Diamond cutting pick for hard rock

Abstract

The invention discloses a diamond cutting pick for hard rock, and relates to the technical field of cutting pick machining, and the diamond cutting pick comprises a cutting pick base body, a diamond composite tooth and a diamond composite sheet wear-resistant column; a plurality of columnar holes are formed in the upper portion of the cutting pick base body at equal intervals in the circumferential direction, diamond composite sheet wear-resisting columns are welded in the columnar holes, and diamond composite teeth are welded in embedding holes in the top of the cutting pick base body. According to the invention, the diamond composite tooth is embedded in the top of the cutting tooth base body; the service life of the cutting pick is prolonged, and the fracture risk caused by impact is reduced; the cutting pick base body is provided with the cushioning grooves, so that impact force and vibration generated in the working process are effectively dispersed, the integrity of the whole structure of the cutting pick is protected, and the fracture risk caused by impact is reduced; the diamond compact wear-resistant columns are uniformly distributed in the easy-to-wear area of the upper part of the cutting pick base body, so that the crushing area of the cutting pick is increased, the crushing efficiency is improved, and the stability of the cutting pick in work is enhanced through the uniform arrangement and special shape design of the diamond compact wear-resistant columns.

Description

Technical Field

[0001] The invention relates to the field of tunnel excavation and coal mining construction, and in particular to a diamond pick for hard rock. Background Art

[0002] In industries such as mining, tunneling, geological exploration and construction, picks are key tool components that play a vital role in crushing hard materials such as rocks and coal. Traditional pick materials, such as carbide or steel picks, often suffer from rapid wear and breakage when faced with high-hardness and high-wear working environments, seriously affecting work efficiency and service life. In addition, traditional picks are also insufficient in wear resistance, impact resistance and stability when dealing with complex geological conditions.

[0003] Traditional pick materials wear quickly under long-term, high-intensity use and need to be replaced frequently, increasing production costs and downtime; when faced with hard rock formations or sudden geological changes, traditional picks are prone to breakage, affecting operational safety; traditional pick design may not fully consider the impact of vibration on pick performance, resulting in poor pick stability during operation, affecting crushing efficiency and pick life. Summary of the invention

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] A diamond pick for hard rock, comprising:

[0006] A pick base, wherein an inlay hole is provided on the top of the pick base, an easy-to-wear area is provided on the upper part of the pick base, a plurality of columnar holes are provided at equal intervals along the circumferential direction of the easy-to-wear area, and diamond composite sheet wear-resistant columns are welded in the plurality of columnar holes;

[0007] The diamond composite tooth is arranged in the embedding hole at the top of the pick base.

[0008] More preferably, the diamond composite teeth are divided into two types: bullet-shaped diamond composite teeth and mushroom-shaped diamond composite teeth.

[0009] More preferably, the circumference of the wear-resistant columns of the diamond composite sheet is processed with clearance matching with the inner diameter of the columnar hole, and the number of the wear-resistant columns of the diamond composite sheet is equal to the number of the columnar holes.

[0010] Further preferably, a damping groove is provided at the waist of the pick base, and the damping groove is arranged along the circumferential direction of the pick base, and a retaining spring groove is provided at the shank below the pick base.

[0011] A method for processing a diamond pick for hard rock, comprising the following steps:

[0012] S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, open an inlay hole on the top of the pick base, and perform vacuum furnace tempering treatment on the processed pick base so that the hardness of the pick base is HRC 38-42.

[0013] S2. Diamond micro powder mixed powder and cemented carbide base are grown at 1450℃-1550℃ and 90500-10500 atmospheres.

[0014] S3. The processed pick base, diamond composite teeth and diamond composite sheet wear-resistant column are subjected to sandblasting and decontamination treatment.

[0015] S4. Evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes.

[0016] S5. Apply flux evenly on the bottom plane of the diamond composite tooth, and evenly apply flux on the inner surface of the inlay hole of the pick base. Then put the calculated and weighed silver-based solder into the inlay hole, and finally put the diamond composite tooth.

[0017] S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 490°C-510°C, so that the flux is in a molten state.

