A diamond glass drill bit, a mold for producing a diamond glass drill bit, and a method

Abstract

The present application belongs to the technical field of diamond drill bit processing, and particularly relates to a diamond glass drill bit, a mold for producing the diamond glass drill bit, and a method for producing the diamond glass drill bit, comprising a frame, a plurality of mold units, and a plurality of support assemblies. The plurality of mold units are installed in the frame, and the plurality of support assemblies are correspondingly arranged with the plurality of mold units. The support assemblies are used for positioning and supporting the drill bit base. The mold units are designed in a modular manner. When a single mold unit is worn, it can be replaced alone, without scrapping the entire mold, thereby greatly reducing the mold maintenance cost. The mold structure is suitable for producing diamond glass drill bits of different specifications, and can be applied to the manufacturing of small diamond-embedded diamond cutters such as diamond ceramic drill bits, diamond jade drill bits, etc., and has strong adaptability and high industrial promotion value. The automatic pre-pressing forming replaces manual powder filling, completely solves the dust pollution problem of manual powder filling, improves the production operation environment, and meets the environmental protection and occupational health standards of industrial production.

Description

Technical Field

[0001] This invention belongs to the field of diamond drill bit processing technology, specifically relating to a diamond glass drill bit, a mold for producing diamond glass drill bits, and a method thereof. Background Technology

[0002] Diamond glass drill bits are core cutting tools in the deep processing of glass in fields such as architectural decoration, home appliance manufacturing, and electronic optics. Due to the high brittleness and high hardness of glass, extremely high requirements are placed on the dimensional accuracy, coaxiality, and uniformity of the diamond working layer of the drill bit. Hot pressing sintering is currently the mainstream manufacturing method for diamond glass drill bits. Its core principle is to densify the metal matrix powder through high temperature and high pressure, firmly embedding diamond particles into the drill bit base head, and realizing the integrated molding of the drill bit base and the diamond working layer.

[0003] However, in the large-scale production of diamond glass drill bits, existing technologies have many core defects that cannot be overcome: Firstly, manual powder filling is extremely inefficient and results in very poor product consistency: the powder filling of the diamond working layer relies entirely on manual operation. Workers need to fill the mixed powder into the grooves of a disposable mold and achieve powder compaction through repeated operations of "pressing-flipping-pressing again." Powder filling for a single drill bit is time-consuming and inefficient. Furthermore, the powder density and filling amount depend entirely on the worker's experience, with no uniform standard, resulting in uneven density and large thickness deviations in the diamond working layer. This leads to drastic fluctuations in drill bit processing accuracy and service life, with the industry average yield rate being only around 70%. At the same time, manual powder filling easily generates dust pollution, which does not meet the environmental protection requirements and occupational health standards of industrial production. Secondly, the high cost of molds leads to one-time wear and tear and high production costs. Existing processes generally use disposable round molds made of graphite or ceramic. After each drill bit is sintered, the workpiece can only be removed by hammering and breaking the mold. The mold is completely scrapped and cannot be reused. The cost of mold consumables accounts for a very high proportion of the cost of a single product. At the same time, the broken mold generates a large amount of industrial solid waste, which is a serious waste of resources and does not conform to the trend of green manufacturing development. Third, the inability to achieve mass production and scaled efficiency improvement has encountered bottlenecks: traditional molds can only achieve single-piece or 2-4-piece extremely small batch production, which cannot be connected with automated production lines, making it difficult to improve production efficiency; moreover, the demolding method of breaking the mold is prone to damage to the drill bit, further increasing production losses, becoming the core barrier to improving efficiency and reducing costs in the industry.

[0004] Existing improvements to diamond drill bit manufacturing processes primarily focus on optimizing sintering parameters. For example, patent CN103084574B discloses a method for preparing diamond drill bits and its sintering apparatus, which shortens the manufacturing cycle and reduces energy consumption through variable medium-frequency sintering and bidirectional vibration compression. However, such improvements only focus on energy control during the sintering process and completely fail to address the industry's core pain points of "manual powder filling" and "disposable molds," thus failing to fundamentally solve the efficiency, cost, and quality issues in glass drill bit production. A few related technologies for reusable molds are mostly designed for large-size geological exploration drill bits, which are complex in structure and large in size, unable to meet the molding requirements of small, thin-walled, and high-precision glass drill bits. The technical problems of coaxiality control and multi-cavity batch production have not been effectively solved.

