A composite super-sharp granite cutter head matrix material test block and preparation method thereof

Abstract

The present application relates to the field of diamond tools, and specifically discloses a matrix material test block for composite ultra-sharp granite tool bits and a preparation method thereof. A matrix material test block for composite ultra-sharp granite tool bits comprises a matrix material blank, a matrix material sheet, and diamond particles. The matrix material blank has multiple recessed holes on at least one side, and at least one diamond particle is placed in each recessed hole. The matrix material sheet is attached to the side of the matrix material blank with the recessed holes. The preparation method comprises: pressurizing the matrix material to form a matrix material sheet; opening multiple recessed holes on at least one side of the matrix material sheet to form a matrix material blank; placing at least one diamond particle in each recessed hole of the matrix material blank, placing a matrix material sheet on the side of the matrix material blank with the recessed holes, and sintering. The matrix material test block of the present application can be used to select the optimal formula of the matrix material, has uniform distribution of diamond particles, and relatively stable test results of the bending strength of the matrix material.

Description

Technical Field

[0001] The present application relates to the technical field of diamond tools, and more specifically, to a matrix material test block for a composite ultra-sharp granite tool head and a preparation method thereof. Background Art

[0002] The diamond segment is the working body of a diamond saw blade. It consists of a matrix material and diamonds. There are many different matrix materials for diamond segments, most of which are made by mixing a variety of elemental metal powders or some basic pre-alloyed powders in a specific ratio. Currently, diamond segments are mostly produced by hot pressing and sintering. The various matrix material powders are weighed according to a specific ratio, thoroughly mixed, and then a certain concentration of diamond is added. The mixture is stirred evenly, and then placed in a hot pressing and sintering machine, where they are sintered at high temperature and high pressure to form the diamond segment.

[0003] Granite has many types due to its complex composition and diverse formation conditions. It is characterized by a compact structure, strong hardness, uniform particle distribution and high density. Therefore, the blade used for cutting and shaving granite needs to have good impact resistance and appropriate hardness. Therefore, the formula of the matrix material needs to be selected according to the physical and mechanical properties of the rock being sawed to obtain good cutting results.

[0004] When selecting the matrix material formula, it is often necessary to make the matrix material and diamond particles into test blocks, and then conduct tests on the test blocks' holding performance or wear performance and other properties to obtain a diamond bit matrix material that is more suitable for sawing the rock.

[0005] To improve the efficiency of selecting matrix material formulas, test blocks are often prepared manually by first filling a layer of powdered matrix material into a mold, then manually placing diamond particles on this layer of powdered matrix material, and then filling another layer of powdered matrix material into the mold to finally make a test block. However, this method is prone to problems such as multiple diamond particles being located in the same position in the matrix material and uneven matrix material layers when placing diamond particles, which in turn affects the test stability of properties such as the matrix material's grip on diamond particles. Summary of the Invention

[0006] In order to improve the stability of the holding force detection of the matrix material in the test block, the present application provides a matrix material test block for a composite ultra-sharp granite tool bit and a preparation method thereof.

[0007] In a first aspect, the present application provides a composite ultra-sharp granite cutter head matrix material test block, which adopts the following technical solution:

[0008] A matrix material test block for a composite ultra-sharp granite tool head comprises a matrix material blank, a matrix material sheet and diamond particles. The matrix material blank has a plurality of concave holes on at least one side, each of which contains at least one diamond particle. The matrix material sheet is laminated to the side of the matrix material blank having the concave holes.