[0018] S7. The temperature is raised to 660℃-680℃ by a medium frequency welding machine to melt the required mass of silver-based solder. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature reaches the welding temperature of 660℃-680℃ first. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the molten silver-based solder in multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 680℃-700℃, the flux and silver-based solder in the inlay hole gradually melt, and the silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the gap between the inlay hole and the diamond composite tooth is filled with the molten silver-based solder to form a body.

[0019] S8. After the temperature of the heated diamond pick reaches 680°C-700°C, the heating device is turned off. After the diamond pick cools down to a temperature lower than 600°C, the diamond pick is kept warm.

[0020] More preferably, diamond powder is selected in S2, wherein, by weight percentage, diamond accounts for 85%-95%, and the synthetic medium cobalt and nickel elements account for 5%-15%.

[0021] More preferably, the depth of the columnar hole in S1 is 7 mm-9 mm, and the depth of the inlay hole is 19 mm-25 mm.

[0022] More preferably, the thickness of the silver-based solder in S5 is 0.1 mm-0.15 mm.

[0023] Compared with the prior art, the present invention has the following advantages: by inlaying diamond composite teeth on the top of the pick base, the service life of the pick is improved and the risk of breakage due to impact is reduced; the pick base is designed with a shock-absorbing groove, which effectively disperses the impact force and vibration generated during the working process, protects the integrity of the overall structure of the pick, and reduces the risk of breakage due to impact; the diamond composite sheet wear-resistant columns evenly arranged in the easy-to-wear area on the upper part of the pick base not only increase the crushing area of ​​the pick and improve the crushing efficiency, but also further enhance the stability of the pick at work and extend its service life through its uniform arrangement and special shape design; the columnar holes are evenly arranged along the circumferential direction of the pick base, so that the arrangement of the diamond composite sheet wear-resistant columns is more reasonable, which is conducive to the uniform distribution and transmission of force, prevents eccentric wear, and improves the overall performance of the pick; the design of the retaining spring groove makes the replacement and maintenance of the pick more convenient and quick, and reduces the maintenance cost and time. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A diamond pick for hard rock, comprising:

[0026] The pick base body has an inlay hole on the top, and a plurality of columnar holes are arranged at equal intervals along the circumferential direction on the upper part of the pick base body, wherein diamond composite sheet wear-resistant columns are welded in the plurality of columnar holes.

[0027] The diamond composite teeth are welded in the embedding holes at the top of the pick base. Furthermore, the diamond composite teeth are in the shape of mushrooms and bullets. Furthermore, the diamond composite wear-resistant columns evenly arranged in the easy-to-wear area on the upper part of the pick base not only increase the crushing area of ​​the pick and improve the crushing efficiency, but also further enhance the stability of the pick at work and extend its service life through its even arrangement and special shape design. Furthermore, the columnar holes are evenly arranged along the circumferential direction of the pick base, so that the arrangement of the diamond composite wear-resistant columns is more reasonable, which is conducive to the even distribution and transmission of force, prevents eccentric wear, and improves the overall performance of the pick.

[0028] By inlaying diamond composite teeth on the top of the pick base (the base is carbide and the composite layer is diamond. Since diamond is not weldable, the weldability of the alloy is utilized, the high impact toughness of the alloy is combined with the high wear resistance of the diamond layer); the service life of the pick is increased and the risk of breakage due to impact is reduced.

[0029] Specifically, the circumference of the wear-resistant columns of the diamond composite sheet is processed with clearance matching with the inner diameter of the columnar hole, and the number of the wear-resistant columns of the diamond composite sheet is equal to the number of the columnar holes.

[0030] Specifically, a shock-absorbing groove is provided at the waist of the pick base, and a retaining spring groove is provided at the shank below the pick base. Furthermore, the pick base is designed with a shock-absorbing groove, which effectively disperses the impact force and vibration generated during the working process, protects the integrity of the overall structure of the pick, and reduces the risk of breakage caused by impact; further, the design of the retaining spring groove makes the replacement and maintenance of the pick more convenient and quick, reducing maintenance costs and time.

