Bandsaw blade
With a multi-tooth design, each group of teeth is divided into multiple subgroups, each with different heights and cutting edge widths. The alternating band saw blade design solves the problem of short service life of existing band saw blades, improves cutting efficiency and durability, and performs particularly well in difficult-to-cut materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BICHAMP CUTTING TECH (HUNAN) CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-07-03
AI Technical Summary
Existing band saw blade designs lack optimization for different cutting materials and working conditions, resulting in a short service life. In particular, the cutting efficiency is low and the wear is rapid when cutting difficult materials, and the break-in process also affects the service life.
It adopts a multi-set saw tooth design, with each set of saw teeth divided into multiple sub-groups. Each sub-group of saw teeth has a different height and cutting edge width. Through alternating arrangement and chamfering design, uniform wear and cutting amount distribution of the saw teeth are achieved, improving cutting efficiency and durability.
It improves the cutting efficiency and service life of band saw blades, especially performing exceptionally well in materials with high hardness, reduces vibration and noise, and enhances operating comfort and stability.
Smart Images
Figure CN224444744U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to sawing tools, specifically to a band saw blade. Background Technology
[0002] Band saw blades are widely used for cutting materials such as wood, metal, and stone. With the development of material types, higher requirements are placed on the cutting life of band saw blades, making the tooth profile design an increasingly key factor affecting cutting life and efficiency. The tooth profile design of band saw blades typically needs to ensure sharp tooth tips, uniform wear, and good cutting performance.
[0003] The wear of the band saw teeth can be divided into two stages. The first stage is initial wear, where the wear width of the saw teeth quickly reaches 0.08mm-0.15mm. In this stage, due to the sharpness of the saw teeth and the presence of machining errors and burrs, minor chipping occurs at the tooth tips. The second stage is uniform wear, mainly consisting of adhesive wear and abrasive wear, where the wear width typically reaches 0.25mm-0.45mm. The band saw blade fails when the cutting force reaches a certain level, or when the steel band deforms and cannot maintain perpendicular cutting, or when the saw teeth are worn too much to penetrate the workpiece for cutting.
[0004] Most existing band saw blade designs use a single, grouped tooth arrangement (with each tooth in the group having a relatively uniform shape and angle, lacking optimization for different cutting materials and working conditions), and the tooth width is generally a standard width. Therefore, when cutting with existing band saw blades, all teeth participate in cutting in one cycle (one group of teeth), which results in a short service life for the band saw blade.
[0005] Furthermore, the initial wear stage of existing band saw blades significantly impacts their lifespan. Excessive wear can drastically reduce the blade's lifespan. Generally, a break-in period is required to extend the lifespan of new band saw blades. This results in very little effective cutting during the initial wear stage, particularly when cutting difficult-to-cut materials, leading to low cutting efficiency and short tooth life. Utility Model Content
[0006] The technical problem to be solved by this utility model is to provide a band saw blade that can improve the life of saw teeth for cutting difficult materials, addressing the short service life of existing band saw blades.
[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0008] A band saw blade includes a steel strip and a series of saw teeth fixedly connected to the steel strip. The saw teeth are divided into multiple groups, and each group of saw teeth is divided into m subgroups. Its structural features are as follows:
[0009] The height of a subgroup of saw teeth is defined by the tooth height of the highest tooth in the subgroup. Each subgroup of saw teeth is represented by the first subgroup saw tooth, the second subgroup saw tooth, ... the i-th subgroup saw tooth ... the m-th subgroup saw tooth. The first subgroup saw tooth has a first height, the second subgroup saw tooth has a second height, and so on. The m-th subgroup saw tooth has a m-th height, and the first height > the second height > ... > the m-th height.
[0010] Each subgroup of saw teeth has n teeth, and the n teeth in each subgroup have different tooth heights. Furthermore, the cutting edge width L1 of the highest tooth in each subgroup is L... n / n-2*H1*cotJa, the cutting width L of the lowest serration. n Equal to the kerf width, the cutting edge width of the second highest tooth L2 = L n *2 / n-2*H1*cotJa, the cutting edge width of the third highest serration L3=L n *3 / n-2*H1*cotJa, and so on, the cutting edge width L of the (n-1)th high serration. n-1 =L n *n-1 / n-2*H1*cotJa, where H1 is the height difference of the saw teeth within the subgroup, and Ja is the chamfer angle of the saw teeth;
[0011] The saw teeth in each subgroup are arranged alternately, with the first saw tooth in the first subgroup being at the front. The saw teeth in the i-th subgroup that have the same function as the saw teeth in the first subgroup are separated by (i-1)*n teeth.
