Matrix material for diamond tool bit, sharp diamond uniformly-distributed saw blade and preparation process of sharp diamond uniformly-distributed saw blade

Abstract

The invention relates to the field of diamond tools, and particularly discloses a matrix material for a diamond tool bit, a sharp diamond uniformly-distributed saw blade and a preparation process of the sharp diamond uniformly-distributed saw blade. The matrix material for the diamond tool bit comprises the following raw materials in percentage by weight: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 0-5% of cobalt powder, 0-15% of tin powder and 5-10% of iron powder. The diamond saw blade comprises a disc-shaped base body and a diamond tool bit, and the circumferential face of the diamond tool bit is sunken inwards. The diamond tool bit is provided with two drainage grooves penetrating through the surface of the diamond tool bit, the two drainage grooves intersect or are parallel, the intersection point is located on the side, close to the disc-shaped base body, of the diamond tool bit when the two drainage grooves intersect, and a U-shaped groove is formed in the circumferential face, away from the disc-shaped base body, of the diamond tool bit. The matrix material is high in holding force on diamond particles, and accurate positioning can be achieved; in addition, the diamond saw blade is high in cutting efficiency and good in sharpness and self-sharpening performance.

Description

Technical Field

[0001] The present application relates to the technical field of diamond tools, and more specifically, to a matrix material for a diamond cutter head, a sharp diamond uniformly distributed saw blade and a preparation process thereof. Background Art

[0002] Diamond saw blades are widely used in mechanical processing of buildings, bridges, roads, etc., including the cutting of brittle and hard materials such as stone and concrete. Diamond saw blades are mainly composed of a circular matrix and a diamond cutter head welded to the outside of the matrix. The diamond cutter head is generally composed of a matrix alloy material and a certain proportion of diamond particles. During use, it is the diamond cutter head that plays a cutting role, and the cutter head is constantly consumed during the cutting process. The diamond in the cutter head plays a cutting role. The diamond particles cut stone and the like by using the holding force of the matrix alloy material on the diamond particles. In order to improve the cutting performance and service life of the diamond saw blade and reduce the production cost of the diamond saw blade, improving the holding force between the matrix alloy material and the diamond particles has always been a hot topic of research.

[0003] In the prior art, a Chinese invention patent with application number CN2018108838299 discloses a method for orderly arrangement of diamonds in a diamond saw blade segment, comprising the following steps: S1: raw material mixing: selecting a certain amount of matrix powder, passing the matrix powder into a stirring device for stirring, and after the stirring is completed, passing the matrix powder into a high-speed mixer, and passing a binder and a solvent into the high-speed mixer to obtain a mixture; S2: thin layer production: passing the mixture described in S1 into a drying box and drying it, and after the drying is completed, passing the mixture into a rolling machine to obtain a thin layer; S3: template production: selecting a diamond plate, and sequentially drilling gourd holes with spacings of 2, 3, 4, and 5 mm around the diamond plate; S4: size measurement: determining the size of the orderly arrangement of diamonds, and selecting gourd holes with appropriate spacings described in S3.

[0004] In the above-mentioned diamond cutter head, a binder is used to combine the diamond and matrix powder and then arrange them evenly. Since the binder is mostly organic, it will volatilize at a higher sintering temperature. Due to the volatilization of the binder during the sintering process, a gap is formed between the diamond particles and the matrix powder. This gap will cause the matrix powder to reduce the holding force of the diamond particles, causing the matrix material to be worn and fall off prematurely, and it is impossible to obtain good self-sharpening and cutting efficiency. Summary of the invention

[0005] In order to improve the precise grip of diamond particles by the matrix material, prevent the diamond particles from sliding, and achieve precise positioning of the diamond particle arrangement, the present application provides a matrix material for a diamond cutter head, a sharp diamond uniformly distributed saw blade, and a preparation process thereof.

[0006] In a first aspect, the present application provides a matrix material for a diamond bit, which adopts the following technical solution: A matrix material for a diamond bit comprises the following raw materials in percentage by weight: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 0-5% of cobalt powder, 0-15% of tin powder and 5-10% of iron powder.