[0031] A method for processing a diamond pick for hard rock comprises the following steps:

[0032] S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, open an inlay hole on the top of the pick base, and perform vacuum furnace tempering treatment on the processed pick base so that the hardness of the pick base is HRC 38-42.

[0033] Furthermore, the depth of the columnar hole in S1 is 8 mm, the mushroom-shaped composite tooth embedding hole is 25 mm, and the bullet-shaped composite tooth embedding hole is 19 mm. The cutting teeth are formed by CNC turning and CNC machining center to ensure the processing accuracy, and the processed cutting tooth base is subjected to vacuum furnace tempering treatment.

[0034] S2. Diamond micro powder mixed powder and cemented carbide base are grown at 1500°C and 90500 atmospheres. Specifically, due to the different materials and different shrinkage ratios, the larger the volume, the greater the production difficulty.

[0035] Furthermore, diamond powder is selected in S2, wherein, by weight percentage, diamond accounts for 85%-95%, synthetic medium cobalt and nickel elements account for 5%-15%, and the diamond particle size composition is W1-W40, accounting for 60%-80% by weight.

[0036] S3. The processed pick base, diamond composite teeth and diamond composite sheet wear-resistant column are subjected to sandblasting and decontamination treatment.

[0037] S4. Evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes.

[0038] S5. Apply flux evenly on the bottom plane of the diamond composite tooth, and evenly apply flux on the inner surface of the inlay hole of the pick base. Then put the calculated and weighed silver-based solder into the inlay hole, and finally put the diamond composite tooth.

[0039] Furthermore, the thickness of the silver-based solder in S5 is 0.12 mm.

[0040] S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 490°C-510°C, so that the flux is in a molten state.

[0041] S7. The temperature is raised to 670°C by a medium frequency welding machine to melt the required mass of silver-based solder. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature reaches the welding temperature of 670°C first. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the molten silver-based solder in multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 690°C, the flux and silver-based solder in the inlay hole gradually melt, and the silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the molten silver-based solder is used to fill the gap between the inlay hole and the diamond composite tooth to form a body.

[0042] S8. After the temperature of the heated diamond pick reaches 690° C., the heating device is turned off. After the diamond pick cools down to a temperature lower than 600° C., the diamond pick is kept warm.

[0043] Specifically, in S7, the bottom plane of the diamond composite tooth is inverted, and the bottom surface is horizontally welded to the water droplet-shaped silver-based solder upward. Further, the silver-based solder is melted on the bottom plane of the diamond composite tooth. Due to surface tension, the silver-based solder is in the shape of a water droplet after solidification. The silver-based solder flows to the specified position through the diamond composite tooth due to gravity extrusion.

[0044] Specifically, the silver-based solder in S7 forms a water droplet-shaped solder that melts in coordination with the inlay hole, and the top of the water droplet-shaped solder first contacts the bottom of the inlay hole and melts, which is used to fully expel the gas at the bottom of the inlay hole, ensuring that the solder layer is free of slag inclusions, gas inclusions, and void welds. Furthermore, the self-weight sinking of the diamond composite tooth can effectively expel air from the weld to prevent void welds. Furthermore, the diamond composite tooth is shaken left and right and forward and backward with a special tool to confirm that no bubbles emerge around the weld.

[0045] Furthermore, a cemented carbide substrate and a conical diamond composite layer, and a roughening area is set on the peripheral side of the cemented carbide substrate to increase the bonding force between the diamond composite sheet and other parts of the pick. Furthermore, the depth of the roughening area is 0.01mm-0.20mm, the depth deviation within a single roughening area is 0-0.2mm, and the roughening area on the peripheral side of the cemented carbide substrate can adopt one or more of full-hall distribution, grid distribution, strip distribution or multi-ring distribution.

[0046] Embodiment 1

[0047] A method for processing a diamond pick for hard rock comprises the following steps:

[0048] S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, and open an inlay hole on the top of the pick base. Specifically, the alloy structural steel is 42CrMo. Furthermore, the processed pick base is subjected to vacuum furnace tempering treatment so that the hardness of the pick base is HRC 40.

[0049] S2. Diamond micro powder mixed powder and cemented carbide base are grown at 1500℃ and 100000 atmospheres.

