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1、BRITISH STANDARD BS 5851:1980 ISO 6106:1979 Specification for Grain sizes of diamond or cubic boron nitride ISO title: Abrasive products Grain sizes of diamond or cubic boron nitride UDC 621.921:679.89:620.168.36 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontr
2、olled Copy, (c) BSI BS 5851:1980 This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 January 1980 BSI 12-1999 The following BSI references relate to the
3、 work on this standard: Committee reference MEE/86 Draft for comment 78/72340 DC ISBN 0 580 11161 X Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department
4、s and scientific and industrial organizations: Associated Offices Technical CommitteeDepartment of Trade (Marine Division) Association of Consulting EngineersDepartment of Transport Association of Hydraulic Equipment Electricity Supply Industry in England and ManufacturersWales Association of Mining
5、 Electrical and Engineering Equipment Users Association Mechanical EngineersFederation of Manufacturers of Construction British Compressed Air SocietyEquipment and Cranes British Electrical and Allied Manufacturers Health and Safety Executive Association (BEAMA)Institution of Gas Engineers British G
6、as CorporationInstitution of Mechanical Engineers British Gear Manufacturers AssociationInstitution of Plant Engineers British Internal Combustion Engine Institution of Production Engineers* Manufacturers AssociationLloyds Register of Shipping British Pump Manufacturers AssociationLondon Transport E
7、xecutive British Steel CorporationMachine Tool Industry Research British Steel IndustryAssociation* British Valve ManufacturersMinistry of Defence Association Ltd.National Coal Board Chartered Institution of Building ServicesOil Companies Materials Association Crown Agents for Oversea Governments an
8、d Process Plant Association AdministrationsSociety of Motor Manufacturers and Department of Industry (Mechanical Traders Limited Engineering)Telecommunication Engineering and Department of Industry (National Manufacturing Association (TEMA) Engineering Laboratory)Water-tube Boilermakers Association
9、Department of the Environment (PSA) The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Diamond Die FederationDiamond Industrial Products Association Brit
10、ish Ophthalmic Lens Manufacturers Federation of British Engineers Tool AssociationManufacturers Diamond Bonded Products AssociationFederation of Manufacturing Opticians Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 G
11、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 BSI 12-1999i Contents Page Cooperating organizationsInside front cover National forewordii 1Scope and field of application1 2References1 3Equipment1 4Procedure1 5Evaluation of the results2 6Designation and grading limits2 Annex A Special adaptor
12、s for 75 mm (3 in) sieves5 Annex B Choice of aperture sizes for electroformed test sieves5 Figure 1 Lid plate adaptor5 Figure 2 Bottom plate adaptor5 Table 1 Aperture sizes of electroformed sieves1 Table 2 Particle size distribution from wire sieves3 Table 3 Particle size distribution from electrofo
13、rmed sieves4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Mechanical Engineering St
14、andards Committee. It is identical with ISO 6106 “Abrasive products Grain sizes of diamond or cubic boron nitride” prepared by ISO/TC 29, Small tools, of the International Organization for Standardization (ISO), and forms part of a series being developed by ISO/TC 29 dealing with abrasive products.
