Trimetal band saw blade and manufacturing method

Abstract

The invention provides a three-metal-band saw blade and a manufacturing method, and relates to the technical field of metal cutting tools. The device comprises a belt body part, first tooth parts and second tooth parts, the number of the first tooth parts and the number of the second tooth parts are both multiple, the first tooth parts and the second tooth parts are both fixedly connected with the same side edge of the belt body part, and all the first tooth parts and all the second tooth parts are all distributed in the length direction of the belt body part; the belt body part is made of spring steel materials, the first tooth part is made of high-speed steel or alloy steel materials, tooth tips on the second tooth part are made of hard alloy materials, and the areas, except the tooth tips, of the second tooth part are made of high-speed steel or alloy steel materials.

Description

Technical Field

[0001] This invention relates to the field of metal cutting tool technology, and in particular to a trimetal band saw blade and its manufacturing method. Background Technology

[0002] Existing band saw blades are mainly divided into two categories: bimetal band saw blades and carbide band saw blades. Bimetal band saw blades are mostly made of high-speed steel teeth and spring steel backing material, which are electron beam welded together. Although they have good toughness, their wear resistance is insufficient when cutting high-strength alloy materials. Carbide band saw blades have excellent wear resistance, but their teeth are mostly connected to the band body by brazing, which can easily lead to problems such as tooth tip detachment and weld cracks under high impact loads and cyclic bending conditions. In addition, existing band saw blades are mostly single-layer or double-layer material structures, which have limited fatigue resistance and are prone to fracture failure after long-term continuous operation. Therefore, there is an urgent need to develop a new type of band saw blade with higher structural stability, stronger fatigue resistance, and excellent wear resistance. Summary of the Invention

[0003] The purpose of this invention is to provide a tri-metal band saw blade and a method for manufacturing it. The preferred technical solutions among the various technical solutions provided by this invention and their numerous technical effects are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a trimetal band saw blade, comprising a band body, a first tooth, and a second tooth, wherein there are multiple first teeth and multiple second teeth, and both the first teeth and the second teeth are fixedly connected to the same side of the band body, and all the first teeth and all the second teeth are distributed along the length of the band body; The belt body is made of spring steel, the first tooth is made of high-speed steel or alloy steel, the tooth tips on the second tooth are made of cemented carbide, and the area of ​​the second tooth other than the tooth tips is made of high-speed steel or alloy steel.

[0006] Optionally, the first tooth and the second tooth are alternately distributed along the length direction of the belt body.

[0007] Optionally, at least two first teeth are provided between two adjacent second teeth.

[0008] Optionally, four or six first teeth are provided between two adjacent second teeth.

[0009] Optionally, both the first tooth and the second tooth are welded to the belt body.

[0010] Optionally, the first tooth is provided with a lateral bending structure.

[0011] Optionally, each of the first teeth alternately bends to the left and to the right along the length of the belt body.

[0012] The present invention provides a method for manufacturing a tri-metal band saw blade, comprising the following steps: Step S1, Raw material preparation and pretreatment: Select spring steel as the raw material for the strip body and process the raw material for the strip body into a strip body blank plate of a preset size; select high-speed steel or alloy steel as the raw material for the teeth and process the raw material for the teeth into tooth blank strips; select cemented carbide as the raw material for the tooth tips and process the raw material for the tooth tips to produce multiple tooth tip blanks with the same specifications. Step S2, Blank welding process: The blank plate of the belt body and the blank strip of the toothed part are fixedly connected by electron beam welding or laser welding process; Step S3, blank milling: The tooth blank is milled according to the preset tooth shape. After milling, the corresponding teeth are split to form a band saw blade blank. Step S4, Blank heat treatment: The band saw blade blank is subjected to graded quenching and tempering treatment; Step S5, Welding and Grinding: The tooth tip blank is welded to the position on the saw blade blank that lacks a tooth tip using brazing-free welding. After welding, it is ground to complete the product preparation.

[0013] Optionally, in step S3, the preset tooth profile includes a complete tooth profile and a missing tooth profile. After the milling process is completed, the tooth portion formed according to the complete tooth profile is subjected to tooth splitting, while the missing tooth portion formed according to the missing tooth profile is not subjected to tooth splitting.