[0005] Therefore, the industry urgently needs a special mold and supporting method that can completely replace manual powder filling, enable high-frequency reuse of molds, adapt to the mass production of small high-precision glass drill bits, and ensure product quality stability, so as to break through existing technical bottlenecks and promote industry upgrading. Summary of the Invention

[0006] This invention addresses the technical problems existing in the prior art by providing a diamond glass drill bit, a mold for producing diamond glass drill bits, and a method thereof. The core innovation is a reusable and combinable mold, which is complemented by a diamond ring pre-compression molding process and a graphite coaxial positioning scheme. This constructs an integrated technical system of "reusable mold + automated powder pre-forming + high-precision coaxial positioning", which completely solves the core problems of low efficiency of manual powder filling, high mold wear, poor product consistency, and inability to mass produce in the prior art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a mold for producing diamond glass drill bits, comprising a frame, multiple sets of mold units, and multiple sets of support components. The multiple sets of mold units are installed in the frame, and the multiple sets of support components are arranged correspondingly to the multiple sets of mold units. The support components are used to position and support the drill bit base.

[0008] Preferably, several first screw holes are opened on one side of the frame, and first bolts are installed in the internal threads of the first screw holes.

[0009] Preferably, the rear end of the frame has several second screw holes, and the second screw holes are threaded together to accommodate second bolts.

[0010] Preferably, the mold unit includes two fixing blocks, and a set of arc-shaped grooves is formed on the opposite surfaces of the two fixing blocks. Each set of arc-shaped grooves is composed of several arc-shaped grooves, and the upper and lower ends of the arc-shaped grooves are connected to the outside.

[0011] Preferably, the support assembly includes a support head and a support rod, with one end of the support rod fixedly connected to one end of the support head, the support rod and the support head being placed concentrically, and the diameter of the support head being larger than the diameter of the support rod.

[0012] Preferably, the support head and support rod are both made of graphite material.

[0013] A method for producing diamond drill bits, characterized in that the processing step using the mold for producing diamond drill bits comprises: Step 1: Prefabrication of diamond material rings Diamond particles are mixed evenly with metal binder powder and pressed into a material ring of a preset size by a powder forming machine, which serves as a preform of the cutting working layer of the diamond glass drill bit. Step 2: Mold Assembly and Fixing a. Place multiple sets of mold units inside the frame, rotate the first bolt, and use the steel plate to laterally press and fit the multiple sets of mold units together, so that the outermost mold unit fits against the inner wall of the frame. b. Rotate the second bolt to tighten the rear ends of multiple mold units through the steel plate, so that the front end of the mold unit fits against the inner wall of the front end of the frame, thus completing the bidirectional positioning and fastening of the mold unit within the frame. Step 3: Pre-install the support components and diamond material ring a. Place the prefabricated diamond material ring onto the support rod of the support component to form a support component-diamond material ring pre-assembly; b. Insert the support component - diamond material ring pre-assembled body into the cylindrical hole formed by the arc grooves of two fixing blocks; c. Insert the drill bit body into the cylindrical hole, so that the inner wall of the diamond material ring fits into the outer wall of the drill bit body, and the diamond material ring is sleeved on the outside of the drill bit body. At the same time, the support rod is inserted into the drill bit body, and one end of the support head contacts the end of the drill bit body to achieve coaxial positioning and axial support; Step 4: Hot pressing and sintering. The assembled mold is placed in a hot pressing and sintering machine and hot pressing and sintering is carried out in a vacuum environment to firmly bond the diamond material ring to the drill bit matrix. Step 5: Cooling and Demolding After sintering, the mold is cooled to room temperature. The first and second bolts are loosened, the mold unit is opened, and the finished drill bit with support components is taken out. Step Six: Separation and Removal of Support Components The drill bit body is gently tapped to break and separate the support rod from the support head; the support rod remaining inside the drill bit body is removed and cleaned by drilling rig, and finally a diamond glass drill bit is obtained, which is formed by the combination of the drill bit body and the diamond material ring. Step 7: Mold Cleaning and Reuse The frame, mold unit, steel plate, and support head are cleaned, inspected, and reassembled after confirmation of their integrity for use in the production of the next batch of diamond drill bits.

