1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 3877 : 1991 Incorporat
2、ing Amendment No. 1 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Metal cutting bandsaw bladesBS 3877 : 1991 Issue 2, August 1996 This British Standard, having been prepared under the direction of the Machine, Engineers and Hand Tools Standards Policy Commi
3、ttee, was published under the authority of the Standards Board and comes into effect on 31 October 1991 BSI 1991 First published March 1965 Second edition June 1979 Third edition October 1991 The following BSI references relate to the work on this standard: Committee reference MTE/20 Draft for comme
4、nt 90/74122 DC ISBN 0 580 19645 3 Amendments issued since publication Amd. No. Date Text affected 9133 August 1996 Indicated by a sideline in the margin Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machine, Engineers and Hand Tools St
5、andards Policy Committee (MTE/-) to Technical Committee MTE/20, upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute British Hacksaw and Bandsaw Manufacturers Association Gauge and Tool Makers AssociationBS 3877 : 1991 1 Contents Page Committees resp
6、onsible Inside front cover Foreword 2 Specification 1 Scope 3 2 Definitions 3 3 Blade widths, thicknesses and pitches 7 4 Dimensions of different types of bandsaw 9 5 T esting 13 6 Hardness of various blade types 14 7 General quality 14 Appendix A Recommended safety precautions 15 Tables 1 Blade wid
7、ths 7 2 Blade thicknesses 7 3 Blade pitches 7 4 Carbon steel flexible bandsaw 9 5 Carbon steel toughened bandsaw 10 6 Bimetallic bandsaw 11 7 V aripitch bimetallic bandsaw 12 Figures 1 Nomenclature 4 2 Nomenclature, side set and overall set 5 3 T ooth shapes 6 4 Types of set 8 5 Flatness 8 6 Flexing
8、 tests 13BS 3877 : 1991 2 Foreword This British Standard has been prepared under the direction of the Machine, Engineers and Hand T ools Standards Policy Committee in cooperation with the British Hacksaw and Bandsaw Manufacturers Association. It supersedes BS 3877 : 1979 which is withdrawn. BS 3877
9、: 1991 takes into consideration agreements of the International Organization for Standardization (ISO) reached on this subject as contained in ISO 4875-1, ISO 4875-2 and ISO 4875-3, but differs from these specifications in some respects, mainly insofar as types and listed sizes are concerned and the
10、 respective tolerances on widths and flatness. It also differs from the ISO standards in that additional clauses have been added to cover testing and general quality requirements. This revision now covers only three basic types of metal cutting bandsaw blades, carbon steel flexible, carbon steel tou
11、ghened and bimetallic bandsaws; other types have been excluded. One essential feature of this revision that has been retained is the main metric physical dimensions (widths, thicknesses and pitches of tooth) which follow a recognized Renard series of preferred numbers (see BS 2045). Imperial dimensi
12、ons are no longer included. Compliance with a British Standard does not of itself confer immunity from legal obligations.3 BS 3877 : 1991 Specification 1 Scope This British Standard specifies dimensions and tolerances for the following types of metal cutting bandsaw blades supplied either in coil fo
13、rm or cut to length and joined ready for use: a) carbon steel flexible bandsaw; b) carbon steel toughened bandsaw; c) bimetallic bandsaw. This standard includes a clause on testing but only insofar as a bend or flexing test is concerned. It also includes some other characteristics of the bandsaw. Sa
14、fety recommendations are given in appendix A. NOTE. The 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 bandsaw An endless blade manufactured from a continuous s
15、trip of steel having one toothed edge. NOTE. See figure 1 (a). 2.2 Elements of the blade 2.2.1 body That part of the blade between the bottom of the gullet and the back edge. NOTE. See figure 1 (a). 2.2.2 teeth The serrations formed across the thickness of the blade to provide cutting edges. NOTE. S
16、ee figure 1 (a). 2.2.3 toothed edge The longitudinal edge along which the teeth have been formed. NOTE. See figure 1 (a). 2.2.4 back edge The longitudinal edge parallel to the toothed edge. NOTE. See figure 1 (a). 2.2.5 side The flat surface beween the toothed edge and the back edge. NOTE. See figur