[0007] By adopting the above technical scheme, dendritic electrolytic copper powder is used, and the rolling of diamond particles can be prevented during the uniform distribution of diamond particles, so that the diamond particles can be accurately positioned. By adjusting the content of copper-tin alloy and tin powder, the strength and brittleness of the matrix can be adjusted, the self-sharpening property of the matrix material can be improved, the cutting speed of the diamond can be increased, and the sharpness of the diamond can be increased. The cobalt powder can improve the retention of the matrix material on the diamond particles, so that the diamond is not easy to fall off. Moreover, the cobalt powder is a sub-dendritic powder, which can hold the diamond particles during the uniform distribution of diamond particles and increase the mechanical meshing ability of the cold-pressed blank in the cold-pressed layer. The iron powder is oxidized during the sintering process to form iron oxide, and the iron oxide can react with the surface of the diamond particles to make the surface of the diamond particles rough, thereby increasing the self-sharpening property of the diamond and the retention of the diamond by the matrix material.

[0008] Optionally, the matrix material includes the following raw materials in weight percentage: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 3-5% of cobalt powder, 10-15% of tin powder, and 5-10% of iron powder.

[0009] By adopting the above technical solution, the dendritic morphology of electrolytic copper powder and cobalt powder can improve the holding force of the matrix material on the diamond particles, increase the self-sharpening and cutting efficiency.

[0010] Optionally, the matrix material includes the following raw materials in weight percentage: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 10-15% of tin powder, and 5-10% of iron powder.

[0011] By adopting the above technical solution, tin powder and copper-tin alloy are used to adjust the strength and brittleness of the matrix and improve the self-sharpening property.

[0012] In a second aspect, the present application provides a sharp diamond uniformly distributed saw blade, which adopts the following technical solution: A sharp diamond uniformly distributed saw blade, comprising a disc-shaped base and a plurality of diamond segments uniformly arranged on the radial outer edge of the disc-shaped base, wherein the disc-shaped base between adjacent diamond segments is provided with a chip removal groove, and characterized in that the circumference of the diamond segment is inwardly concave; The diamond tool head comprises a plurality of overlapping carcass layers and a diamond layer arranged between adjacent carcass layers, wherein the carcass layers are formed by pressing carcass materials, and the diamond layer is formed by evenly distributed diamond particles; The thickness of the multi-layer carcass layer gradually decreases from the middle position of the diamond bit to the two sides of the diamond bit thickness. The multi-layer diamond layer has two or more diamond particle concentrations, and the diamond layers with different diamond particle concentrations are alternately arranged on both sides of the carcass layer. The surface of the diamond cutter head is provided with two drainage grooves penetrating the surface of the diamond cutter head. The two drainage grooves are arranged in parallel or crosswise, and the intersection point is located on the side of the diamond cutter head close to the disc-shaped substrate; A U-shaped groove is provided on the peripheral surface of the diamond bit away from the disc-shaped base, and the U-shaped groove is located between the two drainage grooves.

[0013] By adopting the above technical scheme, the disc-shaped substrate is processed from a metal substrate into a circle with a predetermined diameter and thickness. As the main body supporting the diamond bit, it should have high strength, not easy to deform under the conditions of use and good toughness. The disc-shaped substrate must have good rigidity under the conditions of cutting operation to prevent it from deforming during cutting. In addition, the disc-shaped substrate will be elastically deformed by the combined effect of tangential force and normal force during use, so the disc-shaped substrate is required to have certain elasticity and toughness. Due to the cutting action, the diamond bit and the cutting object, such as concrete, will be accompanied by a large amount of frictional heat during cutting, so the disc-shaped substrate and the diamond bit are required to have a basically equivalent thermal friction coefficient, especially under the dry cutting action without forced coolant, so the disc-shaped substrate is preferably a steel-based substrate. For example, for a circular metal substrate for high-frequency welding, 50Mn2V, 65Mn, 75Cr1, 8CrV, etc. can be used, and for a circular metal substrate for laser welding, 25CrMo, 28CrMo, 35CrMo, etc. can be used.

[0014] The circumference of the diamond bit is concave inward, presenting a concave structure. The diamond particles in the diamond bit are different, and at least two types are set. Diamond layers with different concentrations are alternately arranged between the matrix layers. The thickness of the matrix layer gradually decreases toward both sides along the thickness direction of the diamond bit. When cutting, part of the stone will protrude from the concave part. The protruding part of the stone can be squeezed and crushed by the vibration of the saw blade during cutting, and discharged in the channel formed through the middle concave position along with the cooling water.

[0015] When cutting, the diamond bit will produce debris, which may be diamond chips, stone chips or tire body chips. Diamond chips are relatively hard. During the cutting process, if they are not discharged in time, they will be pressed into the processing object with the horizontal movement of the saw blade, increasing the local hardness of the processing object and the resistance to the horizontal movement of the saw blade, resulting in a decrease in the sharpness of the saw blade. The tire material chips and stone chips are relatively soft. During the cutting process, the diamond bit cuts the stone first, and the horizontal forward resistance of the saw blade is small. However, the softer stone chips and tire body chips will act as solid lubricants during the cutting process, making it impossible for the diamond bit to cut the stone. The horizontal movement of the saw blade changes from cutting to impact, and the cutting resistance increases. A U-shaped groove is set on the diamond bit to facilitate the discharge of debris, which can reduce the impact of debris on the saw blade cutting process.

