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Metallic materials Brinell hardness test. Part 3: Calibration of reference blocks - PDF
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1 INTERNATIONAL STANDARD ISO Third edition Metallic materials Brinell hardness test Part 3: Calibration of reference blocks Matériaux métalliques Essai de dureté Brinell Partie 3: Étalonnage des blocs de référence Reference number ISO :2014(E) ISO 2014
3 Contents Page Foreword...iv 1 Scope Normative references Manufacture of reference blocks Calibration machine Calibration procedure Number of indentations Non-uniformity of reference block Marking Validity... 5 Annex A (informative) Uncertainty of the mean hardness value of reference blocks...6 Bibliography...10 ISO 2014 All rights reserved iii
4 Foreword ISO (the International Organization 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 coittees. Each member body interested in a subject for which a technical coittee has been established has the right to be represented on that coittee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Coission (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, 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 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 patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see 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 ISO s adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The coittee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcoittee SC 3, Hardness testing. This third edition cancels and replaces the second edition (ISO :2005), which has been technically revised. ISO 6506 consists of the following parts, under the general title Metallic materials Brinell hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibration of reference blocks Part 4: Tables of hardness values iv ISO 2014 All rights reserved
5 INTERNATIONAL STANDARD ISO :2014(E) Metallic materials Brinell hardness test Part 3: Calibration of reference blocks 1 Scope This part of ISO 6506 specifies a method for the calibration of reference blocks to be used in the indirect verification of Brinell hardness testing machines as described in ISO The procedures necessary to ensure metrological traceability of the calibration machine are also specified. 2 Normative references The 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 document (including any amendments) applies. ISO 376, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial testing machines ISO :2014, Metallic materials Brinell hardness test Part 1: Test method ISO :2014, Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines 3 Manufacture of reference blocks 3.1 The block shall be specially manufactured for use as a reference block. NOTE Attention is drawn to the need to use a manufacturing process which will give the necessary homogeneity, stability of structure, and uniformity of surface hardness. 3.2 Each metal block to be calibrated shall be of a thickness not less than 16 for 10 balls, 12 for 5 balls, or 6 for smaller balls. NOTE 12 for 10 balls can be used only if the hardness of the reference block is greater than 150 HBW. 3.3 The reference blocks shall be free of magnetism. It is recoended that the manufacturer shall ensure that the blocks, if of steel, have been demagnetized at the end of the manufacturing process. 3.4 The flatness of the two surfaces and the parallelism of the reference block shall be in accordance with Table 1. ISO 2014 All rights reserved 1
6 Diameter of ball Table 1 Requirements for the reference blocks Tolerance in flatness of the surfaces Tolerance in parallelism over 50 Permissible surface roughness Ra a µm Test surface Bottom surface 10 0,040 0,050 0,3 0,8 5 0,030 0,040 0,2 0,8 2,5 0,020 0,030 0,1 0,8 1,0 0,020 0,030 0,05 0,8 a Sampling length: l = 0,80 (see ISO 4287). 3.5 The test surface shall be free from scratches which interfere with the measurement of the indentations (see Table 1). 3.6 To verify that no material is subsequently removed from the reference block, the thickness at the time of calibration shall be marked on it to the nearest 0,1, or an identifying mark shall be made on the test surface [see 8.1, item e)]. 4 Calibration machine 4.1 In addition to fulfilling the general requirements specified in ISO :2014, Clause 3, the calibration machine shall also meet the requirements given in 4.2 to The machine shall be verified directly in intervals not exceeding 12 months. Direct verification involves a) measurement of the test forces, b) measurement of the diameter, hardness, and density of the indenter ball, c) calibration of the indentation diameter measuring device, and d) measurement of the testing cycle, if this is not possible, at least the force versus time behaviour. 4.3 The instruments used for verification and calibration shall be traceable to the SI. 4.4 Each test force shall be measured a minimum of three times using an elastic proving device of ISO 376 class 0,5 or better. For machines that apply the force by hydraulic or weight systems, these force measurements shall be made at each of three different indenter positions uniformly spaced throughout its range of movement during machine operation. The mean measurement (at each indenter position, where applicable) shall agree with the nominal value to within ±0,1 %. 