17、e 1 (a). 2.2.6 width The overall distance between the point of the non-set tooth and the back edge. NOTE. See figure 1 (b).4 BS 3877 : 1991 (a) (b) (c) (d) Figure 1. Nomenclature5 BS 3877 : 1991 2.2.7 thickness The distance between the two sides of the body. NOTE. See figure 2. Figure 2. Nomenclatur
18、e, side set and overall set 2.3 Characteristics of the teeth 2.3.1 pitch The distance between the apices of adjacent teeth, measured in millimetres. NOTE. See figure 1 (b). 2.3.2 teeth per unit length The number of complete teeth per 25 mm length. NOTE. See figure 1 (b). 2.3.3 cutting edge That edge
19、 of the face which is intended to perform cutting. It is formed by the intersection of the flank and the face. NOTE. See figure 1 (c). 2.3.4 depth The distance from the point of the tooth to the deepest portion of the gullet. NOTE. See figure 1 (d). 2.3.5 face That surface of the tooth adjacent to t
20、he cutting edge on which the chip impinges as it is severed from the work. NOTE. See figure 1 (c). 2.3.6 flank That surface behind the cutting edge which extends to the root radius. NOTE. See figure 1 (c). 2.3.7 gullet The space bounded by the face, root radius and flank of a tooth which permits chi
21、p removal. NOTE. See figure 1 (c). 2.3.8 root radius The radius connecting the face of one tooth and the flank of the preceding one. NOTE. See figure 1 (c). 2.3.9 wedge angle The included angle between the face and the flank of the non-set tooth. NOTE. See figure 1 (d). 2.3.10 flank radius The radiu
22、s at the base of the flank. NOTE. See figure 1 (d). 2.3.11 reference plane The plane through the selected point on the cutting edge chosen so as to be perpendicular to the back edge. NOTE. See figure 1 (a). 2.3.12 radial or positive rake The angle between the face and the reference plane of a non-se
23、t tooth or an assumed non-set tooth. NOTE.1. Radial rake angle is 0. NOTE.2. Positive rake angle is at the manufacturers discretion. See figure 3(a), (b) and (e) for radial rake and figure 3(c), (d) and (f) for positive rake. 2.4 Side set and overall set 2.4.1 side set The projection of the teeth fr
24、om the side of the blade to provide cutting clearance. NOTE. See figure 2. 2.4.2 total set The sum of the amount of setting on both sides of the blade not including the blade thickness. NOTE. See figure 2. 2.4.3 overall set The total thickness of the blade taking into account the set on either side
25、of the blade which determines the overall width of cut. NOTE. See figure 2. 2.5 Tooth shapes NOTE. Tooth shape may vary according to manufacture and use. The basic tooth shapes are as listed in 2.5.1 to 2.5.5. 2.5.1 regular tooth A tooth having zero degree rake angle and full round gullets. NOTE. Se
26、e figure 3 (a). 2.5.2 skip tooth A tooth of basically regular tooth shape, every alternate tooth being removed thus obtaining a large pitch giving a longer tooth gullet without making the tooth depth too great at the expense of blade strength. NOTE. See figure 3 (b).6 BS 3877 : 1991 Figure 3. Tooth
27、shapes7 BS 3877 : 1991 Table 1. Blade widths (mm) Carbon steel 3 5681 01 31 62 02 53 2 Bimetallic 6 10 13 18.7 27 34 41 54 67 80 Table 2. Blade thicknesses (mm) 0.4 0.5 0.6 0.8 0.9 1.1 1.3 1.6 Table 3. Blade pitches (mm) Tooth pitch 0.8 1 1.4 1.8 2.5 3.2 4 6.3 8 12.5 20 32 Number of teeth per 25 mm
28、32 24 18 14 10 8 6 4 3 2 1.25 0.75 NOTE. The following tooth combinations are also available in variable pitch bandsaw. The numbers refer to the approximate equivalent number of teeth at the coarsest and finest positions in the variable pitch cycle. 1/2 2/3 3/4 4/6 5/8 6/10 8/12 10/14 2.5.3 hook too
29、th A tooth similar to a regular or skip tooth except that the rake of the tooth is positive. NOTE. See figure 3 (c). 2.5.4 positive rake tooth A tooth similar to the regular tooth form except that the rake angle is positive and the tooth may have a duplex wedge angle. NOTE. See figure 3 (d). 2.5.5 v
30、ariable tooth Normally a regular or positive tooth shape but where the tooth pitch and depth varies progressively from large to small then back to large over a short distance, the cycle being repeated throughout the bandsaw. NOTE. The positive version may have a duplex wedge angle. See figure 3 (d).