[0050] S3. The processed pick base, diamond composite teeth and diamond composite sheet wear-resistant column are subjected to sandblasting and decontamination treatment.

[0051] S4. Evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes.

[0052] S5. Apply flux evenly on the bottom plane of the diamond composite tooth, and evenly apply flux on the inner surface of the inlay hole of the pick base. Then put the calculated and weighed silver-based solder into the inlay hole, and finally put the diamond composite tooth.

[0053] S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 500°C, making the flux in a molten state.

[0054] S7. The temperature is raised to 670°C by a medium frequency welding machine to melt the required mass of silver-based solder. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature reaches the welding temperature of 670°C first. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the molten silver-based solder in multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 690°C, the flux and silver-based solder in the inlay hole gradually melt, and the silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the molten silver-based solder is used to fill the gap between the inlay hole and the diamond composite tooth to form a body.

[0055] S8. After the temperature of the heated diamond pick reaches 690° C., the heating device is turned off. After the diamond pick cools down to a temperature lower than 600° C., the diamond pick is kept warm.

[0056] Embodiment 2

[0057] A method for processing a diamond pick for hard rock comprises the following steps:

[0058] S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, and open an inlay hole on the top of the pick base. Specifically, the alloy structural steel is 42CrMo. The processed pick base is subjected to vacuum furnace tempering treatment so that the hardness of the pick base is HRC 38.

[0059] S2, diamond micro powder mixed powder and cemented carbide base are grown at 1450℃ and 90500 atmospheres.

[0060] S3. The processed pick base, diamond composite teeth and diamond composite sheet wear-resistant column are subjected to sandblasting and decontamination treatment.

[0061] S4. Evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes.

[0062] S5. Apply flux evenly on the bottom plane of the diamond composite tooth, and evenly apply flux on the inner surface of the inlay hole of the pick base. Then put the calculated and weighed silver-based solder into the inlay hole, and finally put the diamond composite tooth.

[0063] S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 490°C, making the flux in a molten state.

[0064] S7. The temperature is raised to 660℃ by a medium frequency welding machine to melt the required mass of silver-based solder. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature first reaches the welding temperature of 660℃-680℃. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the molten silver-based solder in multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 680℃, the flux and silver-based solder in the inlay hole gradually melt, and the silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the molten silver-based solder is used to fill the gap between the inlay hole and the diamond composite tooth to form a body.

[0065] S8. After the temperature of the heated diamond pick reaches 680° C., the heating device is turned off. After the diamond pick cools down to a temperature lower than 600° C., the diamond pick is kept warm.

[0066] Embodiment 3

[0067] A method for processing a diamond pick for hard rock comprises the following steps:

[0068] S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, and open an inlay hole on the top of the pick base. Specifically, the alloy structural steel is 42CrMoA. The processed pick base is subjected to vacuum furnace tempering treatment so that the hardness of the pick base is HRC 42.

[0069] S2, diamond micro powder mixed powder and cemented carbide base are grown at 1550℃ and 10500 atmospheres.

[0070] S3. The processed pick base, diamond composite teeth and diamond composite sheet wear-resistant column are subjected to sandblasting and decontamination treatment.

[0071] S4. Evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes.

[0072] S5. Apply flux evenly on the bottom plane of the diamond composite tooth, and evenly apply flux on the inner surface of the inlay hole of the pick base. Then put the calculated and weighed silver-based solder into the inlay hole, and finally put the diamond composite tooth.

[0073] S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 510°C, making the flux in a molten state.

[0074] S7. The temperature is raised to 680°C by a medium frequency welding machine to melt the required mass of silver-based solder. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature reaches the welding temperature of 680°C first. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the molten silver-based solder in multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 700°C, the flux and silver-based solder in the inlay hole gradually melt. The silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the gap between the inlay hole and the diamond composite tooth is filled with the molten silver-based solder to form a body.

[0075] S8. After the temperature of the heated diamond pick reaches 700° C., the heating device is turned off. After the diamond pick cools down to a temperature lower than 600° C., the diamond pick is kept warm.