15、Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following
16、. The comma has been used as a decimal marker for metric units. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Cross-refe
17、rences. There are no British Standard equivalents for ISO 565, ISO 2591 or ISO 3310-1. Related British Standards for ISO 565, ISO 2591 and ISO 3310-1 are BS 410, BS 1796 and BS 410 respectively. A British Standard does not purport to include all the necessary provisions of a contract. Users of Briti
18、sh 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, pages 1 to 6, an inside back cover and a back cover
19、. 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. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 BSI 12-1999
20、1 1 Scope and field of application This International Standard establishes a method for checking the grain size of diamond or cubic boron nitride as used for the manufacture of industrial products such as grinding wheels, saws, etc. It applies to grains of particle sizes between 41 and 1 180 4m. It
21、gives the grit size designation, the size limits, the sieves to be used in determining them and the procedure to be adopted for checking the size of the grain exclusive of any metal coating. NOTEFor simplification, reference is made throughout this International Standard to “diamond” grains, but all
22、 indications also apply to cubic boron nitride. 2 References ISO 565, Test sieves Woven metal wire cloth and perforated plate Nominal sizes of apertures. ISO 2591, Test sieving. ISO 3310-1, Test sieves Technical requirements and testing Part 1: Metal wire cloth. 3 Equipment 3.1 Sieving machine The m
23、achine to be used shall have a rotational frequency of approximately 290 min1 and shall give 156 vertical taps per minute. The nest of sieves shall be free to rotate under these combined forces. The sieving machine shall be equipped with a plate on which the sieves rest. The lid shall be equipped wi
24、th a cork plug. The drop distance between the cork plug and the tapper shall be 38 6 mm (1.5 0.25 in). 3.2 Test sieves 3.2.1 Coarse group (1 180 to 425 m) The test sieves to be used shall be sieves with woven metal wire cloths as sieving media and a round frame of 200 mm (8 in) diameter and 25 mm (1
25、 in) depth. These sieves shall conform to the requirements of ISO 2591 and ISO 3310-1. A receiver (pan) and a lid (cover) are necessary. NOTEThe sieves used for measurement of sizing shall be calibrated in relation to one another. 3.2.2 Fine group (455 to 41 m) Electroformed sieves with 200 mm (8 in
26、) or 75 mm (3 in) diameter and 25 mm (1 in) depth frames of brass or stainless steel shall be used. A receiver and a lid are necessary. These electroformed sieves shall have a supporting grid of 2,2 lines per centimetre (5.6 wires per inch) bonded to the top surface of the sieve to prevent diamond g
27、rain sliding over the smooth top surface, which would considerably reduce sieving efficiency. The sieves shall have apertures of the sizes indicated in Table 1 (Annex B gives the reasons for choosing these apertures). Table 1 Aperture sizes of electroformed sieves 3.3 Sample splitter A sample splitt
28、er which will produce a sample representative of the material shall be used. 3.4 Balance A laboratory balance shall be used which has a precision of a least 0,01 g if using 200 mm sieves or at least 0,001 g if using 75 mm sieves. 3.5 Timer A timer with an accuracy of 15 s in 15 min shall be used. 4
29、Procedure 4.1 Atmospheric conditions The test shall be performed under the following conditions: relative humidity: 45 to 55 %; temperature: 20 to 25 C (68 to 77 F). Aperture sizea 4m Ruling linesAperture sizea 4m Ruling lines cm1in1cm1in1 455 384 360 16,4 18,7 20,3 41.7 47.6 51.6 139 127 116 46,3 4
30、9,2 49,2 117.6 125.0 125.0 322 302 271 21,9 24,6 26,2 55.6 62.5 66.6 107 97 90 59,1 65,6 65,6 150.0 166.6 166.6 255 227 213 26,2 30,3 30,3 66.6 76.9 76.9 85 75 65 71,6 78,7 78,7 181.8 200.0 200.0 197 181 165 151 35,8 35,8 39,4 43,7 90.9 90.9 100.0 111.1 57 49 41 87,5 98,4 98,4 222.2 250.0 250.0 a To
31、lerance on the aperture sizes: 3 4m for the aperture sizes W 139 2 4m for the aperture sizes u 127 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 2 BSI 12-1999 4.2 Sampling The material to be tested shall be blended and divided
32、 utilizing a sample splitter so as to obtain a representative sample. The resulting sample shall then be spread out on a stainless steel pan and allowed to acclimatize for 30 min at a relative humidity and temperature as specified in 4.1. The mass of sample, measured with the precision specified in
33、3.4, shall fall within the required range indicated in Table 2 and Table 3. 4.3 Preparation for sieving Assemble the desired nest of sieves in order of aperture size with the coarsest sieve on top and with a receiver on the bottom. Pour the test sample onto the top sieve and place a lid over the lat
34、ter. Place the entire unit in the machine. The sieve nest must be free to rotate during the sieving cycle, otherwise incomplete sieving and erratic results may occur. To facilitate rotation, maintain a clearance of 3 mm (0.125 in) between the sieve nest lid and head yoke of the machine, and ensure t
35、hat the receiver spring clip does not bind on the bottom receiver. With 75 mm (3 in) sieves, use a special adaptor (see Annex A). 4.4 Sieving procedure Set the timer controlling the sieving machine for 15 min and set the machine in operation. At the completion of the cycle remove the sieve nest from
36、 the machine. Beginning with the top sieve (coarsest), empty the oversize onto a clean piece of glossy paper by gently striking the frame. Fine group sieves shall not be brushed; the underside of coarse group sieves shall be brushed with a soft brass wire brush to remove particles embedded in the si
37、eve. Repeat this procedure with each subsequent sieve, taking care not to damage the sieves. Clean fine group sieves periodically by ultrasonic methods. 5 Evaluation of the results 5.1 Weighing the sieve fractions Oversize and undersize shall be weighed to the precision specified in 3.4. If the sum
38、of the masses of all the fractions, i.e. oversize plus undersize, is less than 99 % of the original mass, the above procedure shall be repeated on a new sample. 5.2 Calculation of results The oversize and undersize masses shall be expressed as percentages of the sum total of all the fraction masses.