4.5 The indenters shall be measured as specified in ISO :2014, 4.3, and shall meet the size, hardness, and density requirements given there. 4.6 The scale of the indentation diameter measuring system shall be graduated to read to 0,002 for indentations made with 10 and 5 balls, and 0,001 for indentations made with balls of less than 5 diameter. The indentation diameter measuring system shall be calibrated against a standard scale at a minimum of five intervals over each working range. The performance of the indentation diameter measuring system (defined as the sum of the measured deviation from the standard scale and the expanded uncertainty of the standard scale) in relation to the diameters of indentation shall be as given in Table 2. 2 ISO 2014 All rights reserved
7 Table 2 Performance of the indentation diameter measuring device Diameter of indentation Performance d < 1 ±0, d < 2,5 ±0,001 0 d 2,5 ±0, The testing cycle shall conform to the testing cycle described in ISO and shall be timed with an uncertainty less than ±0,5 s. 5 Calibration procedure The reference blocks shall be calibrated in a calibration machine as described in Clause 4, at a temperature of (23 ± 5) C, using the general procedure described in ISO During calibration, the thermal drift should not exceed 1 C. The maximum velocity of the indenter iediately before it touches the surface of the test block shall be as specified in Table 3. Table 3 Maximum indenter approach velocity Ball diameter Maximum velocity s 1 1 0,3 2,5 0,6 5 or 10 1,0 The time from the initial application of force to the time the full test force is reached shall be (7 ± 1) s. The duration of the test force shall be (14 ± 1) s. 6 Number of indentations On each reference block, at least five indentations shall be made, uniformly distributed over the entire test surface. At least one of the indentations shall be identified as a reference indentation [see 8.3, item e)]. NOTE Performing more than five indentations might reduce the measurement uncertainty. ISO 2014 All rights reserved 3
8 7 Non-uniformity of reference block 7.1 Let d 1, d 2, d 3, d 4, and d 5 be the values of the mean measured diameters of the indentations arranged in increasing order of magnitude. The non-uniformity of the block under the particular conditions of calibration is characterized by R = d 5 d 1 (1) and is expressed as a percentage of d ( ) d d Rrel = d 1 (2) where d + d + d + d + d d = (3) 7.2 The maximum permissible value of non-uniformity of a reference block shall be as specified in Table 4. Table 4 Maximum permissible value of non-uniformity d Maximum permissible value of non-uniformity, R rel % d < 0,5 2,0 0,5 d 1 1,5 d > 1 1,0 NOTE For hardness values less than 225 HBW, the maximum permissible value of non-uniformity can be 2,0 %. 7.3 Methods for determining the uncertainty of measurement of hardness reference blocks are given in Annex A and Reference [6]. 8 Marking 8.1 Each reference block shall be marked with the following: a) arithmetic mean of the hardness values found in the block calibration, for example: 348 HBW 5/750; b) name or mark of the supplier or manufacturer; c) serial number; d) name or mark of the calibration agency; e) thickness of the block or an identifying mark on the test surface (see 3.6); f) year of calibration, if not indicated in the serial number. 8.2 Any mark put on the side of the block shall be upright when the test surface is the upper face. 4 ISO 2014 All rights reserved
9 8.3 Each delivered reference block shall be accompanied by a document giving at least the following information: a) a reference to this part of ISO 6506 (i.e. ISO ); b) the identity of the block; c) the date of calibration; d) the arithmetic mean of the hardness values and its associated uncertainty and the value characterizing the non-uniformity of the block (see 7.1); e) information about the location of the reference indentation(s) and the orientations and values of the measured diameters, together with the mean measured diameter(s). 9 Validity The hardness-reference block is only valid for the scale for which it was calibrated. The calibration validity should be limited to a duration of five years. Attention is drawn to the fact that, for Al- and Cu-alloys, the calibration validity should be reduced to two to three years. ISO 2014 All rights reserved 5
10 Annex A (informative) Uncertainty of the mean hardness value of reference blocks A.1 General Measurement uncertainty analysis is a useful tool to help determine sources of error and to understand differences between measured values. This annex gives guidance on uncertainty estimation but the values derived are for information only, unless specifically instructed otherwise by the customer. The criteria specified in this part of ISO 6506 for the calibration requirements of the reference block have been developed and refined over a significant period of time. When determining a specific tolerance that the reference block needs to meet, the uncertainty associated with the use of measuring equipment has been incorporated within this tolerance and it would therefore be inappropriate to make any further allowance