1、BRITISH STANDARD BS 4581-2: 1984 Flanges for mounting grinding wheels on grinding machine tools Part 2: Specification for dimensions and materials of flanges for grinding wheels of less than76.2mm bore UDC 62-229.2:621.922.025BS4581-2:1984 This British Standard, having been prepared under the direct
2、ionof the Mechanical Engineering Standards Committee, was published underthe authority of theBoardofBSI and comesintoeffecton 30March1984 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference MEE/6 Draft for comment82/75125 DC ISBN 0 580 13467 9 Committees
3、 responsible for this British Standard The preparation of this British Standard was entrusted by the Mechanical Engineering Standards Committee (MEE/-) to Technical Committee MEE/6 upon which the following bodies were represented: Ball and Roller Bearing Manufacturers Association Control and Automat
4、ion Manufacturers Association (BEAMA) Department of Industry (Mechanical Engineering) Federation of British Engineers Tool Manufacturers Health and Safety Executive Institution of Production Engineers Machine Tool Industry Research Association Ministry of Defence University of Aston in Birmingham Un
5、iversity of Manchester Institute of Science and Technology Amendments issued since publication Amd. No. Date of issue CommentsBS4581-2:1984 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 Dimensions 2 5 Materials 2 6 Fl
6、ange assembly 2 7 Bore inserts 2 Appendix A Criteria for grinding wheels not selected from BS4481-2 8 Figure 1 Type 1 fixed flange and loose flange assembly showing grinding wheel mounted 3 Figure 2 Type 2 fixed flange and loose flange assembly showing grinding wheel mounted 4 Figure 3 Type 3 fixed
7、flange and loose flange assembly showing grinding wheel mounted 5 Figure 4 Type 4 fixed flange and loose flange assembly showing grinding wheel mounted 5 Table 1 Grinding wheels selected from BS4481-2 1 Table 2 Dimensions of flanges of types 1, 2, 3 and 4 6 Publications referred to Inside back cover
8、BS4581-2:1984 ii BSI 01-2000 Foreword This Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and is based on a draft prepared by the Machine Tool Industry Research Association. The dimensions in this standard take into account the r
9、esults of tests carried out by MTIRA on steel straight recessed flanges to determine the pressure distribution across the gripping area of the flange. Results obtained with flanges manufactured to“worst-case” dimensions have been similar to the pressure distributions for flanges specified in BS4581-
10、1 and ISO666:1975 “Machine tools Mounting of plain grinding wheels by means of hub flanges”, the latter standard having been published by the International Organization for Standardization (ISO). This standard defines the leading dimensions of flange geometry that are considered consistent with a sa
11、tisfactory pressure distribution over the clamping annulus (gripping face of a flange). It cannot be too strongly emphasized that this specification gives certain principal dimensions only. The safe use of grinding wheels depends not only on the correct application of these dimensions in the design
12、and manufacture of machines and of grinding wheels, but also to a very great extent on their proper assembly and use. Attention is drawn to The Abrasive Wheels Regulations (Statutory Instrument1970 Number 535) published by HMSO. Further advice on the relevant statutory requirements may be obtained f
13、rom the Health and Safety Executive. Flanges for mounting grinding wheels of76.2mm bore or over are specified in BS4581-1. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance w
14、ith 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, pages1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had am
15、endments incorporated. This will be indicated in the amendment table on the inside front cover.BS4581-2:1984 BSI 01-2000 1 1 Scope This Part of BS4581 specifies the principal dimensions of flanges for mounting grinding wheels of less than76.2mm bore on grinding machine tools. The flanges are primari
16、ly intended for use with grinding wheels selected from BS4481-2 as listed inTable 1 but criteria for the use of other grinding wheels are given inAppendix A. Requirements for materials are also specified. The flanges are intended for use with plain wheels for external cylindrical grinding, plain whe
17、els for surface grinding, grinding wheels for tool and cutter grinding, including plain wheels, straight cup wheels, taper cup wheels and dish wheels, and grinding wheels for cutting off. This Part of this standard is not applicable to the mounting of wheels on hand-held machines nor to the mounting
18、 of wheels on bench grinders. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the following definitions apply. 2.1 machine tool a power-driven machine, not portable by hand while in operatio
