band saw blade

Abstract

This utility model discloses a band saw blade with saw teeth divided into multiple groups. Each group of saw teeth is further divided into a high-tooth group and a low-tooth group. The height of each subgroup is defined by the tooth height of the second highest saw tooth in the subgroup, and the height of the high-tooth group is greater than that of the low-tooth group. Each high-tooth group and low-tooth group has n saw teeth, and the n saw teeth in each group have different tooth heights. The saw teeth in the high-tooth group and low-tooth group are arranged alternately, with the first saw tooth in the high-tooth group at the front. There is a gap of n teeth between saw teeth with the same function in the low-tooth group and the high-tooth group. A stabilizing plane with a back angle of 0°-5° is ground on the back face of the cutting edge of the high-tooth group saw teeth. This utility model can simulate the dulling edge after natural wear, effectively weaken the gripping effect of the cutting edge, reduce initial impact damage, and significantly improve the initial cutting stability and overall service life of the saw blade.

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 continuous development of material types and the increasing demands on processing, higher requirements are being placed on the cutting life and stability of band saw blades. Among the many factors affecting saw blade performance, tooth design is particularly crucial. An excellent tooth profile not only needs to possess good initial cutting ability but also should ensure uniform wear, smooth chip removal, and maintain a stable cutting state over long-term use.

[0003] The wear of saw teeth can be divided into two stages. The first stage is the initial wear stage, in which the tooth tips are very sharp and may have machining errors or burrs. Directly cutting into the workpiece can easily cause micro-chipping or cracks due to impact, and the wear width increases rapidly to 0.08-0.15mm. The second stage is the stable wear stage, which is mainly characterized by adhesive wear and abrasive wear. The wear width can reach 0.25-0.45mm, until the saw teeth can no longer effectively penetrate the workpiece or substrate and deform and fail.

[0004] Most existing band saw blade designs use a single back angle on the back face. The sharp cutting edge cuts directly into the workpiece without an effective protection mechanism, resulting in problems such as unstable initial wear, large fluctuations in cutting force, and short service life when dealing with difficult-to-cut materials (such as stainless steel and high-temperature alloys). Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the shortcomings of existing band saw blades, such as short service life and unstable initial wear. This utility model provides a band saw blade that can reduce initial impact damage and significantly improve the initial cutting stability and overall service life of the band saw blade.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A band saw blade includes 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 its structural features are as follows:

[0008] Each group of saw teeth is divided into a high-tooth subgroup and a low-tooth subgroup. The height of the subgroup is defined by the tooth height of the second highest saw tooth in each subgroup. The height of the high-tooth subgroup is greater than the height of the low-tooth subgroup.

[0009] The high-tooth group and the low-tooth group each have n serrations. The n serrations in the high-tooth group and the low-tooth group have different tooth heights. The highest serration in the high-tooth group and the low-tooth group have the same tooth height, and the tooth heights of the remaining serrations are smaller than the tooth height of the highest serration, and they are distributed with a certain height difference.

[0010] The high-tooth group saw teeth and the low-tooth group saw teeth are arranged alternately, with the first saw tooth in the high-tooth group at the front. There are n saw teeth between the low-tooth group and the high-tooth group where the saw teeth with the same function are separated.

[0011] A stabilizing plane with a back angle of 0°-5° is ground on the back face of the cutting edge of the high-tooth sub-group saw teeth, and the width of the stabilizing plane is 0.02mm-0.12mm.

[0012] In the above scheme, the cutting edge width L1 of the highest tooth in the high tooth group and / or low tooth group 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.

[0013] In the above scheme, a stabilizing plane with a clearance angle of 0°-5° is ground on the back face of all the saw teeth in the low-tooth group at the cutting edge, and the width of the stabilizing plane is 0.02mm-0.12mm.

[0014] In the above scheme, the rake angle α of the saw teeth in the high tooth group and the low tooth group is -15° to +15°, and the clearance angle is 5° to 38°. This angle design helps to optimize the cutting force distribution and ensure the efficient cutting of the saw blade on different materials.

[0015] In the above scheme, the thickness of the steel strip is Dh, and Dh < Lc < 2*Dh.

