A butterfly tooth-shaped diamond tool bit and a preparation method thereof

Abstract

The application discloses a butterfly tooth-shaped diamond tool bit, which is sintered by multiple layers of cold compacts, and the cold compacts are formed by matrix powder and diamonds, and the diamonds are orderly arranged on the cold compacts; the matrix powder is prepared from 15-35% of pre-alloyed powder CuSn, 25-45% of pre-alloyed powder FeCuCo and the balance of pre-alloyed powder FeCuP in terms of mass fraction; and the butterfly tooth-shaped diamond tool bit is prepared by using the pre-alloyed powder with a specific proportion and the orderly arranged diamonds, the matrix powder is all prepared from the pre-alloyed powder, the problems of low alloying degree, segregation and under-sintering caused by the mixing of elemental powders are avoided, the uniformity and compactness of the matrix are improved, and thus the rapid wear, the fire phenomenon and the softening of the matrix in the dry cutting process are reduced; and the orderly arrangement of the diamonds further improves the cutting efficiency and self-sharpening property of the tool bit.

Description

Technical Field

[0001] This invention relates to the field of diamond cutting tool technology, specifically to a butterfly-tooth shaped diamond cutting tool and its preparation method. Background Technology

[0002] Diamond saw blades, as highly efficient cutting tools, rely on diamond cutting heads as their core component. These heads are typically made by mixing metal matrix powder with diamonds, followed by cold pressing and hot pressing sintering. Currently, there are two main methods for arranging the diamonds in the cutting head:

[0003] The first method involves random, unordered diamond arrangement. While simple, this method easily leads to uneven diamond distribution within the matrix, resulting in concentration differences within the same cutting head. During cutting, the diamonds experience varying degrees of impact and wear. In areas of high concentration, individual diamonds bear less force and are difficult to detach, preventing the emergence of new sharp edges (i.e., poor self-sharpening), thus dulling the cutting head. Conversely, in areas of low concentration, individual diamonds bear excessive loads, easily breaking or detaching prematurely, causing rapid wear of the cutting head. This unevenness severely impacts cutting efficiency and cutting head lifespan.

[0004] The second method is ordered array arrangement. This method solves the problem of uneven distribution by arranging diamonds according to a preset pattern, and performance can be optimized by adjusting the spacing. Ordered arrangement ensures a constant number of diamonds working on the cutting surface, resulting in uniform force distribution. However, its inherent uniformity also brings new technical problems: because the diamond concentration is consistent across all areas, the overall wear of the cutting head is synchronized, making it impossible to form a sharp "serrated" cutting surface. This leads to poor initial sharpness and difficulty in cutting materials such as stone and reinforced concrete, and the overall cutting performance, especially in terms of efficiency, still needs improvement. Summary of the Invention

[0005] In view of the shortcomings of existing diamond cutting tips, this invention provides a butterfly-tooth diamond cutting tip that retains the advantages of orderly arrangement, long life and stable performance, while effectively improving cutting sharpness and efficiency.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a butterfly-tooth shaped diamond cutting tip, which is formed by sintering multiple layers of cold-pressed blanks, wherein the cold-pressed blanks are made of matrix powder and diamonds, and the diamonds are arranged in an orderly manner on the cold-pressed blanks; the matrix powders include, by mass fraction: 15-35% pre-alloyed powder CuSn, 25-45% pre-alloyed powder FeCuCo, and the balance pre-alloyed powder FeCuP.

[0007] Furthermore, the specific composition ratio of the pre-alloyed CuSn powder is 70-90% Cu and 10-30% Sn.

[0008] Furthermore, the specific composition ratio of the pre-alloyed powder FeCuCo is 30-35% Fe, 25-30% Cu and 40-45% Co.

[0009] Furthermore, the specific composition ratio of the pre-alloyed powder FeCuP is 65-75% Fe, 20-25% Cu and 5-15% P.

[0010] Furthermore, the cold-pressed blank contains multiple rows of diamonds, with any one row of diamonds arranged vertically along the cutting edge direction, and adjacent rows arranged in a staggered manner.

[0011] Furthermore, the diamond has a particle size of 30-40 mesh.

[0012] Furthermore, the butterfly-shaped diamond cutting head includes a welded end connected to a metal substrate and a cutting edge end for cutting. A groove structure is pressed and formed on both sides of the cutting edge from the welded end to the cutting edge end, so that the cutting head forms a grooved area and a non-grooved area. The diamond concentration in the grooved area is greater than the diamond concentration in the non-grooved area.

[0013] Furthermore, the diamond concentration difference between the grooved region and the non-grooved region is 25-35%.