[0016] Two cross-drainage grooves are provided on the diamond cutter head to facilitate the outflow and discharge of cooling water, so that the cutter head can be cooled as quickly as possible and the debris can be discharged in time. When the saw blade has a high rotation speed during cutting, the cooling water moves upward along the groove of the drainage groove relative to the saw blade. At this time, the chips can be discharged in the groove of the drainage groove along with the cooling water. When the cutter head is removed from the cutter head, the cooling water can flow into the groove at the bottom of the drainage groove on the other side. The backflow of cooling water can take away the heat generated during the cutting process, reduce the temperature of the cutter head, and prevent the carcass from softening due to high temperature.

[0017] Optionally, the distance between the intersection of the drainage grooves and the bottom of the U-shaped groove is 0.1-0.4 times the height of the diamond bit.

[0018] By adopting the above technical solution, when the debris in the drainage groove jumps out of the drainage groove due to the rotation of the cutter head during the flow of cooling water, the bottom of the U-shaped groove is at an appropriate distance from the drainage groove, and the broken debris can be discharged from the U-shaped groove.

[0019] Optionally, the depth of the U-shaped groove is 0.4-0.7 times the height of the diamond bit, and the width of the U-shaped groove is 3-6 mm.

[0020] By adopting the above technical solution, the heat dissipation and heat transfer capabilities of the U-shaped groove can be optimized, so that the cutter head can complete cutting more smoothly and ensure the cutting effect.

[0021] Optionally, the angle between the two drainage grooves close to the U-shaped groove is 90-135 degrees.

[0022] By adopting the above technical solution and the setting method of the above angles, by adjusting the formation angle of the drainage groove, the effect of reducing cutting resistance and improving cutting sharpness can be better exerted. During high-speed cutting, the high heat generated by the cutting head and the material can be brought along to ensure the sharpness of the cutting head.

[0023] Optionally, the drainage groove has a width of 2-4 mm.

[0024] By adopting the above technical solution, the drainage groove of this width can facilitate the discharge of debris and cooling water, thereby reducing the heat generated during cutting.

[0025] Optionally, the distance between the intersection of the drainage grooves and the disc-shaped base is 2-4 mm.

[0026] By adopting the above technical solution, as the diamond cutter head is continuously worn, when it reaches the intersection of the drainage groove, it means that the diamond cutter head has been used up, which is convenient for protecting the disc-shaped substrate.

[0027] In a second aspect, the present application provides a process for preparing a sharp diamond uniformly distributed saw blade, which adopts the following technical solution: A preparation process of a sharp diamond uniformly distributed saw blade comprises the following steps: Preparation of carcass material: uniformly mixing dendritic electrolytic copper powder, copper-tin alloy, cobalt powder, tin powder and iron powder to obtain carcass material; Preparation of carcass layer: cold pressing the carcass material to obtain carcass layers of different thicknesses, wherein the height of the carcass layer decreases as the thickness increases, and a U-shaped groove is provided on the carcass layer; Diamond layer preparation: Diamond particles of different concentrations are evenly distributed on carcass layers of different thicknesses to form a diamond layer, and the diamond layer and carcass layer are arranged at intervals; Sintering: During the sintering process, two intersecting drainage grooves are opened on the diamond bit. The two drainage grooves run through the surface of the diamond bit. The sintering temperature is 750-800℃ and the holding time is 1-2min. Appearance treatment: sandblast the sintered diamond bit; Welding: weld the sandblasted diamond segment to the disc-shaped substrate for 4-7 seconds. If the welding strength is greater than 300MPa, the welding is completed and the diamond saw blade is obtained. Sharpening: scrape, polish and soak the diamond saw blade in oil.

[0028] By adopting the above technical scheme, matrix layers of different heights and thicknesses are arranged, with the matrix layer with the largest thickness and the smallest height as the center of the diamond bit, and diamond particles are symmetrically and evenly distributed. Then, the thickness and height of the matrix layers are adjusted so that the thickness of the matrix layers gradually decreases from the matrix layer at the center position to both sides, while the height gradually increases, thereby forming a concave structure. The concentrations of diamond particles in different diamond layers are different, and at least two different concentrations are set. The diamond layers of the two concentrations are alternately arranged between the matrix layers, so as to improve the hardness and self-sharpening property of the diamond bit.