31、 2.6 Types of set 2.6.1 raker set The transverse setting of individual teeth, one set to the right, one to the left, and one non-set (or vice versa). NOTE. See figure 4 (a). 2.6.2 wavy set The transverse setting of groups of teeth, set to the right and left, the amount of set varying in a sinusoidal
32、 manner along the bandsaw. NOTE. See figure 4 (b). 2.6.3 variable raker set Used on regular and variable tooth bandsaws where teeth are set in a balanced pattern repeated over the distance of the multipitch. NOTE. See figure 4 (c). 2.7 Types of metal cutting bandsaw blades 2.7.1 carbon steel flexibl
33、e blades Blades made from high carbon, low alloy steel; the toothed edge is heat treated to a high hardness, but above the base of the gullet so that flexibility is not impaired. NOTE. The body of the blade is generally non-heat treated and is therefore soft. 2.7.2 carbon steel toughened blades Blad
34、es similar to the carbon steel flexible type except that the body has been treated to offer a higher degree of stiffness. 2.7.3 bimetallic blades Blades made with a cutting edge of different material, although not the whole tooth, to that of the rest of the blade. NOTE. Normally the cutting edge is
35、high speed steel, M2, Matrix II, M42 being common, while the rest of the blade is a low alloy spring steel. 3 Blade widths, thicknesses and pitches 3.1 Basic dimensions The blade widths, thicknesses and pitches shall be selected from the series of preferred numbers as detailed in tables 1, 2 and 3 r
36、espectively. NOTE. These are nominal sizes only for blade selection purposes. 3.2 Tolerances NOTE. No specific tolerances are quoted for blade widths, thicknesses and pitches since these are at the discretion of the manufacturer in order to optimize the performance of the bandsaw and could vary depe
37、nding upon application. 3.2.1 Tooth set The variation in set shall be toleranced as follows. a) The side set on opposite sides of the blade shall not differ at any point by more than 0.1 mm. b) The overall set at any point of the blade shall not differ from that at any other point of the same blade
38、by more than 0.2 mm. NOTE. The amount of overall set is at the manufacturers discretion. 3.2.2 Flatness (See figure 5.) The blade shall be flat across the sectional profile exclusive of set within the tolerance of 0.02 mm per 10.0 mm of blade width.8 BS 3877 : 1991 Figure 4. Types of set Figure 5. F
39、latness9 BS 3877 : 1991 Table 4. Carbon steel flexible bandsaw Dimensions (width3 thickness) Tooth shape Tooth pitch (mm) 12.5 8.0 6.3 4.0 3.2 2.5 1.8 1.4 1.0 0.8 Teeth per 25 mm 234681 01 41 82 43 2 mm 33 0.6 Regular * * W Skip Hook 53 0.6 Regular * * W W Skip * Hook 63 0.6 Regular *WW Skip * * Hoo
40、k * * 83 0.6 Regular *W Skip Hook 103 0.6 Regular *W Skip * * * Hook * * * 133 0.5 Regular * * * Skip Hook 133 0.6 Regular *W Skip * * * Hook * * * 163 0.8 Regular * Skip * * * Hook * 203 0.8 Regular * Skip * * Hook * * 253 0.9 Regular * Skip * * Hook * * 323 1.1 Regular * * * Skip * Hook * * NOTE 1
