1、April 2012 Translation by DIN-Sprachendienst.English price group 16No 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
2、25.100.70!$:#“1882300www.din.deDDIN ISO 8486-2Bonded abrasives Determination and designation of grain size distribution Part 2: Microgrits F230 to F2000 (ISO 8486-2:2007)English translation of DIN ISO 8486-2:2012-04Schleifkrper aus gebundenem Schleifmittel Bestimmung und Bezeichnung der Korngrenvert
3、eilung Teil 2: Mikrokrnungen F230 bis F2000 (ISO 8486-2:2007)Englische bersetzung von DIN ISO 8486-2:2012-04Abrasifs agglomrs Dtermination et dsignation de la distribution granulomtrique Partie 2: Micrograins de F230 F2000 (ISO 8486-2:2007)Traduction anglaise de DIN ISO 8486-2:2012-04SupersedesDIN I
4、SO 8486-2:1997-09www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.3603.12 A comma is used as the decimal marker. Contents Page National foreword .3 National Annex NA (informative) Bibliography 4 1 Scope 5 2 Normative references 5 3
5、Terms and definitions .5 4 Method of checking grain size distribution 5 4.1 Grain size distribution .5 4.2 Grading .7 5 Testing microgrits F230 to F2000 9 5.1 General 9 5.2 Permissible deviations 9 5.3 Designation of test method . 10 6 Test methods. 11 6.1 Test method based on Micro-F-Mastergrits .
6、11 6.2 US sedimentation tube . 17 7 Designation . 28 8 Marking 29 Annex A (informative) Electrical resistance method 33 Annex B (informative) Form for recording results of sedimentation analysis of microgrits of F series using US sedimentation tube . 35 Annex C (informative) Example of presentation
7、of test data for grain size distribution of fused aluminium oxide 36 2 DIN ISO 8486-2:2012-04 National foreword The text of ISO 8486-2:2007 has been adopted in this standard without any modification. This standard has been prepared by Technical Committee ISO/TC 29 “Small tools”, Subcommittee SC 5 “G
8、rinding wheels and abrasives” of Working Group WG 7 “Grain characteristics”. This second edtion cancels and replaces the first edition (ISO 8486-2:1996), which has been technically revised. The responsible German body involved in its preparation was the Normenausschuss Werkzeuge und Spannzeuge (Tool
9、s and Clamping Devices Standards Committee), Working Committee NA 121-04-06 AA Krnungen. DIN ISO 8486 Bonded abrasives Determination and designation of grain size distribution consists of the following parts: Part 1: Macrogrits F4 to F220 Part 2: Microgrits F230 to F2000 The DIN Standard correspondi
10、ng to the International Standard referred to in Clause 2 of the EN is as follows: ISO 8486-1 DIN ISO 8486-1 Amendments This standard differs from DIN ISO 8486-2:1997-09 as follows: a) the scope of the standard has been extended to include microgrits up to F2000; b) criteria for determination of grai
11、n size distribution have been specified; c) the test method using a photosedimentometer is no longer included; d) the X-ray test method and the electrical resistance test method have been added; e) the temperature range for the method using the US sedimentation tube has been extended; f) the standar
12、d has been editorially revised. Previous editions DIN 69176-4: 1977-08 DIN 69101-1: 1981-03, 1985-12 DIN 69101-3: 1985-12 DIN 69101-3 Supplement 1: 1985-12 DIN 69176-3: 1985-03 DIN ISO 8486-2: 1997-09 3 DIN ISO 8486-2:2012-04 National Annex NA (informative) Bibliography DIN ISO 8486-1, Bonded abrasi
13、ves Determination and designation of grain size distribution Part 1: Macrogrits F4 to F220 4 DIN ISO 8486-2:2012-04 1 Scope This part of ISO 8486 sets forth a method for determining or checking the size distribution of microgrits F230 to F2000 in fused aluminium oxide and silicon carbide. It specifi
14、es the grit designation for the testing of those grits used in the manufacture of bonded abrasive products and general industrial applications and those removed from bonded products, as well as loose grits used in polishing. 2 Normative references The following referenced documents are indispensable
15、 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 amendments) applies. ISO 8486-1, Bonded abrasives Determination and designation of grain size distribution Part 1: Macrogr
16、its F4 to F220 3 Terms and definitions For the purposes of this document, terms and definitions given in ISO 8486-1 and the following apply. 3.1 microgrits grits with grain size distributions that are determined by sedimentation and mean grain sizes (ds50) of 60 m or less 4 Method of checking grain
17、size distribution 4.1 Grain size distribution The grain size distribution of microgrits F230 to F2000 is determined according to the following criteria: a) the grain size (theoretical grain diameter) shall not exceed the maximum permissible ds3value at the 3 % point of the grain size distribution cu