[0014] Optionally, in step S5, the tooth tip blank is provided in a one-to-one correspondence with the missing tooth portion, and each tooth tip blank is welded to a corresponding missing tooth portion.

[0015] This invention provides a tri-metal band saw blade. The band body is made of spring steel, which retains the excellent toughness and bending resistance of spring steel. It can adapt to the periodic bending conditions during the operation of the band saw blade, improve the overall fatigue resistance of the band body, avoid fracture failure, and ensure the stability and safety of long-term continuous cutting operations. The first tooth is made of high-speed steel or alloy steel, which has good toughness and a certain degree of wear resistance. The tip of the second tooth is made of cemented carbide, and the rest of the area is made of high-speed steel or alloy steel. This not only gives full play to the excellent wear resistance of the cemented carbide tip, but also improves the structural stability of the connection between the tooth and the band body, avoiding failure problems such as tooth tip detachment and welding cracks. Through the tri-metal synergistic design of the band body, the first tooth, and the second tooth, toughness, wear resistance, and structural stability are all taken into account. This not only makes up for the performance defects of the two existing mainstream band saw blades, but also adapts to the cutting needs of different strengths and types of materials, extends the service life of the band saw blade, reduces the cost of use, and improves the continuity and efficiency of cutting operations, meeting the cutting needs of modern industry for high strength, high efficiency, and high safety. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the trimetal band saw blade provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the trimetal band saw blade provided in an embodiment of the present invention from another angle.

[0018] 1. Body part in the diagram; 2. First tooth; 3. Second tooth section. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should also 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The present invention provides a trimetal band saw blade, comprising a band body 1, a first tooth 2, and a second tooth 3, wherein there are multiple first tooth 2 and second tooth 3, and both the first tooth 2 and the second tooth 3 are fixedly connected to the same side of the band body 1, and all the first tooth 2 and all the second tooth 3 are distributed along the length of the band body 1. The band saw blade has a body 1 made of spring steel, a first tooth 2 made of high-speed steel or alloy steel, and a second tooth 3 with tooth tips made of cemented carbide, with the remaining area of ​​the second tooth 3 made of high-speed steel or alloy steel. This invention provides a tri-metal band saw blade where the body 1 is made of spring steel, inheriting the excellent toughness and bending resistance of spring steel. This allows it to adapt to the cyclic bending conditions during band saw operation, improving the overall fatigue resistance of the band body, preventing fracture failure, and ensuring the stability and safety of long-term continuous cutting operations. The first tooth 2 is made of high-speed steel or alloy steel, possessing good toughness and a certain degree of wear resistance. The second tooth 3 has tooth tips made of cemented carbide, with the remaining area made of high-speed steel or alloy steel, thus leveraging the excellent wear resistance of the cemented carbide tooth tips. This design also improves the structural stability of the connection between the tooth section and the belt body section 1, avoiding failure problems such as tooth tip detachment and welding cracks. Through the three-metal collaborative design of the belt body section 1, the first tooth section 2, and the second tooth section 3, a balance is achieved between toughness, wear resistance, and structural stability. This not only makes up for the performance defects of the two existing mainstream band saw blades, but also adapts to the cutting needs of different strengths and types of materials, extends the service life of the band saw blade, reduces the cost of use, and improves the continuity and efficiency of cutting operations, meeting the cutting needs of modern industry for high strength, high efficiency, and high safety.

[0023] As an optional implementation, the first tooth 2 and the second tooth 3 are alternately distributed along the length direction of the band saw body 1. This distribution method can make the first tooth 2 and the second tooth 3 evenly matched, avoid excessive local wear, and ensure the force balance during the cutting process, further improving the fatigue resistance of the band saw blade and adapting to medium and low intensity, batch cutting scenarios.