[0014] Preferably, in step one, the diamond particles have a particle size of 30 / 40 mesh to 50 / 60 mesh, and the mass ratio of diamond particles to metal binder powder is 2:8 to 4:6. The metal binder is one or more of copper-based alloy powder, cobalt powder, or bronze powder. The pre-pressing pressure of the powder molding machine is 100-300 MPa, and the dimensional tolerance of the diamond material ring is controlled within ±0.05 mm.

[0015] Preferably, in step four, the process parameters for hot pressing sintering are: sintering temperature 700-850℃, sintering pressure 10-20MPa, holding time 3-8min, and nitrogen purity ≥99.99%.

[0016] A diamond glass drill bit, characterized in that it is prepared by the aforementioned method for producing diamond glass drill bits, wherein the diamond cutting working layer of the drill bit is integrally formed by hot pressing and sintering a pre-formed diamond material ring with the drill bit matrix, and the density deviation of the diamond working layer is ≤0.02g / cm³, the thickness deviation is ≤0.03mm, and the coaxiality of the drill bit is ≤0.02mm.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are as follows: (1) The mold is reusable and the production cost is greatly reduced: The mold adopts a frame and detachable mold unit combination structure. The mold unit is detachable and fixed by the first bolt and the second bolt. After the drill is formed and cooled, the demolding can be completed by simply loosening the bolt and disassembling the mold unit. There is no need to break the mold. After cleaning and inspection, the mold can be reused ≥200 times, which completely solves the problem of single use and large consumption of molds in the existing technology. The mold cost of a single product is reduced by ≥99%, which greatly reduces the cost of mold consumables and reduces the generation of industrial solid waste, which is in line with the concept of green manufacturing. (2) Automated preforming replaces manual powder filling, revolutionizing production efficiency: This technology uses a powder forming machine to pre-press diamond rings, replacing the manual powder filling method in the existing technology. This effectively solves the problems of fine glass drill bit hole walls, difficulty in manual powder filling, and uneven material loading, improving powder filling efficiency by ≥300%. A single mold can achieve batch sintering of 16 pieces or more, and the overall production efficiency is ≥50 times higher than the traditional single-piece process. Moreover, the clamping and demolding operations are simple and can be directly connected to automated production lines, adapting to the needs of large-scale industrial production. (3) Precise coaxial positioning significantly improves product accuracy and consistency: The pre-pressed diamond ring has precise dimensions and uniform density. With the coaxial positioning of the high-purity graphite support components, the coaxiality of the drill bit can be controlled within ≤0.02mm, and the thickness deviation of the diamond working layer is ≤0.03mm. The CNC-machined mold cavity has good consistency in size, which fundamentally eliminates the randomness of manual operation. The product yield rate has increased from 70% in the traditional process to over 98%. The service life of the drill bit fluctuates little, and the quality stability is excellent, fully meeting the high-precision drilling requirements of glass. (4) Low-temperature protective atmosphere sintering to ensure the cutting performance of the drill bit: This method adopts a low-temperature nitrogen protective sintering process at 800-850℃, which can effectively avoid high-temperature oxidation and thermal damage of diamond particles, ensure the hardness and cutting performance of diamond particles, and at the same time ensure the bonding strength between the metal binder and the drill bit matrix, further improving the service life and processing stability of diamond glass drill bits. (5) The mold has a simple structure, strong maintainability, and wide applicability: The mold unit adopts a modular design, and a single mold unit can be replaced individually when it is worn, without scrapping the entire mold, which greatly reduces the mold maintenance cost; The mold structure is suitable for the production of diamond glass drill bits of different specifications. Only the mold unit with the corresponding cavity size needs to be replaced. At the same time, it can be promoted and applied to the manufacturing of small impregnated diamond tools such as diamond ceramic drill bits and diamond jade drill bits. It has strong adaptability and has extremely high industrial promotion value. (6) The production environment is more environmentally friendly and meets occupational health requirements: Automated pre-pressing replaces manual powder filling, completely solving the dust pollution problem of manual powder filling, improving the production and operation environment, and meeting the environmental protection and occupational health standards of industrial production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below: Figure 1 This is a schematic diagram of the mold structure. Figure 1 ; Figure 2 This is a schematic diagram of the mold structure. Figure 2 ; Figure 3 This is a schematic diagram of the mold structure. Figure 3 ; Figure 4 This is a schematic diagram of the mold structure. Figure 4 ; Figure 5 This is a schematic diagram of the mold's structure from a bottom view. Figure 6 This is an enlarged structural diagram of the supporting components; Explanation of reference numerals in the attached figures: 1. Frame; 2. First bolt; 3. Second bolt; 4. Fixing block; 5. Arc-shaped groove assembly; 6. Support head; 7. Support rod. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1 The following is combined Figures 1-6 A further description of a mold for producing diamond drill bits in Example 1 is provided, such as... Figure 1 As shown, it includes a frame 1, 8 sets of mold units, and 16 sets of support components. The 8 sets of mold units are installed inside the frame 1, and the 16 sets of support components are set in correspondence with the 8 sets of mold units. The support components are used to position and support the drill bit base.