[0029] The middle carcass layer is the thickest, while the outermost carcass layer is thinner, so the middle carcass layer will be worn faster than the carcass layers on both sides. Therefore, during use, the cutter head can always maintain an inward concave shape, so that the cutting resistance of the cutter head is small and the self-sharpening property is good. It is used in the processing of granite, marble and other stone materials and the cutting of concrete pavements. It has the characteristics of fast cutting speed, high cutting sharpness, stable performance, and helps to reduce energy consumption.

[0030] In summary, this application has the following beneficial effects: 1. Since the present application adopts dendritic electrolytic copper powder, cobalt powder, tin powder, copper-tin alloy and iron powder to prepare the matrix material, the dendritic electrolytic copper powder, cobalt powder and titanium powder can improve the retention of the matrix material on the diamond particles, so that the diamond particles can be accurately positioned and evenly distributed on the matrix material, and are not easy to fall off, while increasing the self-sharpening and strength of the diamond bit and improving the cutting efficiency.

[0031] 2. The peripheral surface of the diamond cutter head in the sharp diamond uniformly distributed saw blade in the present application presents an inwardly concave structure, and by adjusting the concentration of the matrix layer and the diamond particles, the diamond cutter head always maintains an inwardly concave structure during use, which can improve cutting efficiency and heat dissipation effect.

[0032] 3. The sharp diamond uniformly distributed saw blade of the present application is provided with a U-shaped groove and two mutually intersecting drainage grooves, which can increase the cooling water flow, facilitate the discharge of debris and cooling water, and accelerate the dissipation of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the planar structure of a sharp diamond uniformly distributed saw blade in this application; Figure 2 This is a schematic diagram of the planar structure of a sharp diamond uniformly distributed saw blade in this application; Figure 3 for Figure 1 A cross-sectional view of the peripheral surface structure of the diamond bit taken along the AA axis.

[0034] In the figure, 1, disc-shaped base; 11, chip groove; 12, mounting hole; 2, diamond bit; 21, U-shaped groove; 22, drainage groove; 23, carcass layer; 24, diamond layer; 25, middle part; 26, second outer part; 27, outermost part; B, cooling water direction when entering the tool; C, cooling water direction when exiting the tool. DETAILED DESCRIPTION

[0035] The following examples further illustrate the present application in detail. Example

[0036] Embodiment 1-4: A matrix material for a diamond bit 2, the weight percentage of the raw materials is as shown in Table 1, the particle size of the dendritic electrolytic copper powder is 500 mesh, the average particle size of the cobalt powder is 1-6 microns, the particle size of the copper-tin alloy is 1000 mesh, the particle size of the tin powder is 300 mesh, and the particle size of the iron powder is 200 mesh. The dendritic electrolytic copper powder and the sub-dendritic cobalt powder can prevent the rolling of the diamond particles and enable the diamond particles to be precisely positioned.

[0037] Table 1 Amount of raw materials used for the matrix material of the diamond segment 2 in Examples 1-4 and Comparative Examples 1-2 Example 5: A sharp diamond uniformly distributed saw blade, see Figure 1 , comprising a disc-shaped substrate 1 and diamond bits 2 evenly arranged on the radial outer edge of the disc-shaped substrate 1, there are no less than two diamond bits 2, a chip removal groove 11 is provided between each two adjacent diamond bits 2, a mounting hole 12 is provided at the center of the disc-shaped substrate 1, and the mounting hole 21 is used to mount the diamond saw blade on the driving shaft or working spindle of the working equipment; the diameter of the disc-shaped substrate 1 can be designed to be 100-300mm according to needs.

[0038] See also Figure 2 A U-shaped groove 21 is provided on the circumference of the diamond bit 2 away from the disc-shaped base 1. The depth of the U-shaped groove 21 is 0.4-0.7 times the height of the diamond bit, and 0.5 times is taken as an example in this embodiment. The width of the U-shaped groove 21 is 3-6 mm, and 4 mm is taken as an example in this embodiment. When the saw blade is cutting, a certain amount of debris will be generated, including diamond debris, processing object debris and matrix debris. The U-shaped groove 21 can increase the cooling water flow, facilitate the discharge of debris and the circulation of cooling water, reduce the impact of debris on the sharpness of the diamond saw blade, and also help to reduce the processing temperature.