[0016] In the above scheme, the height difference of the saw teeth within the high tooth group and the low tooth group is 0.03mm-0.15mm; the height difference of the saw teeth in the high tooth group and the low tooth group is 0.02mm-0.25mm.

[0017] In the above scheme, the chamfer angle Ja of all the saw teeth in the high-tooth group and the low-tooth group is 30°-60°, preferably 45°. In particular, designing the chamfer in the high-tooth group to be 45 degrees helps to reduce vibration and noise during the cutting process.

[0018] In the above scheme, 3 < n < 18, and n is an integer.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1) Improve initial cutting stability

[0021] Problems with the existing technology: The serrations in the existing design are very sharp in the initial use stage, and are prone to micro-chipping or cracking due to impact, which causes the wear width to increase rapidly to 0.08-0.15mm, and the initial wear is unstable.

[0022] This invention grinds a stabilizing plane with a back angle of 0°-5° and a width of 0.02-0.12mm at the top cutting edge of each tooth in the high-tooth group. This simulates the dulling edge after natural wear, effectively weakening the gripping effect of the cutting edge and reducing initial impact damage. This treatment method puts the band saw blade in a relatively stable cutting state from the beginning, improving the consistency and stability of the initial cutting.

[0023] 2) Extend overall service life

[0024] Problem with the existing technology: The band saw blade in the existing technology lacks an effective wear compensation mechanism. All saw teeth directly participate in cutting, resulting in a short overall service life of the saw blade.

[0025] This invention features an improved stepped offset design, where a set of saw teeth consists of two sub-groups: a high-tooth sub-group and a low-tooth sub-group. The high-tooth sub-group initially undertakes the main cutting task, while the low-tooth sub-group gradually takes over the cutting work as wear increases, achieving an effective wear compensation mechanism and improving the overall service life of the band saw blade. Furthermore, the stabilizing plane design on the flank face of the high-tooth sub-group further enhances the impact resistance and durability of the saw teeth, further extending the overall service life of the band saw blade. Tests have shown that this invention extends the service life of the band saw blade by 30% compared to conventional products when cutting 304L stainless steel.

[0026] 3) Improve chip removal performance

[0027] Existing technical problems: For difficult-to-cut materials such as stainless steel and high-temperature alloys, the existing saw blade design does not fully consider how to improve chip removal performance, resulting in chips not being easily discharged during the cutting process, which can easily cause saw teeth to become clogged or excessively worn.

[0028] Improvements of this invention: The design of the stabilizing plane helps to improve the chip formation angle and flow direction, making it easier for chips to detach from the tooth groove and reducing the risk of clogging. Especially when processing long chip materials, this design significantly improves chip removal performance and ensures a smooth cutting process.

[0029] 4) The band saw blade of this utility model has high cutting efficiency: By grouping all the saw teeth on the band saw blade into groups, each group of saw teeth is divided into at least two subgroups, and there is a set height difference between each subgroup. This utility model can allow the saw teeth of each subgroup to participate in the cutting in sequence according to their height during the cutting process, thereby providing higher cutting efficiency for cutting different materials, especially performing well in materials with high hardness.

[0030] 5) 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.

[0031] 6) 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

[0032] 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.

[0033] Figure 1 This is a structural schematic diagram of an embodiment of the band saw blade of this utility model.

[0034] Figure 2 This is a schematic diagram of the band saw blade participating in cutting during a cutting operation according to an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the structure of the band saw blade teeth of this utility model. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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 are divided into multiple groups, each group consisting of a high-tooth group and a low-tooth group.

[0040] The height of each subgroup is defined by the tooth height of the second highest tooth in the subgroup, with the height of the high-tooth subgroup being greater than that of the low-tooth subgroup. In this way, the high-tooth and low-tooth teeth can participate in cutting sequentially, thereby increasing the service life of the band saw blade.

[0041] Each subgroup of saw teeth has n teeth (n is an integer greater than 3 and less than 18). The n teeth in each subgroup have different tooth heights. The highest tooth in both the high-tooth and low-tooth subgroups has the same tooth height, while the tooth heights of the remaining teeth are less than the highest tooth, exhibiting a certain height difference distribution. 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.

[0042] The high-tooth group and the low-tooth group are arranged alternately, with the first tooth in the high-tooth group at the front. The low-tooth group and the high-tooth group have the same function, and the teeth are arranged with n teeth between them.

