1、BRITISH STANDARD BS ISO 6344-2:1998 Coated abrasives Grain size analysis Part 2: Determination of grain size distribution of macrogrits P12 to P220 ICS 25.100.70BSISO6344-2:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe auth
2、ority of the Standards Board and comes intoeffect on 15August1998 BSI 05-1999 ISBN 0 580 30264 4 National foreword This British Standard reproduces verbatim ISO6344-2:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MTE/
3、13, Grinding wheels, abrasive tools, paper and cloths, and powders, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; mon
4、itor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this doc
5、ument may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of
6、British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages1 to8
7、and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO6344-2:1998 BSI 05-1999 i Contents Page National for
8、eword Inside front cover Foreword iii Text of ISO 6344-2 1ii blankBSISO6344-2:1998 ii BSI 05-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Grain size distribution testing 1 5 Testing of macrogrits P12 to P220 3 6 Designation 4 7 Marking 4 8 Form for recording t
9、he results sieving analysis of P macrogrits 6 Annex A (informative) Example of presentation of test data for macrogrit P grain size distribution 7 Annex B (informative) Bibliography 8 Table 1 2 Table 2 Grain size distribution of macrogrits P12 to P220 5BSISO6344-2:1998 BSI 05-1999 iii Foreword ISO (
10、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 commi
11、ttee 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 electrotec
12、hnical standardization. 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 least75% of the member bodies casting a vote. International Standard ISO6344-2 was prepared by Te
13、chnical Committee ISO/TC29, Small tools, subcommittee SC5, Grinding wheels and abrasives. ISO6344 consists of the following parts, under the general title Coated abrasifs Grain size analysis: Part 1: Grain size distribution test; Part 2: Determination of grain size distribution of macrogrits P12 to
14、P220; Part 3: Determination of grain size distribution of microgrits P240 to P2500. Annex A andAnnex B of this part of ISO6344 are for information only. Descriptors: Tools, abrasives, grain size analysis, tests, determination, size classification, designation, marking.iv blankBSISO6344-2:1998 BSI 05
15、-1999 1 1 Scope This part of ISO6344 sets forth a method for determining or testing the grain size distribution of electro-fused aluminium oxide and silicon carbide macrogrits P 12 to P 220 for coated abrasives as defined in ISO6344-1. It applies both to those grits used in the manufacture of coated
16、 abrasive products and to those grits removed from products for testing purposes. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO6344. At the time of publication, the editions indicated were valid. All
17、 standards are subject to revision, and parties to agreements based on this part of ISO6344 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3
18、310-1:, Test sieves Technical requirements and testing Part1: Test sieves of metal wire cloth 1) . ISO 6344-1:1997, Coated abrasives Grain size analysis Part1: Grain size distribution test. ISO 9138:1993, Abrasive grains Sampling and splitting. ISO 9284:1992, Abrasive grains Test-sieving machines. 3
19、 Definitions For the purposes of this part of ISO6344 the definitions given in ISO6344-1 apply. 4 Grain size distribution testing 4.1 Apparatus 4.1.1 Test sieving machine The test shall only be carried out with test sieving machines giving reproducible and comparable results, e.g.RO-TAP test sieving
20、 machines in accordance with ISO9284. 4.1.2 Time switch A time switch shall be used to control the test sieving machine for a period of5min. The permissible accuracy shall be 5s. 4.1.3 Utility test sieves The utility test sieves given inTable 1 shall be used. They represent a selection of the test s
21、ieves according to ISO3310-1. The checking of the serviceability of the test sieves is described inclause5. 4.1.4 Balance Only balances with an accuracy of 0,1g shall be used. 1) To be published. (Revision of ISO3310-1:1990)BSISO6344-2:1998 2 BSI 05-1999 4.2 Mastergrits The mastergrits (MG) 2)repres