39、 6 Designation and grading limits Table 2 and Table 3 give the grain designations and the limits for the particle size distribution of each grit. Two systems of designation are envisaged. 6.1 One, which is more particularly used in Europe, is based on sieve nominal aperture sizes according to ISO 56
40、5. The code number is made up of the sum of the aperture size, in micrometers, of the largest sieve used, and the number of intervals between the largest and smallest sieves used. 6.2 The other, which is more particularly used in the United States of America, is based on the US designation of sieves
41、 (it is the approximate number of openings per linear inch). The code number is made up of the numbers of the two sieves used, separated by a stroke, with the largest aperture sieve first. NOTECountries adopting this International Standard may add a letter (D, B or any other letter) before the code
42、number, in their national standards. At least 99,9 % of the diamond shall pass through the oversize-limiting sieve, in this case 227 4m. All the diamond may pass through the upper test sieve, in this case, the 165 4m sieve. Not more than 10 % shall be retained on it. It is permissible to have 100 %
43、undersize through the upper test sieve and 100 % oversize on the lower test sieve (127 4m), the requirement being that at least 87 % of the grains shall pass through the upper test sieve and shall remain on the lower test sieve. Not more than 10 % shall pass through the lower test sieve and not more
44、 than 2 % through the undersize-limiting sieve (90 4m). As a further clarification: If 100 % of the diamond claimed to be 151 passes through both the oversize-limiting and upper test sieves, and 88 % is retained on the lower test sieve, the diamond shall not be accepted because 12 % passing through
45、the lower test sieve exceeds the 10 % allowed for this grit size. Examples showing the use of Table 2 and Table 3 Consider a grain designated 151 (or 100/120) Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 BSI 12-19993 Table 2
46、Particle size distribution from wire sieves Grit designationSieve aperture size (according to ISO 565) Test sample for 200 mm sieve 99,9 % through sieve (oversize-limiting sieve) Upper test sieveLower test sieve 2 % through sieve (undersize-limiting sieve) 1st system (see 6.1) 2nd systema (see 6.2)
47、aperture size max. oversize aperture size min. oversize max. undersize 4mg4m4m%4m%4m Narrow range grades 1 181 1 001 851 711 601 501 16/18 18/20 1 180/1 000 1 000/850 850/710 710/600 600/500 500/425 80 to 120 80 to 120 80 to 120 80 to 120 80 to 120 80 to 120 1 700 1 400 1 180 1 000 850 710 1 180 1 0
48、00 850 710 600 500 8 8 8 8 8 8 1 000 850 710 600 500 425 90 90 90 90 90 90 8 8 8 8 8 8 710 600 500 425 355 300 Wide range grades 1 182 852 602 20/30 30/40 1 180/850 850/600 600/425 80 to 120 80 to 120 80 to 120 1 700 1 180 850 1 180 850 600 8 8 8 850 600 425 90 90 90 8 8 8 600 425 300 a Some grain s
49、izes are used in the first designation system and not in the second, hence the missing designations. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 14:20:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5851:1980 4 BSI 12-1999 Table 3 Particle size distribution from electroformed sieves Grit designationSieve aperture size (according to ISO 565) Test sample for sieves99,9 % through sieve (oversize-limiting sieve) Upper test sieveLower test sieve2 % through sieve (undersize-limiting sieve) 1st system