18、rve; b) the median size (theoretical grain diameter) shall be within the specified tolerances of the ds50value at the 50 % point of the grain size distribution curve; Bonded abrasives Determination and designation of grain size distribution Part 2: Microgrits F230 to F2000 5 DIN ISO 8486-2:2012-04 c
19、) the grain size (theoretical grain diameter) shall attain at least the ds80, ds94/95values at the 80 % and 94/95 % points of the grain size distribution curve. The three criteria shall be met simultaneously. The values are specified in Table 1 for a photosedimentometer (94 %) and in Table 2 for a U
20、S sedimentation tube (95 %). The testing of microgrits F230 to F2000 is to be carried out by sedimentation according to Clause 5. Table 1 Grain size distribution of microgrits F230 to F2000 based on photosedimentometer and mastergrits (see 6.1) Grit designation ds3value max. m Median grain size ds50
21、value m ds80value min. m ds94value min. m F230 82 53 3 34 F240 70 44,5 2 28 F280 59 36,5 1,5 22 F320 49 29,2 1,5 16,5 F360 40 22,8 1,5 12 F400 32 17,3 1 8 F500 25 12,8 1 5 F600 19 9,3 1 3 F800 14 6,5 1 2 F1000 10 4,5 0,8 1 F1200 7 3 0,5 1 F1500 5 2 0,4 0,8 F2000 3,5 1,2 0,3 0,5 6 DIN ISO 8486-2:2012
22、-04 Table 2 Grain size distribution of microgrits F230 to F1200 based on US sedimentation tube and checking minerals Grit designation ds3value max. m Median grain size ds50value m ds80value min. m ds95value min. m F230 77 55,7 3 38 F240 68 47,5 2 32 F280 60 39,9 1,5 25 F320 52 32,8 1,5 19 F360 46 26
23、,7 1,5 14 F400 39 21,4 1 10 F500 34 17,1 1 7 F600 30 13,7 1 4,6 F800 26 11 1 3,5 F1000 23 9,1 0,8 2,4 F1200 20 7,6 0,5 2,4 NOTE These values were calculated based on ISO round-robin tests. 4.2 Grading The F series is a graduated series of thirteen microgrits, starting at a median particle size of 53
24、 m and ending at 1,2 m, as determined by a photosedimentometer. This series follows on from the finest grain in the F series macrogrits F220 (63 m) and uses the same ratio as that series, i.e. 42. The calculation of the individual grain size values (see Table 3) has been made as follows: a) the rati
25、o of the median grain sizes F230 and F240 is 402 f , i.e. it corresponds approximately to the progressive ratio of the test sieves for macrogrits; b) the ratio of the median grain sizes of the following grits F240 and F280 is 412 f ; c) the ratio of the succeeding grain sizes is 42nf where n = 1, 2,
26、 3, 4, 5, 6, 7, 8, 9, 10, 11 and where the following equation applies to the factor f : ()()124(0 1 2 3 . 11)1266453 1,2 2531, 0 2 61, 2 2ff+ +=This produces a series of ratios starting at 1,189 and ending at 1,581. 7 DIN ISO 8486-2:2012-04 Table 3 Calculation of the f nfactors (photosedimentation)
27、Grit designation Median grain size m Formula F230 53 Starting point F240 44,5 0453 1144,52f = F280 36,5 1444,5 136,52f = F320 29,2 2436,5 129,2f = F360 22,8 3429,2 122,82f = F400 17,3 4422,8 117,32f = F500 12,8 5417,3 112,82f = F600 9,3 6412,8 19,32f = F800 6,5 749,3 16,52f = F1000 4,5 846,5 14,52f
28、= F1200 3 944,5 132f = F1500 2 1043122f = F2000 1,2 114211, 22f = 8 DIN ISO 8486-2:2012-04 N1)N2)N1) National footnote: In the original ISO document, this value erroneously reads “29,5”. This has been corrected to read “29,2” both in the English and in the German version (see also Table 1). N2) Nati
29、onal footnote: In the original ISO document a value of “29,5” is erroneously given in the first denominator of the equation. This has been corrected to read “29,2” both in the English and in the German version (see also Table 1). 25 Testing microgrits F230 to F2000 5.1 General Microgrits F230 to F20
30、00 are tested by means of sedimentation. The criteria for determining the grain size distribution are a) the theoretical grain size at the 3 % point of the grain size distribution curve (ds3value), b) the theoretical grain size at the 50 % point of the grain size distribution curve (ds50value), and
31、c) the theoretical grain size at the 80 %, 94/95 % point of the grain size distribution curve (ds80, ds94/95values). 5.2 Permissible deviations When retesting the measured results, allowance shall be made for the variations due to the measuring technique (sampling, sample preparation, different oper
32、ators and instruments). These permissible deviations, given in Tables 4 and 5, have been determined on the basis of the standard deviation resulting from a cooperative test carried out by the members of ISO TC 29/SC 5. The tolerances given in Tables 1 or 2 are to be increased by these values. Table
