ISO 7267-3-2011 Rubber-covered rollers - Determination of apparent hardness - Part 3 Pusey and Jones method《胶辊表面硬度的测定 第3部分 普西-琼斯法》.pdf

1、Rubber-covered rollers Determination of apparent hardness Part 3:Pusey and Jones methodCylindres revtus de caoutchouc Dtermination de la duret apparente Partie 3: Mthode Pusey et Jones ISO 2011Reference numberISO 7267-3:2011(E)Third edition2011-11-01ISO7267-3INTERNATIONAL STANDARDISO 7267-3:2011(E)C

2、OPYRIGHT PROTECTED DOCUMENT ISO 2011All 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 bel

3、ow or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in Switzerlandii ISO 2011 All rights reservedISO 7267-3:2011(E) ISO 2011 All rights reserved iiiConte

4、nts PageForeword ivIntroduction v1 Scope 12 Normative references .13 Terms and definitions .14 Time-interval between vulcanization/finished grinding and testing 25 Conditioning and temperature of test 26 Apparatus 27 Calibration .28 Procedure 39 Expression of results .310 Test report .3Annex A (norm

5、ative) Calibration schedule 6Bibliography .8ForewordISO (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 committees. Each member

6、 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 ISO, also take part in the work. ISO collaborates closely with the International Elect

7、rotechnical 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 task of technical committees is to prepare International Standards. Draft International Standards adopted

8、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.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent ri

9、ghts. ISO shall not be held responsible for identifying any or all such patent rights.ISO 7267-3 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis.This third edition cancels and replaces the second edition (ISO 7267-3:2007), of which i

10、t constitutes a minor revision to include an annex specifying a calibration schedule for the apparatus used.ISO 7267 consists of the following parts, under the general title Rubber-covered rollers Determination of apparent hardness: Part 1: IRHD method Part 2: Shore-type durometer method Part 3: Pus

11、ey and Jones methodISO 7267-3:2011(E)iv ISO 2011 All rights reservedIntroductionThe hardness of a roller covering has traditionally been determined on the finished roller, since it is this hardness that is critical to the correct functioning of the roller in its end application. Values of hardness,

12、determined by whichever method is chosen, are therefore dependent not only on the method employed and on the rubber, but also on the diameter of the roller, on the thickness of the covering and, in the case of thin coverings, on the nature of the roller core. For this reason the term “apparent hardn

13、ess” is used to distinguish between the values obtained by the methods described in the various parts of this International Standard and those that would be obtained for the rubber if it was possible to use the standard test methods for standard test pieces forming the subjects of other Internationa

14、l Standards.Since rollers vary considerably in size, construction and end use, and in view of the fact that hardness determinations are made for such different purposes as specification and factory process control, it has not been possible to standardize one test method. Consequently, three methods

15、are described, each capable of standing alone (see Foreword).ISO 7267-3:2011(E) ISO 2011 All rights reserved vINTERNATIONAL STANDARD ISO 7267-3:2011(E)Rubber-covered rollers Determination of apparent hardness Part 3:Pusey and Jones methodWARNING Persons using this part of ISO 7267 should be familiar

16、 with normal laboratory practice. This part of ISO 7267 does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.

17、IMPORTANT Certain procedures specified in this part of ISO 7267 might involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use.1 ScopeThis

18、 part of ISO 7267 specifies a method for the determination of the apparent hardness of vulcanized- or thermoplastic-rubber roller covers, expressed as the Pusey and Jones indentation value.The Pusey and Jones plastometer apparatus is used to measure the depth of indentation of an indentor under a sp

19、ecified force into the surface of the rubber. The indentation value should not be confused with hardness as measured by the international rubber hardness test method ISO 481, since in this method the rubber immediately adjacent to the indentor is precompressed. The Pusey and Jones indentation value

20、is an inverse measurement of hardness, i.e. the harder the rubber the lower the Pusey and Jones indentation value.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referen

21、ces, the latest edition of the referenced document (including any amendments) applies.ISO 18899:2004, Rubber Guide to the calibration of test equipmentISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purpose of th

22、is document, the following terms and definitions apply.3.1Pusey and Jones indentation valuedepth of indentation, in hundredths of a millimetre, of a ball 3,175 mm in diameter under a force of 9,8 N ISO 2011 All rights reserved 14 Time-interval between vulcanization/finished grinding and testingTests

23、 shall be carried out not less than 16 h after vulcanization and/or finished grinding and, for arbitration purposes, not less than 72 h after vulcanization (see ISO 23529).5 Conditioning and temperature of testWhere possible, the test shall be carried out at standard laboratory temperature in accord

24、ance with ISO 23529. The product under test should be maintained under the test condition for sufficient time to reach temperature equilibrium with the test environment. Where this is impracticable, the period of time and the conditions shall be given in the product specification (see the Note).The

25、same temperature shall be used throughout any one test or series of tests intended to be comparable.NOTE For large rollers having heavy metal cores, ambient conditions might not allow equilibrium temperatures to be obtained.6 Apparatus6.1 Plastometer, consisting of a supporting frame, an indentor, a

26、 mass for applying a fixed gravitational force on the indentor, a depth indicator and a specimen holder.6.1.1 Supporting frame, so configured that the indentor and mass can be independently raised or lowered vertically, permitting the indentor to rest on the surface of the test roller and the mass t

27、o be applied subsequently to the indentor.6.1.2 Indentor, consisting of a vertical steel shaft attached at the upper end to the spindle of the indicator gauge and having at the lower end a steel ball. The steel ball shall be (3,175 0,015) mm in diameter and shall be made of highly polished, non-corr