19、n, which works metal by cutting, forming, physico/chemical processing, or a combination of these techniques NOTEThis definition is taken from BS4640. 2.2 fixed flange a flange that is secured to the spindle or hub in service in such a way that it need not be removed from the hub for purposes of chan
20、ging the grinding wheel (seeFigure 1 toFigure 4) NOTEA fixed flange, if a separate item, may be secured to the spindle by means of a key, interference fit, taper or thread, or a combination of these, depending on the design of the flange assembly. Alternatively, the fixed flange may be integral with
21、 a hub. 2.3 loose flange a flange that is removable from the hub or spindle for purposes of changing the grinding wheel (seeFigure 1 toFigure 4) 3 Classification 3.1 type 1 assembly. An assembly consisting of a loose flange having a plain bore and a fixed flange, usually manufactured separately from
22、, but fixed to and positively driven by the grinding machine spindle (seeFigure 1). 3.2 type 2 assembly. An assembly consisting of a loose flange having a threaded bore, a keyed washer and a fixed flange which is integral with a hub. The hub is threaded externally to accept the loose flange. The hub
23、 permits the whole assembly to be mounted on a grinding machine spindle (seeFigure 2). 3.3 type 3 assembly. An assembly consisting of a loose flange having a plain bore and a fixed flange, which is integral with a hub (seeFigure 3). 3.4 type 4 assembly. An assembly consisting of a loose flange havin
24、g a threaded bore, a keyed washer and a fixed flange, usually manufactured separately from, but fixed to and positively driven by the grinding machine spindle. The spindle is threaded externally to accept the loose flange (seeFigure 4). Table 1 Grinding wheels selected from BS4481-2 Designation of g
25、rinding wheel in BS4481-2 Limitation where applicable Table number (BS4481-2:1983) Wheel type Description 3 1 Grinding wheels for cutting off, withoutreinforcement Wheel diameters not exceeding200mm 4(d) 5 Grinding wheels with one recess Wheel diameters not exceeding200mm 5(a) 1 Plain grinding wheel
26、s Wheel diameters not exceeding200mm 8(a) 1 Plain wheels 8(b) 6 Straight cup wheels 8(c) 11 Taper cup wheels 8(d) 12 Dish wheelsBS4581-2:1984 2 BSI 01-2000 4 Dimensions Dimensions of fixed flanges, loose flanges, keyed washers and spacers shall be as given inTable 2. NOTEWhen additional features suc
27、h as tommy bar holes are incorporated, which represent a non-uniform cross section and which create a non-uniform circumferential pressure distribution, minimum dimensions l 1and l 4will need to be increased so as to counteract this condition. 5 Materials 5.1 Flanges and keyed washers. The material
28、used for flanges and keyed washers shall be steel and shall have the following minimum mechanical properties: NOTESteel070M20 of BS970-1 in a normalized condition is considered suitable for these purposes. 5.2 Spacers. The material used for spacers shall have the following minimum mechanical propert
29、ies: NOTESteel220M07 of BS970-1 in either the hot rolled or cold drawn condition is considered suitable for this purpose. 6 Flange assembly 6.1 Types 1 and 4. The fixed flange shall be attached to the spindle so as to prevent any relative rotational or axial movement between these two parts. 6.2 Typ
30、es 2 and 4 6.2.1 The loose flange shall clamp the grinding wheel and blotters through a keyed washer. 6.2.2 The bore of the keyed washer shall incorporate at least one key, or tab, which locates in a keyway in the externally threaded hub of the fixed flange. 6.2.3 The key(s) or the tab(s) shall ensu
31、re that the abrasive wheel and blotter are held by the flanges when the spindle is loaded, or rotates, in either direction. They shall also ensure that the blotters are not damaged while the wheel is being clamped by rotating the loose flange along the thread of the hub. NOTE 1The purpose of the key
32、 is to resist the applied torque, to ensure that the wheel and blotters experience a predominantly compressive load. NOTE 2These types of assembly, where the bore of the loose flange is threaded, should only be used in cases where a short overall length of front protrusion is necessary, e.g.when usi
33、ng cupped wheels. 6.3 Wheels having a clamping thickness of less than6mm. For type2 and type4 assemblies, when mounting wheels having a clamping thickness of less than6mm, a spacer with two radial gripping widths equal to that of the loose flange shall be fitted between the blotter and the keyed was
34、her seeFigure 2b) andFigure 2c). 7 Bore inserts Where bore inserts (loose bushes) are used to locate the wheel radially, no part of the bore insert shall be clamped by the flanges or spacers. NOTE 1Many bore inserts incorporate a thin flange for axial location within the abrasive bore. It is importa