[0009] By adopting the above technical solution, the performance of the diamond cutter head depends to a large extent on the performance of the matrix material, and the composition of the matrix material determines the performance of the matrix material. When the raw materials and dosage of the matrix material are regulated, the matrix material and diamond particles are mixed in a certain proportion to prepare a cutter head test block for selecting the matrix material raw materials. However, if the diamond particles are unevenly distributed in the test block, the diamonds cannot be effectively utilized and are wasted in the diamond-rich area. Moreover, the diamond concentration in the diamond-rich area is high, the diamonds are dense, the diamond sawing force is small, and the diamonds are easily broken, which affects the actual bending resistance test results of the matrix material and is not conducive to selecting the best matrix material formula. A plurality of concave holes are opened on the matrix material blank, and then the diamond particles are placed in the concave holes, and then a matrix material sheet is fitted with the matrix material blank to seal the concave holes. The holes are fixed on the matrix material blank to form a test block. When the bending strength test of the test block is carried out, the diamond particles are distributed more evenly in the test block because the position of the concave holes is fixed on the matrix material blank. The diamond particles will not be difficult to disperse evenly when placed in the powdered matrix material. Therefore, it is not easy to produce a situation where the enrichment of diamond particles causes a large difference in the test results of multiple groups of the same matrix material formula, making it difficult to evaluate the true holding force of the matrix material on the diamond particles. Therefore, in this application, the concave holes distributed on the matrix material blank are used to evenly distribute the diamond particles, so that the bending strength test results of the matrix material test block are more stable, the fluctuation range between multiple groups of data is smaller, and the holding force of the matrix material on the diamond particles can be better displayed, thereby reducing the number of tests on the matrix material formula and determining the best matrix material formula more quickly.

[0010] Optionally, the concave holes are arranged at equal intervals on one side of the carcass material blank, and there is at least one row of concave holes.

[0011] By adopting the above technical solution, the concave holes arranged at equal intervals and in multiple rows can make the diamond particles more evenly distributed on the matrix material blank. At least one row of concave holes can be arranged in a straight line or in a wavy line, thereby improving the holding force of the matrix material on the diamond material and making the bending strength test results of the test block more accurate.

[0012] Optionally, the depth of the recessed hole is 0.5-3 mm.

[0013] By adopting the above technical solution, the depth of the concave hole can make the diamond particles fall completely into the body of the matrix material blank, so that the diamond particles are located at a deeper position in the matrix material blank, and at least one diamond particle can be filled in the concave hole, thereby improving the uniformity of the distribution of the diamond particles in the matrix material blank, so that there is no diamond-enriched area in the matrix material test block, and the test results of each test block are similar, reducing the differences between multiple groups of test results, making the test results more stable, and making it easier to select the best matrix material formula.

[0014] Optionally, the diamond particles have a particle size of 50-60 mesh.

[0015] By adopting the above technical solution, if the particle size of the diamond particles is too large, the diameter of the concave holes will be larger, the number of concave holes that can be opened on the matrix material blank will be reduced, the amount of diamond particles used will be reduced, the distribution density in the matrix material will be reduced, the holding force will be reduced, and the test results will be unstable; if the particle size of the diamond particles is too small, the diameter of the concave holes will be small, the diamond particles will be difficult to place in the concave holes, and the operation will be more difficult.

[0016] In a second aspect, the present application provides a method for preparing a matrix material test block for a composite ultra-sharp granite cutter head, using the following technical solution:

[0017] A method for preparing a matrix material test block for a composite ultra-sharp granite tool head comprises the following steps:

[0018] After the carcass materials are evenly mixed, pressure is applied at 5-10 MPa for 0.5-1.5 seconds to form a carcass material sheet;

[0019] A plurality of recessed holes are formed on at least one side of the carcass material sheet to form a carcass material blank;

[0020] At least one diamond particle is placed in each concave hole of the matrix material blank, and a matrix material sheet is placed on one side of the concave hole opening of the matrix material blank, and the test block is prepared by sintering.