[0012] In the above scheme, the rake angle α of the saw teeth is -15° to +15°, and the clearance angle is 5° to 38°.
[0013] In the above scheme, the thickness of the steel strip is Dh, and Dh < Lc < 2*Dh.
[0014] In the above scheme, the height difference of the saw teeth within the subgroup is 0.03mm-0.15mm, and the height difference of the saw teeth in adjacent subgroups is 0.02mm-0.25mm.
[0015] In the above scheme, the chamfer angle Ja of the saw teeth is 30°-60°.
[0016] In one specific embodiment, the first saw tooth in the subgroup of saw teeth is the highest saw tooth, the second saw tooth is the lowest saw tooth, and the height of the third to the nth saw teeth increases sequentially.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1) This utility model band saw blade boasts high cutting efficiency: By grouping all the saw teeth on the band saw blade into groups, each group is further divided into at least two subgroups with a predetermined height difference between them. This allows the saw teeth in each subgroup to participate in the cutting process sequentially according to their height, thus providing higher cutting efficiency for different materials, especially excelling in materials with high hardness. Tests have shown that when using this utility model band saw blade to cut 304L stainless steel, its lifespan is increased by 30% compared to conventional products.
[0019] 2) The band saw blade of this utility model is highly durable: the carbide tooth design greatly improves the service life and wear resistance of the band saw blade, reducing wear and replacement frequency.
[0020] 3) The band saw blade of this utility model is comfortable to operate: the optimized tooth shape and angle design effectively reduces vibration and noise during cutting, and improves the comfort and stability of operation. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a structural schematic diagram of an embodiment of the band saw blade of this utility model.
[0023] Figure 2 This is a diagram showing the arrangement and height distribution of the first and second subgroups of saw teeth in a band saw blade according to an embodiment of the present invention. Detailed Implementation
[0024] The present invention will be further described below with reference to specific preferred embodiments, but this does not limit the scope of protection of the present invention.
[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Please see Figure 1 An embodiment of the band saw blade of this utility model includes a steel strip 1 and a series of saw teeth 2 fixedly connected to the steel strip 1. All saw teeth 2 are straight teeth, and the tooth width is greater than the thickness of the steel strip 1. The saw teeth 2 on the steel strip 1 can be divided into two subgroups, or m subgroups, where m is an integer greater than 2.
[0028] The height of a subgroup of saw teeth is defined by the height of the highest tooth in that subgroup. Each subgroup of saw teeth is sequentially represented as the first subgroup saw tooth, the second subgroup saw tooth, ..., the i-th subgroup saw tooth ... the m-th subgroup saw tooth. The first subgroup saw tooth has a first height, the second subgroup saw tooth has a second height, and so on, with the m-th subgroup saw tooth having the m-th height, and the first height > the second height > ... > the m-th height, where i and m are integers greater than 2. There is a set height difference between different subgroups of saw teeth. This set height difference can be a fixed value or multiple values. For example, the first height can be m, the second height m-1, the third height m-2, ..., with all subgroups of saw teeth having the same height difference of 1. Alternatively, the first height can be m, the second height m-2, the third height m-3, ..., with different height differences such as 2 and 1 between the subgroups of saw teeth.
[0029] Each subgroup of saw teeth has n teeth (n is an integer greater than 3), and the n teeth in each subgroup have different tooth heights. The cutting edge width L1 of the highest tooth in each subgroup is L1 = L n / n-2*H1*cotJa, the cutting width L of the lowest serration. n Equal to the kerf width, the cutting edge width of the second highest tooth L2 = L n *2 / n-2*H1*cotJa, the cutting edge width of the third highest serration L3=L n *3 / n-2*H1*cotJa, and so on, the cutting edge width L of the (n-1)th high serration. n-1 =L n *n-1 / n-2*H1*cotJa, where H1 is the height difference of the saw teeth within the subgroup, and Ja is the chamfer angle of the saw teeth.