[0022] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the drill bit base is a hollow 45# steel drill bit base. The frame 1 is preferably a rectangular closed integrated steel frame, made of 45# steel, with an inner cavity size of 200mm×150mm×80mm. It has strong structural rigidity and is not easily deformed at high temperatures. The components in the mold unit cooperate to form a forming cavity. The mold unit is installed on the frame 1 and fixed. The prefabricated material is inserted into the forming cavity. The drill bit base is positioned by the support component and inserted into the forming cavity. It is sent to the equipment for processing. After cooling, it is demolded and removed. After cleaning, it can be reused. The prefabricated material is the diamond material ring preform mentioned in the subsequent steps, which is made by mixing and molding diamond particles and metal binder powder. It serves as a semi-finished product of the cutting working layer of the diamond glass drill bit.

[0023] like Figure 1 , Figure 2 , Figure 5 As shown, several first screw holes are opened on one side of the frame 1, and first bolts 2 are installed in the internal threads of the first screw holes.

[0024] Multiple mold units are placed inside frame 1, and then the first bolt 2 is rotated. The bolt head of the first bolt 2 contacts the outer wall of one of the mold units, and the eight mold units are pressed together. That is, the eight mold units are fitted together, and the outer wall of the outermost mold unit is fitted to the inner wall of the other side of frame 1, thus fixing the multiple mold units inside frame 1. When the bolt head of the first bolt 2 contacts the outer wall of one mold unit, a steel plate can also be added between the bolt head of the first bolt 2 and the outer wall of the mold unit. The steel plate is made of Q235 carbon steel with a thickness of 10mm. The steel plate prevents the bolt head from damaging the mold unit, and also enhances the stability of the tightening, ensuring that all mold units are subjected to uniform force.

[0025] like Figure 4 As shown, several second screw holes are opened at the rear end of the frame 1, and second bolts 3 are installed in the internal threads of the second screw holes.

[0026] After multiple sets of mold units are installed inside frame 1, the second bolt 3 is rotated to screw it into the inside of frame 1. A steel plate is also placed between the rear end of the multiple sets of mold units and the bolt head of the second bolt 3, with the plate centered and covering the rear end of all mold units. The edge of the steel plate is in contact with the inner wall of frame 1 to ensure that the multiple sets of mold units are arranged neatly and the force is evenly distributed. The steel plate arranges the multiple sets of mold units neatly, so that the front end of the mold unit is in contact with the front inner wall of frame 1. The bolt head of the second bolt 3 contacts the rear end of the steel plate, and the front end of the steel plate is in contact with the rear end of the mold unit. With the assistance of the second bolt 3, the mold units can be installed more stably and firmly inside frame 1.

[0027] like Figure 2 As shown, the mold unit includes two fixing blocks 4, and a set of arc-shaped grooves 5 are respectively opened on the opposite surfaces of the two fixing blocks 4. Each set of arc-shaped grooves 5 is composed of several arc-shaped grooves, and the upper and lower ends of the arc-shaped grooves are connected to the outside.

