1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6344-3:2013 Coated abrasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P2500BS ISO 6344-3:2013 BRITISH STANDARD Nationa
2、l foreword This British Standard is the UK implementation of ISO 6344-3:2013. It supersedes BS ISO 6344-3:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MTE/13, Grinding wheels, abrasive tools, paper and cloths, and powders. A list of organizati
3、ons represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 I
4、SBN 978 0 580 70616 5 ICS 25.100.70 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2013. Amendments issued since publication Date Text affectedBS ISO 63
5、44-3:2013 ISO 2013 Coated abrasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P2500 Abrasifs appliqus Granulomtrie Partie 3: Dtermination de la distribution granulomtrique des micrograins P240 P2500 INTERNATIONAL STANDARD ISO 6344-3 Second edition 201
6、3-05-01 Reference number ISO 6344-3:2013(E)BS ISO 6344-3:2013ISO 6344-3:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, elect
7、ronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.
8、+ 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 6344-3:2013ISO 6344-3:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Testing of microgrits P240 to P1
9、200 . 1 4.1 General . 1 4.2 Designation of the test method . 2 4.3 Test procedure using the US sedimentation tube . 2 5 Testing of microgrits P1500 to P2500 .17 5.1 General 17 5.2 Designation of the test method 18 5.3 Test procedure 18 6 Designation .20 7 Marking .20 Annex A (informative) Form for r
10、ecording results of a sedimentation analysis of microgrits of the P series using the US sedimentometer .21 Annex B (informative) Example of the presentation of the test data for the grain size distribution of fused aluminium oxide .23 Bibliography .25BS ISO 6344-3:2013ISO 6344-3:2013(E) Foreword ISO
11、 (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 body interested in a subject for which a technical com
12、mittee 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 Electrotechnical Commission (IEC) on all matters of electrot
13、echnical 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 by the technical committees are circulated to the mem
14、ber 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 rights. ISO shall not be held responsible for identify
15、ing any or all such patent rights. ISO 6344-3 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 5, Grinding wheels and abrasives. This second edition cancels and replaces the first edition (ISO 6344-3:1998). It also incorporates the Technical Corrigendum ISO 6344-3:1998/Cor
16、r.1:1999. The significant changes against ISO 6344-3:1998 are the following: a) new definitions have been included in Clause 3; b) the test procedure in 4.3 has been completely updated; requirements for the use of the US sedimentation tube have replaced the reference to ISO 8486-2, in order to facil
17、itate the use of this part of ISO 6344; c) Bibliography has been added. ISO 6344 consists of the following parts, under the general title Coated abrasives Grain size analysis: Part 1: Grain size distribution test Part 2: Determination of grain size distribution of macrogrits P12 to P220 Part 3: Dete
18、rmination of grain size distribution of microgrits P240 to P2500iv ISO 2013 All rights reservedBS ISO 6344-3:2013INTERNATIONAL ST ANDARD ISO 6344-3:2013(E) Coated abrasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P2500 1 Scope This part of ISO 6344
19、specifies a method for determining or testing the grain size distribution of electro-fused aluminium oxide and silicon carbide microgrits P240 to P2500 for coated abrasives as defined in ISO 6344-1. It applies both to those grits used in the manufacture of coated abrasive products and to those grits
20、 taken from products for testing purposes. 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 t
21、he referenced document (including any amendments) applies. ISO 6344-1:1998, Coated abrasives Grain size analysis Part 1: Grain size distribution test 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 microgrit abrasive grit having a median e