35、nt that this thin flange is not overlapped by the blotter where this may cause the recessed face of the mounting flange or spacer or the face of the keyed washer to clamp through the thin flange onto the corner of the abrasive near the bore. NOTE 2The thickness of the blotter should always exceed th
36、e thickness of the thin flange on the bore insert. tensile strength 430N/mm 2 yield stress 215N/mm 2 elongation 21% on5.65S o hardness HB 126 to179 tensile strength 350N/mm 2 yield stress 215N/mm 2 elongation 8% minimum on5.65S oBS4581-2:1984 BSI 01-2000 3 Figure 1 Type 1 fixed flange and loose flan
37、ge assembly showing grinding wheel mountedBS4581-2:1984 4 BSI 01-2000 NOTE 1b 1is the clamping thickness of the grinding wheel. It is shown for reference purposes only and is not dimensioned. NOTE 2Q 1is the nominal length of the hub. It is not specified as it is a function of the wheel width and th
38、e shaft or spindle end. NOTE 3 d 4is not specified. It may be equal to or less than d 2 , the bore/spigot diameter. All dimensions are in millimetres. Figure 2 Type 2 fixed flange and loose flange assembly showing grinding wheel mountedBS4581-2:1984 BSI 01-2000 5 Figure 3 Type 3 fixed flange and loo
39、se flange assembly showing grinding wheel mounted Figure 4 Type 4 fixed flange and loose flange assembly showing grinding wheel mountedBS4581-2:1984 6 BSI 01-2000 Table 2 Dimensions of flanges of types 1, 2, 3 and 4 (seeFigure 1 toFigure 4) Grinding wheels Flanges D Unworn outside diameter d Bore di
40、ameter (see notes 1 and 3) Wheel type (BS4481-2:1983) Choice of bore of insert if provided (seenote 3) d 2 Bore/ spigot diameter (see notes 2 and 3) d 3 Outside diameter l 1 Thickness at bore l 2 Recess depth l 3 Radial width of gripping face l 4 Thickness at edge of recess b Max. table number type
41、number Tolerance: plain bore H8 aspigot f7 a Max. Min. Min. Max. Min. Max. Min. Min. mm mm mm mm mm mm mm mm mm mm mm mm 50 (12.7) 13 8(b) type 6 8(c) type 11 (12.7) 13 21 20 3.5 1 1 3 3 2 80 (12.7) 13 8(a) type 1 8(b) type 6 8(c) type 11 8(d) type 12 (12.7) 13 30 27 5 2 0.5 5 3 2.5 100 (12.7) 3type
42、 1 8(a) type 1 8(c) type 11 8(d) type 12 (12.7) 13 8(a) type 1 13 (19.05) 20 3type 1 (19.05) 20 (19.05) 8(a) type 1 8(b) type 6 8(c) type 11 8(d) type 12 12.7 (19.05) 35 34 5 2 0.5 4 3 3 (20) 8(a) type 1 or 13 (20) 20 8(b) type 6 8(c) type 11 8(d) type 12 20 (31.75) 8(a) type 1 8(b) type 6 8(c) type
43、 11 12.7, 13, 19.05 or 20 (31.75) 55 50 5 2 0.5 6 3 3 125 (12.7) 8(a) type 1 (12.7) 60 42 8 2 0.5 8 5 5 (31.75) 8(a) type 1 8(b) type 6 12.7, 13 (31.75) 88 54 6 2 0.5 8 5 5 32 8(c) type 11 19.05, or 20 32 80 8 8(d) type 12 60 150 (12.7) 3type 1 8(a) type 1 (12.7) 64 50 8 2 0.5 11 6 5 (19.05) 20 3typ
44、e 1 (19.05) 20 (31.75) 32 3type 1 5(a) type 1 8(a) type 1 8(b) type 6 8(c) type 11 12.7, 13, 19.05 or 20 (31.75) 32 88 60 6 2 0.5 11 6 5 8(d) type 12 64 8 (50.8) 8(b) type 6 12.7, 13, 19.05, 20 31.75 or 32 (50.8) 70 69 8 2 0.5 6.5 6 5 a See BS4500-1. b SeeFigure 2 for relationship with balance weigh
45、t groove when provided.BS4581-2:1984 BSI 01-2000 7 Table 2 Dimensions of flanges of types 1, 2, 3 and 4 (seeFigure 1 toFigure 4) Grinding wheels Flanges D Unworn outside diameter d Bore diameter (see notes 1 and 3) Wheel type (BS4481-2:1983) Choice of bore of insert if provided (seenote 3) d 2 Bore/
46、spigot diameter (see notes 2 and 3) d 3 Outside diameter l 1 Thickness at bore l 2 Recess depth l 3 Radial width of gripping face l 4 Thickness at edge of recess b Max. table number type number Tolerance: plain bore H8 aspigot f7 a Max. Min. Min. Max. Min. Max. Min. Min. mm mm mm mm mm mm mm mm mm m
47、m mm mm 180 (12.7) 3type 1 8(a) type 1 (12.7) (19.05) 20 (31.75) 3type 1 (19.05) 20 (31.75) (31.75) 32 4(d) type 5 5(a) type 1 8(a) type 1 12.7, 13, 19.05 or 20 (31.75) 32 100 60 6 2 0.5 11 6 5 200 (15.88) 16 4(d) type 5 (15.88) 16 (19.05) 20 (31.75) 3type 1 (19.05) 20 (31.75) (31.75) 32 4(d) type 5
48、 5(a) type 1 8(a) type 1 12.7, 13, 19.05 or 20 (31.75) 32 100 67 8 2 0.5 13 6 5 (50.8) 5(a) type 1 12.7, 13, 19.05, 20, 31.75 or 32 (50.8) 100 79 6 2 0.5 11 6 5 70 69 8 2 0.5 6.5 6 5 Notes toTable 2 NOTE 1Values of d in brackets indicate transitional dimensions. Wherever possible, hole diameters sho
49、uld be chosen from the dimensions of d which are not shown in brackets. It is recognized however that there will be a transitional period where there is still a demand for the dimensions in brackets. NOTE 2Loose flanges with plain bores are intended to be a sliding fit on the spindle. The tolerance on the spindle is outside the scope of this standard but a tolerance of f7 (see BS4500-1) would achieve the desired fit. NOTE 3Bore inserts are used in cases where a matching spindle or spigot diameter to suit the whe