[0021] By adopting the above technical solution, the matrix material is first pressed to form a matrix material sheet, and then concave holes are opened on the matrix material sheet. The number of concave holes is determined according to the concentration and weight of the diamond particles, and the opening positions of the concave holes are adjusted so that the concave holes are evenly distributed on the matrix material blank. Then, the diamond particles are placed, and the matrix material sheet is fitted with the side of the matrix material blank where the concave holes are opened. After sintering, the matrix material blank and the matrix material sheet have good density and relatively high strength, hardness and toughness, and also have a relatively strong mechanical embedding effect on the diamond particles wrapped therein, thereby simulating the structure of a diamond bit and better testing the holding force of the matrix material. In addition, the diamond particles are evenly distributed in the test block, reducing the enrichment of diamond particles and making the test results of the test block more stable.

[0022] Optionally, the sintering temperature is 750-950° C., and the sintering time is 3-10 minutes.

[0023] By adopting the above technical solution, at this sintering temperature, the test block structure formed by the matrix material is denser and more uniform, and has better wrapping properties for the diamond particles, thereby helping to improve the holding force for the diamond particles.

[0024] Optionally, the matrix material includes at least one of iron powder, copper powder, cobalt powder, tungsten carbide powder, manganese powder, chromium powder, tin powder, zinc powder, lead powder and nickel powder.

[0025] By adopting the above technical solution and adjusting different matrix material formulas, a matrix material for diamond tool bits is obtained, and the test blocks are prepared by a method of pressing the matrix material, opening concave holes, placing diamond particles, and then bonding the pressed matrix material. This can make the bending strength test results of the test blocks more stable, facilitating the selection of the optimal formula of the matrix material.

[0026] Optionally, the diamond particles are heat treated at 400-420° C. for 4-5 hours before being placed in the concave holes.

[0027] By adopting the above technical solution, the surface of the diamond particles after heat treatment is oxidized, the surface hydrophobic groups are reduced, and the hydrophilic groups are increased. When sintered with the matrix material blank in the concave hole, the wettability between the matrix material and the diamond particles is increased, the wrapping force and the holding force are enhanced, and the stability of the test data is further improved.

[0028] Optionally, the diamond particles are pre-treated as follows before being placed in the concave holes:

[0029] The high-temperature resistant inorganic binder is evenly mixed with silicon powder and aluminum powder to prepare a spray liquid, and the spray liquid is sprayed on the surface of the diamond particles while stirring the diamond particles. The amount of high-temperature resistant inorganic binder is 1% of the weight of the diamond particles, the amount of silicon powder is 0.05% of the weight of the diamond particles, and the amount of aluminum powder is 0.1% of the weight of the diamond particles.

[0030] By adopting the above technical solution, the high-temperature resistant inorganic binder is selected from Beijing Zhisheng Weihua Chemical Co., Ltd., model ZS-1071, which is an inorganic nano-composite adhesive made by condensation reaction of inorganic nano-materials, and is a suspension dispersion system with a neutral pH value. It not only has strong bonding strength but also is non-corrosive to the metal matrix, but also has high temperature resistance of up to 1800°C, high hardness after curing, and good strength even at high temperatures. The bonding effect of the high-temperature resistant inorganic binder is used to adhere silicon powder and aluminum powder to the surface of the diamond particles. When the aluminum powder is sintered at high temperature in the test block, the surface of the diamond particles is at a negative potential, while the aluminum powder melt is at a positive potential. Under the action of electrostatics, the aluminum element is enriched on the surface of the diamond particles, thereby improving the bonding state between the diamond particles and the matrix material, improving the matrix material's grip on the diamond particles, and improving the stability of the test results. In addition, when sintered at high temperature, the silicon powder can react with oxygen to form silicon dioxide, thereby increasing the grip between the matrix material and the diamond particles.

[0031] Optionally, the concentration of the diamond particles is 30-70%.

[0032] By adopting the above technical solution, the diamond concentration refers to the density of diamond distribution in the matrix material (that is, the weight of diamond contained per unit area). The density of diamond particles distributed in the matrix material is 30-70%, which can be closer to the cutter head product, making the test results more accurate.

[0033] Optionally, the diamond particles may be placed mechanically or manually.