[0030] The saw teeth in each subgroup are arranged alternately, with the first saw tooth in the first subgroup being at the front. The saw teeth in the i-th subgroup that have the same function as the saw teeth in the first subgroup are separated by (i-1)*n teeth.
[0031] The height difference between the saw teeth within each subgroup can be a fixed value or multiple values forming different height differences. In this invention, the height difference between saw teeth within a subgroup is 0.03mm–0.15mm; the height difference between adjacent subgroups is 0.02mm–0.25mm.
[0032] The front angle α of the sawtooth 2 is -15° to +15°, and the rear angle is 5° to 38°.
[0033] The thickness of the steel strip 1 is Dh, and Dh < Lc < 2*Dh.
[0034] The chamfer angle Ja of the sawtooth 2 is 30°–60°.
[0035] The design method of this utility model band saw blade includes:
[0036] 1) A group of saw teeth consists of two or more subgroups of saw teeth;
[0037] 2) The cutting edge design of each subgroup of saw teeth is the same, and each subgroup of saw teeth consists of n saw teeth;
[0038] 3) The saw teeth in each subgroup are designed with saw tooth height, cutting edge width and chamfer to ensure that the cutting amount designed for each saw tooth is evenly distributed;
[0039] 4) A certain height difference is formed between the saw teeth of the subgroup;
[0040] The saw teeth of each subgroup are arranged alternately. The principle of the alternate arrangement is that the number of teeth between saw teeth with the same cutting edge design in different subgroups is (i-1)*n.
[0041] The following example illustrates the structure of the band saw blade of this utility model, with each group of saw teeth 2 on the steel strip 1 consisting of eight saw teeth 2, and the eight saw teeth 2 divided into two subgroups (i.e., each subgroup of saw teeth consists of four saw teeth 2).
[0042] like Figure 1 , Figure 2 As shown, eight saw teeth 2 on the steel strip 1 are distributed along the cutting direction of the saw blade, and are labeled in the order of A, B, C, D, E, F, G, H from front to back. Saw teeth A, C, E, and G form the first subgroup of saw teeth, and saw teeth F, H, B, and D form the second subgroup of saw teeth. Saw teeth A, C, E, and G are the first, second, third, and fourth saw teeth in the first subgroup of saw teeth, respectively, and saw teeth F, H, B, and D are the first, second, third, and fourth saw teeth in the second subgroup of saw teeth, respectively.
[0043] A saw tooth: It is the first saw tooth in the first subgroup of saw teeth, the highest tooth in the first subgroup of saw teeth, and also the highest saw tooth in all the saw teeth 2 on the steel strip 1. Its top (i.e. the cutting edge) is flat and has two chamfers Ja (the chamfer Ja is generally in the range of 30-60°, preferably 45°). The top width, that is, the cutting edge width La of the highest saw tooth in the first subgroup of saw teeth, is La = Lc / 4 - 2*H1*cotJa, which is about 1 / 4 of the tooth width.
[0044] C tooth: The second tooth in the first subgroup of teeth, located 0.30mm below A tooth. The top (i.e. the cutting edge) is flat and without chamfer Ja. The top width, which is the cutting edge width Lc of the lowest tooth in the first subgroup of teeth, is equal to the tooth width or kerf width.
[0045] E tooth: The third tooth in the first subgroup of teeth, located 0.20mm below A tooth. The top (i.e. the cutting edge) is flat and has a chamfer Ja. The top width is the cutting edge width Le of the third highest tooth in the first subgroup of teeth, which is approximately 3 / 4 of the tooth width.
[0046] G tooth: The fourth tooth in the first subgroup of teeth, located 0.10mm below A tooth. The top (i.e. the cutting edge) is flat and has a chamfer Ja. The top width is the cutting edge width of the second highest tooth in the first subgroup of teeth, Lg = Lc*1 / 2 - 2*H1*cotJa, which is about half the tooth width.
[0047] F sawtooth: The first sawtooth in the second subgroup of sawtooths. The shape of the tooth is the same as that of A sawtooth, but the tooth height is reduced by 0.075mm compared to A sawtooth.
[0048] H sawtooth: The second sawtooth in the second subgroup of sawtooths. The shape of the tooth is the same as that of C sawtooth, but the tooth height is reduced by 0.075mm compared to C sawtooth.
