A brazed diamond saw and a method of manufacturing the same

Abstract

The application relates to the technical field of diamond saw blades, and particularly discloses a brazed diamond saw blade and a preparation method thereof. The brazed diamond saw blade provided by the application comprises a saw blade base body (1) and a plurality of cutter head bodies (2) uniformly distributed on the periphery of the saw blade base body (1); a groove (22) is arranged on the side, away from the saw blade base body, of the cutter head body (2); the groove (22) is filled with a brazed diamond layer A (4); the periphery of the cutter head body is coated with a brazed diamond layer B (5); the brazed diamond layer A (4) comprises diamond abrasives, reinforcing bodies and alloy brazing filler materials; and the application further provides a preparation method of the brazed diamond saw blade. The brazed diamond saw blade provided by the application has excellent wear resistance and cutting performance, thereby having a long service life.

Description

Technical Field

[0001] This application relates to the technical field of diamond saw blades, specifically to a brazed diamond saw blade and its preparation method. Background Technology

[0002] Diamond is the hardest naturally occurring substance in nature. Its extremely high hardness and excellent physical and mechanical properties make diamond tools indispensable for processing various hard materials. Therefore, they are widely used in the processing of materials such as stone, ceramics, glass, concrete, PVC, and cemented carbide.

[0003] Because diamond has a high interfacial energy with common metals and alloys, it is difficult for it to be wetted by common metals or alloys, resulting in poor adhesion. Currently, the main processing methods for diamond saw blades are as follows: First, electroplating, which mechanically coats diamond abrasive between a metal coating and a substrate. However, the metal coating has weak holding force on the diamond abrasive, making it extremely easy for the diamond abrasive to detach and the coating to peel off in sheets, leading to overall saw blade failure. Therefore, the diamond saw blades produced have poor wear resistance and short service life. Second, powder metallurgy, which uses mechanical clamping force to hot-press / cold-press and embed diamond powder into a metal matrix. This produces thicker saw blades, and during operation, the diamond is prone to separating and detaching from the matrix, significantly reducing the lifespan of the diamond saw blade.

[0004] Therefore, developing a new type of diamond saw blade with good performance and long service life is the focus of research in this field. Summary of the Invention

[0005] In order to improve the cutting efficiency and wear resistance of diamond saw blades and extend their service life, this application provides a brazed diamond saw blade and its preparation method.

[0006] In a first aspect, this application provides a brazed diamond saw blade, which adopts the following technical solution:

[0007] A brazed diamond saw blade includes a saw blade substrate and a plurality of cutter heads evenly distributed around the outer periphery of the saw blade substrate; a groove is formed on the side of each cutter head away from the saw blade substrate; the groove is filled with a brazed diamond layer A; the outer periphery of each cutter head is covered with a brazed diamond layer B; the brazed diamond layer A includes diamond abrasive, a reinforcing body, and an alloy brazing filler metal.

[0008] The brazed diamond saw blade provided in this application has a cutter head body. A groove is formed on the side of the cutter head body opposite to the saw blade base. A brazed diamond layer A containing diamond abrasive is then used to fill the groove, resulting in a three-dimensional and uniform distribution of diamond abrasive within the groove. A brazed diamond layer B then covers the entire outer surface of the cutter head body, resulting in a planar distribution of diamond abrasive on the outer surface. During the use of the brazed diamond saw blade, the brazed diamond layer B covering the outer surface of the cutter head body is the first to work. When brazed diamond layer B is consumed, the brazed diamond layer A inside the cutter head body and the groove continues to work until the brazed diamond layer A inside the groove is completely consumed. Therefore, the brazed diamond saw blade provided in this application has continuous diamond abrasive involved in its operation from beginning to end, thus possessing excellent wear resistance and cutting performance, resulting in a long service life.

[0009] In this application, because the alloy brazing filler metal is in a molten, flowing state at high temperatures, it easily disrupts the three-dimensional distribution structure of diamond particles in the brazed diamond layer A. This results in uneven distribution of diamond abrasive, decreased wear resistance, and shortened service life of the brazed diamond saw blade. Therefore, the cutter head of the brazed diamond saw blade provided in this application has a groove structure, and the brazed diamond layer A filled in the groove contains a reinforcing body. This groove structure and the reinforcing body can provide excellent support for the brazed diamond layer A, effectively preventing the diamond abrasive from flowing with the molten alloy brazing filler metal, ensuring a three-dimensionally uniform distribution structure of diamond abrasive, effectively improving the wear resistance of the brazed diamond saw blade and extending its service life.

[0010] Preferably, in the brazed diamond layer A, by volume percentage, diamond abrasive accounts for 2.5-45%, alloy brazing filler metal accounts for 26-50%, and the remainder is reinforcing material.