22、ent the reference for the grain size testing for coated abrasive products. The grain size distribution of the mastergrits is given inTable 2 (the limits specified in Table1 of ISO6344-1 are reproduced asTable 2 in this part of ISO6344), with the reservation that the tolerances for Q 3and Q 4are only
23、 half the indicated value on the test sieving machine of MPA Darmstadt. Each supply of mastergrits shall be accompanied by a test certificate of MPA Darmstadt indicating the sieving analysis and the respective date of test of the mastergrits. Table 1 4.3 Checking of the common use utility test sieve
24、s Common use utility test sieves must be free from visible defects such as textural flaws. (gaps, broken wiresetc.), insufficient tension of the fabric, distortions of the frame (out of roundness, leaks and solderingdefects) and free from blinding as these will impair the sieving results. Mastergrit
25、s shall be used for checking the serviceability of these test sieves within the meaning of this standard. 2) Mastergrits can be obtained by Staatliche Materialprfungsanstalt Darmstadt, Grafenstrae2, D-64283 Darmstadt. This information is given for the convenience of users of this part of ISO6344 and
26、 does not constitute an endorsement by ISO of the product named. Equivalent products may be used if they can be shown to lead to same results. Nominal sizes of openings of test sieves mm 4m 3,35 2,36 2 1,7 1,4 1,18 1 850 710 600 500 425 355 300 250 212 180 150 125 106 90 75 63 53BSISO6344-2:1998 BSI
27、 05-1999 3 The utility test sieve to be tested shall be mounted into the respective nest of sieves as the3rd sieve. The1st sieve and the2nd sieve must be checked sieves. The sum of the residues on the1st,2nd and 3rd sieve each shall not deviate from the mastergrit analysis value as given by MPA Darm
28、stadt by more than1,5 times the tolerance according to Table 2. Sieves which cannot be inserted as3rd sieve when assembled in the nest of test sieves according to Table 2, shall be tested as4th sieve. In this case it shall be ensured that the1st,2nd and3rd sieves are checked sieves. The sum of the r
29、esidues on test sieves1,2,3 and4 each must be within1,5 times the tolerance according toTable 2 for the mastergrit analysis value given by MPA Darmstadt. After this test, a sieve is considered as not suitable if the sum of the residues on the1st,2nd, and3rd or on the1st,2nd,3rd and4th sieve respecti
30、vely exceeds the permissible deviations ofTable 2 by more than half the value. The sum of the residues of the mastergrit on the1st,2nd and3rd sieve or on the1st,2nd,3rd and4th sieve as determined by MPA Darmstadt is applicable as the reference value. The sieves marked with3,35mm,2,36mm and534m shall
31、 be tested according to ISO3310-1. 5 Testing of macrogrits P12 to P220 5.1 Preparation 5.1.1 Preparation of the sample The abrasive grit to be tested must be dry. If it is wet, it must be dried at a temperature of105 C until its weight remains constant. 100g of the dry abrasive shall be weighed out
32、as sample for test sieving. In the case of grains recovered from the coated abrasive product, the sample shall never be less than20g. For sampling and splitting of abrasive grains, see ISO9138. 5.1.2 Mounting of test sieves The five utility test sieves, seeTable 2, required for testing the respectiv
33、e grain size shall be assembled together with the bottom pan to form a nest of sieves taking into account the prescribed order. The sample shall be poured onto the first test sieve and the cover put on. Then the nest of sieves shall be mounted in the test sieving machine. The tapper shall be placed
34、on the cover of the nest of test sieves. 5.1.3 Determination of the mastergrit values for the utility test sieving Because of the unavoidable deviations between test sieves of the same designation, it is necessary to carry out a first sieving with mastergrits on the sieves to be used in order to det
35、ermine the Q values of the mastergrit (MG values), thus checking the test sieves, and to obtain the corrected values for these sieves. For this purpose,100g of mastergrit of the same grain size shall be weighed out and transferred to test sieve1. The test sieving machine shall be run for5min by sett
