1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58size distribution Part 2: Microgrits F230 to F2000ICS 25.100.70Bonded abrasives Determination and d
2、esignation of grain BRITISH STANDARDBS ISO 8486-2:2007BS ISO 8486-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 55767 5Amendments issued since publicationAmd. No. Date Commentscontract. Users are
3、responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of ISO 8486-2:2007. It supersedes BS ISO 8486-2:1996 which is withdrawn. The UK participation in its preparation wa
4、s entrusted to Technical Committee MTE/13, Grinding wheels, abrasive tools, paper and cloths, and powders.A list of organizations 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 Reference numberI
5、SO 8486-2:2007(E)INTERNATIONAL STANDARD ISO8486-2Second edition2007-08-01Bonded abrasives Determination and designation of grain size distribution Part 2: Microgrits F230 to F2000 Abrasifs agglomrs Dtermination et dsignation de la distribution granulomtrique Partie 2: Micrograins F230 F2000 BS ISO 8
6、486-2:2007ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Method of checking grain size distribution 1 4.1 Grain size distribution 1 4.2 Grading 3 5 Testing microgrits F230 to F2000 5 5.1 General. 5 5.2 Permissible deviations. 5 5.3 Designation of
7、test method . 6 6 Test methods. 7 6.1 Test method based on Micro-F-Mastergrits. 7 6.2 US sedimentation tube. 13 7 Designation . 24 8 Marking 25 Annex A (informative) Electrical resistance method 29 Annex B (informative) Form for recording results of sedimentation analysis of microgrits of F series u
8、sing US sedimentation tube 31 Annex C (informative) Example of presentation of test data for grain size distribution of fused aluminium oxide 32 BS ISO 8486-2:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member b
9、odies). 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 committee has been established has the right to be represented on that committee. International organizations, governmental a
10、nd 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 electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives
11、, 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 member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies ca
12、sting 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 identifying any or all such patent rights. ISO 8486-2 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC
13、5, Grinding wheels and abrasives. This second edition cancels and replaces the first edition (ISO 8486-2:1996), which has been technically revised. ISO 8486 consists of the following parts, under the general title Bonded abrasives Determination and designation of grain size distribution: Part 1: Mac
14、rogrits F4 to F220 Part 2: Microgrits F230 to F2000 BS ISO 8486-2:20071Bonded abrasives Determination and designation of grain size distribution Part 2: Microgrits F230 to F2000 1 Scope This part of ISO 8486 sets forth a method for determining or checking the size distribution of microgrits F230 to
15、F2000 in fused aluminium oxide and silicon carbide. It specifies 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 r
16、eferences The following referenced documents are indispensable 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 Determinat
17、ion and designation of grain size distribution Part 1: Macrogrits 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
18、grain sizes (ds50) of 60 m or less 4 Method of checking grain 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 permissib
19、le ds3value at the 3 % point of the grain size distribution curve; 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; BS ISO 8486-2:20072 c) the grain size (theoretical grain diameter) shal
20、l 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 US sedimentation tube (95 %). The testing of microg
21、rits 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 ds50value m ds80value min. m ds94value min. m F230 82
22、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 BS ISO 8486-2:20073Table 2 Grain size distribution of microgrits F230 t
23、o 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 26,7 1,5 14 F400 39 21,4 1 10 F500 34 17,1 1 7 F600 30 13,
24、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 m and ending at 1,2 m, as determined by a photosediment
25、ometer. 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 ratio of the median grain sizes F230 and F240 is 402 f , i.e
26、. 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, 3, 4, 5, 6, 7, 8, 9, 10, 11 and where the following equ
27、ation 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. BS ISO 8486-2:20074 Table 3 Calculation of the f nfactors (photosedimentation) Grit designation Median grain size m Formula F230 53 Starting
28、 point F240 44,5 0453 1144,52f = F280 36,5 1444,5 136,52f = F320 29,5 2436,5 129,52f = 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 = F1200 3 944,5 132f = F1500 2 1043122f = F2000 1,2 114211,
29、22f = BS ISO 8486-2:200755 Testing microgrits F230 to F2000 5.1 General Microgrits F230 to F2000 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 t
30、heoretical grain size at the 50 % point of the grain size distribution curve (ds50value), and 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 f
31、or the variations due to the measuring technique (sampling, sample preparation, different operators 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
32、 TC 29/SC 5. The tolerances given in Tables 1 or 2 are to be increased by these values. Table 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 microme
33、tres Permissible deviations for values Grit designation ds3ds50ds80ds94F230 F240 + 3,5 2,5 1,5 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 BS ISO 8486-2:20076 Table 5 Permissible deviations resulting from the variat
34、ions due to the measuring technique US sedimentation tube method Dimensions in micrometres 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
35、method The designation of the method for testing microgrits F230 to F2000 shall include an 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 e
36、xamples of suitable products available commercially. This information is given for the convenience of users of this part of ISO 8486 and does not constitute an endorsement by ISO of these products. BS ISO 8486-2:200776 Test methods 6.1 Test method based on Micro-F-Mastergrits Each of the Micro-F-Mas
37、tergrits 2)(hereafter referred to as “mastergrit”)used in testing is accompanied by 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 s
38、hall be corrected on the basis of the mastergrit values. The determination of grain 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 proc
39、edure The test shall be carried out in accordance with the instructions for the measuring 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
40、 by the mastergrit with that determined by the testing laboratory on its own instruments. 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, a
41、nd calculate the difference between this value and the corresponding value shown on 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 va
42、lues in Table 1. EXAMPLE SiC F240, for the ds50value: Mastergrit (MG): MG - ds50value 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 tol
43、erances of the ds50value for grit F240. 2) Micro-F-Mastergrits, of fused aluminium 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
44、 and does not constitute an endorsement by ISO of the product named. Equivalent products may be used if they can be shown to lead to the same results. BS ISO 8486-2:20078 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,
45、ds80or ds94/95are within the permissible limits given in Table 1 or 2. When 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
46、.1.4.1 X-ray gravitational technique 6.1.4.1.1 General The X-ray gravitational 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
47、 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
48、 0,1 m to about 300 m. The method is typically used for materials containing particles of approximately the same chemical composition which produce adequate X-ray opacity. 6.1.4.1.2 Underlying theory The method is based on two physical phenomena: low energy X-ray absorption and gravitational sedimentation, where Stokes law describes the gravitational sedimentation of a particle as a function of particle diameter. These two phenomena allow both the particle diameter and the corresponding mass of all particles of that size to be determined. a) Par