[0011] In this application, controlling the volume percentage of each component in the brazed diamond layer A within the aforementioned range enables a stronger bond between the diamond abrasive and the alloy brazing filler metal, and between the alloy brazing filler metal and the cutting head, resulting in a more uniform and stable three-dimensional distribution structure of the diamond abrasive. Excessive addition of diamond abrasive increases production costs and reduces the sharpness of the brazed diamond saw blade; insufficient addition results in poor cutting performance. Excessive addition of alloy brazing filler metal causes the diamond abrasive and reinforcing material to flow along with the molten alloy brazing filler metal during brazing, damaging the three-dimensional structure of the brazed diamond layer A. Insufficient addition of alloy brazing filler metal prevents it from effectively brazing the diamond abrasive and reinforcing material into the grooves of the saw blade substrate, leading to powder shedding in the finished brazed diamond saw blade and consequently affecting its cutting and wear resistance. Therefore, this application controls the amount of each component added to the brazed diamond layer inside the groove within the above range, which can reduce the amount of diamond used and reduce production costs, while ensuring that the brazed diamond saw blade has good sharpness and wear resistance, thereby obtaining a brazed diamond saw blade with low cost, excellent performance and long service life.

[0012] In some embodiments, the volume percentage of the diamond abrasive can be 2.5-5%, 2.5-21%, 5-21%, 5-45%, or 21-45%.

[0013] In one specific implementation, the volume percentage of the diamond abrasive may also be 2.5%, 5%, 21%, or 45%.

[0014] In one specific implementation, the volume percentage of the alloy brazing filler metal can be 26% or 50%.

[0015] Preferably, in the brazed diamond layer A, by volume percentage, diamond abrasive is 5-21%, alloy brazing filler is 26-50%, and the remainder is reinforcing material.

[0016] This application further controls the volume percentage of diamond abrasive and alloy brazing filler metal within the above-mentioned range, resulting in a brazed diamond layer A with superior performance and a stronger brazing in the groove. The brazed diamond saw blade made using the above-mentioned brazed diamond layer A will not separate or fall off from the substrate during use, and has better cutting performance, wear resistance, and service life.

[0017] Preferably, the brazed diamond layer B is composed of diamond abrasive and alloy brazing filler metal; by volume percentage, diamond abrasive accounts for 2.5-45%, and the remainder is alloy brazing filler metal.

[0018] In this application, since the brazed diamond B covers the outer periphery of the cutter head body and is distributed in a two-dimensional planar manner, the brazed diamond layer B does not require the addition of a reinforcing body compared to the brazed diamond layer A. Furthermore, this application controls the weight proportions of diamond abrasive and alloy brazing filler metal in the brazed diamond layer B within the aforementioned range, ensuring that the brazed diamond layer B can be smoothly brazed to the outer periphery of the cutter head body. Additionally, the cutter head body covered with the brazed diamond layer B has a good shape, resulting in a brazed diamond saw blade with excellent cutting performance.

[0019] Preferably, the particle size ratio of the reinforcing body to the diamond abrasive is (0.7-1.5):1.

[0020] This application controls the particle size ratio of the reinforcing body to the diamond abrasive within the above range, which enables a more uniform distribution of each component in the brazed diamond layer and a more uniform and stable three-dimensional distribution structure of the diamond abrasive. The uniform three-dimensional distribution structure of the diamond abrasive ensures that the brazed diamond saw blade continuously and uniformly provides the necessary diamond abrasive for cutting during use, allowing the brazed diamond saw blade to maintain excellent cutting performance and wear resistance throughout the cutting process.

[0021] The diamond abrasive is selected from uncoated diamond, coated diamond, or pre-brazed diamond.

[0022] Preferably, the particle size of the diamond abrasive can be 125-850 μm.

[0023] Preferably, the alloy brazing filler metal is selected from nickel-based brazing filler metal, copper-based brazing filler metal, and silver-based brazing filler metal.

[0024] In this application, the mesh size of the alloy brazing filler metal is 100-300 mesh.

[0025] The alloy brazing filler metals used in this application are all hard brazing filler metals. By employing high-temperature brazing technology, a chemical metallurgical bond can be formed between the alloy brazing filler metal and the diamond abrasive, and between the alloy brazing filler metal and the cutter body. This improves the bonding strength between the matrix and the diamond abrasive, effectively solving the problem of diamond easily separating and falling off from the matrix in related technologies, and extending the service life of the brazed diamond saw blade. Silver-based brazing filler metals have a low melting point, can wet many metals, and have good strength, ductility, thermal conductivity, and corrosion resistance, making them very suitable for the brazed diamond saw blades provided in this application.

[0026] Preferably, the reinforcing body is selected from steel particles, brazing filler metal particles, and iron powder.

