BS 4411-1969 Specification for woodcutting bandsaw blades《木材切割用带锯条规范》.pdf

1、BRITISH STANDARD BS 4411:1969 Specification for Woodcutting bandsaw bladesBS4411:1969 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee, was published under the authorityof the Executive Boardon 28 February 1969 BSI 12-1999 The following BSI referen

2、ces relate to the work on this standard: Committee reference MEE/171/2 Draft for comment 68/4952 ISBN 580 00481 3 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the follo

3、wing Government departments and scientific and industrial organizations: The Government departments and scientific and industrial 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 Br

4、itish Standard: Associated Offices Technical Committee Institution of Gas Engineers Association of Consulting Engineers Institution of Heating and Ventilating Association of Mining Electrical and Engineers Mechanical Engineers Institution of Mechanical Engineers Board of Trade Institution of Mechani

5、cal Engineers British Chemical Plant Manufacturers (Automobile Division) Association Institution of Production Engineers British Compressed Air Society Locomotive and Allied Manufacturers British Electrical and Allied Manufacturers Association of Great Britain Association London Transport Board Brit

6、ish Gear Manufacturers Association Machine Tool Trades Association* British Internal Combustion Engine Ministry of Defence Manufacturers Association Ministry of Defence, Army Department British Mechanical Engineering Confederation Ministry of Labour (H.M. Factory Inspectorate) British Pump Manufactu

7、rers Association Ministry of Power British Steel Industry* Ministry of Public Building and Works Crown Agents for Oversea Governments and Ministry of Technology Administrations Ministry of Technology, National Engineering Electricity Council, the Central Electricity Laboratory Generating Board and t

8、he Area Boards in Ministry of Transport England and Wales National Coal Board Engineering Equipment Users Association National Physical Laboratory (Ministry of Gas Council Technology) Institute of Marine Engineers Royal Institute of British Architects Institution of Civil Engineers Agricultural Engi

9、neers Association Home Timber Merchants Association of British Furniture Manufacturers Federated England and Wales Associations Ministry of Technology (F.P.R.L.) British Woodwork Manufacturers Association National Sawmilling Association Saw Manufacturers Association Amendments issued since publicati

10、on Amd. No. Date CommentsBS4411:1969 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Nomenclature and definitions 1 3 Classification of wide bandsaw blades 2 4 Material 2 5 General quality requirements 2 6 Set 2 7 Dimensions 3 8 Recommended blade spe

11、eds 3 Appendix A Imperial units 9 Figure 1 Narrow bandsaw tooth profile 4 Figure 2 Wide bandsaw tooth profile: spring set 5 Figure 3 Wide bandsaw tooth profile: swage set 6 Table 1 Recommended minimum set for both narrow and wide blades 7 Table 2 Standard widths and recommended thickness of narrow b

12、andsaw blades 7 Table 3 Recommended pitches for narrow bandsaw blades 8 Table 4 Recommended thickness of narrow blades for use on different wheel diameters 8 Table 5 Standard widths and recommended thickness of wide bandsaw blades 8 Table 6 Rake and clearance angles for wide bandsaws 8 Table 7 Recom

13、mended pitches and gullet angles for wide bandsaw blades 8 Table 8 Recommended maximum thickness of wide blades for use on different wheel diameters 8 Table 1A Recommended minimum set for both narrow and wide blades 9 Table 2A Standard widths and recommended thickness of narrow bandsaw blades 9 Tabl

14、e 3A Recommended pitches for narrow bandsaw blades 9 Table 4A Recommended thickness of narrow blades for use on different wheel diameters 9 Table 5A Standard widths and recommended thickness of wide bandsaw blades 9 Table 7A Recommended pitches and gullet angles for wide bandsaw blades 9 Table 8A Re

15、commended thickness of wide blades for use on different wheel diameters 9BS4411:1969 ii BSI 12-1999 Foreword This standard makes reference to the following British Standards: BS 427, Method for Vickers hardness test Part 1: Testing of metals. BS 1449, Steel plate, sheet and strip. This British Stand

16、ard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee, in an attempt to provide detailed information for both the users and the manufacturers of bandsaw blades. The standard relates to both narrow and wide bandsaw blades, and includes details of set, to

17、oth shape, blade dimensions, blade material and running speeds; a fairly comprehensive list of terms have been defined, in order to provide a vocabulary common to the users and the manufacturers. In the case of wide bandsaws, tooth shape has been related to the density of timber being cut (seeTable

18、6), as this was felt to be the most general classification method available. In this connection it should be noted that this standard specifically excludes bandsaws suitable for cutting synthetic material. Teeth tipped with hard metals and double cutting bandsaw blades have also been excluded, as it