[0014] Furthermore, the butterfly-shaped diamond cutter head includes a first cutting surface and a second cutting surface arranged opposite to each other. The first cutting surface includes a first grooved area and a first non-grooved area, and the second cutting surface includes a second grooved area and a second non-grooved area. There are multiple first grooved areas, which are spaced apart, and there are multiple second grooved areas, which are spaced apart, so that the cutting surface forms a sawtooth undulating structure.

[0015] On the other hand, a method for preparing a butterfly-tooth-shaped diamond cutting tip includes the following steps:

[0016] S1: Weigh each pre-alloyed powder according to the proportion to prepare matrix powder;

[0017] S2: Diamonds are arranged vertically and staggered on the surface of matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder and form a cold-pressed blank.

[0018] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads;

[0019] S4: A groove structure is formed by pressing the first and second cutting surfaces to obtain the butterfly-tooth diamond cutter head.

[0020] The butterfly-tooth diamond cutting tip of this invention has the following beneficial effects: The butterfly-tooth diamond cutting tip utilizes a specific ratio of pre-alloyed powder, orderly arranged diamonds, and a grooved structure in synergy. The matrix powder is entirely pre-alloyed, avoiding the problems of low alloying degree, segregation, and under-burning caused by mixing elemental powders. This improves the uniformity and density of the matrix, thereby reducing excessive wear, sparking, and matrix softening during dry cutting. The orderly staggered arrangement of diamonds further enhances cutting efficiency and self-sharpening. The grooved structure creates a "fast and slow" wear pattern for the diamond cutting tip, improving sharpness and lifespan, perfectly resolving the contradiction between poor sharpness of orderly arranged cutting tips and uneven lifespan of disordered arranged cutting tips. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the butterfly-shaped diamond cutting tip in this invention.

[0022] Figure 2 This is a schematic diagram of the structure of the first cutting surface in this invention.

[0023] Figure 3 This is a schematic diagram of the saw blade structure in this invention.

[0024] Reference numerals: cutter head 100, circular metal base 200, saw blade 300, welding end 101, cutting edge end 102, first cutting surface 103, second cutting surface 104, first side surface 105, second side surface 106, diamond 1, groove area 2, first groove area 21, first V-shaped groove 211, second V-shaped groove 212, triangular groove 213, non-grooving area 3, first non-grooving area 31, clearance groove 4, elongated groove 41, circular groove 42. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Please see the appendix Figure 1-3 This invention provides a butterfly-shaped diamond cutting tip 100, which is formed by sintering multiple layers of cold-pressed blanks. The cold-pressed blanks are made of matrix powder and diamond 1, wherein the diamond 1 is arranged in an orderly manner on the cold-pressed blanks. The matrix powder comprises, by mass fraction: 15-35% pre-alloyed powder CuSn, 25-45% pre-alloyed powder FeCuCo, and the balance pre-alloyed powder FeCuP. Preferably, in this invention, the diamond 1 is diamond particles.

[0027] The butterfly-shaped diamond cutting head 100 of this invention employs a specific ratio of pre-alloyed powder (CuSn, FeCuCo, FeCuP) and diamond 1 arranged in an orderly manner. The matrix powder is entirely composed of pre-alloyed powder, which avoids the problems of low alloying degree, segregation, and under-burning caused by mixing elemental powders. This improves the uniformity and density of the matrix, thereby reducing excessive wear, sparking, and matrix softening during the cutting process. The orderly staggered arrangement of diamond 1 further enhances the cutting efficiency and self-sharpening of the cutting head 100.

[0028] In this invention, the pre-alloyed CuSn powder has a specific composition ratio of 70-90% Cu and 10-30% Sn. The addition of CuSn pre-alloyed powder can effectively improve the densification of the matrix powder, act as a low-melting-point liquid phase lubricant under high temperature, promote the sintering process, and reduce the hardness of the matrix, so that the wear degree of the matrix matches the diamond's cutting speed, thereby improving self-sharpening and cutting efficiency.

[0029] In this invention, the specific composition ratio of the pre-alloyed powder FeCuCo is 30-35% Fe, 25-30% Cu, and 40-45% Co. The FeCuCo pre-alloyed powder composition significantly improves the red hardness (high-temperature hardness) of the matrix and enhances the matrix's holding power for diamond. The role of Co is to reduce the wetting angle between the matrix and diamond, strengthen the bonding strength, prevent premature diamond detachment, and ensure that the cutting head 100 maintains stable performance at high cutting temperatures.

[0030] In this invention, the specific composition ratio of the pre-alloyed powder FeCuP is 65-75% Fe, 20-25% Cu, and 5-15% P. In the FeCuP pre-alloyed powder, the P element can lower the sintering temperature of the matrix and reduce energy consumption; the Cu element improves the plasticity of the matrix and avoids brittleness; at the same time, this combination further optimizes the wear resistance and sintering density of the matrix, enabling the cutter head 100 to adapt to highly abrasive cutting environments.