33、4 Permissible deviations resulting from variations due to measuring technique Method based on mastergrits (Determination, for example, by sedimentation or electrical resistance method) Dimensions in micrometres Permissible deviations for values Grit designation ds3ds50ds80ds94F230 F240 + 3,5 2,5 1,5
34、 F280 F320 F360 F400 + 2,5 1,5 0,8 F500 F600 F800 + 2 1 0,5 F1000 0,4 F1200 + 1,5 0,5 0,4 F1500 + 1,0 0,4 0,3 F2000 + 1,0 0,3 0,2 9 DIN ISO 8486-2:2012-04 Table 5 Permissible deviations resulting from the variations due to the measuring technique US sedimentation tube method Dimensions in micrometre
35、s Permissible deviations for the values Grit designation ds3ds50ds80ds95F230 F240 + 1,5 1,5 1,5 F280 F320 F360 F400 + 1,5 1 1,5 F500 F600 F800 + 1,5 0,8 1,5 F1000 1,5 F1200 + 1,5 0,5 1,5 5.3 Designation of test method The designation of the method for testing microgrits F230 to F2000 shall include a
36、n indication of the measuring instrument used: test-MICRO F Sedigraph series1); test-MICRO F US sedimentation tube1); test-MICRO F Coulter counter1). 1) Sedigraph, US sedimentation tube and Coulter counter are examples of suitable products available commercially. This information is given for the co
37、nvenience of users of this part of ISO 8486 and does not constitute an endorsement by ISO of these products. 10 DIN ISO 8486-2:2012-04 6 Test methods 6.1 Test method based on Micro-F-Mastergrits Each of the Micro-F-Mastergrits 2)(hereafter referred to as “mastergrit”)used in testing is accompanied b
38、y a certificate of the Staatliche Materialprfungsanstalt Darmstadt (MPA) stating the value at the 50 % point determined by means of a cooperative test carried out by the members of ISO TC 29/SC 5. The values measured shall be corrected on the basis of the mastergrit values. The determination of grai
39、n sizes by use with other principles of measurement than sedimentation may give deviating results. 6.1.1 Preparation of the sample It is recommended that the sample be dispersed by means of ultrasonics. 6.1.2 Test procedure The test shall be carried out in accordance with the instructions for the me
40、asuring instrument used. 6.1.3 Evaluation 6.1.3.1 Determination of grain size distribution The principle upon which this part of ISO 8486 is based is the comparison of the median ds50(50 % by volume weight) point given by the mastergrit with that determined by the testing laboratory on its own instr
41、uments. The difference between these two values is also to be added algebraically to the 3 %, 50 %, 80 % or 94/95 % values of the sample. The following procedure applies: a) determine the ds50value of the mastergrit, and calculate the difference between this value and the corresponding value shown o
42、n the MPA Darmstadt certificate; b) measure the ds3, ds50, ds80or ds94/95values of the sample and add, algebraically, the mastergrit difference as determined above; c) compare the corrected measured results with the values in Table 1. EXAMPLE SiC F240, for the ds50value: Mastergrit (MG): MG - ds50va
43、lue according to MPA certificate 44,9 m MG - ds50value measure 42,3 m Difference + 2,6 m Sample: Value measured 42,8 m To be added + 2,6 m Corrected value of the sample 45,4 m From Table 1, this value is within the tolerances of the ds50value for grit F240. 2) Micro-F-Mastergrits, of fused aluminium
44、 oxide and silicon carbide, can be obtained from the Staatliche Materialprfungsanstalt Darmstadt, Grafenstrae 2, 64283 Darmstadt, Germany. This information is given for the convenience of users of this part of ISO 8486 and does not constitute an endorsement by ISO of the product named. Equivalent pr
45、oducts may be used if they can be shown to lead to the same results. 11 DIN ISO 8486-2:2012-04 6.1.3.2 Evaluation of corrected test results A sample complies with this part of ISO 8486 if the corrected values for ds3, ds50, ds80or ds94/95are within the permissible limits given in Table 1 or 2. When
46、retesting a material, allowance shall be made for the variation due to the measuring techniques. The limit deviations given in Tables 1 or 2 are to be amended by the values given in Tables 4 or 5. 6.1.4 Measuring apparatus 6.1.4.1 X-ray gravitational technique 6.1.4.1.1 General The X-ray gravitation
47、al technique is a method for the determination of the particle size distribution of a powder dispersed in a liquid using gravity sedimentation. The measurement of the concentration of solids setting in a liquid suspension is achieved by monitoring the incremental signal absorption from a beam of X-rays. The method of determining the particle size distribution is applicable to powders which can be dispersed in liquids or powders which are present in slurry form. The typical particle size range for analysis is from about 0,1 m to about 300 m. The method is typi