[0027] This application uses steel particles, brazing filler metal particles, or iron powder as reinforcing materials, which can provide basic mechanical support for the brazed diamond layer A, prevent the diamond abrasive in the brazed diamond layer A from flowing with the alloy brazing filler metal during the brazing process, ensure the three-dimensional structure of the brazed diamond layer A, and thus obtain a brazed diamond saw blade with good wear resistance, excellent cutting performance, and long service life.

[0028] Preferably, the melting point of the reinforcing body is greater than the melting point of the alloy solder.

[0029] The method for preparing the brazed diamond saw blade provided in this application employs high-temperature brazing technology to braze a mixture of diamond abrasive, reinforcing material, and alloy brazing filler metal into the groove of the diamond saw blade head body. The alloy brazing filler metal is the main solder used in the high-temperature brazing. During the high-temperature brazing process, when the temperature reaches the melting point of the alloy brazing filler metal, it melts first and then undergoes chemical metallurgical bonding with the diamond abrasive grains and the diamond saw blade head body, thus achieving brazing. Therefore, in the brazed diamond saw blade provided in this application, the melting point of the reinforcing material must be greater than that of the alloy brazing filler metal to prevent the reinforcing material from melting at the melting point of the alloy brazing filler metal, thereby exerting its mechanical support function and effectively preventing the destruction of the three-dimensional structure of the diamond abrasive. This maintains the uniform distribution of the diamond abrasive, improves the cutting performance and wear resistance of the brazed diamond saw blade, and extends its service life.

[0030] Preferably, the distance d between the inner wall of the groove and the adjacent side wall on the cutter head body is 0.2-2mm, and the depth of the groove is 1-20mm.

[0031] Preferably, the saw blade base is provided with a chip removal groove; the chip removal groove is disposed between two adjacent saw blade bodies.

[0032] The brazed diamond saw blade provided in this application is equipped with a chip removal groove, which can remove the chips generated during the saw blade cutting process.

[0033] Secondly, this application provides a method for preparing a brazed diamond saw blade, which adopts the following technical solution:

[0034] A method for preparing a brazed diamond saw blade includes the following steps:

[0035] Pre-processing: A groove is made on the side of the diamond saw blade head body that is away from the saw blade base;

[0036] Preparation of paste A: The diamond abrasive, the reinforcing body, the alloy brazing filler metal and the adhesive are mixed evenly to obtain paste A;

[0037] Preparation of Mixture B: The diamond abrasive and the alloy brazing filler metal are mixed evenly to obtain Mixture B;

[0038] Preparation of green blank: First, fill the groove with the paste A, and then coat the outer surface of the cutter body with the mixture B to obtain the cutter body green blank;

[0039] High-temperature vacuum brazing: The green blank is subjected to high-temperature vacuum brazing to obtain the brazed diamond saw blade.

[0040] The method for preparing the brazed diamond saw blade provided in this application employs high-temperature vacuum brazing technology. This high-temperature vacuum brazing technology enables chemical and metallurgical bonding between the diamond abrasive and the alloy brazing filler metal, and between the alloy brazing filler metal and the cutting head, thereby firmly brazing the diamond abrasive grains onto the cutting head of the diamond saw blade. This effectively solves the problem of diamond abrasive easily separating from the matrix and falling off in related technologies, and extends the service life of the diamond saw blade.

[0041] Preferably, the temperature of the high-temperature vacuum brazing is 720-1060℃.

[0042] This application achieves two key benefits by controlling the high-temperature vacuum brazing temperature in the preparation method of brazed diamond saw blades. First, it allows the active elements in the alloy brazing filler metal to fully achieve chemical metallurgical bonding with the diamond abrasive and the cutter head, thereby generating a strong bond between the diamond abrasive and the alloy brazing filler metal, and between the alloy brazing filler metal and the cutter head. This effectively solves the problem of diamond-matrix separation and detachment that occurs during the use of diamond saw blades. Second, by controlling the high-temperature vacuum brazing temperature within the aforementioned range, the reinforcing body in the brazed diamond layer A will not melt and can provide excellent support during the high-temperature vacuum brazing process, maintaining a three-dimensional and uniform distribution structure of the diamond abrasive. Ultimately, this results in brazed diamond saw blades with excellent wear resistance and a long service life. The preparation method of brazed diamond saw blades provided by this application also has the advantages of low manufacturing cost, simple and reliable process, convenient operation, and easy automation control, making it suitable for large-scale industrial production.

[0043] In actual production and use, the saw blade base and the cutter head of a brazed diamond saw blade can be formed as a single piece or as separate pieces. The processing method for the brazed diamond saw blade is determined by comprehensively considering the ease of base machining and the application conditions.

[0044] The method for preparing a one-piece brazed diamond saw blade includes the following steps:

[0045] Pre-processing: The saw blade base and the cutter head body are integrally machined to obtain a diamond saw blade; then a groove is made on the side of the diamond saw blade cutter head body away from the saw blade base.