[0024] As an optional implementation, at least two first teeth 2 are provided between two adjacent second teeth 3. This scheme allows for flexible adjustment of the density of the second teeth 3 according to the hardness of the cutting material, ensuring high-strength cutting and wear resistance while reducing the manufacturing cost of the band saw blade, avoiding excessive consumption of cemented carbide materials, and adapting to various cutting scenarios with mixed strengths. Furthermore, four or six first teeth 2 are provided between two adjacent second teeth 3.

[0025] As an optional implementation, both the first tooth 2 and the second tooth 3 are welded to the belt body 1, and the strong welded connection further improves the structural stability.

[0026] As an optional implementation, the first tooth 2 is provided with a lateral bending structure, and each of the first tooth 2 and the second tooth 3 alternately bends to the left and right along the length direction of the band saw body 1. The alternating lateral bending structure can fully optimize the chip removal space, reduce chip clogging and cutting resistance, and further improve the fatigue resistance and cutting smoothness of the band saw blade. Furthermore, the second tooth 3 can also be provided with a lateral bending structure as needed.

[0027] This invention provides a method for manufacturing a trimetal band saw blade, comprising the following steps: Step S1, Raw Material Preparation and Pre-treatment: Select spring steel as the raw material for the strip body and process it into a strip body blank plate of a preset size; select high-speed steel or alloy steel as the raw material for the teeth and process it into tooth blank strips; select cemented carbide as the raw material for the tooth tips and process it to produce multiple tooth tip blanks of the same specifications; all raw materials must meet the standard requirements of the corresponding materials, and remove the surface oxide layer, impurities and burrs. Furthermore, the strip body blank plate needs to be precisely leveled and slit before welding, and the edges need to be ground to ensure the purity and perpendicularity of the joint surface; Step S2, Blank Welding Process: Electron beam welding or laser welding is used to fix the blank plate of the strip body to the blank strip of the tooth part; to achieve atomic-level metallurgical bonding, the bonding interface is dense and defect-free, which not only ensures a sufficiently high bonding strength, but also does not damage the overall toughness of the blank plate of the strip body, and avoids the damage to the toughness of the strip body caused by traditional welding, thus greatly reducing the risk of tooth detachment and breakage during use. Step S3, Blank Milling Process: Mill the tooth blank strip according to the preset tooth shape. Use a forming milling cutter to mill the tooth shape on one side of the welded tooth blank strip. After milling, perform tooth splitting on the corresponding teeth. The teeth can be moved to both sides according to a specific logic (such as alternating left and right, or left, middle, and right cycle) to make the kerf width slightly larger than the saw body thickness, to prevent the "saw clamping" phenomenon when cutting large cross-section materials, and to provide chip removal space, forming a band saw blade blank. The tooth shape size and distribution accuracy can be precisely controlled. Step S4, Blank Heat Treatment: The band saw blade blank undergoes graded quenching and tempering. Graded quenching involves heating the band saw blade blank at a high temperature of 1100℃-1200℃ and then rapidly cooling it. Extremely precise temperature control is required to prevent weld cracking. Tempering usually requires three or more tempering processes to eliminate welding and quenching stress. This ensures high hardness and red hardness of the teeth and tooth tips while achieving a suitable strength and toughness match in the band body 1, reducing internal stress and deformation, and improving the band saw blade's fatigue resistance, impact resistance, and high-temperature wear resistance under continuous cutting conditions. Step S5, Welding and Grinding: The tooth tip blank is brazed to the position on the corresponding saw blade blank where the tooth tip is missing using brazing. After welding, it is ground to complete the product preparation. Lateral bending can also be added as needed. Precision blanks of uniform specifications are used for the tooth tips. After welding, they are ground uniformly to ensure regular tooth shape, uniform lateral bending angle, and high tooth separation accuracy, improving sawing stability and cut quality. After the product is completed, a comprehensive inspection is performed, including tooth distribution accuracy, welding strength, lateral bending angle, and material conformity. Unqualified products are rejected; qualified products undergo surface rust prevention treatment.

[0028] As an optional implementation, in step S3, the preset tooth profile includes a complete tooth profile and a missing tooth profile. After milling, the tooth portion formed according to the complete tooth profile is split into teeth, forming the first tooth portion 2. The missing tooth portion formed according to the missing tooth profile is not split into teeth. By reserving the tooth tip welding position in the missing tooth profile, the tooth tip can be accurately aligned and welded. With subsequent comprehensive inspection (tooth accuracy, welding strength, angle, material conformity, etc.), defective products can be effectively eliminated, resulting in higher production stability and yield.