[0043] A stabilizing plane with a clearance angle of 0°-5° is ground on the back face of the saw teeth at the cutting edge. The width of the stabilizing plane is 0.02mm-0.12mm. This effectively weakens the gripping effect of the saw teeth, reduces initial impact damage, and improves the initial cutting stability and service life of the band saw blade. Furthermore, the inventors of this application have found through experiments that if the angle or width of the stabilizing plane is improperly set (i.e., not within the aforementioned range), it will increase the friction of the cutting edge, leading to an increase in cutting temperature and affecting the durability and cutting performance of the band saw blade.

[0044] 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.

[0045] The front angle α of the sawtooth 2 is -15° to +15°, and the rear angle is 5 to 38°.

[0046] The thickness of the steel strip 1 is Dh, and Dh < Lc < 2*Dh.

[0047] The chamfer angle Ja of the sawtooth 2 is 30-60°.

[0048] The design method of this utility model band saw blade includes:

[0049] 1) A group of saw teeth consists of two subgroups of saw teeth: a high-tooth subgroup and a low-tooth subgroup.

[0050] 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;

[0051] 3) A certain height difference is formed between the saw teeth of the subgroup;

[0052] 4) Grind a stabilizing plane with a back angle of 0°-5° on the back face of the top cutting edge of each tooth in the high-tooth group, and the width of the stabilizing plane is 0.02mm-0.12mm;

[0053] 5) The high-tooth subgroup saw teeth and the low-tooth subgroup saw teeth 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 n.

[0054] 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).

[0055] like Figure 1 , Figure 2As shown, eight saw teeth 2 on the steel strip 1 are distributed along the cutting direction of the saw blade, labeled A, B, C, D, E, F, G, and H from front to back. Saw teeth A, C, E, and G form the high-tooth group, while saw teeth F, H, B, and D form the low-tooth group. Saw teeth A, C, E, and G are the first, second, third, and fourth saw teeth in the high-tooth group, respectively, and saw teeth F, H, B, and D are the first, second, third, and fourth saw teeth in the low-tooth group, respectively. A stabilizing plane S is ground on the back face at the top cutting edge of the high-tooth group. The back angle of the stabilizing plane S is 0°-5°, and its width is 0.02mm-0.12mm. Simultaneously, the tooth height is reduced by approximately 0.010mm to simulate the dulling edge after natural wear. This treatment helps to weaken the gripping effect of the cutting edge, reduce initial impact damage, and put the saw blade in a more stable cutting state from the beginning, thereby improving cutting consistency and extending service life.

[0056] A tooth: This is the first tooth in the high-tooth group, the highest tooth in the high-tooth group, and also the highest tooth among all the 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°, and is taken as 45° in this embodiment). The top width, that is, the cutting edge width of the highest tooth in the high-tooth group La = Lc / 4 - 2 * H1 * cotJa = 0.31 mm, is about 1 / 4 of the tooth width.

[0057] C tooth: The second tooth in the high-tooth group, 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 high-tooth group, is equal to the tooth width or kerf width = 2.04mm.

[0058] E tooth: The third tooth in the high-tooth group, located 0.20mm below A tooth. The top (i.e. the cutting edge) is flat and has a chamfer Ja. The top width, which is the cutting edge width of the third highest tooth in the high-tooth group, Le = Lc * 3 / 4 ​​- 2 * H1 * cot Ja = 1.33mm, is approximately 3 / 4 of the tooth width.

[0059] G tooth: The fourth tooth in the high-tooth group, 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 high-tooth group, Lg = Lc * 1 / 2 - 2 * H1 * cot Ja = 0.82mm, which is about half the tooth width.

[0060] F sawtooth: The first sawtooth in the low tooth group, the shape of the tooth is the same as that of A sawtooth, and the tooth height is equal to that of A sawtooth.

[0061] H sawtooth: The second sawtooth in the low tooth subgroup. 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.

[0062] B sawtooth: The third sawtooth in the low tooth subgroup. 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.

[0063] D-tooth: The fourth tooth in the low-tooth subgroup, its tooth shape is the same as G-tooth, and its tooth height is reduced by 0.075mm compared to G-tooth.