[0034] By adopting the above technical solution, the placement of diamond particles in the concave hole can be achieved by mechanical placement or manual placement.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. Since the present application adopts the method of pressing the matrix material to obtain a matrix material sheet, then opening a plurality of recessed holes on the pressed matrix material sheet, placing diamond particles in the recessed holes, and then laminating the matrix material sheet to obtain a test block after sintering, the concentration of diamonds is changed by adjusting the number of recessed holes and the number of diamond particles placed in each recessed hole, so that the diamonds are evenly distributed in the test block and the density is relatively high, thereby reducing the enrichment of diamonds in the test block and improving the stability of the bending strength of multiple groups of test blocks prepared with the same matrix material formula, thereby obtaining a more accurate bending strength of the test block. Moreover, the test block prepared by this method is not only suitable for testing the matrix material of granite tool bits, but also suitable for testing the matrix materials of diamond cutting tool bits such as marble and ceramic tiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of a plan view of a carcass material test block in Example 1 of the present application;

[0038] Figure 2 Schematic diagram of a plan view of a carcass material test block in Example 2 of the present application;

[0039] Figure 3 Schematic diagram of a plan view of a carcass material test block in Example 3 of the present application;

[0040] Figure 4 Comparison of the bending strength of the carcass material test blocks prepared in Example 1 and Comparative Example 1 of the present application;

[0041] Figure 5 The bending strength test results of the carcass material test blocks prepared in Examples 1-4 of the present application;

[0042] Figure 6 The bending strength test results of the carcass material test blocks prepared in Examples 5-8 of the present application;

[0043] Figure 7 These are the bending strength results of the carcass material test blocks prepared in Example 1 and Example 13 of the present application. DETAILED DESCRIPTION

[0044] The following examples further illustrate the present application in detail.

[0045] Example

[0046] Example 1: A matrix material test block for a composite ultra-sharp granite tool segment, comprising a matrix material blank, a matrix material sheet, and diamond particles. The diamond particles have a particle size of 50 mesh. The matrix material blank and the material sheet have the same length, width, and thickness.

[0047] A plurality of recessed holes are formed on at least one side of the matrix material blank. In this embodiment, taking the recessed holes formed on one side of the matrix material blank as an example, the plurality of recessed holes are arranged at equal intervals along the length of the matrix material blank, and the recessed holes are formed in multiple rows, and the recessed holes in each row are arranged in a straight line or a wavy line. At least one diamond particle is placed in each recessed hole, and the number of diamond particles in each recessed hole is the same. The number of recessed holes is determined by the total number of diamond particles in all recessed holes to achieve a diamond concentration of 50%.

[0048] The carcass material sheet is attached to the side of the carcass material blank where the concave hole is formed.

[0049] The method for preparing the matrix material test block for the composite ultra-sharp granite cutter head comprises the following steps:

[0050] The matrix material is prepared by mixing 20% ​​iron powder, 30% tungsten carbide powder, 5% nickel powder, 20% copper powder and 25% cobalt powder according to mass percentage;

[0051] Take 10g of the matrix material, put it into a graphite mold, and apply pressure to make a matrix material sheet. The applied pressure is 10MPa and the pressing time is 0.5s.

[0052] A plurality of rows of concave holes arranged in a straight line are formed on one side of the carcass material sheet to form a carcass material blank. The depth of the concave holes is 0.5 mm, and the concave holes in each row are arranged at equal intervals along the length direction of the carcass material blank.

[0053] Use tweezers to place at least one 50-mesh diamond particle in each concave hole. The number of diamond particles in each concave hole is the same. Here, taking one diamond particle in each concave hole as an example, the number of concave holes is such that the concentration of diamond particles in all concave holes is 50%, that is, the density of diamond particles is 2.2 carats / cubic centimeter.