[0029] As an optional implementation, in step S5, the tooth tip blanks are set one-to-one with the missing tooth parts, and each tooth tip blank is welded to a corresponding missing tooth part to achieve precise alignment welding of the tooth tips. After welding is completed, a second tooth part 3 is formed at that location.

[0030] The belt body 1 is constructed using spring steel, the teeth using high-speed steel or alloy steel, and the tooth tips using cemented carbide, achieving a three-metal gradient composite structure. The belt body 1 maintains good toughness and fatigue strength, the teeth ensure cutting rigidity, and the tooth tips utilize cemented carbide to achieve high hardness and high wear resistance. Overall, it combines fracture resistance, impact resistance, and efficient cutting capabilities, significantly improving service life.

[0031] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tri-metal band saw blade, characterized in that, It includes a belt body (1), a first toothed part (2), and a second toothed part (3), wherein, There are multiple first teeth (2) and second teeth (3). Both first teeth (2) and second teeth (3) are fixedly connected to the same side of the belt body (1). All first teeth (2) and all second teeth (3) are distributed along the length of the belt body (1). The belt body (1) is made of spring steel, the first tooth (2) is made of high-speed steel or alloy steel, the tooth tip on the second tooth (3) is made of hard alloy, and the area of ​​the second tooth (3) other than the tooth tip is made of high-speed steel or alloy steel.

2. The trimetal band saw blade according to claim 1, characterized in that, The first tooth (2) and the second tooth (3) are alternately distributed along the length direction of the belt body (1).

3. The trimetal band saw blade according to claim 1, characterized in that, At least two first teeth (2) are provided between two adjacent second teeth (3).

4. The trimetal band saw blade according to claim 3, characterized in that, Four or six first teeth (2) are provided between two adjacent second teeth (3).

5. The tri-metal band saw blade according to claim 1, characterized in that, Both the first tooth (2) and the second tooth (3) are welded to the belt body (1).

6. The trimetal band saw blade according to claim 1, characterized in that, The first tooth (2) is provided with a lateral bending structure.

7. The trimetal band saw blade according to claim 1, characterized in that, Each of the first teeth (2) bends alternately to the left and to the right along the length of the belt body (1).

8. A method for manufacturing a trimetal band saw blade according to any one of claims 1-7, characterized in that, The following procedures are included: Step S1, Raw material preparation and pretreatment: Select spring steel as the raw material for the strip body and process the raw material for the strip body into a strip body blank plate of a preset size; select high-speed steel or alloy steel as the raw material for the teeth and process the raw material for the teeth into tooth blank strips; select cemented carbide as the raw material for the tooth tips and process the raw material for the tooth tips to produce multiple tooth tip blanks with the same specifications. Step S2, Blank welding process: The blank plate of the belt body and the blank strip of the toothed part are fixedly connected by electron beam welding or laser welding process; Step S3, blank milling: The tooth blank is milled according to the preset tooth shape. After milling, the corresponding teeth are split to form a band saw blade blank. Step S4, Blank heat treatment: The band saw blade blank is subjected to graded quenching and tempering treatment; Step S5, Welding and Grinding: The tooth tip blank is brazed to the position on the saw blade blank that lacks a tooth tip. After welding, it is ground to complete the product preparation.

9. The method for manufacturing a tri-metal band saw blade according to claim 8, characterized in that, In step S3, the preset tooth profile includes a complete tooth profile and a missing tooth profile. After the milling process is completed, the tooth portion formed according to the complete tooth profile is subjected to tooth splitting, while the missing tooth portion formed according to the missing tooth profile is not subjected to tooth splitting.

10. The method for manufacturing a tri-metal band saw blade according to claim 9, characterized in that, In step S5, the tooth tip blanks are set one-to-one with the missing tooth parts, and each tooth tip blank is welded to a corresponding missing tooth part.

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