[0076] Table 1 is a comparison of the wear resistance of diamond composite teeth and tungsten carbide wear-resistant layer

[0077]

[0078] It can be seen from the above exemplary experimental data that under the same experimental conditions:

[0079] The wear loss of the diamond composite tooth is 0.0004g, which is significantly lower than the 0.0026g of the tungsten carbide wear-resistant layer.

[0080] Wear ratio comparison: The wear-resistant column of diamond composite sheet is 10.85 times that of tungsten carbide wear-resistant layer;

[0081] Therefore, it can be concluded from the experimental data that under this experimental condition, the wear resistance of the diamond composite tooth is significantly better than that of the tungsten carbide wear-resistant layer, which is mainly attributed to the characteristics of diamond (high wear resistance), which is the hardest natural substance and has a much higher hardness than tungsten carbide.

[0082] The alloy picks and diamond picks were tested as shown in Table 2 and Table 3.

[0083] Table 2:

[0084]

[0085] Table 3:

[0086]

[0087]

[0088] By observing the above table, it can be concluded that adding 0.1-0.15mm silver-based solder has the following advantages:

[0089] 1. Improve wear resistance: Silver-based solder has good fluidity and lubricity, which can effectively reduce the friction and wear between diamond and metal matrix, thus significantly improving the wear resistance of diamond picks. In the simulation data, diamond picks with silver-based solder added performed better in the wear resistance test, and the wear rate was reduced by half.

[0090] 2. Enhanced impact resistance: Silver-based solder forms a strong metallurgical bond with diamond and metal matrix at high temperature, which enhances the overall strength of the pick and improves its impact resistance. In the experiment, the pick with silver-based solder added can withstand more impact times and show stronger durability.

[0091] 3. Improve cutting efficiency: The lubricating effect of silver-based solder reduces the resistance during the cutting process, allowing the diamond pick to cut into the material more smoothly and improve cutting efficiency. Data shows that the cutting efficiency of the pick with the addition of silver-based solder is increased by 50%.

[0092] 4. Extended service life: With improved wear resistance, impact resistance and cutting efficiency, diamond picks with silver-based solder can more effectively resist wear and impact, thus significantly extending their service life. Simulation data predicts that their service life can be doubled.

[0093] 5. Improve bonding strength: Silver-based solder can enhance the bonding strength between diamond and metal matrix, reduce the risk of diamond falling off, and ensure that the pick maintains stable cutting performance during use.

[0094] 6. Process optimization:

[0095] a. Although adding silver-based solder may increase process complexity, the performance improvement it brings is enough to offset this shortcoming. At the same time, by optimizing the solder thickness and sintering process, production costs can be further reduced and production efficiency can be improved.

[0096] In summary, adding silver-based solder (thickness 0.1mm-0.15mm) during the preparation of diamond picks can significantly improve the wear resistance, impact resistance, cutting efficiency and service life of the picks, and is an effective method for preparing high-performance diamond picks.

[0097] The preparation method and performance characteristics of mushroom-shaped diamond picks (or bullet-shaped diamond picks) are verified, as shown in Table 4.

[0098] Table 4:

[0099]

[0100] In the above table, HV represents Vickers hardness.

[0101] From the data, it can be seen that with the increase of temperature (batches 1 to 3), the hardness of the diamond composite teeth increases, but too high a temperature may cause the diamond to undergo graphitization and reduce the hardness. At the same time, appropriate pressure (such as 5.5GPa for batches 1 and 3) helps promote the close bonding of diamond and cemented carbide and improve the overall performance.

[0102] Although the effect of holding time on hardness is not the main variable in this example (the holding time of batches 1 and 3 is the same), the appropriate holding time can ensure that the diamond powder reacts fully with the cemented carbide backing to form a uniform and dense composite structure.

[0103] The samples without cracks (Batch 1 and Batch 3) showed better overall performance and stability, while the samples with microcracks (Batch 2) may be more susceptible to performance degradation or failure during use.

[0104] Through the analysis of the above simulation experimental data charts, we can preliminarily conclude that the hardness of mushroom-shaped (or bullet-shaped) diamond picks prepared under high temperature and high pressure conditions varies with the changes in preparation temperature and pressure, and appropriate synthesis conditions and holding time are essential to obtain high-performance diamond composite teeth.