[0054] The carcass material sheet is attached to the side of the carcass material blank with a concave hole to form a composite material. The temperature is raised to 750°C at a rate of 120°C / min, then to 950°C at a rate of 90°C / min, and the sintering pressure is increased to 16 MPa. The temperature is kept at this temperature for 4 minutes, and the temperature is lowered to 650°C. The pressure is released and the product is taken out of the furnace to obtain a test block with a size of 5 mm × 5 mm × 30 mm. The test block is then tested for parameters such as holding force.

[0055] Example 2: A method for preparing a matrix material test block for a composite ultra-sharp granite blade. The difference from Example 1 is that only one row of concave holes arranged in a straight line is provided on the matrix material blank, and the concave holes are arranged at equal intervals along the length direction of the matrix material blank. Figure 2 .

[0056] Example 3: A method for preparing a matrix material test block for a composite ultra-sharp granite blade. The difference from Example 1 is that the matrix material blank is provided with multiple rows of concave holes, and the multiple rows of concave holes are arranged in a wavy line. Figure 3 .

[0057] Example 4: A matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that concave holes with a depth of 0.5 mm are opened on all four sides of the matrix material blank. The arrangement of the concave holes is the same as that in Example 1. The concave holes on adjacent sides are not connected to each other, and one diamond particle is placed in each concave hole. The number of concave holes makes the concentration of all diamond particles 50%.

[0058] Example 5: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles are heat treated at 420°C for 4 hours at a heating rate of 10°C / min before being placed in the concave hole, and then cooled to room temperature.

[0059] Example 6: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles are heat treated at 400°C for 5 hours at a heating rate of 10°C / min before being placed in the concave hole, and then cooled to room temperature.

[0060] Example 7: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles are heat treated at 300°C for 5 hours at a heating rate of 10°C / min before being placed in the concave hole, and then cooled to room temperature.

[0061] Example 8: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles are heat treated at 500°C for 5 hours at a heating rate of 10°C / min before being placed in the concave hole, and then cooled to room temperature.

[0062] Example 9: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles undergo the following pretreatment before being placed in the concave hole: a high-temperature resistant inorganic binder is mixed with silicon powder and aluminum powder to obtain a spray liquid, and the spray liquid is sprayed on the surface of the diamond particles while stirring the diamond particles. The amount of high-temperature resistant inorganic binder is 1% of the mass of the diamond particles, the amount of silicon powder is 0.05% of the weight of the diamond particles, and the amount of aluminum powder is 0.1% of the mass of the diamond particles; the particle size of the silicon powder is 20 nm, the particle size of the aluminum powder is 10 μm, and the high-temperature resistant inorganic binder is selected from Beijing Zhisheng Weihua Chemical Co., Ltd., model ZS-1071.

[0063] Example 10: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles undergo the following pretreatment before being placed in the concave hole: a high-temperature resistant inorganic binder is mixed with aluminum powder to obtain a spray liquid, and the spray liquid is sprayed on the surface of the diamond particles while stirring the diamond particles. The amount of high-temperature resistant inorganic binder is 1% of the mass of the diamond particles, and the amount of aluminum powder is 0.1% of the mass of the diamond particles; the particle size of the aluminum powder is 10 μm, and the high-temperature resistant inorganic binder is selected from Beijing Zhisheng Weihua Chemical Co., Ltd., model ZS-1071.

[0064] Example 11: A method for preparing a matrix material test block for a composite ultra-sharp granite tool bit. The difference from Example 1 is that when multiple diamond particles are placed in each concave hole, the diamond particles undergo the following pretreatment before being placed in the concave hole: a high-temperature resistant inorganic binder is mixed with silicon powder to obtain a spraying liquid, and the spraying liquid is sprayed on the surface of the diamond particles while stirring the diamond particles. The amount of high-temperature resistant inorganic binder is 1% of the mass of the diamond particles, the amount of silicon powder is 0.05% of the weight of the diamond particles, and the particle size of the silicon powder is 20 nm. The high-temperature resistant inorganic binder is selected from Beijing Zhisheng Weihua Chemical Co., Ltd., model ZS-1071.