[0028] Two arc grooves in each group of arc grooves 5 are arranged sequentially along the front and back direction of the frame. The fixing block 4 is made of H13 hot work die steel and is precision machined by CNC machining center. The form and position tolerance of the fixing block 4 is ≤0.005mm, the surface roughness Ra≤0.8μm, and it has high temperature resistance and strong deformation resistance. After the two fixing blocks 4 are attached, the two opposite arc grooves form a φ12.5mm cylindrical hole (i.e., forming cavity). The upper and lower ends of the cylindrical hole are connected to the outside. Eight sets of mold units are used, and the eight sets of mold units form a total of 16 forming cavities in a 4×4 matrix arrangement. The support components, material rings, and drill bit bases can be placed into the cylindrical holes. One drill bit base is matched with one cylindrical hole, and 16 φ12mm diamond glass drill bits can be processed at one time. The opposite surfaces of the two fixed blocks are the mating surfaces of the two fixed blocks. The mating surfaces of the two fixed blocks 4 are provided with a guide positioning structure. The guide positioning structure includes two φ6mm positioning pins on the mating surface of one of the fixed blocks and a matching positioning groove on the mating surface of the other fixed block. The positioning pins and the positioning groove are in transition fit with a fit clearance of ≤0.01mm to ensure the alignment accuracy when the two fixed blocks are closed, avoid misalignment of the forming cavity, and ensure the forming quality of the drill bit.

[0029] like Figure 6 As shown, the support assembly includes a support head 6 and a support rod 7. One end of the support rod 7 is fixedly connected to one end of the support head 6. The support rod 7 and the support head 6 are placed concentrically, and the diameter of the support head 6 is larger than the diameter of the support rod 7.

[0030] The support head 6 and support rod 7 are integrally machined. The outer diameter of the support rod 7 is 7.9mm and the length is 10mm. The outer diameter of the support head 6 is 12.5mm and the thickness is 3mm. The clearance between the support rod 7 and the drill bit base with an inner hole of φ8mm is 0.1mm, ensuring precise positioning and smooth assembly. The clearance between the outer diameter of the support rod 7 and the inner hole of the drill bit base is 0.05-0.15mm.

[0031] Install the fixing block 4 into the frame 1, and fix the fixing block 4 with the first bolt 2 and the second bolt 3 through the steel plate. Place the pre-made diamond material ring onto the support rod 7. Then, place the support head 6, support rod 7, and diamond material ring into the cylindrical hole formed by the two arc-shaped grooves. Next, insert the machined and hollow drill bit body into the cylindrical hole. The inner wall of the diamond material ring fits into the outer wall of the drill bit body, i.e., the diamond material ring is fitted onto the outside of the drill bit body. Simultaneously, the support rod 7 is inserted into the interior of the drill bit body, with the outer wall of the support rod 7 contacting the inner wall of the drill bit body. One end of the support head 6 contacts one end of the drill bit base. The entire component is placed in a hot press sintering machine for sintering. After sintering, the diamond material ring is fixedly installed on the drill bit base. The drill bit base is removed from the mold unit. By gently tapping the drill bit base or other methods, the support rod 7 is broken and separated from the support head 6. The support rod 7 is located in the drill bit base. By using a drilling machine or other equipment, the support rod 7 is crushed from the drill bit base, thus separating the support rod 7 from the drill bit base. Finally, the remaining drill bit base and diamond material ring are combined into one piece, completing the processing of the diamond drill bit.

[0032] like Figure 6 As shown, the support head 6 and support rod 7 are both made of graphite material.

[0033] The graphite used is high-purity graphite, which can withstand the high-temperature environment of hot pressing and sintering. It does not melt, deform, or chemically react with the drill bit matrix at the sintering temperature, ensuring stable and reliable support positioning. Graphite has natural lubricity, allowing the support rod 7 to be smoothly inserted into the drill bit matrix during assembly. It is also easy to break and remove after sintering, reducing assembly and demolding difficulties. Graphite has a low coefficient of thermal expansion and minimal deformation at high temperatures, ensuring the coaxiality and positional accuracy of the drill bit matrix and the diamond ring during the sintering process. Graphite is easy to machine, allowing for precise fabrication of support head and support rod structures. Its low material cost makes it suitable for mass production and single-use, significantly reducing production costs. After the support rod 7 breaks, it can be easily crushed and removed by the drilling machine, leaving no metal impurities in the drill bit matrix and ensuring the quality of the finished drill bit.