[0039] See also Figure 2 Two drainage grooves 22 are provided on the diamond bit 2, and the two ends of the two drainage grooves 22 respectively penetrate the radial direction of the diamond bit 2, connecting the circumferential surface of the diamond bit 2 away from the disc-shaped substrate 1 and the circumferential surface of the diamond bit 2 close to the disc-shaped substrate 1; the two drainage grooves 22 can be arranged in parallel or in a cross-arrangement, and the cross-arrangement is taken as an example in this embodiment; the intersection of the two drainage grooves 22 is located on the side of the diamond bit 2 close to the disc-shaped substrate 1, and the distance between the intersection and the disc-shaped substrate 1 is 2-4mm, and 3mm is taken as an example in this embodiment.

[0040] During the use of the diamond saw blade, the side of the diamond segment 2 away from the disc-shaped base 1 is the outer side of the diamond saw blade, which is first involved in cutting, grinding and other operations. The rotation circumference of the outer side of the diamond saw blade is larger, and the interval between the two drainage grooves 21 is larger, which can achieve more uniform circulation of cooling water to achieve the purpose of cooling; the axial thickness of the part of the diamond segment 2 close to the intersection of the two drainage grooves 22 is lower, and the density of the grooves is high, which will affect the hardness of the diamond segment 2 itself, and in combination with the diamond segment 2, a U-shaped groove 21 is also provided. The intersection of the U-shaped groove 21 and the two drainage grooves 22 is close to the center line of the diamond segment 2. Therefore, the intersection of the two drainage grooves 22 is set on one side close to the disc-shaped base 1, and the U-shaped groove 21 is located on the other side away from the disc-shaped base 1, which also helps to reduce the impact on the hardness of the diamond segment 2 itself.

[0041] The width of the two drainage grooves 22 is 2-4mm, and 4mm is taken as an example in this embodiment. The angle between the two drainage grooves 22 near one side of the U-shaped groove is 90-135°, and 90° is taken as an example in this embodiment. The distance between the intersection of the drainage grooves 22 and the bottom of the U-shaped groove 21 is 0.1-0.4 times the thickness of the diamond cutter head, and 0.2 times is taken as an example in this embodiment. The cooling water refluxes in the two drainage grooves 22, which is beneficial to the cooling of the diamond cutter head 2 and the removal of debris. When the cooling water enters the cutter, due to the high rotation speed of the saw blade, the cooling water moves upward along the drainage groove 22 relative to the saw blade, and the chips can be discharged in the drainage groove 22 with the cooling water; when the cutter head is out of the cutter, the cooling water can flow into the drainage groove 22 at one end of the other drainage groove 22 near the disc-shaped substrate 1. The heat generated during the cutting process is taken away by the reflux of the cooling water, so that the temperature of the cutter head is reduced, and the carcass material is prevented from softening due to high temperature.

[0042] See also Figure 1 and Figure 3The circumference of the diamond bit 2 is inwardly concave and presents a concave type. The diamond bit 2 includes a plurality of overlapping carcass layers 23 and a diamond layer 24 arranged between adjacent carcass layers 23. The carcass layer 23 is formed by pressing the carcass material made in Example 1. The diamond layer 24 is formed by uniformly distributing diamond particles on the carcass layer 23 using a uniform distribution device. The carcass layer 23 located in the middle of the thickness direction of the diamond bit 2 has the largest thickness, and the thickness of the multi-layer carcass layers 23 gradually decreases from the middle of the diamond bit 3 toward the thickness of both sides of the diamond bit 2. The concentration of diamond particles in all diamond layers 24 is set to 2 or more, and the concentration of diamond particles in different diamond layers 24 is alternately set, and each diamond layer 24 is located between two carcass layers 23. At least one layer located in the middle of the thickness of the diamond bit 2 As the middle part 25, the middle part 25 is located in the middle part of the diamond bit 2 when it is in operation, and the multiple layers located on the outermost side of the diamond bit 2 are as the outermost part 27. The multiple layers located between the outermost part 27 and the middle part 25 are the connecting part of the outermost part 27 and the middle part 25. As the secondary outer part 26, in this embodiment, a carcass layer 23 located in the middle position of the diamond bit 2 and the diamond layers 24 on both sides of the carcass layer 23 are the middle part 25, the carcass layer 23 located on the side of the middle part 25 away from the middle position of the thickness of the diamond bit 2, and a diamond layer 24 in contact with the carcass layer 23 are as the secondary outer part 26, and the three carcass layers 23 located on the side of the secondary outer part 26 away from the middle position of the thickness of the diamond bit 2, and the diamond layers 24 spaced apart from the three carcass layers 23 are as the outermost part 27. During cutting, part of the stone will protrude from the concave part of the diamond bit 2. The protruding part of the stone can be squeezed and crushed by the vibration of the saw blade during cutting, and then discharged through the channel formed by the inward concave surface of the diamond bit 2 together with the cooling water.

