1、April 2017 English price group 13No 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 25.100.70!%c;“2649924www.din.deDIN
2、 ISO 6344-3Coated abrasives Grain size analysis Part 3: Determination of grain size distribution of microgrits P240 to P2500 (ISO 63443:2013),English translation of DIN ISO 6344-3:2017-04Schleifmittel auf Unterlagen Korngrenanalyse Teil 3: Bestimmung der Korngrenverteilung der Mikrokrnungen P240 bis
3、 P2500 (ISO 63443:2013),Englische bersetzung von DIN ISO 6344-3:2017-04Abrasifs appliqus Granulomtrie Partie 3: Dtermination de la distribution granulomtrique des micrograins P240 P2500 (ISO 63443:2013),Traduction anglaise de DIN ISO 6344-3:2017-04SupersedesDIN ISO 63443:200004www.beuth.deDocument c
4、omprises 29 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.04.17 A comma is used as the decimal marker. Contents Page3National Annex NA (informative) Bibliography 4National foreword1 Scope . 52 Normative references 53 Terms an
5、d definitions . 54 Testing of microgrits P240 to P1200 . 54.1 General . 54.2 Designation of the test method . 64.3 Test procedure using the US sedimentation tube . 65 Testing of microgrits P1500 to P2500 .215.1 General 215.2 Designation of the test method 225.3 Test procedure 226 Designation .247 Ma
6、rking .24Annex A (informative) Form for recording results of a sedimentation analysis of microgrits of the P series using the US sedimentometer .25Annex B (informative) Example of the presentation of the test data for the grain size distribution of fused aluminium oxide .27Bibliography .29DIN ISO 63
7、44-3:2017-04 2 DIN ISO 6344-3:2017-04 3 National foreword This document (ISO 6344-3:2013) has been prepared by Technical Committee ISO/TC 29, Subcommittee SC 5 “Grinding wheels and abrasives” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss
8、 Werkzeuge und Spannzeuge (DIN Standards Committee Tools and Clamping Devices), Working Committee NA 121-04-06 AA “Grain characteristics”. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for ident
9、ifying any or all such patent rights. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 6344-1:1999 DIN ISO 6344-1:2000-04 EN ISO 6344 consists of the following parts, under the general title Coated abrasives Grain size analysis: Part 1:
10、Grain size distribution test Part 2: Determination of grain size distribution of macrogrits P12 to P220 Part 3: Determination of grain size distribution of macrogrits P240 to P2500 Amendments This standard differs from DIN ISO 6344-3:2000-04 as follows: a) new terms and definitions have been include
11、d 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 facilitate the use of this part of ISO 6344; c) the Bibliography has been updated. Previous editions DIN 69176-4: 1977
12、-08 DIN 69176-3: 1985-03 DIN ISO 6344-3: 2000-04 National Annex NA(informative)BibliographyDIN ISO 6344-1:2000-04, Coated abrasives Grain size analysis Part 1: Grain size distribution test (ISO 6344-1:1998) DIN ISO 6344-3:2017-04 4 Coated abrasives Grain size analysis Part 3: Determination of grain
13、size distribution of microgrits P240 to P25001 ScopeThis part of ISO 6344 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 gri
14、ts used in the manufacture of coated abrasive products and to those grits taken from products for testing purposes.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
15、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6344-1:1998, Coated abrasives Grain size analysis Part 1: Grain size distribution test3 Terms and definitionsFor the purposes of this document, the following terms and
16、 definitions apply.3.1microgritabrasive grit having a median equivalent diameter of 58,5 m to 8,4 m, whose grain size distribution is determined by sedimentation3.2grain size distributionpercentage of grains of different sizes composing the macrogrit or microgrit4 Testing of microgrits P240 to P1200
17、4.1 GeneralThe testing of microgrits P240 to P1200 by sedimentation 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.DIN ISO 6344-3:2017-0
18、4 5 Table 1 Grain size distribution of microgrits P240 to P1200 ds-values for testing with the US sedimentometerGrit designationds0value max. mds3value max. mMedian grain size ds50values mds95value min. mP240 110 81,7 58,5 2,0 44,5P280 101 74,0 52,2 2,0 39,2P320 94 66,8 46,2 1,5 34,2P360 87 60,3 40,
19、5 1,5 29,6P400 81 53,9 35,0 1,5 25,2P500 77 48,3 30,2 1,5 21,5P600 72 43,0 25,8 1,0 18,0P800 67 38,1 21,8 1,0 15,1P1000 63 33,7 18,3 1,0 12,4P1200 58 29,7 15,3 1,0 10,2The permissible deviations are given in Table 2.Table 2 Permissible deviations resulting from the variations due to the measuring te
20、chnique (US sedimentometer)Grit designationPermissible deviation fords3mds50mds95mP240+1,5 1,5 1,5P280P320P360+1,5 1,0 1,5P400P500P600+1,5 0,8 1,5P800P1000P12004.2 Designation of the test methodThe designation of the test method by means of the US sedimentometer for microgrits P240 to P1200 is as fo
21、llows: Test method Micro P4.3 Test procedure using the US sedimentation tube4.3.1 Testing by sedimentationThe testing of microgrits P240 to P1200 by sedimentation shall be carried out using the US sedimentation tube whereby the grain size distribution is determined.The principle of measurement is to
22、 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.DIN ISO 6344-3:2017-04 6 The grain size distribution of microgrits P240 to P1200 is determined using the following criteria:
23、a) the maximum grains diameter (theoretical grain diameter) of the first sedimented grain (ds0value) shall not exceed the maximum permissible ds0value;b) the grain diameter (theoretical grain diameter) shall not exceed the maximum permissible ds3value at the 3 % point of the grain size distribution
24、curve;c) the median grain diameter (theoretical grain diameter) shall be within the specified tolerances of the ds50value at the 50 % point of the grain size distribution curve;d) the grain diameter (theoretical grain diameter) shall at least attain the ds95value at the 95 % point of the grain size
25、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 apparatusThe US sedimentation tube consists of a vertical sedimentation tube of 940 mm in length and of 20 mm inside diameter. It is surr
26、ounded 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 frame, the base plate of which is fitted with level adjusting screws for keeping the tube vertica
27、l (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 magnifying glass be used. A time printer renders the recording of the sedimentation times easier.D
28、IN ISO 6344-3:2017-04 7 Dimensions in millimetresKey1 methyl alcohol level (initial)2 sedimentation tube3 water jacket4 thermometer5 collecting tube (see Figure 5)6 rubber centring spacer7 scale for height of sedimentation8 rubber gasket9 vertical adjusting screwsaWater inlet.bWater outlet.Figure 1
29、US sedimentation tubeDIN ISO 6344-3:2017-04 8 Dimensions in millimetresKeyDial graduation and figures shall be in white.50 division marks at equal intervals (graduation about 1 mm).Length of division mark: 3 mmEvery fifth division mark: 4 mmThickness of division mark: 0,25 mmFigure 2 Collecting tube
30、4.3.3 Test equipment4.3.3.1 Sedimentation mediumUse methyl alcohol of 95 % up to 99 % purity as the sedimentation medium.Adjust the sedimentation medium using the checking minerals specified in 4.3.4.1.3.4.3.3.2 Dispersing agentIn order to avoid grain agglomeration, a dispersing agent, such as EDTA
31、(tetrasodium salt of ethylendiamine tetra-acetic acid), shall be added to the methyl alcohol, i.e. 4 ml of a 1 % aqueous EDTA-solution per litre of methyl alcohol.DIN ISO 6344-3:2017-04 9 4.3.3.3 Checking mineralsThe adjustment of the whole measuring procedure should be controlled by means of checki
32、ng minerals 280 and 320. Each supply of checking 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 distribu
33、tions of the checking minerals do not correspond to identical grain sizes of this part of ISO 6344.Table 3 Grain diameter of checking mineralsVolume fraction of the settled checking minerals%Grain diameter d m Checking mineral280 3200 74,7 75,13 62,1 58,710 52,9 1,06 49,8 120 47,9 0,96 44,2 0,8830 4
34、4,7 0,89 40,5 0,8140 42 0,84 37,5 0,7550 39,7 0,79 34,9 0,760 37,4 32,570 35 30,180 32,3 27,590 28,8 24,4100 20 16,5DIN ISO 6344-3:2017-04 10 KeyY volume fraction, %X grain diameter, d, mFigure 3 Cumulative volume grain size distribution curve of checking minerals 280 and 3204.3.4 Testing4.3.4.1 Pre
35、paration for testing4.3.4.1.1 Setting up test deviceWhen 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 the top of the colle
36、cting 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 base plate.After adjustm
37、ent, fill the water jacket and connect it to a thermostat.4.3.4.1.2 Test temperatureThe 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 indicated in Tables 4 and 5
38、for the respective times of sedimentation apply to this temperature only.DIN ISO 6344-3:2017-04 11 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 mediumThe methyl alcohol used for the test shall be adjusted by means of
39、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. The average of the algebraic sum of the deviations shall not exceed 0
40、,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 Test procedure4.3.4.2.1 Filling of sedimentation tubeFill the sedimentation
41、 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 the thermostat and the sedimentation tube temperatures.4.3.4.2.2 Preparat
42、ion of the samplePrior 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 samplePlace 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.
43、For silicon carbide, this will be about 1,6 g; while for fused aluminium oxide it will be about 2,2 g.It is recommended that the dispersed sample be submitted to ultrasonic treatment to remove agglomerates.Transfer 15 ml of sedimentation medium containing the specified quantity of dispersing agent a
44、nd the sample to be settled to a test tube and shake the test tube to achieve complete dispersion. Allow the grit to stand in the sedimentation medium for at least 30 min and then again shake the test tube vigorously several times during this period. The temperature of the medium shall be the same a
45、s the temperature of the medium in the sedimentation tube.4.3.4.2.4 Transfer to sedimentation tubePlace a suitable funnel in the sedimentation tube. Shake the test-tube containing the sample and the sedimentation liquid vigorously for at least 30 s. Then, pour its contents onto the sedimentation liq
46、uid, down the slope of the funnel.Subsequently, quickly remove the funnel from the sedimentation tube in order to prevent any residue from dropping into the tube as this would distort the results.4.3.4.2.5 Start of measurementMeasurement shall begin at the time of transfer.DIN ISO 6344-3:2017-04 12 Table 4 Theoretical grain diameter, d, for grits of fused aluminium oxide as a function of time of sedimentation, t, when using methyl alcohol as sedimentation medium at test temperature 25 Ct d t d T d