[0031] In this invention, the cold-pressed blank contains multiple rows of diamonds 1, with any row of diamonds 1 arranged vertically along the cutting edge direction and adjacent rows staggered. This orderly staggered arrangement significantly increases the number of diamonds 1 participating in a single cut and forms a multi-point, interlaced cutting trajectory, thereby greatly improving the overall sharpness and cutting efficiency of the cutter head 100. At the same time, this orderly structure ensures that the outer dull diamonds 1 can fall off in time, allowing the next layer of sharp diamonds 1 to emerge in time, achieving an ideal and controllable diamond emergence state.

[0032] In this invention, the diamond particles have a mesh size of 30-40, exhibiting excellent cutting ability and self-sharpening properties. They are suitable for cutting highly abrasive materials such as granite and reinforced concrete, effectively balancing cutting efficiency and diamond holding force, preventing premature detachment or wear. Preferably, the concentration of diamond 1 in the butterfly-tooth diamond cutter head 100 is 15-25%.

[0033] In this invention, the butterfly-shaped diamond cutting head 100 includes a welding end 101 connected to a metal substrate and a cutting edge end 102 for cutting. A groove structure is pressed and formed on both sides of the cutting edge from the welding end 101 to the cutting edge end 102, so that the cutting head forms a grooved region 2 and a non-grooved region 3. The diamond concentration in the grooved region 2 is greater than the diamond concentration in the non-grooved region 3. The butterfly-tooth diamond cutting head 100 is physically pressed to form butterfly-tooth-shaped cutting surfaces on both sides; its appearance is more attractive to customers and the market than that of flat teeth. During cutting, the non-grooved area 3 (low-concentration area of ​​diamond 1) wears quickly, causing diamond 1 to emerge rapidly, providing excellent initial sharpness and self-sharpening properties; while the grooved area 2 (high-concentration area of ​​diamond 1) wears more slowly, with strong diamond holding force, acting as a skeleton to support the cutting head 100, ensuring the service life and cutting stability of the cutting head 100. This "fast and slow" wear pattern forms a dynamic complement, perfectly solving the contradiction between the poor sharpness of the orderly arranged cutting head 100 and the uneven service life of the disordered arranged cutting head 100.

[0034] In this invention, the diamond concentration difference between the grooved region 2 and the non-grooved region 3 is 25-35%, which is the optimal range determined by numerous experiments. This ensures an optimal balance between sharpness and lifespan. If the concentration difference is too small, the effect is not obvious; if the concentration difference is too large, it may lead to premature depletion of diamond in the low-concentration region or difficulty in sharpening the blade in the high-concentration region. Preferably, the diamond concentration difference between the grooved region 2 and the non-grooved region 3 is 30%. A 30% concentration difference is the optimal choice for achieving a butterfly-tooth undulating cutting edge and ensuring that the two regions can effectively and persistently complement each other.

[0035] In this invention, the diamonds 1 are arranged vertically from the welding end 101 to the cutting edge end 102, and adjacent rows of diamonds 1 are staggered. This significantly increases the number of diamonds 1 participating in a single cut and forms a multi-point, interlaced cutting trajectory, thereby greatly improving the overall sharpness and cutting efficiency of the cutting head 100. At the same time, this orderly structure ensures that the outer layer of dull diamonds 1 can fall off in time, allowing the next layer of sharp diamonds 1 to emerge in time, achieving an ideal and controllable diamond emergence state.

[0036] In this invention, the butterfly-tooth diamond cutter head 100 includes a first cutting surface 103 and a second cutting surface 104 arranged opposite to each other. The first cutting surface 103 includes a first grooved area 21 and a first non-grooved area 31, and the second cutting surface 104 includes a second grooved area and a second non-grooved area. There are multiple first grooved areas 21 spaced apart, and multiple second grooved areas spaced apart, forming a sawtooth-like undulating structure on both cutting surfaces. Both the first cutting surface 103 and the second cutting surface 104 have multiple spaced grooved areas 21, thus forming a sawtooth-like undulating structure. This ensures that during cutting, the cutter head 100 makes intermittent, wave-like contact with the workpiece, rather than continuous contact across the entire surface, effectively reducing the contact area and frictional resistance, thereby reducing power consumption and heat accumulation during cutting, and also facilitating chip removal.

[0037] In this invention, the first cutting surface 103 to the second cutting surface 104 are along the thickness direction of the cutter head 100. Each first groove region 21 has a corresponding second groove region of the same shape along the thickness direction. The groove regions 2 on the two cutting surfaces correspond one-to-one in the thickness direction and have the same shape, ensuring the symmetry and mechanical balance of the cutter head 100 structure. When the cutter head 100 is used for high-speed rotating cutting, the symmetrical structure can avoid abnormal vibration or stress concentration, improving the cutting stability and reliability of the cutter head 100, while ensuring consistent performance on both sides.