22、quivalent diameter of 58,5 m to 8,4 m, whose grain size distribution is determined by sedimentation 3.2 grain size distribution percentage of grains of different sizes composing the macrogrit or microgrit 4 Testing of microgrits P240 to P1200 4.1 General The testing of microgrits P240 to P1200 by se
23、dimentation shall be carried out using the US sedimentometer whereby the grain size distribution is determined; see 4.3.1. The limits are specified in ISO 6344-1:1998, Table 2, which is reproduced as (the following) Table 1. ISO 2013 All rights reserved 1BS ISO 6344-3:2013ISO 6344-3:2013(E) Table 1
24、Grain size distribution of microgrits P240 to P1200 d s -values for testing with the US sedimentometer Grit designation d s0value max. m d s3value max. m Median grain size d s50values m d s95value min. m P240 110 81,7 58,5 2,0 44,5 P280 101 74,0 52,2 2,0 39,2 P320 94 66,8 46,2 1,5 34,2 P360 87 60,3
25、40,5 1,5 29,6 P400 81 53,9 35,0 1,5 25,2 P500 77 48,3 30,2 1,5 21,5 P600 72 43,0 25,8 1,0 18,0 P800 67 38,1 21,8 1,0 15,1 P1000 63 33,7 18,3 1,0 12,4 P1200 58 29,7 15,3 1,0 10,2 The permissible deviations are given in Table 2. Table 2 Permissible deviations resulting from the variations due to the m
26、easuring technique (US sedimentometer) Grit designation Permissible deviation for d s3m d s50m d s95m P240 +1,5 1,5 1,5 P280 P320 P360 +1,5 1,0 1,5 P400 P500 P600 +1,5 0,8 1,5 P800 P1000 P1200 4.2 Designation of the test method The designation of the test method by means of the US sedimentometer for
27、 microgrits P240 to P1200 is as follows: Test method Micro P 4.3 Test procedure using the US sedimentation tube 4.3.1 Testing by sedimentation The testing of microgrits P240 to P1200 by sedimentation shall be carried out using the US sedimentation tube whereby the grain size distribution is determin
28、ed. The principle of measurement is to determine the volumes of a suspension of the grit sample settled in the collecting tube as a function of time, and to calculate the equivalent grain diameter using Stokes law.2 ISO 2013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E) The grain size dist
29、ribution of microgrits P240 to P1200 is determined using the following criteria: a) the maximum grains diameter (theoretical grain diameter) of the first sedimented grain (d s0value) shall not exceed the maximum permissible d s0value; b) the grain diameter (theoretical grain diameter) shall not exce
30、ed the maximum permissible d s3value at the 3 % point of the grain size distribution curve; c) the median grain diameter (theoretical grain diameter) shall be within the specified tolerances of the d s50value at the 50 % point of the grain size distribution curve; d) the grain diameter (theoretical
31、grain diameter) shall at least attain the d s95value at the 95 % point of the grain size distribution curve. The four criteria shall be met at the same time. The values are specified in Table 1. The permissible deviations are given in Table 2. 4.3.2 Test apparatus The US sedimentation tube consists
32、of a vertical sedimentation tube of 940 mm in length and of 20 mm inside diameter. It is surrounded by a water jacket in which the water temperature is maintained at a constant level. A graduated collecting tube is fixed at the bottom of the sedimentation tube. The whole assembly is mounted on a fra
33、me, the base plate of which is fitted with level adjusting screws for keeping the tube vertical (see Figure 1). For the design and dimensions of the collecting tube, see Figure 2. To improve the accuracy of sedimentation volume readings, it is recommended that a horizontal beam light source and a ma
34、gnifying glass be used. A time printer renders the recording of the sedimentation times easier. ISO 2013 All rights reserved 3BS ISO 6344-3:2013ISO 6344-3:2013(E) Dimensions in millimetres Key 1 methyl alcohol level (initial) 2 sedimentation tube 3 water jacket 4 thermometer 5 collecting tube (see F
35、igure 5) 6 rubber centring spacer 7 scale for height of sedimentation 8 rubber gasket 9 vertical adjusting screws a Water inlet. b Water outlet. Figure 1 US sedimentation tube4 ISO 2013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E) Dimensions in millimetres Key Dial graduation and figures