19、 was felt that they should not be considered as a standard item. Attention is drawn to the fact that the cutting efficiency of bandsaw blades must depend to a large extent on the skill of the user in choosing the correct combination of tooth shape, blade width, thickness, pitch, machine wheel diamet

20、er, and speed, from those values shown in this standard. In case of doubt, the Forest Products Research Laboratory and/or manufacturers should be consulted. It should be noted that only blades made to inch dimensions are available at present, but it is expected that their metric equivalents will gra

21、dually be phased-in. It is for this reason that inch units have been included in this standard, but only in an appendix in order that their use is not encouraged. The values quoted are compatible to achieve the same degree of accuracy, but are not exact mathematical equivalents. A British Standard d

22、oes not purport to include all the necessary provisions of a contract. Users of 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 in

23、side front cover, pages i and ii, pages1 to 9 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.BS4411:1969 BSI 12-1999 1 1 Scope This British Standard relates to the

24、 terminology, manufacture, properties, dimensions and tolerances of both “narrow” and “wide” bandsaw blades; either supplied in coil, or cut to length and joined ready for use. The blades specified in this standard, which does not include saws tipped with hard metals, are suitable for cutting timber

25、 in its naturally occurring form, but not its manufactured derivatives (i.e.plywood, blockboard, or any synthetic material). 2 Nomenclature and definitions For the purposes of this British Standard the following definitions apply. 2.1 General 2.1.1 narrow bandsaw blade a bandsaw blade which has a wi

26、dth not exceeding65mm (2“ in), and normally runs on a wheel covered by a tyre made of resilient material 2.1.2 wide bandsaw blade a bandsaw blade which has a width greater than, or equal to80mm (3in), and normally runs direct on the metal base of the wheel, and is processed to ensure correct trackin

27、g of the band on the wheel 2.1.3 minimum cutting radius the radius of the arc of the smallest curvature that can be followed by a narrow bandsaw blade of given width 2.2 Elements To promote the fullest understanding the various elements are illustrated inFigure 1, Figure 2 andFigure 3. 2.2.1 body th

28、at part of the blade between the bottom of the gullet and the back edge 2.2.2 teeth the serrations formed along one longitudinal edge of the blade to provide the cutting edges 2.2.3 toothed edge the longitudinal edge along which the teeth have been formed 2.2.4 cutting edge the transverse edge forme

29、d by the intersection of the back and the face of the tooth 2.2.5 face that surface of the tooth adjacent to the cutting edge, on which the chip impinges as it is severed from the work 2.2.6 back that surface behind the cutting edge which extends to the root radius of the gullet 2.2.7 sharpness angl

30、e the angle between the face and the back of the tooth, at the tooth point 2.2.8 clearance angle the angle between the back of the tooth, at the tooth point, and the cutting path 2.2.9 gullet angle (for narrow blades only) that angle, in the gullet, between the front and the back of the tooth 2.2.10

31、 rake (Hook) the angle between the face of the tooth before setting, and a line from the tooth point at right angles to the cutting path 2.2.11 depth the distance from the point of the tooth to the deepest part of the gullet, in a direction at right angles to the cutting path 2.2.12 root radius the

32、radius of the arc between the face and the back in the gullet 2.2.13 gullet the space bounded by the face, root radius and back of a tooth, to contain severed chips 2.2.14 Set The projection of the teeth from each side of the blade to provide cutting clearance.BS4411:1969 2 BSI 12-1999 2.2.14.1 spri

33、ng set the transversant setting of alternative teeth as shown inFigure 1 and Figure 2 2.2.14.2 swage set the spreading of the metal at the point of the tooth, seeFigure 3 2.2.15 overall set the sum of the set on either side of the blade and the thickness of the blade itself 2.3 Linear dimensions 2.3

34、.1 width the overall distance between the point of the tooth and the back edge 2.3.2 thickness the distance between the two sides of the body of the blade NOTEBirmingham wire gauge is often used at present as a measure of thickness. 2.3.3 pitch the distance between the points of two adjoining teeth,

35、 expressed as: a) mm (or teeth per inch) for narrow b) mm (or inches) for wide blades 3 Classification of wide bandsaw blades Three types of wide blade have been specified, each intended for cutting a different density range of timber, as given below. Type A: under 560kg/m 3 . Type B: 560to800kg/m 3

36、 . Type C: over 800kg/m 3 . Examples of species of timber falling within each density range are given below. Under 560kg/m 3 . Norway Spruce, Scots Pine (Baltic Redwood), Hemlock, Obeche, Poplar, African Mahogany. 560 to 800 kg/m 3 . Ash, Beech, Larch, Sapele. Over 800kg/m 3 . Ebony, Jarrah, Rosewoo