[0038] In this invention, the distance from the welding end 101 to the cutting edge end 102 is the width direction of the cutting head 100, and at least one first groove region 21 extends from the welding end 101 to the cutting edge end 102 in the width direction. This through-groove design allows a high-concentration diamond region to extend from the welding end 101 to the cutting edge end 102, ensuring that the cutting edge end 102 always has a serrated cross-section. This provides a continuous diamond supply for the entire cutting head 100, ensuring that even when the cutting head 100 is worn to a later stage, there is still a high concentration of diamond as a guarantee, greatly improving the overall lifespan and continuous cutting capability of the cutting head 100.

[0039] In this invention, the cutting head 100 further includes a first side surface 105 and a second side surface 106 disposed opposite to each other, the first side surface 105 to the second side surface 106 being along the length direction of the cutting head 100. At least one first groove region 21 extends from the welding end 101 to the first side surface 105, and at least one first groove region 21 extends from the welding end 101 to the second side surface 106. Extending the influence range of the groove structure to the side of the cutting head 100 optimizes the lateral cutting capability and chip removal performance of the cutting head 100.

[0040] In this invention, the first and second grooved regions are shaped as any one or a combination of arc-shaped, V-shaped, rectangular, and triangular grooves. Different groove shapes are suitable for different working conditions. V-shaped, rectangular, and triangular grooves have a more pronounced stress concentration effect, making it easier for rapid wear to occur in the non-grooved areas, resulting in higher sharpness.

[0041] As attached Figure 2 As shown in the figure, in one specific embodiment, the first pressing groove area 21 includes a first V-shaped pressing groove 211, a second V-shaped pressing groove 212, and a triangular pressing groove 213; one side of the first V-shaped pressing groove 211 extends from the welding end 101 to the first side 105, and the other side extends from the welding end 101 to the cutting edge end 102; one side of the second V-shaped pressing groove 212 extends from the welding end 101 to the second side 106, and the other side extends from the welding end 101 to the cutting edge end 102; the triangular pressing groove 213 is located between the first V-shaped pressing groove and the second V-shaped pressing groove, and one side is located at the cutting edge end 102. The first V-shaped groove 211 and the second V-shaped groove 212 ensure high-strength support and diamond supply from the welding end 101 to the side and the cutting edge end 102, while the triangular groove 213 of the cutting edge end 102 forms an independent, high-concentration tooth tip. This structure maximizes the use of the concentration difference principle, creating multiple sharp and durable cutting points while ensuring the overall structural strength of the cutting head 100. It is a high degree of unity between unique appearance and superior function.

[0042] The butterfly-tooth diamond cutting head 100 of this invention, based on the orderly arrangement of diamonds 1, actively and controllably creates alternating regions of high and low diamond concentration on the cutting head 100 through an innovative groove structure design. This structure cleverly utilizes the synergistic effect of seeking sharpness in the low concentration region and maintaining lifespan in the high concentration region, so that the cutting head 100 simultaneously has the advantages of extremely high cutting sharpness, good self-sharpening properties, ultra-long service life and excellent cutting stability, and can efficiently cope with the cutting challenges of various highly abrasive materials from stone to reinforced concrete.

[0043] In this invention, the preparation method of the butterfly-tooth diamond cutter tip 100 includes the following steps:

[0044] S1: Weigh each pre-alloyed powder according to the ratio to prepare the matrix powder.

[0045] S2: Arrange diamond 1 vertically and staggeredly on the surface of the matrix powder, apply a certain pressure to the mold at room temperature to compress the matrix powder and form a cold-pressed blank.

[0046] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0047] S4: A groove structure is formed by pressing the first cutting surface 103 and the second cutting surface 104 of the diamond cutter head to obtain the butterfly tooth-shaped diamond cutter head 100.

[0048] See appendix Figure 3 As shown, the present invention also provides a saw blade 300, comprising a circular metal substrate 200, wherein a plurality of butterfly-tooth shaped diamond cutting heads 100 are welded at intervals on the outer circumference of the circular metal substrate 200. Because the butterfly-tooth shaped diamond cutting heads 100 have excellent self-sharpening properties, sharpness, and long service life, the saw blade 300 also possesses comprehensive advantages such as fast cutting speed, high efficiency, long service life, and strong adaptability to working conditions (both dry and wet).

[0049] In this invention, a gap is formed between two adjacent butterfly-tooth shaped diamond cutting tips 100, and a relief groove 4 is formed by recessing the outer circumference of the circular metal substrate 200 at the corresponding gap position. The relief groove 4 includes a connected elongated groove 41 and a circular groove 42 from the outside to the inside. The elongated groove 41 provides the main relief function, while the circular groove 42 serves as a stress relief zone. The relief groove 4 can effectively disperse and alleviate stress concentration at the end of the groove, significantly improve the fatigue resistance and safety of the circular metal substrate 200, and prevent the circular metal substrate 200 from cracking at the groove opening under high-speed rotation.