[0064] In this invention, the height difference between the saw teeth in the high-tooth group is designed as H1, ranging from 0.03mm to 0.15mm; the height difference between the saw teeth in the low-tooth group is designed as H2, also ranging from 0.03mm to 0.15mm. The height difference H12 between the high-tooth and low-tooth groups is generally 0.02mm to 0.25mm. In this embodiment, the height difference between the saw teeth in the high-tooth group is designed as H1 = 0.1mm; the height difference between the remaining saw teeth in the low-tooth group (excluding the highest tooth) is designed as H2 = 0.1mm, and the height difference H12 between the high-tooth and low-tooth groups is 0.075mm. This design achieves an effective wear compensation mechanism, extending the overall service life of the band saw blade.

[0065] The positions of the high-tooth group saw teeth and the low-tooth group saw teeth are as follows: Figure 1 The teeth are arranged alternately as shown. In the low-tooth subgroup, the tooth with the same function and height 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 high-tooth subgroup 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 high-tooth subgroup and is 4 teeth away; the fourth highest tooth is tooth H, which has the same cutting edge design as tooth C in the high-tooth subgroup and is 4 teeth away.

[0066] 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.

[0067] like Figure 2 As shown, the height design of the high-tooth and low-tooth subgroups of saw teeth is as follows: from the perspective of the saw blade cutting direction, in this embodiment, the first tooth in each subgroup of saw teeth has the same tooth height and is the highest tooth in the group. The second tooth is always the lowest tooth. Furthermore, within each subgroup of saw teeth, the tooth height gradually increases from the second, third, and fourth teeth along the saw blade cutting direction in increments of 0.1mm to ensure stability and cutting effect during the cutting process.

[0068] 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 high tooth group. Lc > Dh. Generally speaking, Lc < 2 * Dh.

[0069] The chamfer Ja of all the serrations 2 on the steel strip 1 is between 30 and 60 degrees, and is 45 degrees in this embodiment. In particular, the chamfer design of the high tooth group is 45 degrees, which helps to reduce vibration and noise during the cutting process.

[0070] The clearance angle β of the saw tooth tip is 5 to 38 degrees, preferably 20 degrees. The rake angle α of the tooth tip face is -15 to 15 degrees, preferably 10 degrees. These rake and clearance angles help optimize the cutting force distribution and ensure efficient cutting of different materials by the band saw blade.

[0071] The tooth pitch can be either fixed or variable.

[0072] like Figure 3 As shown, a stabilizing plane S with a clearance angle of 0°-5° is ground on the flank face at the top cutting edge of each tooth in the high-tooth group. The width of the stabilizing plane S is 0.02mm-0.12mm, while simultaneously reducing the tooth height by approximately 0.010mm. This effectively weakens the gripping effect of the cutting edge, reduces initial impact damage, and ensures the band saw blade is in a relatively stable cutting state from the start, improving cutting consistency and extending service life. Especially for applications involving difficult-to-cut materials such as stainless steel and high-temperature alloys, this process significantly improves the cutting stability and chip removal performance of the saw blade.

[0073] When this band saw blade is used for cutting, the high-tooth subgroup teeth participate in the cutting first. When the wear of the high-tooth subgroup teeth exceeds the height difference between the high-tooth and low-tooth subgroup teeth, the low-tooth subgroup teeth participate in the cutting, thereby achieving the purpose of extending the service life of the band saw blade. In this process, since the highest teeth in the high-tooth and low-tooth subgroups have the same tooth height, such as teeth A and F in the above embodiment, the highest teeth of each subgroup can participate in the cutting synchronously at the moment of entry, sharing the force of the highest tooth (tooth A) in the high-tooth subgroup, reducing the wear of the highest tooth, and extending the service life of the band saw blade.

[0074] Furthermore, during the initial cutting, the top cutting edge of the high-tooth sub-group saw teeth is ground with a stabilizing plane S. The stabilizing plane S has a clearance angle of 0°-5° and a width of 0.02-0.12 mm, while the tooth height is reduced by approximately 0.010 mm to simulate the dulling edge after natural wear. This treatment helps to weaken the gripping effect of the cutting edge, reduce initial impact damage, and ensure the band saw blade is in a relatively stable cutting state from the start, improving cutting consistency and further extending its service life. Especially in applications involving difficult-to-cut materials such as stainless steel and high-temperature alloys, this process can significantly improve the cutting stability of the band saw blade.