37、d. NOTEThe density classification is applicable to most species, but for timber containing chemicals and other abrasive substances, special saws and tooth shapes may be required. 4 Material 4.1 It is recommended that the blades should normally be manufactured from steels containing at least0.7% carb

38、on and conforming to one of the following specifications. For narrow bandsaws: 1) Nickel,0.4% to0.7%; sulphur,0.04% maximum; phosphorus,0.04% maximum; chromium,0.1% to0.4%. 2) Nickel, 0.3% maximum; sulphur0.05% maximum; phosphorus0.05% maximum. For wide bandsaws: Nickel, 1.8% to2.5%; sulphur, 0.02%

39、maximum; phosphorus, 0.02% maximum; chromium,0.15% maximum. For narrow and wide bandsaws, alloy steels of equivalent or superior properties may be used. 4.2 Heat treatment and hardness. The blade shall be heat-treated so that, when tested in accordance with BS427-1 1) , it will comply with the follo

40、wing requirements: 1) For narrow blades: 400H.V. 20minimum. 2) For wide blades: 420H.V. 20minimum. 5 General quality requirements 5.1 The blade shall be uniform in thickness within the appropriate rolling margin given in BS1449 2) . 5.2 The back edge of the blade shall be smoothly dressed. 5.3 The t

41、eeth shall be cut regularly and cleanly along one edge of the blade. 5.4 Blades provided ready for use shall be soundly joined by brazing or by welding. 6 Set 6.1 General requirements 6.1.1 Narrow blades shall be spring set. 6.1.2 Wide blades shall be spring or swage set. 6.2 Dimensional requirement

42、s 6.2.1 It is recommended that the minimum amount of set given to the teeth of the saw blades shall be as shown inTable 1. 6.2.2 The tolerance on the amount of set shall be within the following limits, on any one blade 0.125mm (0.005in) 1) BS 427, “Method for Vickers hardness test”, Part 1, “Testing

43、 of metals”. 2) BS 1449, “Steel plate, sheet and strip”.BS4411:1969 BSI 12-1999 3 7 Dimensions 7.1 Standard widths and recommended thicknesses are given inTable 2 and Table 5. In the case of narrow blades the minimum cutting radius for each blade width is specified. 7.2 The rake angle of the saw too

44、th depends on the type and condition of the timber being cut. 7.2.1 Narrow blades. For narrow bandsaw blades, the normal rake angle is5 , and the normal gullet angle is60 . 7.2.2 Wide blades. For each type of wide bandsaw blade, suitable rake and clearance angles are given inTable 6. 7.3 Recommended

45、 ranges of pitches and gullet depths for narrow and wide blades are given inTable 3 andTable 7 respectively. 7.4 The recommended maximum blade thickness that can be used on a bandsaw wheel of given diameter is given inTable 4 andTable 8. 8 Recommended blade speeds The speed of the bandsaw blade shou

46、ld be confined to the following ranges: 1) For narrow blades: 22 to 30 m/s (4500 to 6000ft/min). 2) For wide blades: 22 to 45 m/s (4500 to 9000ft/min). Attention is drawn to the fact that IT IS DANGEROUS TO INCREASE THE SPEED OF EXISTING MACHINES WITHOUT CONSULTING THE MANUFACTURER.BS 4411:1969 4 BS

47、I 12-1999 Figure 1 Narrow bandsaw tooth profileBS 4411:1969 BSI 12-1999 5 Figure 2 Wide bandsaw tooth profile: spring setBS 4411:1969 6 BSI 12-1999 Figure 3 Wide bandsaw tooth profile: swage setBS4411:1969 BSI 12-1999 7 Table 1 Recommended minimum set for both narrow and wide blades Table 2 Standard

48、 widths and recommended thickness of narrow bandsaw blades Dimensions in mm Type of bandsaw blade Minimum set Narrow 0.25 Wide A 0.45 B 0.40 C 0.40 NOTE 1For classification of saw types see Clause3. NOTE 2The amount of set tends to increase with blade thickness. Dimensions in mm 1 2 3 4 5 6 Width Mi

49、nimum cutting radius Thickness 6 20 0.45 0.55 0.7 10 45 0.45 0.55 0.7 12.5 55 0.45 0.55 0.7 0.8 16 75 0.5 0.6 0.7 0.8 20 100 0.5 0.6 0.7 0.9 25 180 0.7 0.8 0.9 1.0 32 260 0.8 0.9 1.0 40 380 0.8 0.9 1.0 50 0.9 1.0BS4411:1969 8 BSI 12-1999 Table 3 Recommended pitches for narrowbandsaw blades Table 4 Recommended thickness of narrow blades for use on different wheel diameters Table 5 Standard widths and recommended thickness of wide bandsaw blades Table 6 Rake and clearance angles for widebandsaws Table