for this uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all measurements associated with the manufacture and calibration of the reference blocks and also to all measurements made when performing a verification of the calibration machine. In each case, it is simply the measured value resulting from the use of the specified measuring equipment that is used to assess compliance with this part of ISO The metrological chain necessary to define and disseminate hardness scales is shown in ISO :2014, Figure C.1. A.2 Direct verification of the calibration machine A.2.1 Measurement of the test force See ISO :2014, Annex A. A.2.2 Calibration of the indentation diameter measuring system See ISO :2014, Annex A. A.2.3 Measurement of the indenter See ISO :2014, Annex A. A.2.4 Measurement of the test cycle See ISO :2014, Annex A. A.3 Indirect verification of the calibration machine NOTE In this annex, the index CRM (Certified Reference Material) means, according to the definitions of the hardness testing standards, Hardness Reference Block. By the indirect verification with primary reference blocks, the overall function of the calibration machine is checked and the repeatability as well as the deviation of the calibration machine from the actual hardness value are determined. 6 ISO 2014 All rights reserved
11 The uncertainty of measurement of the indirect calibration of the calibration machine follows from the formula: CM CRM P xcrm 1 CRM D ms u = u + u + u + u (A.1) where u CRM-P u xcrm-1 u CRM-D u ms is the calibration uncertainty of the primary reference block according to the calibration certificate for k = 1; is the repeatability of the calibration machine; is the hardness change of the primary reference block since its last calibration due to drift; is the standard uncertainty due to the resolution of the indentation diameter measuring system. EXAMPLE Primary reference block: (591,7 ± 3,6) HBW 2,5/187,5 Uncertainty of measurement of the primary reference block: u CRM-1 = ± 1,8 HBW 2,5/187,5 Time drift of the primary reference block: u CRM-D = 0 Resolution of the indentation diameter measuring system: δ ms = 0,1 µm Table A.1 Results of the indirect verification Number Measured indentation diameter d Calculated hardness value H HBW 1 0,630 5 max 591,4 min 2 0, ,3 3 0,629 5 min 593,3 max 4 0, ,9 5 0, ,3 Mean value H 0, ,6 Standard deviation s xcrm 1 0, ,81 HBW: Brinell hardness u x CRM 1 t s = x CRM 1 = 041, (A.2) n (t = 1,14 for n = 5) ISO 2014 All rights reserved 7
12 Quantity Table A.2 Budget of uncertainty of measurement Estimated value Standard uncertainty of measurement Distribution type Sensitivity coefficient Uncertainty contribution X i x i u(x i ) c i u i (H) u CRM-P 591,7 HBW 1,8 HBW Normal 1,0 1,80 u xcrm-1 592,6 HBW 0,41 HBW Normal 1,0 0,41 U ms 630,0 µm 0,1 µm Rectangular HBW 1 909,2 HBW/ (see Note) 0,06 u CRM-D 0,0 HBW 0,0 HBW Triangular 1,0 0,0 Combined uncertainty of measurement, u CM 1,85 NOTE The sensitivity coefficient follows from: 2 2 H = H D+ D d d d 2 2 D d for H = 591,7 HBW, D = 2,5, d = 0, (A.3) A.4 Uncertainty of measurement of reference blocks The uncertainty of measurement of reference blocks follows from Formula (A.4): 2 u CRM = u CM + u x CRM 2 2 (A.4) where u CRM u xcrm-2 u CM is the calibration uncertainty of reference blocks; is the standard uncertainty due to the inhomogeneity of the hardness distribution of the reference block; see Formula (A.1). Table A.3 Determination of the inhomogeneity of the reference block Number Measured indentation diameter d Calculated hardness value H HBW 1 0,630 4 max 591,01 min 2 0, ,60 3 0,629 4 min 592,92 max 4 0, ,53 5 0, ,34 Mean value H 0, ,08 Standard deviation s xcrm-2 0, ,77 8 ISO 2014 All rights reserved
13 Standard uncertainty of CRM: u x CRM 2 t s = x CRM with t = 1,14 and n = 5: u xcrm-2 = 0,39 HBW n 2 (A.5) Table A.4 Uncertainty of measurement of the reference block Hardness of reference block Inhomogeneity of the reference block Uncertainty of measurement of the calibration machine Expanded calibration uncertainty of reference block H CRM u xcrm-2 u CM U CRM HBW HBW HBW HBW 592,64 0, 39 1,85 3,8 with 2 2 CRM CM CRM 2 U = 2 u + u x (A.6) ISO 2014 All rights reserved 9
14 Bibliography [1] ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters [2] Sawla A. Uncertainty of measurement in the verification and calibration of the force measuring systems of testing machines, Proceedings of the Asia-Pacific symposium on measurement of force, mass and torque (APMF), Tsukuba, Japan, November 2000 [3] Wehrstedt A., & Patkovszky I. News in the field of standardization about verification and calibration of materials testing machines, EMPA Academy, May 2001 [4] Gabauer W. Manual codes of practice for the determination of uncertainties in mechanical tests on metallic materials, The estimation of uncertainties in hardness measurements, Project No. SMT4- CT , UNCERT COP 14, 2000 [5] Polzin T., & Schwenk D. Method for Uncertainty Determination of Hardness Testing; PC File for Determination, Materialprüfung 44 ( 2002) 3, pp [6] Guidelines on the Estimation of Uncertainty in Hardness Measurements, EURAMET cg-16, Version 2.0, March ISO 2014 All rights reserved
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