[0046] Preparation of paste A: The diamond abrasive, the reinforcing body, the alloy brazing filler metal and the adhesive are mixed evenly to obtain paste A;

[0047] Preparation of Mixture B: The diamond abrasive and the alloy brazing filler metal are mixed evenly to obtain Mixture B;

[0048] Preparation of diamond saw blade blank: First, fill the groove with the paste A, and then coat the outer surface of the blade body with the mixture B to obtain the diamond saw blade blank;

[0049] High-temperature vacuum brazing: The diamond saw blade blank is subjected to high-temperature vacuum brazing at 720-1060℃ to obtain the brazed diamond saw blade.

[0050] The method for preparing a brazed diamond saw blade by split machining includes the following steps:

[0051] Pre-processing: The saw blade base and the cutter head body are separately processed to obtain the saw blade base and the cutter head body; then a groove is made on the side of the cutter head body away from the saw blade base;

[0052] Preparation of paste A: The diamond abrasive, the reinforcing body, the alloy brazing filler metal and the adhesive are mixed evenly to obtain paste A;

[0053] Preparation of Mixture B: The diamond abrasive and the alloy brazing filler metal are mixed evenly to obtain Mixture B;

[0054] Preparation of cutter head blank: First, fill the groove with the paste A, and then coat the outer surface of the cutter head body with the mixture B to obtain the cutter head body blank;

[0055] High-temperature vacuum brazing: The cutter head body blank is subjected to high-temperature vacuum brazing at 720-1060℃ to obtain the cutter head; then the cutter head is welded to the saw blade substrate to obtain the brazed diamond saw blade.

[0056] In summary, this application has the following beneficial effects:

[0057] 1. The brazed diamond saw blade provided in this application has a groove on the side of the cutter head away from the saw blade substrate. This groove is filled with a brazed diamond layer A containing diamond abrasive. When cutting with this brazed diamond saw blade, the saw blade substrate will not separate or fall off. Furthermore, throughout the cutting process, the brazed diamond layer A can continuously provide diamond abrasive grains for the cutting work. Therefore, the brazed diamond saw blade provided in this application has the advantages of good cutting performance, excellent wear resistance, and long service life.

[0058] 2. The brazed diamond layer encased in the groove of this application contains a reinforcing body. The reinforcing body and the sidewall of the groove can provide skeletal support for the diamond abrasive in the brazed diamond layer A, so that the diamond abrasive maintains its three-dimensional distribution structure during the vacuum high-temperature brazing process and is evenly distributed in the brazed diamond layer A. The brazed diamond saw blade made using the above-mentioned brazed diamond layer A has excellent cutting performance and a long service life.

[0059] 3. This application further controls the addition amount of each component in the brazed diamond layer A within the following range: by volume percentage, diamond abrasive 5-21%, alloy brazing filler 26-50%, and the balance is reinforcing material; the obtained brazed diamond saw blade is tested on C45 concrete, and its cutting efficiency is ≥1.3m / min, and the saw tooth unit height life is >27m / mm.

[0060] 4. In this application, the preparation method of the brazed diamond saw blade adopts high-temperature vacuum brazing technology, and the temperature in the high-temperature brazing technology is controlled within the range of 720-1060℃. This enables chemical metallurgical bonding between the diamond abrasive and the alloy brazing filler metal, and between the alloy brazing filler metal and the cutter head body, thereby firmly brazing the diamond abrasive grains onto the cutter head body of the diamond saw blade. This effectively solves the problem of diamond abrasive easily separating from the matrix and falling off in related technologies, and effectively extends the service life of the diamond saw blade.

[0061] 5. The method for preparing brazed diamond saw blades provided in this application also has the advantages of low manufacturing cost, simple and reliable process, convenient operation and easy to realize automated control, and is therefore suitable for large-scale industrial production. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the brazed diamond saw blade structure provided in this application.

[0063] Figure 2 This is a schematic diagram of the brazed diamond saw blade head structure provided in this application.

[0064] Figure 3 This is a cross-sectional view AA of the brazed diamond saw blade head provided in this application.

[0065] Figure 4 This is a cross-sectional view of the brazed diamond saw blade tip BB provided in this application.

[0066] Figure 5 This is a schematic diagram of the cutter head structure of the brazed diamond saw blade provided in this application.

[0067] Figure 6 This is a schematic diagram of the saw blade substrate structure of the brazed diamond saw blade provided in this application.