[0043] The preparation process of the sharp diamond uniformly distributed saw blade comprises the following steps: S1. Preparation of a disc-shaped substrate 1: A disc-shaped blank with a mounting hole 12 in the center and a diameter of 300 mm is obtained by laser cutting, a chip groove is processed on the outer edge of the disc-shaped blank, the flat surface, inner hole, and outer circle are polished, and burrs are removed to obtain a disc-shaped substrate 1. The material of the disc-shaped substrate 1 is 25CrMo steel plate.

[0044] S2. Preparation of carcass material: According to the raw material dosage in Example 1, weigh the raw materials of the carcass material, mix them in a three-dimensional mixer for 70 minutes to obtain the carcass material.

[0045] S3, preparation of carcass layer 23: placing carcass material in a mold for forming a U-shaped groove 21, and cold pressing the green body to obtain a carcass layer 23 with a U-shaped groove 21, and repeating this step to form a plurality of carcass layers 23 with different thicknesses and heights, wherein the height of the carcass layer 23 decreases with increasing thickness, and the depth of the U-shaped groove 21 on carcass layers 23 of different thicknesses is 0.5 times the height of the diamond bit 2, and the width of the U-shaped groove is 4 mm.

[0046] S4, preparation of diamond layer 24: the thickest carcass layer 23 is taken as the center position of the diamond bit 2, and diamond particles are evenly distributed on both sides of the carcass layer 2 to form diamond layers 24 located on both sides of the carcass layer 23, and the whole is taken as the middle part 25; then a carcass layer 23 is placed on both sides of the middle part 25, and diamond particles are evenly distributed on the carcass layer 23 to obtain a sub-outer part 26; three carcass layers 23 are placed on both sides of the sub-outer part 26, and diamond particles are evenly distributed at intervals of the three carcass layers 23 to obtain an outermost part 27 composed of three carcass layers 23 and two diamond layers 24, the thickness of the carcass layer 23 in the middle part 25 is greater than the thickness of the carcass layer 23 in the sub-outer part 26, and the carcass layer 23 in the sub-outer part 26 is The thickness of 23 is greater than the thickness of the carcass layer 23 in the outermost part 27, and the thickness of the carcass layer 23 in the outermost part 27 gradually decreases toward both sides along the thickness direction of the diamond bit 2; the diamond particles in the diamond layers 24 on both sides of each carcass layer 23 have different concentrations, and the diamond particles in all diamond layers 24 in the diamond bit 2 are set to have two concentrations, which are 1.5% and 3.5% respectively, and the two different concentrations of diamond layers 24 are alternately arranged between the carcass layers 23; according to the height adjustment of the carcass material, the position of the carcass layer 23 in the outermost part 27, the sub-outer part 26 and the middle part 25 makes the circumferential interface of the diamond bit 2 concave, and the structure on both sides of the carcass layer 23 in the thickness direction of the center position of the diamond bit 2 is the same.

[0047] S5, sintering: during the sintering process of the product obtained in step S4, two mutually intersecting drainage grooves 22 are formed, both ends of the two drainage grooves 22 penetrate the surface of the diamond bit 2, the intersection of the two drainage grooves 22 is located at the bottom of the U-shaped groove 21, and the distance from the bottom of the U-shaped groove 21 is 0.2 times the height of the diamond bit 2, the angle between the two drainage grooves 22 and the side close to the U-shaped groove 21 is 90°, the sintering temperature is 760°C, and the sintering time is 2 min; S6, appearance treatment: sandblasting the sintered diamond cutter head 2, and then grinding the working surface with a grinding wheel to expose the diamond; S7, welding: placing the diamond segment 2 and the disc-shaped substrate 1 at corresponding positions, laser welding, so that the diamond segment 2 and the disc-shaped substrate 1 are welded together at the moment of laser penetration, the welding time is 4s, and the welding strength of each diamond segment 2 is tested with a strength standard of 300MPa to obtain a diamond saw blade; S8. Sharpening: scrape, polish and soak the diamond saw blade in oil.

[0048] Embodiment 6: A sharp diamond uniformly distributed saw blade, which is different from Embodiment 5 in that the carcass layer 23 adopts the raw material formula in Embodiment 2.