[0050] The beneficial technical effects of the saw blade 300 using the butterfly-tooth diamond tip 100 of the present invention will be explained below through several examples and comparative examples. Example 1

[0051] A saw blade includes a circular metal substrate with multiple butterfly-tooth shaped diamond cutting tips welded at intervals around its outer circumference. The butterfly-tooth diamond cutting tips are formed by sintering multiple layers of cold-pressed blanks, which are formed from matrix powder and diamonds, with the diamonds arranged in an orderly manner on the blanks. Each butterfly-tooth diamond cutting tip includes a welded end connected to the metal substrate and a cutting edge end for cutting. Grooves are pressed onto both sides of the cutting edge from the welded end to the cutting edge end, creating grooved and non-grooved areas. The diamond concentration in the grooved area is greater than that in the non-grooved area (30%). The grooved areas include a first V-shaped groove, a second V-shaped groove, and a triangular groove. One side of the first V-shaped groove extends from the welded end to a first side surface, and the other side extends from the welded end to the cutting edge end. One side of the second V-shaped groove extends from the welded end to a second side surface, and the other side extends from the welded end to the cutting edge end. The triangular groove is located between the first and second V-shaped grooves, with one side located at the cutting edge end.

[0052] The method for preparing the butterfly-shaped diamond cutting tip includes the following steps:

[0053] S1: Weigh the pre-alloyed powders according to the specified proportions to prepare the matrix powder. The matrix powder comprises, by mass fraction: 15% CuSn pre-alloyed powder, 45% FeCuCo pre-alloyed powder, and 40% FeCuP pre-alloyed powder. The CuSn pre-alloyed powder has a specific composition ratio of 80% Cu and 20% Sn. The FeCuCo pre-alloyed powder has a specific composition ratio of 30% Fe, 30% Cu, and 40% Co. The FeCuP pre-alloyed powder has a specific composition ratio of 70% Fe, 20% Cu, and 10% P.

[0054] S2: Diamonds are arranged vertically and staggeredly on the surface of the matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder, forming a cold-pressed blank. The cold-pressed blank contains multiple rows of diamonds, with any row arranged vertically along the cutting edge direction and adjacent rows staggered. The diamonds have a mesh size of 40.

[0055] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0056] S4: A groove structure is formed by pressing the first and second cutting surfaces of the diamond cutter head to obtain the butterfly-tooth diamond cutter head. Example 2

[0057] A saw blade includes a circular metal substrate with multiple butterfly-tooth shaped diamond cutting tips welded at intervals around its outer circumference. The butterfly-tooth diamond cutting tips are formed by sintering multiple layers of cold-pressed blanks, which are formed from matrix powder and diamonds, with the diamonds arranged in an orderly manner on the blanks. Each butterfly-tooth diamond cutting tip includes a welded end connected to the metal substrate and a cutting edge end for cutting. Grooves are pressed onto both sides of the cutting edge from the welded end to the cutting edge end, creating grooved and non-grooved areas. The diamond concentration in the grooved area is greater than that in the non-grooved area (30%). The grooved areas include a first V-shaped groove, a second V-shaped groove, and a triangular groove. One side of the first V-shaped groove extends from the welded end to a first side surface, and the other side extends from the welded end to the cutting edge end. One side of the second V-shaped groove extends from the welded end to a second side surface, and the other side extends from the welded end to the cutting edge end. The triangular groove is located between the first and second V-shaped grooves, with one side located at the cutting edge end.

[0058] The method for preparing the butterfly-shaped diamond cutting tip includes the following steps:

[0059] S1: Weigh the pre-alloyed powders according to the specified proportions to prepare the matrix powder. The matrix powder comprises, by mass fraction: 25% CuSn pre-alloyed powder, 35% FeCuCo pre-alloyed powder, and 40% FeCuP pre-alloyed powder. The CuSn pre-alloyed powder has a specific composition ratio of 80% Cu and 20% Sn. The FeCuCo pre-alloyed powder has a specific composition ratio of 30% Fe, 30% Cu, and 40% Co. The FeCuP pre-alloyed powder has a specific composition ratio of 70% Fe, 20% Cu, and 10% P.

[0060] S2: Diamonds are arranged vertically and staggeredly on the surface of the matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder, forming a cold-pressed blank. The cold-pressed blank contains multiple rows of diamonds, with any row arranged vertically along the cutting edge direction and adjacent rows staggered. The diamonds have a mesh size of 40.