[0068] Figure Labels

[0069] 1. Saw blade base; 2. Cutter head body; 22. Groove; 3. Chip removal groove; 4. Brazed diamond layer A (three-dimensional diamond distribution layer); 5. Brazed diamond layer B (two-dimensional diamond distribution layer). Detailed Implementation

[0070] This application provides a brazed diamond saw blade, comprising a saw blade substrate 1 and a plurality of cutter heads 2 evenly distributed on the outer periphery of the saw blade substrate 1. A groove 22 is formed on the side of the cutter head 2 facing away from the saw blade substrate, and the groove 22 is filled with a brazed diamond layer A4. A brazed diamond layer B5 covers the outer periphery of the cutter head 2. The brazed diamond layer A4 comprises diamond abrasive, a reinforcing body, and an alloy brazing filler metal. The distance d between the inner wall of the groove 22 and the adjacent sidewall of the cutter head 2 is 0.2-2 mm, and the depth of the groove 22 is 1-20 mm. A chip removal groove 3 is formed on the saw blade substrate 1, and the chip removal groove 3 is disposed between two adjacent cutter heads 2.

[0071] In the brazed diamond layer A4, by volume percentage, diamond abrasive comprises 2.5-45%, alloy brazing filler metal comprises 26-50%, and the balance is reinforcing material; further, in the brazed diamond layer A4, by volume percentage, diamond abrasive comprises 5-21%, alloy brazing filler metal comprises 26-50%, and the balance is reinforcing material. The brazed diamond layer B5 comprises diamond abrasive and alloy brazing filler metal; by volume percentage, diamond abrasive comprises 2.5-45%, and the balance is alloy brazing filler metal. The particle size ratio of the reinforcing material to the diamond abrasive is (0.7-1.5):1; the melting point of the reinforcing material is greater than the melting point of the alloy brazing filler metal.

[0072] The preparation method of the above-mentioned brazed diamond saw blade is as follows:

[0073] (1) Pre-processing: A groove 22 is made on the side of the diamond saw blade head body 2 away from the saw blade base body 1;

[0074] (2) Preparation of paste A: The diamond abrasive, the reinforcing body, the alloy brazing filler metal and the adhesive are mixed evenly to obtain paste A;

[0075] (3) Preparation of mixture B: The diamond abrasive and the alloy brazing filler metal are mixed evenly to obtain mixture B;

[0076] (4) Preparation of green blank: First, fill the groove 22 with the paste A, and then evenly coat the mixture B on the outer surface of the cutter head body 2 to obtain the green blank;

[0077] (5) High-temperature vacuum brazing: The green blank is subjected to high-temperature vacuum brazing to obtain the brazed diamond saw blade.

[0078] In specific embodiments of this application, the brazed diamond layer A is formed by brazing "paste A"; the brazed diamond layer B is formed by brazing "mixture B"; the diamond abrasive is coated diamond with a particle size of 425-600μm; the alloy brazing filler metal is selected from nickel-based or silver-based brazing filler metal; the reinforcing body is selected from Q235 steel fragments or nickel-based brazing filler metal; the binder can be a water-based adhesive or a resin-based adhesive, and any adhesive that can achieve the bonding effect can be used in this application; all raw materials and reagents used in this application are commercially available.

[0079] The present application will be further described in detail below with reference to the accompanying drawings, embodiments, comparative examples, and performance testing tests.

[0080] Example

[0081] Examples 1-6

[0082] Examples 1-6 each provide a brazed diamond saw blade.

[0083] The difference in the above embodiments is that the amount of each component added to the brazed diamond layer A and the brazed diamond layer B in the brazed diamond saw blade is shown in Table 1.

[0084] The reinforcing material is Q235 steel fragments (particle size 300-900μm, melting point 1493℃), and the alloy brazing filler metal is nickel-based brazing filler metal (melting point 1000℃).

[0085] The method for preparing the brazed diamond saw blade provided in Example 3 specifically includes the following steps:

[0086] (1) Pre-processing: The saw blade base 1 and the cutter head body 2 are processed separately to obtain the saw blade base 1 and the cutter head body 2 (the cutter head body is as follows). Figure 5 (as shown); then a groove 22 is made on the side of the cutter head body 2 away from the saw blade base 1; the distance d between the inner wall of the groove 22 and the adjacent side wall on the cutter head body 2 is 1mm, and the depth of the groove 22 is 20mm; a chip removal groove 3 is provided on the saw blade base 1; the chip removal groove 3 is located between two adjacent cutter head bodies 2.

[0087] (2) Preparation of paste A: To prepare 1000cm 3 For paste A, weigh 210 cm of diamond abrasive. 3 (21% by volume), reinforced body 290cm 3 (29% by volume) and 500cm of alloy brazing filler metal 3 Mix thoroughly (50% by volume) and add 1000g of adhesive to obtain paste A.

[0088] (3) Preparation of Mixture B: To prepare 1000cm 3For mixture B, weigh 210cm of diamond abrasive. 3 (21% by volume) and 790cm alloy brazing filler metal 3 Mix thoroughly (79% by volume) to obtain mixture B.