[0065] Example 12: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that when multiple diamond particles are placed in each concave hole, the diamond particles undergo the following pretreatment before being placed in the concave hole:

[0066] The diamond particles were heat treated at 420 °C for 4 h at a heating rate of 10 °C / min and then cooled to room temperature;

[0067] A high-temperature resistant inorganic binder is mixed with silicon powder and aluminum powder to obtain a spray liquid, and the spray liquid is sprayed on the surface of the heat-treated diamond particles while stirring the diamond particles. The amount of high-temperature resistant inorganic binder is 1% of the weight of the diamond particles, the amount of silicon powder is 0.05% of the weight of the diamond particles, and the amount of aluminum powder is 0.1% of the weight of the diamond particles; the particle size of the silicon powder is 20nm, and the particle size of the aluminum powder is 10μm. The high-temperature resistant inorganic binder is selected from Beijing Zhisheng Weihua Chemical Co., Ltd. and the model is ZS-1071.

[0068] Example 13: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the matrix material comprises 50% iron powder and 50% copper powder.

[0069] Example 14: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the concentration of diamond particles is 30%.

[0070] Example 15: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the concentration of diamond particles is 70%.

[0071] Example 16: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the concentration of diamond particles is 15%.

[0072] Example 17: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the concentration of diamond particles is 85%.

[0073] Example 18: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the particle size of the diamond particles is 100 mesh.

[0074] Example 19: A method for preparing a matrix material test block for a composite ultra-sharp granite tool segment. The method differs from Example 1 in that the diamond particles have a particle size of 25 mesh.

[0075] Comparative Example

[0076] Comparative Example 1: A matrix material test block, comprising a matrix material and diamond particles, wherein the diamond particle concentration is 50%. The preparation method of the matrix material test block comprises the following steps:

[0077] The matrix material is prepared by mixing 20% ​​iron powder, 30% tungsten carbide powder, 5% nickel powder, 20% copper powder and 25% cobalt powder according to mass percentage;

[0078] Take 10g of matrix material, mix it evenly with diamond particles, add it into a graphite mold, and press it at a pressure of 10MPa for 2.5s to obtain a matrix material test block with a size of 5×5×30mm.

[0079] Performance testing

[0080] Stability test of carcass material test block test results:

[0081] (1) Take 6 carcass material test blocks prepared in Example 1 and Comparative Example 1, and then perform bending strength test according to the following method. The test results are recorded in Table 1, and the data in Table 1 are presented in a broken line graph, as shown in the figure below. Figure 4 shown.

[0082] Bending strength test method: The three-point bending test method was used on a CTM2500S microcomputer servo electronic testing machine (Shanghai Xieqiang Manufacturing Co., Ltd.) with a loading speed of 20N / s. The bending strength was calculated according to the following formula: f = 3PL / 2bh 2 , f is the flexural strength of the carcass material specimen, MPa; P is the maximum load when the carcass material specimen breaks, N; L is the support distance, mm; b is the width of the specimen perpendicular to the direction of the indenter, mm; h is the height of the specimen parallel to the direction of the indenter, mm.

[0083] Table 1 Bending strength of carcass material test blocks prepared in Example 1 and Comparative Example 1

[0084]

[0085] Combined with Table 1 and Figure 4 It can be seen from the data that the test results of the matrix material test block prepared by the method in Example 1 are relatively stable, and the fluctuations among the 6 groups of data are small, indicating that the matrix material is first pressed into a sheet, and then concave holes are opened and diamond particles are filled in the concave holes. This can make the diamond particles evenly distributed in the matrix material, thereby improving the stability of the test results of the matrix material test block, reducing the number of tests, and improving the test efficiency.

[0086] (2) According to the above-mentioned bending strength test method, the carcass material test blocks prepared in Examples 2-4 were tested, and 6 test blocks were taken for each test of each example to check the stability of the test results of the test blocks. The test results were recorded in Table 2, and the test results obtained in Example 1 and the test results of Examples 2-4 were formed into a broken line graph, as shown in Table 2. Figure 5 shown.