[0061] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0062] S4: A groove structure is formed by pressing the first and second cutting surfaces of the diamond cutter head to obtain the butterfly-tooth diamond cutter head. Example 3

[0063] A saw blade includes a circular metal substrate with multiple butterfly-tooth shaped diamond cutting tips welded at intervals around its outer circumference. The butterfly-tooth diamond cutting tips are formed by sintering multiple layers of cold-pressed blanks, which are formed from matrix powder and diamonds, with the diamonds arranged in an orderly manner on the blanks. Each butterfly-tooth diamond cutting tip includes a welded end connected to the metal substrate and a cutting edge end for cutting. Grooves are pressed onto both sides of the cutting edge from the welded end to the cutting edge end, creating grooved and non-grooved areas. The diamond concentration in the grooved area is greater than that in the non-grooved area (30%). The grooved areas include a first V-shaped groove, a second V-shaped groove, and a triangular groove. One side of the first V-shaped groove extends from the welded end to a first side surface, and the other side extends from the welded end to the cutting edge end. One side of the second V-shaped groove extends from the welded end to a second side surface, and the other side extends from the welded end to the cutting edge end. The triangular groove is located between the first and second V-shaped grooves, with one side located at the cutting edge end.

[0064] The method for preparing the butterfly-shaped diamond cutting tip includes the following steps:

[0065] S1: Weigh the pre-alloyed powders according to the specified proportions to prepare the matrix powder. The matrix powder comprises, by mass fraction: 35% CuSn pre-alloyed powder, 25% FeCuCo pre-alloyed powder, and 40% FeCuP pre-alloyed powder. The specific composition ratio of CuSn pre-alloyed powder is 80% Cu and 20% Sn. The specific composition ratio of FeCuCo pre-alloyed powder is 30% Fe, 30% Cu, and 40% Co. The specific composition ratio of FeCuP pre-alloyed powder is 70% Fe, 20% Cu, and 10% P.

[0066] S2: Diamonds are arranged vertically and staggeredly on the surface of the matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder, forming a cold-pressed blank. The cold-pressed blank contains multiple rows of diamonds, with any row arranged vertically along the cutting edge direction and adjacent rows staggered. The diamonds have a mesh size of 40.

[0067] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0068] S4: A groove structure is formed by pressing the first and second cutting surfaces of the diamond cutter head to obtain the butterfly-tooth diamond cutter head.

[0069] Comparative Example 1

[0070] A saw blade includes a circular metal substrate with multiple butterfly-tooth shaped diamond cutting tips welded at intervals around its outer circumference. The butterfly-tooth diamond cutting tips are formed by sintering multiple layers of cold-pressed blanks, which are formed from matrix powder and diamonds, with the diamonds arranged in an orderly manner on the blanks. Each butterfly-tooth diamond cutting tip includes a welded end connected to the metal substrate and a cutting edge end for cutting. Grooves are pressed onto both sides of the cutting edge from the welded end to the cutting edge end, creating grooved and non-grooved areas. The diamond concentration in the grooved area is greater than that in the non-grooved area (30%). The grooved areas include a first V-shaped groove, a second V-shaped groove, and a triangular groove. One side of the first V-shaped groove extends from the welded end to a first side surface, and the other side extends from the welded end to the cutting edge end. One side of the second V-shaped groove extends from the welded end to a second side surface, and the other side extends from the welded end to the cutting edge end. The triangular groove is located between the first and second V-shaped grooves, with one side located at the cutting edge end.

[0071] The method for preparing the butterfly-shaped diamond cutting tip includes the following steps:

[0072] S1: Weigh the pre-alloyed powders according to the specified proportions to prepare the matrix powder. The matrix powder comprises, by mass fraction: 45% CuSn pre-alloyed powder, 15% FeCuCo pre-alloyed powder, and 40% FeCuP pre-alloyed powder. The CuSn pre-alloyed powder has a specific composition ratio of 80% Cu and 20% Sn. The FeCuCo pre-alloyed powder has a specific composition ratio of 30% Fe, 30% Cu, and 40% Co. The FeCuP pre-alloyed powder has a specific composition ratio of 70% Fe, 20% Cu, and 10% P.

[0073] S2: Diamonds are arranged vertically and staggeredly on the surface of the matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder, forming a cold-pressed blank. The cold-pressed blank contains multiple rows of diamonds, with any row arranged vertically along the cutting edge direction and adjacent rows staggered. The diamonds have a mesh size of 40.

[0074] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0075] S4: A groove structure is formed by pressing the first and second cutting surfaces of the diamond cutter head to obtain the butterfly-tooth diamond cutter head.