36、ing the time switch accordingly. After the sieving is completed, the residues on the sieves shall be transferred cumulatively to the balance pan and weighed, beginning with the residue on the coarsest test sieve. The residues on the finer test sieves are added to the residue on the coarser test siev
37、es. The residue on the bottom pan shall also be weighed. The determined residues Q 1to Q 5are the MG values of the nest of utility test sieves used for the same grain size. 5.2 Test sieving procedure 100g of the abrasive grain to be tested shall be weighed out as sample and transferred to test sieve
38、1. The sieving procedure shall be the same as described for the mastergrit. If grains recovered from the coated abrasive product are to be tested, the quantity of the sample shall be not less than20 g. The sieving result shows the grain size distribution of the sample.BSISO6344-2:1998 4 BSI 05-1999
39、5.3 Evaluation Sieving results for mastergrit and the sample can best be compared using a typical form as shown below: If the results in column6 are within the permissible tolerance limits given in column7, then the sample is in compliance with the standard. If the values in column6 are not within t
40、he permissible tolerance limits, a second sample shall be taken and a new sieving carried out. 6 Designation The designation of macrogrits for fused aluminium oxide or silicon carbide in accordance with the requirements of this part of ISO6344 shall comprise a) the type of abrasive; b) the designati
41、on of the grit including the letter “P” for a coated abrasive followed by a characteristic number representing the grit size. EXAMPLE: 7 Marking When packing grits of fused aluminium oxide and silicon carbide for coated abrasive products, the grit designation, i.e.P80, shall be marked on each of the
42、 smallest packing units. Column 1: Sieve designation according to aperture sizes as given inTable 2. Column 2: Sieving analysis of the mastergrit as given by the certificate of MPA Darmstadt. Column 3: Sieving analysis of the mastergrit determined on the nest of utility test sieves. Column 4: Differ
43、ence between the sieving analysis of the mastergrit in Column3 and the sieving analysis of the mastergrit by MPA Darmstadt in column2. Attention shall be paid to the signs! Column 5: Sieving analysis of the sample determined on the same nest of test sieves. Column 6: Corrected sieving analysis of th
44、e sample, determined from the difference between column5 and column4. Attention shall be paid to the signs! Column 7: Permissible limiting values according toTable 2.BSISO6344-2:1998 BSI 05-1999 5 Table 2 Grain size distribution of macrogrits P12 to P220 Grit designation Test sieve 1 Test sieve 2 Te
45、st sieve 3 Test sieve 4 Test sieve 5 Remainder in bottom pan Residue on test sieve 1 Residue on test sieves 1 and 2 Aperture size sieve 3 Residue on test sieves 1, 2 and 3 Residue on test sieves 1, 2, 3 and 4 Residue on test sieves 1, 2, 3, 4 and 5 Aperture size sieve 1 Aperture size sieve 2 Apertur
46、e size sieve 4 Aperture size sieve 5 w 1 Q 1 w 2 Q 2 max. w 3 Q 3 w 4 Q 4 w 5 Q 5 min. %Q max. mm 4m % mm 4m % mm 4m % mm 4m % mm 4m % % P12 3,35 0 2,36 1 2 14 4 1,7 61 9 1,4 92 8 P16 2,36 0 1,7 3 1,4 26 6 1,18 75 9 1 96 4 P20 1,7 0 1,18 7 1 42 8 850 86 6 710 96 4 P24 1,4 0 1 1 850 14 4 710 61 9 600
47、 92 8 P30 1,18 0 850 1 710 14 4 600 61 9 500 92 8 P36 1 0 710 1 600 14 4 500 61 9 425 92 8 P40 710 0 500 7 425 42 8 355 86 6 300 96 4 P50 600 0 425 3 355 26 6 300 75 9 250 96 4 P60 500 0 355 1 300 14 4 250 61 9 212 92 8 P80 355 0 250 3 212 26 6 180 75 9 150 96 4 P100 300 0 212 1 180 14 4 150 61 9 12
48、5 92 8 P120 212 0 150 7 125 42 8 106 86 6 90 96 4 P150 180 0 125 3 106 26 6 90 75 9 75 96 4 P180 150 0 106 2 90 15 5 75 62 12 63 90 10 P220 125 0 90 2 75 15 5 63 62 12 53 90 10BSISO6344-2:1998 6 BSI 05-1999 8 Form for recording the results of sieving analysis of P macrogrits Testing of P12 to P220 m
49、acrogrits Abrasive: Supplier: Girt designation: . Date of delivery: Test sieving machine: Quantity of sample: . Test sieve Sieve designation Sieving analysis of the mastergrit Difference Sieving analysis of the sample on set of utility test sieves Corrected sieving analysis of the sample Permissible limiting values according toT