[0087] Table 2 Bending strength of carcass material test blocks prepared in Example 1 and Examples 2-4

[0088]

[0089] Combined with Table 2 and Figure 5 From the data comparison, it can be seen that when only one row of recessed holes is opened on one side of the matrix material blank, diamond particles are placed in the recessed holes, and the matrix material sheet is covered and sintered, the bending strength test of the matrix material test block is not as good as that of Example 1, indicating that the multiple rows of recessed holes make the distribution of diamond particles more uniform, thereby higher bending strength and more stable test results.

[0090] In Example 3, multiple rows of concave holes are opened on the carcass material blank, and the multiple rows of concave holes are arranged in a wavy line. It can be seen that the bending strength test results of the test blocks made thereby are similar to those of Example 1.

[0091] In Example 4, concave holes are opened on the four sides of the matrix material, and the concave holes are evenly distributed on the four sides of the matrix material blank. As a result, the diamond particles in the concave holes are more evenly distributed on the matrix material blank, thereby improving the holding force of the matrix material on the diamond particles. In addition, the variation range between the 6 groups of data measured in Example 4 is smaller, and the test results are more stable.

[0092] (3) According to the above-mentioned bending strength test method, the carcass material test blocks prepared in Examples 5-8 were tested, and 6 test blocks were taken for each test example to check the stability of the test results of the test blocks. The test results were recorded in Table 3, and the test results obtained in Example 1 and the test results of Examples 5-8 were formed into a broken line graph, as shown in Table 3. Figure 6 shown.

[0093] Table 3 Bending strength of carcass material test blocks in Example 1 and Examples 5-8

[0094]

[0095]

[0096] Combined with Table 3 and Figure 6 Compared with the data in Example 1, in Example 5 and Example 6, the diamond particles are heat treated before being placed in the concave holes, which can improve the dispersion of the diamond particles in the concave holes, prevent the diamond particles from agglomerating in the concave holes, and further improve the holding force of the matrix material on the diamond particles.

[0097] In Example 7, the heat treatment temperature of the diamond particles was reduced, and in Example 8, the heat treatment temperature of the diamond particles was increased. The treatment time was the same, but Tables 3 and Figure 6 From the data comparison, it can be seen that the retention force results of the matrix material test blocks obtained in Examples 7 and 8 on diamond particles are less stable than those in Examples 5 and 6, and the fluctuation of the test results is greater than that in Examples 5 and 6.

[0098] (4) According to the above bending strength test method, the bending strength of the carcass material test blocks of Examples 9-12 was tested. Six groups of test blocks were tested and compared with the test results obtained in the above Examples 1 and 5 and the test results of Examples 9-12. The test results are shown in Table 4.

[0099] Table 4 Bending strength test of carcass material test blocks prepared in Examples 9-12

[0100]

[0101] As can be seen from the data in Table 4, in Example 9, the diamond particles were pretreated with a spray liquid made from a mixture of a high-temperature resistant inorganic binder, silicon powder, and aluminum powder. The resulting matrix material test block had good wettability between the diamond particles and the matrix material, which improved the matrix material's grip on the diamond particles, increased the stability of the test results, reduced the fluctuation range of the test results, and reduced the impact of uneven distribution of diamond particles on the test results.

[0102] In Examples 10 and 11, silicon powder and aluminum powder were not added to the spraying liquid, respectively. Therefore, the fluctuation range of the test results of the matrix material test blocks obtained thereby was slightly increased compared with that of Example 9.

[0103] In Example 12, the diamond particles are not only heat-treated but also pre-treated with a spraying liquid. The resulting matrix material test block has an improved grip on the diamond particles, and the test results are more stable.