[0034] A method for producing diamond glass drill bits, implemented using the aforementioned mold, comprises the following steps: Step 1: Pre-forming of diamond rings 40 / 50 mesh diamond particles and copper-tin bronze powder (90% copper, 10% tin) are mixed at a mass ratio of 3:7 and stirred for 30 minutes using a three-dimensional mixer until uniformly mixed. The mixed powder is then fed into a powder molding machine and pressed into diamond material rings with an inner diameter of 8 mm, an outer diameter of 12 mm, and a thickness of 2 mm under a pressure of 200 MPa. The dimensional tolerance is ±0.03 mm, the density is 5.2 g / cm³, and the density deviation is ≤0.02 g / cm³, ensuring uniform size and density of the diamond working layer.

[0035] Step 2: Mold Assembly and Fixing a. Place the 8 sets of mold units inside the frame 1, rotate the first bolt 2, and use the steel plate to push the 8 sets of mold units laterally and make them fit together, so that the outermost mold unit fits against the inner wall of the frame 1. b. Rotate the second bolt 3 to tighten the rear ends of multiple mold units through the steel plate, so that the front end of the mold unit is in contact with the inner wall of the front end of the frame 1, thus completing the bidirectional positioning and fastening of the mold unit in the frame 1; the steel plate is a rigid steel plate, which is Q235 carbon steel plate with a thickness of 8-12mm. Step 3: Pre-install the support components and diamond material ring a. The prefabricated diamond material ring 8 is fitted onto the support rod 7 of the support component to form a support component-diamond material ring pre-assembly; b. Insert into the molding cavity: Place the support component - diamond material ring pre-assembled body into the cylindrical hole formed by the arc grooves of two fixing blocks 4; c. Inserting the drill bit body: Insert the hollow drill bit body into the cylindrical hole, so that the inner wall of the diamond material ring fits with the outer wall of the drill bit body, and the diamond material ring is sleeved on the outside of the drill bit body head; at the same time, the support rod 7 is inserted into the drill bit body, and one end of the support head 6 contacts the end of the drill bit body to achieve coaxial positioning and axial support. Step 4: Hot pressing and sintering The assembled mold is placed in a hot press sintering machine, and after being evacuated to ≤10Pa, nitrogen gas with a purity of ≥99.99% is introduced as a protective atmosphere to avoid oxidation contamination. The temperature is raised to 820℃ at a rate of 10℃ / min, and an axial sintering pressure of 15MPa is applied. The temperature and pressure are held for 5 minutes to melt and densify the bronze powder, firmly embedding the diamond particles and integrating them with the drill bit matrix. Step 5: Cooling and Demolding After sintering, the mold is naturally cooled to 40°C in the furnace. The first bolt 2 and the second bolt 3 are loosened, the fixing block 4 of the mold unit is disassembled, and the finished drill bit with the support components is taken out. The cooling method is natural cooling in the furnace. After cooling to room temperature ≤50°C, the demolding operation is performed. Step Six: Separation and Removal of Support Components The support rod 7 is gently tapped to break and separate from the support head 6. The support rod 7 remaining inside the drill bit body is drilled out and cleaned using a small drilling machine to remove the surface sintering residue, and finally a φ12mm diamond glass drill bit is obtained. Step 7: Mold Cleaning and Reuse Clean the frame 1, mold unit fixing block 4, and rigid steel plate with compressed air. After checking for deformation and damage, reassemble them and use them directly for the production of the next batch of diamond glass drill bits.

[0036] The diamond glass drill bit prepared in this embodiment has a coaxiality of ≤0.02mm, a diamond working layer thickness deviation of ≤0.03mm, a product performance deviation of ≤2% within a batch, and a yield rate of 98.5%. After 200 cycles of use, the mold cavity size deviation is ≤0.01mm and it can still be used normally, demonstrating excellent stability.