[0075] Experiments have shown that, under the same test cutting equipment and parameters, and with a stabilizing plane S width of 0.03 mm, the cutting area of ​​the product in this embodiment before failure is significantly larger than that of existing band saw blades. In other words, the cutting efficiency and lifespan of this embodiment are significantly superior to existing band saw blades. Please refer to the sawing data comparison in the table below for details:

[0076]

[0077] 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:

[0078] 1) A group of saw teeth consists of two subgroups: a high-tooth subgroup and a low-tooth subgroup.

[0079] 2) The cutting edge design of each subgroup of saw teeth is the same, and each subgroup consists of 4 saw teeth;

[0080] 3) A certain height difference is formed between the sub-group saw teeth. For example, in the above embodiment, the height difference between the first sub-group saw teeth and the second sub-group saw teeth is 0.075mm, and the height difference between the sub-group saw teeth is generally 0.02mm-0.25mm.

[0081] 4) Grind a stabilizing plane with a back angle of 0°-5° on the back face of the top cutting edge of each tooth in the high-tooth group, and the width of the stabilizing plane is 0.02mm-0.12mm;

[0082] 5) The high-tooth subgroup and the low-tooth subgroup are arranged alternately. The principle of the alternation is that the number of teeth between saw teeth with the same cutting edge design in different subgroups is n. 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, i.e., n.

[0083] In other embodiments, the subgroup of saw teeth may also have 5 saw teeth or other numbers of saw teeth, the principle is the same, and will not be repeated here; the first saw tooth in each subgroup of saw teeth is not necessarily the highest and the second saw tooth is the lowest. In this utility model, as long as the saw teeth in each subgroup of saw teeth, except for the highest saw tooth, have a certain height difference distribution, for example, the highest saw tooth can be any saw tooth in the subgroup of saw teeth, and the lowest saw tooth can also be any saw tooth in the subgroup of saw teeth. The band saw blade product in this utility model can be uncoated or coated.

[0084] 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, characterized in that: Each group of saw teeth is divided into a high-tooth subgroup and a low-tooth subgroup. The height of each subgroup is defined by the tooth height of the second highest saw tooth in the subgroup. The height of the high-tooth subgroup is greater than the height of the low-tooth subgroup. The high-tooth group and the low-tooth group each have n serrations. The n serrations in the high-tooth group and the low-tooth group have different tooth heights. The highest serration in the high-tooth group and the low-tooth group have the same tooth height, and the tooth heights of the remaining serrations are smaller than the tooth height of the highest serration, and they are distributed with a certain height difference. The high-tooth group saw teeth and the low-tooth group saw teeth are arranged alternately, with the first saw tooth in the high-tooth group at the front. There are n saw teeth between the low-tooth group and the high-tooth group where the saw teeth with the same function are separated. A stabilizing plane with a back angle of 0°-5° is ground on the back face of the cutting edge of the high-tooth sub-group saw teeth, and the width of the stabilizing plane is 0.02mm-0.12mm.

2. The band saw blade of claim 1, wherein The cutting edge width L1 of the highest tooth in the high-tooth group and / or low-tooth group 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.

3. The band saw blade of claim 1, wherein In the low-tooth group, a stabilizing plane with a back angle of 0°-5° is ground on the back face of all the cutting edges. The width of the stabilizing plane is 0.02mm-0.12mm.

4. The band saw blade of claim 1, wherein The rake angle α of the saw teeth in the high-tooth group and the low-tooth group is -15° to +15°, and the clearance angle is 5° to 38°.

5. The band saw blade of claim 1, wherein The thickness of the steel strip is Dh, and Dh < Lc < 2*Dh.

6. The band saw blade of claim 1, wherein The height difference between the serrations within the high-tooth group and the low-tooth group is 0.03mm-0.15mm; the height difference between the serrations in the high-tooth group and the low-tooth group is 0.02mm-0.25mm.

7. The band saw blade of claim 1, wherein The chamfer angle Ja of all the serrations in the high-tooth group and the low-tooth group is 30°–60°.

8. The band saw blade of claim 1, wherein 3 < n < 18, and n is an integer.

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