[0076] Comparative Example 2

[0077] A saw blade includes a circular metal substrate, with multiple diamond-distributed cutting heads welded at intervals along the outer circumference of the substrate. The diamond-distributed cutting heads are formed by sintering multiple layers of cold-pressed blanks, the cold-pressed blanks being formed from matrix powder and diamonds, with the diamonds arranged in an orderly manner on the cold-pressed blanks. The preparation method of the diamond-distributed cutting heads includes the following steps:

[0078] S1: Weigh the pre-alloyed powders according to the specified proportions to prepare the matrix powder. The matrix powder comprises, by mass fraction: 15% CuSn pre-alloyed powder, 45% FeCuCo pre-alloyed powder, and 40% FeCuP pre-alloyed powder. The CuSn pre-alloyed powder has a specific composition ratio of 80% Cu and 20% Sn. The FeCuCo pre-alloyed powder has a specific composition ratio of 30% Fe, 30% Cu, and 40% Co. The FeCuP pre-alloyed powder has a specific composition ratio of 70% Fe, 20% Cu, and 10% P.

[0079] S2: Diamonds are arranged vertically and staggeredly on the surface of the matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder, forming a cold-pressed blank. The cold-pressed blank contains multiple rows of diamonds, with any row arranged vertically along the cutting edge direction and adjacent rows staggered. The diamonds have a mesh size of 40.

[0080] S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads.

[0081] Cutting tests were conducted on the saw blades of Examples 1-3 and Comparative Examples 1-2:

[0082] The cutting equipment was a Makita D230 angle grinder (2000W) from Kunshan, Jiangsu Province.

[0083] The objects to be cut are stone (Fujian G657 granite, 70cm long and 20mm thick) and reinforced concrete blocks (including 6 threaded steel pipes with a diameter of 12mm and a concrete block thickness of 60mm); the stone is cut using a dry cutting method with the same number of cuts; the reinforced concrete blocks are cut using a wet cutting method with the same number of cuts.

[0084] During the cutting process:

[0085] Example 1: The saw blade body has a grayish-brown fracture surface, and the overall strength and hardness of the body meet the production requirements. During the cutting process, the blade feed is stable, without slippage or sparking. The diamond edge exits well, with a high exit height, and its self-sharpening properties meet the requirements for both dry and wet cutting.

[0086] Example 2: The saw blade's body fracture surface is grayish-brown in color, with good sintering density and strength and hardness that meet production requirements; during dry cutting of stone, it has a good feel, smooth feed, and no shaking or sparking; after cutting steel-concrete blocks, the number of diamonds falling off the blade tip is small, and its lifespan is long.

[0087] Example 3: The saw blade body fracture surface is reddish-brown in color, with good sintering density and strength and hardness that meet production requirements; slight sparking occurs during dry cutting of stone; the overall feel is stable during wet cutting of steel blocks, and the number of diamonds falling off is good.

[0088] During the sintering process of the saw blade matrix in Comparative Example 1, the blade tip was prone to material flow, the sintering density was good, but the strength was low. During the cutting process, the feed feel was poor. Due to the excessive increase of the low-melting-point component CuSn, firstly, the control of the production temperature became more difficult, and secondly, the large amount of liquid phase generated by the CuSn component during the sintering process would react with Fe and Co in the matrix to form excessive solid solutions and intermediate compounds, which would excessively increase the hard and brittle characteristics of the matrix, reduce the diamond holding ability, and make the diamond unable to perform the cutting and grinding function during the cutting process. A large number of diamonds fell off, and the sharpness and lifespan decreased sharply.

[0089] Comparative Example 2: During the cutting process, the cutting tool was difficult to feed and sparking occurred. The diamond cutting edge had a low exit height and poor self-sharpening properties.

[0090]

[0091] Note: Speed ​​unit (m / min); Cutting life unit (m / mm) represents the distance that can be cut with 1mm of cutter head consumed.

[0092] As can be seen from Table 1:

[0093] 1. The saw blades in Examples 1-3 employ butterfly-tooth diamond tips. Through the synergistic cooperation of a pre-alloyed powder matrix, orderly staggered diamonds, and a grooved structure, they exhibit excellent comprehensive performance in cutting tests: stone cutting speed reaches 1.83-1.92 m / min, and steel-concrete block cutting speed reaches 0.47-0.50 m / min, both higher than the comparative examples, indicating good saw blade sharpness and high cutting efficiency. Stone cutting life reaches 152.6-172.5 m / mm, and steel-concrete block cutting life reaches 9.5-13.1 m / mm, indicating strong wear resistance of the powder matrix, good diamond holding power, and long service life. The fracture surface color of the matrix is ​​grayish-brown to reddish-brown, the matrix strength and hardness meet production requirements, the sintering density is good, the cutting process is stable without sparking, the diamond edge reaches a high level, and the self-sharpening property is excellent, making it suitable for both dry and wet cutting. The 30% concentration difference between the grooved area (high concentration) and the non-grooved area (low concentration) creates a "fast and slow" wear pattern. The non-grooved area provides sharpness through rapid blade development, while the grooved area provides support to ensure lifespan. This solves the contradiction between the poor sharpness of orderly arranged blades and the uneven lifespan of disordered arranged blades.