[0037] In step one, the diamond particles have a particle size of 30 / 40 mesh to 50 / 60 mesh, and the mass ratio of diamond particles to metal binder powder is 2:8 to 4:6. The metal binder is one or more of copper-based alloy powder, cobalt powder, or bronze powder. The pre-pressing pressure of the powder molding machine is 100-300 MPa, and the dimensional tolerance of the diamond ring is controlled within ±0.05 mm.

[0038] In step four, the process parameters for hot pressing sintering are: sintering temperature 700-850℃, sintering pressure 10-20MPa, holding time 3-8min, and nitrogen purity ≥99.99%.

[0039] Example 2 This embodiment provides a method for producing high-hardness tempered glass drill bits, the difference being: The mold is set with 12 mold units. Each mold unit has two φ6.5mm arc grooves, forming a total of 24 φ6.5mm closed column cavities arranged in a 6×4 matrix. It can process 24 φ6mm tempered glass special drill bits at one time. The outer diameter of the support rod 7 of the support assembly is 3.95mm, and the clearance between it and the drill bit base with the φ4mm inner hole is 0.05mm, resulting in higher positioning accuracy. Diamond material ring pre-compression molding: 50 / 60 mesh diamond particles and cobalt powder are mixed at a mass ratio of 2:8, the pre-compression pressure is 300MPa, the diamond material ring has an inner diameter of 4mm, an outer diameter of 6mm, and a thickness of 2mm. Hot pressing sintering parameters: sintering temperature 850℃, sintering pressure 20MPa, holding temperature and pressure for 3min.

[0040] The φ6mm tempered glass-specific drill bit prepared in this embodiment has a bonding strength between the diamond working layer and the drill bit matrix of ≥320MPa, enabling continuous and stable drilling of tempered glass. Its service life is increased by more than 40% compared with traditional process drill bits, making it suitable for the deep processing needs of high-hardness tempered glass.

[0041] Example 3 This embodiment provides a method for producing high-precision drill bits for thin-walled optical glass, the difference being: The mold is set with 16 mold units. Each mold unit has two arc grooves with a diameter of 20.5mm, forming a total of 32 closed column cavities with a diameter of 20.5mm. They are arranged in a circular-matrix composite array and can process 32 φ20mm optical glass special drill bits at one time. The outer diameter of the support rod 7 of the support assembly is 11.85mm, and the clearance between it and the drill bit base with the φ12mm inner hole is 0.15mm, making assembly smoother. Diamond ring pre-compression molding: 30 / 40 mesh diamond particles and copper-based alloy powder are mixed at a mass ratio of 4:6, the pre-compression pressure is 100MPa, the diamond ring has an inner diameter of 12mm, an outer diameter of 20mm, and a thickness of 3mm. Hot pressing sintering parameters: sintering temperature 800℃, sintering pressure 10MPa, holding temperature and pressure for 8min.

[0042] The φ20mm optical glass-specific drill bit prepared in this embodiment has a drilling edge chipping amount of ≤0.1mm, which fully meets the high-precision processing requirements of thin-walled optical glass and can be widely used in the deep processing of glass in the field of electronic optics.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A mold for producing diamond glass drill bits, characterized in that, It includes a frame (1), multiple sets of mold units, and multiple sets of support components. The multiple sets of mold units are installed inside the frame (1), and the multiple sets of support components are set in correspondence with the multiple sets of mold units. The support components are used to position and support the drill bit base.

2. The mold for producing diamond glass drill bits according to claim 1, characterized in that, Several first screw holes are opened on one side of the frame (1), and first bolts (2) are installed in the internal threads of the first screw holes.

3. The mold for producing diamond glass drill bits according to claim 2, characterized in that, The rear end of the frame (1) has several second screw holes, and the second screw holes are fitted with second bolts (3) by internal thread.

4. The mold for producing diamond glass drill bits according to claim 3, characterized in that, The mold unit includes two fixed blocks (4), and a set of arc-shaped grooves (5) are respectively opened on the opposite surfaces of the two fixed blocks (4). Each set of arc-shaped grooves (5) consists of several arc-shaped grooves, and the upper and lower ends of the arc-shaped grooves are connected to the outside.