28、osive hard metal properly treated to resist wear.6.1.3 Mass, of (1 000 2) g.6.1.4 Depth indicator, comprising a dial gauge or other suitable device graduated in increments of 0,01 mm and having a range of at least 3 mm to indicate the movement of the indentor.6.1.5 Specimen holder, consisting of a c

29、lamp made of two metal plates held together by two threaded bolts as shown in Figure 1. The purpose of the clamp is to hold the test roller flat and free from slight movements that might introduce variations into the test. The top plate shall be provided with a hole and slot for the operation of the

30、 indentor.7 CalibrationThe test apparatus shall be calibrated in accordance with Annex A.ISO 7267-3:2011(E)2 ISO 2011 All rights reserved8 Procedure8.1 Firmly position the roller to be tested with its major axis horizontal and with the area in which the hardness is to be measured uppermost. Place th

31、e plastometer (6.1), with the axis of the indentor (6.1.2) vertical, on the roller over the position where the hardness is to be measured and lower the indentor into contact with the roller surface and until the gauge needle of the depth indicator (6.1.4) makes three revolutions. Adjust the dial gau

32、ge to read zero. Apply the indenting force by lowering the supporting frame (6.1.1) so that the mass (6.1.3) rests fully on the indentor as shown by a space of approximately 5 mm between the supporting plate and the shoulder of the mass tube. Read the amount of indentation on the gauge 60 s after th

33、e application of the force.8.2 Make three measurements, at different points at least 6 mm apart, within each test area in which the hardness is to be determined.NOTE Several test areas along the length and around the circumference of the roller might be required to determine the average hardness of

34、the covering and the hardness variation over a single roller (see ISO 6123-12).9 Expression of resultsExpress the apparent hardness as the median of three measurements for each test area, reported to the nearest whole number as the Pusey and Jones indentation value.10 Test reportThe test report shal

35、l include the following information:a) a full description of the roller and its origin;b) a full reference to the test method used, i.e. the reference number of this part of ISO 7267;c) test details:1) the time and temperature of conditioning prior to test,2) the temperature of test, if other than a

36、 standard laboratory temperature, and the relative humidity if necessary,3) details of any procedures not specified in this part of ISO 7267;d) test results:1) the number of areas or rollers tested,2) the individual test results,3) the apparent hardness, expressed as the Pusey and Jones indentation

37、value (see Clause 9);e) the date of the test.ISO 7267-3:2011(E) ISO 2011 All rights reserved 3Dimensions in millimetresa) Top plateb) Bottom plateISO 7267-3:2011(E)4 ISO 2011 All rights reservedc) Assembled viewKey1 threaded boltsaDrill to clear stud bolts.bTap for stud bolts.Figure 1 Holder for tes

38、t specimenISO 7267-3:2011(E) ISO 2011 All rights reserved 5Annex A (normative)Calibration scheduleA.1 InspectionBefore any calibration is undertaken, the condition of the items to be calibrated shall be ascertained by inspection and recorded on any calibration report or certificate. It shall be repo

39、rted whether calibration is carried out in the “as-received” condition or after rectification of any abnormality or fault.It shall be ascertained that the apparatus is generally fit for the intended purpose, including any parameters specified as approximate and for which the apparatus does not there

40、fore need to be formally calibrated. If such parameters are liable to change, then the need for periodic checks shall be written into the detailed calibration procedures.A.2 ScheduleVerification/calibration of the test apparatus is a mandatory part of this part of ISO 7267. However, the frequency of

41、 calibration and the procedures used are, unless otherwise stated, at the discretion of the individual laboratory, using ISO 18899 for guidance.The calibration schedule given in Table A.1 has been compiled by listing all of the parameters specified in the test method, together with the specified req

42、uirement. A parameter and requirement can relate to the main test apparatus, to part of that apparatus or to an ancillary apparatus necessary for the test.For each parameter, a calibration procedure is indicated by reference to ISO 18899, to another publication or to a procedure particular to the te

43、st method which is detailed (whenever a calibration procedure which is more specific or detailed than that in ISO 18899 is available, it shall be used in preference).The verification frequency for each parameter is given by a code-letter. The code-letters used in the calibration schedule are:C requi

44、rement to be confirmed, but no measurement;N initial verification only;S standard interval as given in ISO 18899.Table A.1 Calibration frequency scheduleParameter RequirementSubclause in ISO 18899:2004Verification frequency guideNotesPlastometer As specified in 6.1 C N Supporting frame As specified

45、in 6.1.1 C N IndentorPolished steel ball, diameter 3,175 mm 0,015 mm15.2 S Mass 1 000 g 2 g 22.2 S Depth indicatorRange of 3 mm graduated in 0,01 mm15.1 S Specimen holder As specified in 6.1.5 C N ISO 7267-3:2011(E)6 ISO 2011 All rights reservedIn addition to the items listed in Table A.1, use of th

46、e following is implied, all of which need calibrating in accordance with ISO 18899: a timer; a thermometer for monitoring the conditioning and test temperatures.ISO 7267-3:2011(E) ISO 2011 All rights reserved 7Bibliography1 ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)2 ISO 6123-1, Rubber or plastics covered rollers Specifications Part 1: Requirements for hardnessISO 7267-3:2011(E)8 ISO 2011 All rights reservedISO 7267-3:2011(E) ISO 2011 All rights reservedICS 83.140.99Price based on 8 pages