[0089] (4) Preparation of diamond cutter head blank: First, fill groove 22 with paste A, and then coat the outer surface of the cutter head body with mixture B to obtain diamond cutter head blank;

[0090] (5) High-temperature vacuum brazing: The diamond tool blank is brazed at a temperature of 1060℃ and a vacuum degree of 1.0×10⁻⁶. -2 High-temperature vacuum brazing is performed under Pa conditions, with a holding time of 10 min. After the holding time is completed, the blade is cooled to room temperature at a cooling rate of 10℃ / min to obtain the blade head body. Then, the blade head body is welded to the saw blade base to obtain a brazed diamond saw blade with a size of 350mm.

[0091] Table 1. Components and dosages of brazed diamond layer A and brazed diamond layer B in Examples 1-6.

[0092]

[0093] Example 7

[0094] Example 7 provides a brazed diamond saw blade.

[0095] The aforementioned brazed diamond saw blade is manufactured using a one-piece machining process. The reinforcing body is a nickel-based brazing filler metal (particle size 300-900μm, melting point 1000℃), and the alloy brazing filler metal is a silver-based brazing filler metal (melting point 820℃).

[0096] The preparation method of the brazed diamond saw blade provided in Example 7 includes the following specific steps:

[0097] (1) Pre-processing: The saw blade base 1 and the cutter head body 2 are integrally machined to obtain a diamond saw blade (e.g., ...). Figure 6 (as shown); then a groove 22 is made on the side of the diamond saw blade head body 2 away from the saw blade base 1; the distance d between the inner wall of the groove 22 and the adjacent side wall on the head body 2 is 0.2mm, and the depth of the groove 22 is 10mm; a chip removal groove 3 is provided on the saw blade base 1; the chip removal groove 3 is located between two adjacent head bodies 2.

[0098] (2) Preparation of paste A: To prepare 1000cm 3 For paste A, weigh 210 cm of diamond abrasive. 3 , reinforced body 290cm 3 500cm of alloy brazing filler metal 3Mix thoroughly and add 1000g of adhesive to obtain paste A.

[0099] (3) Preparation of Mixture B: To prepare 1000cm 3 For mixture B, weigh 210cm of diamond abrasive. 3 790cm of alloy brazing filler metal 3 Mix thoroughly to obtain mixture B.

[0100] (4) Preparation of diamond saw blade blank: First, fill the groove 22 with the paste A, and then coat the mixture B on the outer surface of the blade body to obtain the diamond saw blade blank;

[0101] (5) High-temperature vacuum brazing: The diamond saw blade blank is brazed at a temperature of 900℃ and a vacuum degree of 1.0×10⁻⁶. -2 High-temperature vacuum brazing is performed under Pa conditions, with a holding time of 10 min. After the holding time is completed, the material is cooled to room temperature at a cooling rate of 10℃ / min to obtain a brazed diamond saw blade with a size of 180 mm.

[0102] Comparative Example

[0103] Comparative Example 1

[0104] Comparative Example 1 provides a brazed diamond saw blade.

[0105] The difference between the above comparative example and Example 3 is that the brazed diamond layer A and brazed diamond layer B of the brazed diamond saw blade provided in Comparative Example 1 have the same composition. The composition of both brazed diamond layer A and brazed diamond layer B is: 210cm diamond abrasive. 3 790cm of alloy brazing filler metal 3 A mixture.

[0106] Comparative Example 2

[0107] Comparative Example 2 provides a brazed diamond saw blade.

[0108] The preparation method of this brazed diamond saw blade is as follows:

[0109] (1) Pre-processing: The saw blade base 1 and the cutter head 2 are processed separately, and the cutter head 2 is not provided with groove 22.

[0110] (2) Preparation of Mixture B: 210 cm of diamond-coated material... 3 790cm of nickel-based solder 3 Mix thoroughly to obtain mixture B.

[0111] (3) Preparation of diamond cutter head blank: The mixture B is coated on the outer surface of the cutter head body to obtain diamond cutter head blank;

[0112] (4) High-temperature vacuum brazing: The diamond tool blank is brazed at a temperature of 1060℃ and a vacuum degree of 1.0×10⁻⁶. -2 High-temperature vacuum brazing is performed under Pa conditions, with a holding time of 10 min. After the holding time is completed, the blade is cooled to room temperature at a cooling rate of 10℃ / min to obtain the blade head body. Then, the blade head body is welded to the saw blade base to obtain a brazed diamond saw blade with a size of 350mm.

[0113] Comparative Example 3

[0114] Comparative Example 3 provides a brazed diamond saw blade.

[0115] The preparation method of this brazed diamond saw blade is as follows:

[0116] (1) Pre-processing: The saw blade base 1 and the cutter head 2 are integrally processed and formed, and the cutter head 2 is not provided with groove 22.

[0117] (2) Preparation of Mixture B: 210 cm of diamond-coated material... 3 Silver-based solder 790cm 3 Mix thoroughly to obtain mixture B.

[0118] (3) Preparation of diamond saw blade blank: The mixture B is coated on the outer surface of the cutter head body 2 to obtain a diamond saw blade blank.

