
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1、 Reference number ISO 4545-2:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 4545-2 First edition 2005-11-15 Metallic materials Knoop hardness test Part 2: Verification and calibration of testing machines Matriaux mtalliques Essai de duret Knoop Partie 2: Vrification et talonnage des machines dessai ISO
2、 4545-2:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloa
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5、en below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member
6、 body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reserved ISO 4545-2:2005(E) ISO 2005 All rights reserved iii Contents Pag
7、e Foreword iv 1 Scope . 1 2 Normative references. 1 3 General conditions . 1 4 Direct verification 2 5 Indirect verification. 4 6 Intervals between verifications . 6 7 Verification report/calibration certificate . 6 Annex A (informative) Notes on diamond indenters 7 Annex B (informative) Uncertainty
8、 of measurement of the calibration results of the hardness testing machine. 8 Bibliography. 14 ISO 4545-2:2005(E) iv ISO 2005 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
9、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 non-governmental,
10、 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main t
11、ask of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attent
12、ion 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. ISO 4545-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3,
13、 Hardness testing. ISO 4545-2 cancels and replaces ISO 4546:1993, which has been technically revised. ISO 4545 consists of the following parts, under the general title Metallic materials Knoop hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibra
14、tion of reference blocks Part 4: Table of hardness values INTERNATIONAL STANDARD ISO 4545-2:2005(E) ISO 2005 All rights reserved 1 Metallic materials Knoop hardness test Part 2: Verification and calibration of testing machines 1 Scope This part of ISO 4545 specifies the method of verification of tes
15、ting machines for determining Knoop hardness for metallic materials in accordance with ISO 4545-1-1. It covers test forces from 0,098 07 N to 19,614 N. The method is recommended only for indentations with diagonals W 0,020 mm. It specifies a direct verification method for checking the main functions
16、 of the machine, and an indirect verification method suitable for the overall checking of the machine. The indirect verification 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 sh
17、ould be verified independently for each method. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any
18、 amendments) applies. ISO 376:2004, Metallic materials Calibration of force-proving instuments used for the verification of uniaxial testing machines ISO 4545-1:2005, Metallic materials Knoop hardness test Part 1: Test method ISO 4545-3, Metallic materials Knoop hardness test Part 3: Calibration of
19、reference blocks 3 General conditions Before a Knoop hardness testing machine is verified, it shall be checked to ensure that it is properly set up in accordance with the manufacturers instructions. Especially, it should be checked that: a) the mount holding the indenter is capable of moving freely
20、without any friction or excess side play; b) the indenter is firmly mounted in the mount; c) the test force can be applied and removed without shock or vibration and in such a manner that the readings are not influenced; ISO 4545-2:2005(E) 2 ISO 2005 All rights reserved d) the measuring system is in
21、tegral with the machine: the change in mode from the application and removal of the test force to the measuring mode does not influence the readings, illumination does not affect the readings, the centre of the indentation is near the centre of the field of view. 4 Direct verification 4.1 General 4.
22、1.1 Direct verification should be carried out at a temperature of (23 5) C. If the verification is carried out at a temperature outside this range, it shall be noted in the verification report. 4.1.2 The instruments used for verification and calibration shall be traceable to national standards. 4.1.
23、3 Direct verification involves: a) calibration of the test force; b) verification of the indenter; c) calibration of the measuring system; d) verification of the testing cycle. 4.2 Calibration of the test force 4.2.1 Each test force used (see Table 2 in ISO 4545-1:2005), within the working range of
24、the testing machine, shall be measured. 4.2.2 The test force shall be measured by one of the following two methods: by means of an elastic proving device in accordance with ISO 376:2004, class 1, or by balancing against a force, accurate to 0,2 %, applied by means of calibrated masses or another met
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