[0049] Embodiment 7: A sharp diamond uniform distribution saw blade, which is different from Embodiment 5 in that the carcass layer 23 adopts the raw material formula in Embodiment 3.

[0050] Embodiment 8: A sharp diamond uniform distribution saw blade, which is different from Embodiment 5 in that the carcass layer 23 adopts the raw material formula in Embodiment 4.

[0051] Comparative Example Comparative Example 1-4: A matrix material for a diamond bit, which differs from Example 1 in that the weight percentages of the raw materials are as shown in Table 1.

[0052] Comparative Example 5: A sharp diamond uniformly distributed saw blade, which is different from Example 5 in that the diamond bit 2 is not configured to have a concave circumferential surface structure, and the circumferential surface height of the diamond bit 2 is the same.

[0053] Comparative Example 6: A sharp diamond uniformly distributed saw blade, which differs from Example 5 in that two drainage grooves 22 are not provided.

[0054] Comparative Example 7: A sharp diamond uniformly distributed saw blade, which differs from Example 5 in that the U-shaped groove 21 is not provided.

[0055] Performance testing 1. Performance test of matrix material: The raw materials in Examples 1-4 and Comparative Examples 1-4 were mixed, pressed and formed, and then sintered at 760° C. for 2 min to obtain matrix material samples. The matrix materials prepared in Examples 1-4 and Comparative Examples 1-4 were pressed, and diamond particles (with a particle size of 50 / 60) with a concentration of 20% were evenly distributed on the pressed matrix layer 23, and then sintered at 760° C. for 2 min. According to GB / T5319-2002 "Determination of transverse rupture strength of sintered metal materials (excluding cemented carbide)" The bending strength was tested and the test results were recorded in Table 2.

[0056] Table 2 Test of the holding force of matrix materials on diamond particles Table 2 shows that after adding diamond particles to the matrix material prepared in Example 1, the holding force of diamond is good and the loss rate of compressive strength is small; in Example 2, no cobalt powder is added, and the holding force of the matrix material prepared is slightly reduced compared with that in Example 1; in Example 3, no tin powder is added, and the loss rate of bending strength is slightly increased; in Example 4, no tin powder and cobalt powder are added, and the holding force of the matrix material on diamond particles is affected to a certain extent.

[0057] Compared with Example 1, in Comparative Example 1, cobalt powder and tin powder were not added, and copper-tin alloy was used instead of cobalt powder and tin powder. It can be seen that the bending strength of the matrix material is affected, and the holding force of the matrix material on the diamond particles is reduced.

[0058] In Comparative Example 2, only copper-tin alloy and iron powder are used as matrix materials. Compared with Example 1, the bending strength of the matrix material decreases, and the holding force on diamond particles decreases significantly.

[0059] Compared with Example 1, Comparative Example 3 uses tin powder instead of copper-tin alloy. Table 2 shows that the matrix material prepared in Comparative Example 3 has a decreased retention force on diamond particles and an increased rate of change in flexural strength.

[0060] Compared with Example 1, in Comparative Example 4, copper-tin alloy is used instead of iron powder. It can be seen that the holding force of the matrix material on the diamond particles is slightly weakened.

[0061] 2. Performance test of sharp diamond uniform saw blade: According to the structure and process of Examples 5-8 and Comparative Examples 5-7, sharp diamond uniformly distributed saw blades were prepared, the thickness of the diamond head 2 was 2 mm, the thickness of the disc-shaped substrate 1 was 2 mm, the impact toughness was tested according to GB / T 5318-1985 "Unnotched impact specimens of sintered metal materials (excluding cemented carbide)", the bending strength was tested according to GB / T5319-2002 "Determination of transverse fracture strength of sintered metal materials (excluding cemented carbide)", and concrete was cut. The cutting rate was 2.2 m / min, the cutting depth was 80 mm, and the total cutting length of each saw blade was 100 m. The current and power during the cutting process were tested. Ten saw blade specimens were tested for each Example and Comparative Example, and the average current and average density were recorded in Table 3.

[0062] Table 3 Performance test of sharp diamond uniform saw blade It can be seen from the data in Table 3 that the sharp diamond uniformly distributed saw blades prepared in Examples 5-8 have smaller cutting currents than those in Comparative Examples 5-7, consume less electrical energy, and have higher impact toughness and bending strength.

[0063] In Comparative Example 5, the peripheral surface of the diamond bit 2 is set to a plane without a concave surface, so that the debris is not easily discharged during cutting and the sharpness is reduced; in Comparative Examples 6 and 7, no drainage groove or U-shaped groove is set, so the debris and cooling water are not easily discharged, the cutting efficiency is reduced, and the cutting energy consumption is increased.