[0049] B sawtooth: The third sawtooth in the second subgroup of sawtooths. The shape of the tooth is the same as that of E sawtooth, but the tooth height is reduced by 0.075mm compared to E sawtooth.
[0050] D sawtooth: The fourth sawtooth in the second subgroup of sawtooths. The shape of the tooth is the same as that of G sawtooth, but the tooth height is reduced by 0.075mm compared to G sawtooth.
[0051] The height difference between the saw teeth in the first subgroup is designed as H1, ranging from 0.03mm to 0.15mm; the height difference between the saw teeth in the second subgroup is designed as H2, also ranging from 0.03mm to 0.15mm. The height difference H12 between the first and second subgroups is generally 0.02mm to 0.25mm. In this embodiment, the height difference H12 between the first and second subgroups is 0.075mm, specifically, the second subgroup saw teeth are positioned 0.075mm lower than the first subgroup saw teeth.
[0052] The positions of the first subgroup of saw teeth and the second subgroup of saw teeth are as follows: Figure 1 The teeth are arranged alternately as shown. In the second subgroup of teeth, the tooth with the same function as tooth A is tooth F, which is 4 teeth away from tooth A; the second highest tooth is tooth D, which has the same cutting edge as tooth G in the first subgroup of teeth and is 4 teeth away: H / A / B / C; and so on. The third highest tooth is tooth B, which has the same cutting edge design as tooth E in the first subgroup of teeth and is 4 teeth away; the fourth highest tooth is tooth H, which has the same cutting edge design as tooth C in the first subgroup of teeth and is 4 teeth away.
[0053] The cutting edge of each tooth 2 on the steel strip 1 is made of cemented carbide or high-speed steel to improve its wear resistance and cutting efficiency.
[0054] like Figure 2 As shown, the height design of the first and second subgroups of saw teeth is as follows: from the perspective of the saw blade cutting direction, in this embodiment, the second saw tooth in each subgroup is the lowest tooth, with a height difference of 0.3mm from the first saw tooth. Within each subgroup, the height gradually increases from the second, third, and fourth saw teeth along the saw blade cutting direction in increments of 0.1mm to ensure stability and cutting effect during the cutting process.
[0055] The thickness of steel strip 1 is Dh. The kerf width is designed to be equal to the cutting edge width Lc of the second tooth (the tooth with the lowest height) in the first subgroup of saw teeth. Lc > Dh. Generally speaking, Lc < 2 * Dh.
[0056] The chamfer Ja of all the serrations 2 on the steel strip 1 is between 30 and 60 degrees. The clearance angle β of the tooth tip is between 5 and 38 degrees, preferably 20 degrees. The rake angle α of the tooth tip is between -15 and 15 degrees, preferably 10 degrees. The tooth pitch adopts a fixed pitch or variable pitch design.
[0057] When the band saw blade of this utility model is used for cutting, the first subgroup of saw teeth with a first height participates in cutting first. When the wear of the first subgroup of saw teeth with the first height exceeds the height difference between the first and second subgroups of saw teeth, the second subgroup of saw teeth participates in cutting, and so on, until all subgroups of saw teeth participate in cutting, thereby achieving the purpose of improving the service life of the band saw blade.
[0058] Experiments have shown that, under the same test cutting equipment and parameters, the cutting area of the product of this utility model embodiment before failure is significantly larger than that of the existing band saw blade product before failure. In other words, the cutting efficiency and lifespan of this utility model embodiment are significantly superior to those of existing band saw blade products. Please refer to the sawing data comparison table below for details:
[0059] Sample types <![CDATA[Cutting area before failure (m 2 )]]> Failure mode Existing band saw blades 6.69 Cutting angle failure This embodiment features a band saw blade. 14.31 One tooth is missing
[0060] To improve the lifespan of saw teeth for difficult-to-cut materials, this utility model employs a stepped staggered design method for the band saw blade. This method can be applied to designs with two or more subgroups of saw teeth. The specific design method of this embodiment is as follows:
[0061] 1) One group of saw teeth consists of two subgroups of saw teeth;
[0062] 2) The cutting edge design of each subgroup is the same, and each subgroup consists of 4 serrations;
[0063] 3) If the number of saw teeth in a subgroup is n, the cutting amount designed for each saw tooth is evenly distributed through height and chamfer design: Taking a subgroup of saw teeth as an example, the cutting edge width La of the first saw tooth (the highest saw tooth) in each subgroup is La = Lc / 4 - 2 * H1 * cotJa, the cutting edge width Lc of the second saw tooth (the lowest saw tooth) is equal to the kerf width, the cutting edge width Le of the third saw tooth (the third highest saw tooth) is Le = Lc * 3 / 4 - 2 * H1 * cotJa, and the cutting edge width Le of the fourth saw tooth (the second highest saw tooth) is Le = Lc * 1 / 2 - 2 * H1 * cotJa, where H1 is the height difference of the saw teeth in the subgroup, and Ja is the chamfer angle of the saw tooth, so that the cutting amount is evenly distributed.