41、. * = sizes that are usually available. NOTE 2. W = wavy set. 4 Dimensions of different types of bandsaw Dimensions shall be as given in tables 4 to 7. NOTE. The sizes given in tables 4 to 7 are regarded as standard and are normally carried in stock by British manufacturers.10 BS 3877 : 1991 Table 5
42、. Carbon steel toughened bandsaw Dimensions (width 3thickness) Tooth shape Tooth pitch (mm) 12.5 8.0 6.3 4.0 3.2 2.5 1.8 1.4 1.0 0.8 Teeth per 25 mm 234681 01 41 82 43 2 mm 33 0.6 Regular W W Skip Hook 53 0.6 Regular Skip Hook 63 0.6 Regular *WW Skip * * Hook * * 83 0.6 Regular Skip Hook 103 0.6 Reg
43、ular * W Skip * * Hook * * * 133 0.5 Regular Skip Hook 133 0.6 Regular * * *W *W *W *W Skip * * * Hook * * * 163 0.8 Regular * * * Skip * * Hook * 203 0.8 Regular * * *W *W * Skip * * Hook * * 253 0.9 Regular * Skip * * Hook * * 323 1.1 Regular * * * Skip * Hook NOTE 1. * = sizes that are usually av
44、ailable. NOTE 2. W = wavy set.11 BS 3877 : 1991 Table 6. Bimetallic bandsaw Dimensions (width 3thickness) Tooth shape Tooth pitch (mm) 32 20 12.5 8.0 6.3 4.0 3.2 2.5 1.8 Teeth per 25 mm 0.75 1.2 2 3 4 6 8 10 14 mm 63 0.6 Regular * * Hook * Positive 63 0.9 Regular * * Hook * Positive 103 0.6 Regular
45、* * * Hook * Positive 103 0.9 Regular * * * Hook * Positive 133 0.6 Regular * Hook * * Positive 133 0.9 Regular * Hook * * * Positive 18.73 0.9 Regular * Hook * * Positive 273 0.9 Regular * Hook * * * * Positive * * * * 343 1.1 Regular * * * Hook * * * * Positive * * * * 413 1.3 Regular * * Hook * *
46、 * * Positive * * * * 543 1.6 Regular Hook * * * * Positive * 673 1.6 Regular Hook * Positive * 803 1.6 Regular Hook Positive * * * NOTE. * = sizes that are usually available.12 BS 3877 : 1991 Table 7. Varipitch bimetallic bandsaw Dimensions (width3 thickness) Tooth shape Teeth per 25 mm 1/2 2/3 3/4
47、 4/6 5/8 6/10 8/12 10/14 mm 63 0.6 var-regular * var-positive 63 0.9 var-regular * var-positive 103 0.6 var-regular * var-positive 103 0.9 var-regular * var-positive 133 0.6 var-regular * * var-positive 133 0.9 var-regular * * * var-positive 18.73 0.9 var-regular * * * * * var-positive * 273 0.9 var
48、-regular * * * var-positive * * * 343 1.1 var-regular * var-positive * * * 413 1.3 var-regular * var-positive * * * 543 1.6 var-regular * var-positive * * 673 1.6 var-regular var-positive * * * 803 1.6 var-regular var-positive * * NOTE. * = sizes that are usually available.13 BS 3877 : 1991 (a) (b)
49、All dimensions are in millimetres. Figure 6. Flexing tests 5 Testing 5.1 Flexing tests 5.1.1 Carbon steel flexible bandsaw A sample of blade shall be bent round the circumference of a test bar of 60 mm diameter. Upon being released, the blade shall be capable of being straightened without fracture. The hardened portion of the tooth shall not protrude into the gullet region. See figure 6(a). 5.1.2 Carbon steel toughened bandsaw and bimetallic bandsaw A sample of the blade shall be bent round half the circumference of a test ba