[0064] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A matrix material for a diamond bit, characterized in that: The invention comprises the following raw materials in weight percentage: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 0-5% of cobalt powder, 0-15% of tin powder and 5-10% of iron powder.

2. The matrix material for a diamond bit according to claim 1, characterized in that: The matrix material comprises the following raw materials in weight percentage: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 3-5% of cobalt powder, 10-15% of tin powder, and 5-10% of iron powder.

3. The matrix material for a diamond bit according to claim 1, characterized in that: The matrix material comprises the following raw materials in percentage by weight: 50-60% of dendritic electrolytic copper powder, 20-40% of copper-tin alloy, 10-15% of tin powder, and 5-10% of iron powder.

4. A sharp diamond uniformly distributed saw blade, comprising a disc-shaped base (1) and a plurality of diamond segments (2) uniformly arranged on the radial outer edge of the disc-shaped base (1), wherein the disc-shaped base (1) between adjacent diamond segments (2) is provided with a chip removal groove (11), characterized in that: The circumference of the diamond bit (2) is concave inwards; The diamond bit (2) comprises a plurality of overlapping carcass layers (23), and a diamond layer (24) disposed between adjacent carcass layers (23), wherein the carcass layer (23) is formed by pressing the carcass material according to any one of claims 1 to 3, and the diamond layer (24) is formed by evenly distributed diamond particles; The thickness of the multi-layer carcass layer (23) gradually decreases from the middle position of the diamond bit (2) toward the two sides of the diamond bit (2); the diamond particle concentrations in the multi-layer diamond layer (24) are two or more, and the diamond layers (24) with different diamond particle concentrations are alternately arranged on both sides of the carcass layer (23); The surface of the diamond bit (2) is provided with two drainage grooves (22) penetrating the surface of the diamond bit (2), and the two drainage grooves (22) are arranged crosswise or in parallel. When arranged crosswise, the intersection point is located on a side of the diamond bit (2) close to the disc-shaped base (1); A U-shaped groove (21) is provided on the peripheral surface of the diamond bit (2) away from the disc-shaped base body (1), and the U-shaped groove (21) is located between the two drainage grooves (22).

5. The sharp diamond uniformly distributed saw blade according to claim 4, characterized in that: The distance between the intersection of the drainage groove (22) and the bottom of the U-shaped groove (21) is 0.1-0.4 times the height of the diamond bit (2).

6. The sharp diamond uniformly distributed saw blade according to claim 4, characterized in that: The opening depth of the U-shaped groove (21) (21) is 0.4-0.7 times the height of the diamond bit (2), and the groove width of the U-shaped groove (21) is 3-6 mm.

7. The sharp diamond uniformly distributed saw blade according to claim 4, characterized in that: The angle between the two drainage grooves (22) and the side close to the U-shaped groove (21) is 90-135 degrees.

8. The sharp diamond uniformly distributed saw blade according to claim 4, characterized in that: The drainage groove (22) has an opening width of 2-4 mm.

9. The sharp diamond uniformly distributed saw blade according to claim 4, characterized in that: The distance between the intersection of the drainage grooves (22) and the disc-shaped base (1) is 2-4 mm.

10. The process for preparing the sharp diamond uniformly distributed saw blade according to any one of claims 4 to 9, characterized in that: The following steps are involved: Preparation of matrix material: uniformly mixing dendritic electrolytic copper powder, copper-tin alloy, cobalt powder, tin powder and iron powder to obtain matrix material; Preparation of carcass layer (23): cold pressing carcass material to obtain carcass layers (23) of different thicknesses, wherein the height of the carcass layer (23) decreases as the thickness increases, and a U-shaped groove (21) is provided on the carcass layer (23); Preparation of the diamond layer (24): diamond particles of different concentrations are evenly distributed on a matrix layer (23) of different thicknesses to form a diamond layer (24), wherein the diamond layer (24) and the matrix layer (23) are arranged at intervals; Sintering: During the sintering process, two mutually intersecting drainage grooves (22) are formed on the diamond bit (2), and the two drainage grooves (22) penetrate the surface of the diamond bit (2). The sintering temperature is 750-800° C., and the heat preservation time is 1-2 minutes. Appearance treatment: sandblasting the sintered diamond bit (2); Welding: welding the sandblasted diamond blade (2) to the disc-shaped substrate (1) for 4-7 seconds. If the welding strength is greater than 300 MPa, the welding is completed and a diamond saw blade is obtained. Sharpening: scrape, polish and oil the diamond saw blade.

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