[0094] 2. In Comparative Example 1, the excessively high CuSn content (45%) in the matrix powder led to material leakage during the sintering process, resulting in low matrix strength and poor diamond holding power. Cutting speeds (1.71 m / min for stone, 0.42 m / min for steel-concrete composite) and cutting life (81.1 m / mm for stone, 6.5 m / mm for steel-concrete composite) were both low. The cutting process exhibited poor tool feel and excessive diamond loss, indicating that when the pre-alloyed powder ratio in the matrix powder exceeded a reasonable range, performance significantly decreased, failing to meet the requirements of automated production.

[0095] 3. Comparative Example 2 uses diamond cutting heads with an ordered arrangement but no groove structure. Although the ratio of matrix powder is reasonable, the lack of concentration difference design results in a lower cutting speed (1.65 m / min for stone, 0.38 m / min for steel-concrete blocks) and a lower cutting life (102.2 m / mm for stone, 7.3 m / mm for steel-concrete blocks) than Example 1. Furthermore, the cutting process is difficult to advance, there is sparking, the diamond edge height is low, and the self-sharpening is poor. This proves the key role of the groove structure in improving sharpness and life: without the groove, the cutting head wears evenly and cannot form a serrated cutting surface, resulting in poor initial sharpness.

[0096] 4. This invention achieves high sharpness, long service life, and excellent self-sharpening properties in diamond cutting tips through a specific ratio of pre-alloyed powder matrix (CuSn 15-35%, FeCuCo 25-45%, FeCuP balance), ordered diamond arrangement, and a butterfly-tooth groove structure. Examples 1-3 all performed excellently when cutting stone and reinforced concrete blocks, while the shortcomings of Comparative Examples 1 and 2 highlight the necessity and superiority of the pre-alloyed powder ratio and groove structure design of this invention. The cutting tip of this invention is suitable for dry and wet cutting of highly abrasive materials such as granite and reinforced concrete, and has broad prospects for industrial applications.

[0097] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A butterfly-tooth shaped diamond cutting tip, formed by sintering multiple layers of cold-pressed blanks, wherein the cold-pressed blanks are made of matrix powder and diamond, and the diamonds are arranged in an orderly manner on the cold-pressed blanks; characterized in that: The matrix powder comprises, by mass fraction: 15-35% pre-alloyed powder CuSn, 25-45% pre-alloyed powder FeCuCo, and the balance being pre-alloyed powder FeCuP. The butterfly-shaped diamond cutting head includes a welded end connected to a metal substrate and a cutting edge end for cutting. A groove structure is pressed on both sides of the cutting edge from the welded end to the cutting edge end, so that the cutting head forms a grooved area and a non-grooved area. The diamond concentration in the grooved area is greater than that in the non-grooved area. The difference in diamond concentration between the grooved area and the non-grooved area is 25-35%.

2. The butterfly-tooth diamond cutting tip according to claim 1, characterized in that: The pre-alloyed powder CuSn has a specific composition ratio of 70-90% Cu and 10-30% Sn.

3. The butterfly-tooth diamond cutting tip according to claim 2, characterized in that: The specific composition ratio of the pre-alloyed powder FeCuCo is 30-35% Fe, 25-30% Cu and 40-45% Co.

4. The butterfly-tooth diamond cutting tip according to claim 3, characterized in that: The specific composition ratio of the pre-alloyed powder FeCuP is 65-75% Fe, 20-25% Cu and 5-15% P.

5. The butterfly-tooth diamond cutting tip according to claim 4, characterized in that: The cold-pressed blank contains multiple rows of diamonds, with any one row of diamonds arranged vertically along the cutting edge direction and adjacent rows staggered.

6. The butterfly-tooth diamond cutting tip according to claim 5, characterized in that: The diamond has a particle size of 30-40 mesh.

7. The butterfly-tooth diamond cutting tip according to claim 1, characterized in that: The butterfly-shaped diamond cutter head includes a first cutting surface and a second cutting surface arranged opposite to each other. The first cutting surface includes a first grooved area and a first non-grooved area, and the second cutting surface includes a second grooved area and a second non-grooved area. There are multiple first grooved areas, which are spaced apart. There are also multiple second grooved areas, which are spaced apart, so that the cutting surface forms a sawtooth undulating structure.

8. A method for preparing a butterfly-tooth diamond cutting tip according to claim 7, characterized in that: Includes the following steps: S1: Weigh each pre-alloyed powder according to the proportion to prepare matrix powder; S2: Diamonds are arranged vertically and staggered on the surface of matrix powder. A certain pressure is applied to the mold at room temperature to compress the matrix powder and form a cold-pressed blank. S3: Stack and sinter multiple cold-pressed blanks to form diamond cutting heads; S4: A groove structure is formed by pressing the first and second cutting surfaces to obtain the butterfly-tooth diamond cutter head.

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