5. A mold for producing diamond glass drill bits according to claim 4, characterized in that, The support assembly includes a support head (6) and a support rod (7). One end of the support rod (7) is fixedly connected to one end of the support head (6). The support rod (7) and the support head (6) are placed concentrically. The diameter of the support head (6) is larger than the diameter of the support rod (7).

6. The mold for producing diamond glass drill bits according to claim 5, characterized in that, The support head (6) and support rod (7) are both made of graphite material.

7. A method for producing diamond glass drill bits, characterized in that, The steps for processing using the mold for producing diamond drill bits as described in claim 6 are as follows: Step 1: Prefabrication of diamond material rings Diamond particles are mixed evenly with metal binder powder and pressed into diamond material rings of a preset size using a powder forming machine, which serve as preforms for the cutting working layer of diamond glass drill bits. Step 2: Mold Assembly and Fixing a. Place multiple sets of mold units inside the frame (1), rotate the first bolt (2), and use the steel plate to press the multiple sets of mold units laterally and fit them together, so that the outermost mold unit fits against the inner wall of the frame (1); b. Rotate the second bolt (3) to press the rear end of multiple mold units against the steel plate, so that the front end of the mold unit is in contact with the inner wall of the front end of the frame (1), thus completing the bidirectional positioning and fastening of the mold unit in the frame (1); Step 3: Pre-assemble support components and material rings a. Place the pre-made diamond material ring onto the support rod (7) of the support component to form a support component-diamond material ring pre-assembly; b. Insert the support component - diamond material ring pre-assembled body into the cylindrical hole formed by the arc groove of two fixing blocks (4); c. Insert the drill bit body into the cylindrical hole, so that the inner wall of the diamond material ring fits into the outer wall of the drill bit body, and the diamond material ring is sleeved on the outside of the drill bit body. At the same time, the support rod (7) is inserted into the drill bit body, and one end of the support head (6) contacts the end of the drill bit body to achieve coaxial positioning and axial support; Step 4: Hot pressing and sintering The assembled mold is placed in a hot press sintering machine and hot press sintered in a vacuum environment to firmly bond the diamond material ring to the drill bit matrix. Step 5: Cooling and Demolding After sintering, the mold is cooled to room temperature. The first bolt (2) and the second bolt (3) are loosened, the mold unit is opened, and the finished drill bit with support components is taken out. Step Six: Separation and Removal of Support Components The drill bit body is gently tapped to break and separate the support rod (7) from the support head (6); the support rod (7) remaining inside the drill bit rod is drilled out and cleaned by the drilling machine, and finally a diamond glass drill bit is obtained by combining the drill bit body with a diamond material ring. Step 7: Mold Cleaning and Reuse The frame (1), mold unit, steel plate and support head (6) are cleaned, inspected and confirmed to be intact, and then reassembled for the production of the next batch of diamond drill bits.

8. A method for producing diamond glass drill bits according to claim 7, characterized in that, In step one, the diamond particles have a particle size of 30 / 40 mesh to 50 / 60 mesh, and the mass ratio of diamond particles to metal binder powder is 2:8 to 4:

6. The metal binder is one or more of copper-based alloy powder, cobalt powder, or bronze powder. The pre-pressing pressure of the powder molding machine is 100-300 MPa, and the dimensional tolerance of the diamond material ring is controlled within ±0.05 mm.

9. A method for producing diamond glass drill bits according to claim 8, characterized in that, In step four, the process parameters for hot pressing sintering are: sintering temperature 700-850℃, sintering pressure 10-20MPa, holding time 3-8min, and nitrogen purity ≥99.99%.

10. A diamond glass drill bit, characterized in that, The diamond glass drill bit is prepared using the method described in claim 9. The diamond cutting working layer of the drill bit is integrally formed by hot pressing and sintering a pre-formed diamond material ring with the drill bit matrix. The density deviation of the diamond working layer is ≤0.02g / cm³, the thickness deviation is ≤0.03mm, and the coaxiality of the drill bit is ≤0.02mm.

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