[0119] (4) High-temperature vacuum brazing: The diamond saw blade blank is brazed at a temperature of 900℃ and a vacuum degree of 1.0×10⁻⁶. -2 High-temperature vacuum brazing is performed under Pa conditions, with a holding time of 10 min. After the holding time is completed, the material is cooled to room temperature at a cooling rate of 10℃ / min to obtain a brazed diamond saw blade with a size of 180 mm.

[0120] Comparative Example 4

[0121] Comparative Example 4 provides a brazed diamond saw blade.

[0122] The difference between the above comparative example and Example 7 is that the vacuum brazing temperature in the preparation method of the brazed diamond saw blade is 600°C.

[0123] Cutting performance test

[0124] Cutting performance tests were conducted on the brazed diamond saw blades provided in Examples 1-7 and Comparative Examples 1-4. The cutting efficiency and tooth life per unit height of the brazed diamond saw blades were calculated, and the results are shown in Table 3.

[0125] (1) The cutting test method is as follows: install the brazed diamond saw blade on the cutting machine and use concrete or tiles to test the cutting performance.

[0126] The brazed diamond saw blades obtained in Examples 1-6 and Comparative Examples 1-2 have a size of 350mm. Therefore, C45 concrete was used for the cutting performance test, and the cutting depth was 50mm.

[0127] Example 7: The brazed diamond saw blade obtained in Comparative Examples 3-4 has a size of 180mm, which makes it difficult to cut concrete with a depth of 50mm. Therefore, a 10mm thick ceramic tile was used for testing.

[0128] (2) Cutting efficiency refers to the length of concrete / tile cut by the saw blade per unit time, which measures the sharpness of the saw blade; saw tooth unit height life refers to the length of concrete / tile cut by the saw blade per unit height under specified conditions, which measures the service life of the saw blade. For specific methods, please refer to GB / T 41356-2022.

[0129] Table 3 Performance test results of brazed diamond saw blades obtained in Examples 1-7 and Comparative Examples 1-4

[0130]

[0131]

[0132] According to the test results of Examples 1-6 and Comparative Example 2, when the brazed diamond saw blades obtained in Examples 1-6 and Comparative Example 2 were used to cut concrete with a depth of 50mm, the saw blades obtained in Examples 1-6 had a saw tooth lifespan of 23-43 m / mm per unit height, thus enabling them to cut 460-860 m of concrete with a depth of 50mm; while the brazed diamond saw blade obtained in Comparative Example 2 could only cut 80 m of concrete with a depth of 50mm. According to the test results of Examples 7 and Comparative Example 3, when the brazed diamond saw blades obtained in Examples 7 and Comparative Example 3 were used to cut ceramic tiles with a thickness of 10mm, the brazed diamond saw blade obtained in Example 7 had a saw tooth lifespan of 125 m / mm per unit height, thus enabling it to cut 1250 m of concrete with a thickness of 10mm; while the brazed diamond saw blade obtained in Comparative Example 3 could only cut 50 m of ceramic tiles with a thickness of 10mm.

[0133] It can be seen that the service life of the brazed diamond saw blades obtained in Examples 1-6 is significantly longer than that of the brazed diamond saw blade obtained in Comparative Example 2; the service life of the brazed diamond saw blade obtained in Example 7 is significantly longer than that of the brazed diamond saw blade obtained in Comparative Example 3. This is because the cutter body of the brazed diamond saw blades obtained in Comparative Examples 2 and 3 does not have a groove, and only a brazed diamond layer B is coated on the outer surface of the cutter body. When the brazed diamond layer B coated on the outer surface of the cutter body is consumed, the brazed diamond saw blade can no longer cut, resulting in a short service life. However, the brazed diamond saw blades provided in Examples 1-7 have a groove at the top, and the groove is filled with diamond abrasive and the cutter body is coated with diamond abrasive. This makes the diamond abrasive inside the groove present a three-dimensional and uniform distribution, and the diamond abrasive coated on the outer periphery of the cutter body presents a planar distribution structure. This structure can give the brazed diamond saw blade a longer service life and ensure that the brazed diamond saw blade has excellent cutting efficiency.

[0134] According to the test results of Examples 1-6 and Comparative Example 1, during the preparation of the brazed diamond saw blade in Comparative Example 1, the diamond abrasive flowed along with the alloy brazing filler metal, resulting in an incompletely formed brazed diamond saw blade that could not cut. Therefore, this demonstrates that when a reinforcing agent is added to the brazed diamond layer A, the diamond abrasive grains maintain a complete, stable, and uniformly distributed three-dimensional structure, thereby enabling the brazed diamond saw blade to maintain excellent cutting efficiency and a long service life during use.