[0105] Samples without cracks have better performance and stability, and are suitable for applications requiring high wear resistance and strength.

[0106] This specific embodiment is merely an explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of protection of the invention, they are protected by patent law.

Claims

1. A diamond pick for hard rock, characterized in that: include: A pick base, wherein an inlay hole is provided on the top of the pick base, an easy-to-wear area is provided on the upper part of the pick base, a plurality of columnar holes are provided at equal intervals along the circumferential direction of the easy-to-wear area, and diamond composite sheet wear-resistant columns are welded in the plurality of columnar holes; The diamond composite tooth is arranged in the embedding hole at the top of the pick base.

2. The diamond pick according to claim 1, characterized in that: The diamond composite teeth are divided into two types: bullet-shaped diamond composite teeth and mushroom-shaped diamond composite teeth.

3. The diamond pick according to claim 1, characterized in that: The circumference of the wear-resistant column of the diamond composite sheet is processed with clearance matching with the inner diameter of the columnar hole, and the number of the wear-resistant column of the diamond composite sheet is equal to the number of the columnar holes.

4. The diamond pick according to claim 1, characterized in that: A damping groove is provided at the waist of the pick base, and the damping groove is arranged along the circumferential direction of the pick base. A retaining spring groove is provided at the tooth handle below the pick base.

5. A method for processing a diamond pick for hard rock, characterized in that: The diamond pick processing method comprises the following steps: S1. Select high-quality alloy structural steel to make the pick base, open columnar holes on the surface of the pick base, open an inlay hole on the top of the pick base, and perform vacuum furnace quenching and tempering treatment on the processed pick base so that the hardness of the pick base is HRC 38-42; S2, growing diamond micro powder mixed powder and cemented carbide base at 1450°C-1550°C and 90500-10500 atmospheres; S3, performing sandblasting and decontamination treatment on the processed pick base, diamond composite teeth, and diamond composite sheet wear-resistant columns; S4, evenly apply solder paste to the multiple columnar holes of the prepared pick base, add silver-based solder, and place multiple diamond composite sheet wear-resistant columns into the multiple columnar holes; S5, evenly apply flux on the bottom plane of the diamond composite tooth, evenly apply flux on the inner surface of the inlay hole of the pick base, then put the formed silver-based solder into the inlay hole, and finally put the diamond composite tooth; S6. Heat the base of the pick by a medium frequency welding machine so that the surface temperature of the embedded hole reaches 490°C-510°C, so that the flux is in a molten state; S7. The temperature is raised to 660℃-680℃ by a medium frequency welding machine to melt the silver-based solder of the required mass. Since the wear-resistant column of the diamond composite sheet is close to the heating ring, the temperature reaches the welding temperature of 660℃-680℃ first. The molten solder paste guides the silver-based solder to flow. The diamond composite sheet and the pick base are welded into one body through the melted silver-based solder in the multiple columnar holes. At the same time, when the diamond composite tooth is continued to be heated to 680℃-700℃, the flux and silver-based solder in the inlay hole gradually melt, and the silver-based solder melts on the bottom plane of the diamond composite tooth. After melting, the flux guides the silver-based solder to flow, and the melted silver-based solder is used to fill the gap between the inlay hole and the diamond composite tooth to form a body; S8. After the temperature of the heated diamond pick reaches 680-700°C, the heating device is turned off. After the diamond pick cools down to a temperature lower than 600°C, the diamond pick is kept warm.

6. The diamond pick according to claim 5, characterized in that: Diamond micro powder is selected from S2; wherein, by weight percentage, the diamond accounts for 85%-95%, and the synthetic medium cobalt and nickel single substances account for 5%-15%.

7. The diamond pick according to claim 5, characterized in that: The depth of the columnar hole in S1 is 7mm-9mm, and the depth of the inlay hole is 19mm-25mm.

8. The diamond pick according to claim 5, characterized in that: The thickness of the silver-based solder in the S5 is 0.1 mm-0.15 mm.

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