[0104] (5) According to the above bending strength test method, the bending strength of the carcass material test blocks prepared in Example 13 was tested. Six groups of test blocks were tested and compared with the bending strength of the test blocks prepared in Example 1. The test results are shown in Table 5, and the data in Table 5 are formed into Figure 7 .

[0105] Table 5 Bending strength test of carcass material test blocks prepared in Example 1 and Example 13

[0106]

[0107] From the comparison of the flexural strength data of the test blocks prepared in Example 6 and Example 1 in Table 5, it can be seen that different raw materials are used as the matrix material, but the test blocks are prepared by pressing the matrix material into a matrix material sheet, and then opening concave holes, placing diamond particles, bonding the matrix material sheet, and sintering. Even though the flexural strength of the obtained test blocks is lower than that of the matrix material formula of Example 1, the test results of the flexural strength of the test blocks prepared in Example 6 are still relatively stable, with little fluctuation between each other.

[0108] (6) According to the above bending strength test method, the bending strength of the carcass material test blocks of Examples 14-19 was tested. Six groups of test blocks were tested, and the test results obtained in the above Example 1 were compared with the bending strength obtained in Examples 14-19. The test results are shown in Table 6.

[0109] Table 6 Bending strength of carcass material test blocks prepared in Examples 14-19

[0110]

[0111] From the comparison of the data in Table 6, it can be seen that in Example 14 and Example 15, the diamond particle concentrations of 30% and 70% were used respectively, and the test results of the matrix material test blocks prepared were stable, similar to that of Example 1, and the fluctuation range of the six groups of test results was not large; however, in Example 16 and Example 17, the concentrations of the diamond particles were reduced and increased respectively, but the flexural strength test results of the matrix material test blocks prepared thereby fluctuated more than that of Example 1, and in Example 18 and Example 19, diamond particles of different particle sizes were used respectively, and the stability of the flexural strength of the six groups obtained was also lower than that of Example 1.

[0112] 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 non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A composite super-sharp granite cutter head matrix material test block, characterized in that: It includes a matrix material blank, a matrix material sheet and diamond particles. The matrix material blank has multiple concave holes on at least one side, and at least one diamond particle is placed in each concave hole. The matrix material sheet is attached to the side of the matrix material blank with the concave holes.

2. The matrix material test block for a composite ultra-sharp granite tool segment according to claim 1, characterized in that: The concave holes are arranged at equal intervals on one side of the carcass material blank, and at least one row of concave holes is provided.

3. The matrix material test block for a composite ultra-sharp granite tool segment according to claim 1, characterized in that: The depth of the concave hole is 0.5-3 mm.

4. The matrix material test block for a composite ultra-sharp granite tool segment according to claim 1, characterized in that: The particle size of the diamond particles is 50-60 mesh.

5. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to any one of claims 1 to 4, characterized in that: The following steps are involved: After the carcass materials are evenly mixed, pressure is applied at 5-10 MPa for 0.5-1.5 seconds to form a carcass material sheet; A plurality of recessed holes are formed on at least one side of the carcass material sheet to form a carcass material blank; At least one diamond particle is placed in each concave hole of the matrix material blank, and a matrix material sheet is placed on one side of the concave hole opening of the matrix material blank, and the test block is prepared by sintering.

6. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to claim 5, characterized in that: The sintering temperature is 750-950° C., and the sintering time is 3-10 minutes.

7. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to claim 5, characterized in that: The matrix material includes at least one of iron powder, copper powder, cobalt powder, tungsten carbide powder, manganese powder, chromium powder, tin powder, zinc powder, lead powder and nickel powder.

8. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to claim 5, characterized in that: The diamond particles are heat treated at 400-420° C. for 4-5 hours before being placed in the concave holes.

9. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to claim 5, characterized in that: The concentration of the diamond particles is 30-70%.

10. The method for preparing a matrix material test block for a composite ultra-sharp granite tool segment according to claim 5, characterized in that: The diamond particles can be placed mechanically or manually.

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