[0135] According to the test results of Examples 1-6, the cutting efficiency of the brazed diamond saw blades obtained in Examples 1-6 is 1.09-1.63 m / min, and the saw tooth life per unit height is 23.08-43.04 m / mm. This indicates that the composition of the brazed diamond layer A4 in this application is controlled within the following range: by volume percentage, diamond abrasive 2.5-45%, alloy brazing filler 26-50%, and the balance is reinforcing material, which can obtain brazed diamond saw blades with excellent cutting performance and long service life. Further comparison shows that when diamond abrasive is 5-21%, alloy brazing filler 26-50%, and the balance is reinforcing material, the cutting efficiency of the obtained brazed diamond saw blade is 1.3-1.63 m / min, and the saw tooth life per unit height is 27.27-33.33 m / mm.

[0136] Based on the test results of Examples 1-6 and Example 7, it can be seen that both silver-based and nickel-based brazing filler metals can be used as alloy brazing filler metals in this application, resulting in brazed diamond saw blades with good cutting efficiency and long service life. The brazed diamond saw blades with a diameter of 350mm obtained in Examples 1-6 have a cutting efficiency of 1.09-1.63 m / min and a tooth lifespan per unit height of 23.08-43.04 m / mm; the brazed diamond saw blade with a diameter of 180mm obtained in Example 7 has a cutting efficiency of 2.11 m / min and a tooth lifespan per unit height of 125 m / mm. This indicates that both integral forming and split forming methods can be used to prepare brazed diamond saw blades in this application, and the obtained brazed diamond saw blades have high cutting efficiency and long service life.

[0137] According to the test results of Example 7 and Comparative Example 4, when the vacuum brazing temperature of Comparative Example 4 is 600℃, the brazing effect of the brazed diamond saw blade is poor, and it is difficult to achieve chemical metallurgical bonding between the brazed diamond layer and the cutter head body; while when the vacuum brazing temperature of Example 7 is 900℃, the brazed diamond layer and the cutter head body are firmly bonded, and the obtained brazed diamond saw blade has good stability during operation, and the brazed diamond layer will not fall off, so its service life is long.

[0138] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A brazed diamond saw blade, characterized in that, The saw blade includes a saw blade substrate (1) and multiple cutter heads (2) evenly distributed around the outer periphery of the saw blade substrate (1); a groove (22) is provided on the side of the cutter head (2) away from the saw blade substrate (1); the groove (22) is filled with a brazed diamond layer A (4); the outer periphery of the cutter head is covered with a brazed diamond layer B (5); the brazed diamond layer A (4) includes diamond abrasive, reinforcing body and alloy brazing filler metal; The brazed diamond layer A (4) comprises, by volume percentage, 2.5-45% diamond abrasive, 26-50% alloy brazing filler metal, and the remainder being reinforcing material.

2. The brazed diamond saw blade according to claim 1, characterized in that, The brazed diamond layer A (4) comprises, by volume percentage, 5-21% diamond abrasive, 26-50% alloy brazing filler metal, and the remainder being reinforcing material.

3. The brazed diamond saw blade according to claim 1, characterized in that, The brazed diamond layer B (5) consists of diamond abrasive and alloy brazing filler metal; by volume percentage, diamond abrasive accounts for 2.5-45%, and the remainder is alloy brazing filler metal.

4. The brazed diamond saw blade according to any one of claims 1-2, characterized in that, The particle size ratio of the reinforcing body to the diamond abrasive is (0.7-1.5):

1.

5. The brazed diamond saw blade according to any one of claims 1-2, characterized in that, The melting point of the reinforcing body is greater than that of the alloy brazing filler metal.

6. The brazed diamond saw blade according to claim 1, characterized in that, The distance d between the inner wall of the groove (22) and the adjacent side wall of the cutter head body (2) is 0.2-2mm, and the depth of the groove (22) is 1-20mm.

7. The brazed diamond saw blade according to claim 1, characterized in that, The saw blade base (1) is provided with a chip removal groove (3); the chip removal groove (3) is located between two adjacent cutter heads (2).

8. The method for preparing a brazed diamond saw blade as described in any one of claims 1-7, characterized in that, Includes the following steps: Pre-processing: A groove (22) is made on the side of the diamond saw blade head body (2) away from the saw blade base (1). Preparation of paste A: The diamond abrasive, the reinforcing body, the alloy brazing filler metal and the adhesive are mixed evenly to obtain paste A; Preparation of Mixture B: The diamond abrasive and the alloy brazing filler metal are mixed evenly to obtain Mixture B; Preparation of green blank: First, fill the groove (22) with the paste A, and then uniformly coat the mixture B on the outer surface of the cutter head body (2) to obtain the green blank; High-temperature vacuum brazing: The green blank is subjected to high-temperature vacuum brazing to obtain the brazed diamond saw blade.

9. The method for preparing a brazed diamond saw blade according to claim 8, characterized in that, The temperature for the high-temperature vacuum brazing is 720-1060℃.

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