36、shall be in white. 50 division marks at equal intervals (graduation about 1 mm). Length of division mark: 3 mm Every fifth division mark: 4 mm Thickness of division mark: 0,25 mm Figure 2 Collecting tube 4.3.3 Test equipment 4.3.3.1 Sedimentation medium Use methyl alcohol of 95 % up to 99 % purity a
37、s the sedimentation medium. Adjust the sedimentation medium using the checking minerals specified in 4.3.4.1.3. 4.3.3.2 Dispersing agent In order to avoid grain agglomeration, a dispersing agent, such as EDTA (tetrasodium salt of ethylendiamine tetra-acetic acid), shall be added to the methyl alcoho
38、l, i.e. 4 ml of a 1 % aqueous EDTA- solution per litre of methyl alcohol. ISO 2013 All rights reserved 5BS ISO 6344-3:2013ISO 6344-3:2013(E) 4.3.3.3 Checking minerals The adjustment of the whole measuring procedure should be controlled by means of checking minerals 280 and 320. Each supply of checki
39、ng minerals is accompanied by a cumulative volume grain size distribution curve (see Figure 3). The 10 %, 20 %, 30 %, 40 % and 50 % points shall not deviate by more than 0,5 micrometres (m) from the sizes indicated in Table 3. NOTE The grain size distributions of the checking minerals do not corresp
40、ond to identical grain sizes of this part of ISO 6344. Table 3 Grain diameter of checking minerals Volume fraction of the settled checking minerals % Grain diameter d m Checking mineral 280 320 0 74,7 75,1 3 62,1 58,7 10 52,9 1,06 49,8 1 20 47,9 0,96 44,2 0,88 30 44,7 0,89 40,5 0,81 40 42 0,84 37,5
41、0,75 50 39,7 0,79 34,9 0,7 60 37,4 32,5 70 35 30,1 80 32,3 27, 5 90 28,8 24,4 100 20 16,56 ISO 2013 All rights reservedBS ISO 6344-3:2013ISO 6344-3:2013(E) Key Y volume fraction, % X grain diameter, d, m Figure 3 Cumulative volume grain size distribution curve of checking minerals 280 and 320 4.3.4
42、Testing 4.3.4.1 Preparation for testing 4.3.4.1.1 Setting up test device When setting up the US sedimentometer for use as the test device, check that the collecting tube is positioned centrally in the sedimentation tube. It is held in the vertical position by a rubber spacer located about 30 mm from
43、 the top of the collecting tube. Check this using a plumb line suspended from the top of the sedimentation tube and the collecting tube. The plumb line shall pass centrally through both the sedimentation tube and the collecting tube. The device is adjusted by means of the adjusting screws on the bas
44、e plate. After adjustment, fill the water jacket and connect it to a thermostat. 4.3.4.1.2 Test temperature The testing of the grain size shall be carried out under constant temperature with a permissible deviation of 0,1 C. It is convenient to use a test temperature of 25 C. The grain diameters ind
45、icated in Tables 4 and 5 for the respective times of sedimentation apply to this temperature only. ISO 2013 All rights reserved 7BS ISO 6344-3:2013ISO 6344-3:2013(E) For the determination of the grain diameters for other test temperatures, see 4.3.5.1. 4.3.4.1.3 Adjustment of the sedimentation mediu
46、m The methyl alcohol used for the test shall be adjusted by means of one of the two checking minerals, 280 or 320. The grain sizes corresponding to 10 %, 20 %, 30 %, 40 % and 50 % points shall not deviate by more than 0,5 m from the values specified on the curves supplied with the checking minerals.
47、 The average of the algebraic sum of the deviations shall not exceed 0,3 m. If agreement with the accompanying curves is not reached within the permissible tolerances, then the density and viscosity of the sedimentation medium shall be changed in such a way so that agreement is obtained. 4.3.4.2 Tes
48、t procedure 4.3.4.2.1 Filling of sedimentation tube Fill the sedimentation tube with the previously adjusted sedimentation liquid to a height of 1 000 mm 2 mm (measured from the bottom of the collecting tube). Then, allow it to stand until equilibrium is reached between the water jacket connected to
49、 the thermostat and the sedimentation tube temperatures. 4.3.4.2.2 Preparation of the sample Prior to the test, the sample shall be heated to a temperature of 600 C 20 C for at least 10 min. 4.3.4.2.3 Dispersion of the sample Place a sufficient amount of the sample in a test tube such that a height of 20 to 25 divisions in the collecting tube after sedimentation is obtained. For silicon carbide, this will be about 1,6 g; while for fused