[0064] 4) The saw teeth of the subgroups form a certain height difference. For example, in the above embodiment, the height difference between the first subgroup saw teeth and the second subgroup saw teeth is 0.075mm, and the height difference between the subgroup saw teeth is generally 0.02-0.25mm.
[0065] 5) The saw teeth of the subgroups are arranged in an alternating manner, where the principle of the alternating arrangement is: the first saw tooth in the first subgroup is placed at the front, and the saw teeth in the i-th subgroup that have the same function as the saw teeth in the first subgroup are separated by (i-1)*n teeth. In this embodiment, the number of teeth between saw teeth with the same cutting edge design in different subgroups is the number of teeth in the subgroup.
[0066] In other embodiments, the subgroup of saw teeth may also have 5 teeth or other numbers of teeth, with the same working principle, which will not be repeated here. The first saw tooth in each subgroup is not necessarily the highest and the second the lowest; as long as the saw teeth in each subgroup have a certain height difference, for example, the highest saw tooth can be any one of the saw teeth in the subgroup, and the lowest saw tooth can also be any one of the saw teeth in the subgroup. The band saw blade product in this invention can be uncoated or coated.
[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model should fall within the protection scope of the technical solution of this utility model.
Claims
1. A band saw blade, comprising a steel strip and a series of saw teeth fixedly connected to the steel strip, wherein the saw teeth are divided into multiple groups, and each group of saw teeth is divided into m subgroups, characterized in that: The height of a subgroup of saw teeth is defined by the tooth height of the highest tooth in the subgroup. Each subgroup of saw teeth is represented by the first subgroup saw tooth, the second subgroup saw tooth, ... the i-th subgroup saw tooth ... the m-th subgroup saw tooth. The first subgroup saw tooth has a first height, the second subgroup saw tooth has a second height, and so on. The m-th subgroup saw tooth has a m-th height, and the first height > the second height > ... > the m-th height. Each subgroup of saw teeth has n teeth, and the n teeth in each subgroup have different tooth heights. Furthermore, the cutting edge width L1 of the highest tooth in each subgroup is L... n / n-2*H1*cotJa, the cutting width L of the lowest serration. n Equal to the kerf width, the cutting edge width of the second highest tooth L2 = L n *2 / n-2*H1*cotJa, the cutting edge width of the third highest serration L3=L n *3 / n-2*H1*cotJa, and so on, the cutting edge width L of the (n-1)th high serration. n-1 =L n *n-1 / n-2*H1*cotJa, where H1 is the height difference of the saw teeth within the subgroup, and Ja is the chamfer angle of the saw teeth; The saw teeth in each subgroup are arranged alternately, with the first saw tooth in the first subgroup being at the front. The saw teeth in the i-th subgroup that have the same function as the saw teeth in the first subgroup are separated by (i-1)*n teeth.
2. The band saw blade of claim 1, wherein The rake angle α of the saw teeth is -15° to +15°, and the clearance angle is 5° to 38°.
3. The band saw blade of claim 1, wherein The thickness of the steel strip is Dh, and Dh < Lc < 2*Dh.
4. The band saw blade of claim 1, wherein The height difference of the saw teeth within the subgroup is 0.03mm-0.15mm; the height difference of the saw teeth in adjacent subgroups is 0.02mm-0.25mm.
5. The band saw blade of claim 1, wherein The chamfer angle Ja of the saw teeth is 30°–60°.
6. The band saw blade according to claim 1, characterized in that, In the subgroup of saw teeth, the first saw tooth is the highest saw tooth, the second saw tooth is the lowest saw tooth, and the height of the third to the nth saw teeth increases sequentially.