Roof type diamond drill bit

Abstract

A roof type diamond drill bit comprises a roof type drill bit part and a drilling and cutting main body part, the longitudinal section of a cutter tooth of the roof type drill bit part is of a roof-shaped structure which is gradually reduced in the extending direction from the bottom to the head, and the roof type drill bit part is used for enabling the contact area of the roof type drill bit part to be smaller, so that the roof type drill bit part is not prone to slipping and shifting, and a stable cutting contact surface is provided; one part of the drilling and cutting main body part is connected with the bottom of the roof-shaped drill bit part, the other part of the drilling and cutting main body part is not connected with the roof-shaped drill bit part, and a platform is reserved at the edge of the unconnected part and is used for realizing accurate positioning in the die filling process, and a sintering connecting part is formed between the roof-shaped drill bit part and the drilling and cutting main body part during sintering. According to the technological process, the operation steps are reduced, the die filling difficulty is reduced, the production process is more efficient, the whole production process from cold pressing to sintering can be rapidly completed, and the production efficiency of products is improved.

Description

Technical Field

[0001] This utility model is a roof-type diamond drill bit, belonging to the field of diamond tool manufacturing technology. Background Technology

[0002] Diamond drill bits, as a drilling and cutting tool, require the drill teeth to be welded to the drill bit body during use. They rely on high-speed rotation and continuous downward pressure to achieve drilling and cutting. Conventional diamond drill bit teeth have a rectangular longitudinal section, which is prone to slippage and deviation in the early stages of use. Roof-type drill bits, on the other hand, add a roof structure to the conventional drill bit, resulting in a smaller contact area with the object being drilled. Currently, the commonly used manufacturing process for roof drill bits in the industry is to cold press the drilling and cutting body and the roof part separately, and then sinter them together through a mold.

[0003] The drawback of this method is that the cold pressing process is cumbersome and the sintering and molding process is quite difficult. Taking the common 24*4.0*12 roof-type ordered drill bit as an example, during production, two 24*10 ordered cold-pressed sheets need to be pressed as the main body of the drill and cutter. Then, the thinner roof part is cold-pressed separately and molded for sintering. Since the roof part cold-pressed sheets are small and fragile, it brings many inconveniences to the molding process. In order to ensure the bonding strength between the roof part and the main body of the drill and cutter, some companies often add an extra mold-closing cold pressing process to press the roof and the main body of the drill and cutter into one piece before molding and sintering. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a roof-type diamond drill bit to solve the problems of the cumbersome manufacturing process and the difficulty of sintering and molding of existing roof drill bits.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a roof-mounted diamond drill bit, comprising:

[0006] A roof-shaped drill head has a cutting tooth longitudinal section that gradually decreases from the bottom to the head in a roof-like structure. This structure is designed to make the contact area of ​​the roof-shaped drill head smaller, thus making it less prone to slippage and providing a stable cutting contact surface.

[0007] The main body of the drilling and cutting part is connected to the bottom of the roof-type drill head, while the other part is not connected to the roof-type drill head and a platform is reserved at the edge of the unconnected part to achieve precise positioning during the mold assembly process.

[0008] The roof-type drill bit and the main body of the drill bit are formed into a whole through a sintering process. During sintering, a sintered connection is formed between the roof-type drill bit and the main body of the drill bit. This sintered connection has good diffusion bonding characteristics, which further enhances the bonding strength between the two and extends the service life of the roof-type diamond drill bit.

[0009] Furthermore, the drilling and cutting main body includes a first main body and a second main body, which are connected by a sintered connection.

[0010] Furthermore, the chip contact surface provided by the roof-type drill bit includes:

[0011] The first cutting contact surface is parallel to the bottom surface of the roof-type drill bit. The width of the first cutting contact surface in the horizontal direction is smaller than the width of the bottom surface of the roof-type drill bit, which is used to provide stable cutting contact.

[0012] The second cutting contact surface has one side connected to the side of the first main body away from the sintered connection part, and the other side connected to the side of the second main body away from the sintered connection part. A platform is reserved at the connection between the second main body and the second cutting contact surface. This platform is used to achieve precise positioning during the mold assembly process, thereby ensuring the flatness and bonding strength of the bottom of the roof-type drill head.

[0013] Furthermore, the second cutting contact surface is at least one of a straight surface or an arc surface, and the first cutting contact surface is at least one of a plane or a sharp corner.

[0014] Furthermore, the second cutting contact surface, viewed from above, is wavy and grooved, wherein the drilling and cutting main body part connected to the groove of the second cutting contact surface is also formed with a corresponding grooved semi-cylindrical shape in the vertical direction.

[0015] Furthermore, when the second cutting contact surface is an arc surface, this arc surface is an outwardly protruding arc surface, which makes the roof-type drill bit have better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

[0016] Furthermore, when the second cutting contact surface is an arc surface, the arc surface is an inwardly concave arc surface, which enhances the cutting edge strength of the roof-type drill bit during the cutting process, while improving chip control and reducing friction and heat accumulation between the chips and the first cutting contact surface.

[0017] Furthermore, the semi-cylindrical grooves on both sides of the drilling and cutting main body can be arranged either oppositely or at intervals to adapt to different cutting requirements and material properties, thereby optimizing heat dissipation performance, chip control, and cutting stability during the cutting process.

[0018] A method for producing a roof-type diamond drill bit, comprising the following steps:

[0019] S1. Preparation steps: According to the size specifications of the roof-type diamond drill bit to be produced, the roof-type diamond drill bit is disassembled into the first pressure plate and the second pressure plate in the thickness direction. The height of the first pressure plate is the total height of the roof-type diamond drill bit including the roof part, and the height of the second pressure plate is the height of the drilling and cutting body. The thickness direction is the direction perpendicular to the extension direction of the longitudinal section of the cutting teeth.

[0020] S2. Cold pressing step: Using a cold pressing mold of appropriate size, the first and second pressing sheets are flattened and formed in the following manner:

[0021] The first pressing plate is formed to include a roof-type drill head and a portion of the drilling body connected to a portion of the bottom of the roof-type drill head;

[0022] This results in the second tablet being formed to include the remaining drilled and cut main body portion;

[0023] S3. Sintering step: Select a suitable sintering mold, stack the first and second pressed sheets along the thickness direction and sinter them. The roof-shaped drill head and the main body of the drill are formed into a whole through the sintering process. During sintering, a sintered connection is formed between the roof-shaped drill head and the main body of the drill.

[0024] S4. Demolding and Inspection Steps: Demolding yields the roof-shaped diamond drill bit, and its quality is inspected according to the quality inspection procedures.

[0025] Furthermore, in the sintering step,

[0026] Before sintering, the first pressing sheet is integrally formed as the first main body of the roof-shaped drill head and the drilling and cutting main body; the second pressing sheet is formed as the second main body of the drilling and cutting main body.

[0027] After sintering, the first main body and the second main body are connected by a sintered connecting part.

[0028] Furthermore, in the preparation step, the first and second pressing sheets are of the same length, and the first and second pressing sheets may have the same or different thicknesses.

[0029] Furthermore, in the sintering step, the sintering mold includes a concave pressure head and a convex pressure head arranged opposite each other. The concave pressure head and the convex pressure head are used to apply pressure to the cold-pressed sheet, so that the cold-pressed sheet is formed during the sintering process. There is a height difference of 0.2 mm between one end of the concave pressure head and its center position, which is used to accurately position the second pressing sheet during mold assembly and avoid its slight displacement.

[0030] Furthermore, in the sintering step, the first and second pressing sheets are stacked along the thickness direction and then flat-pressed for sintering. The selected sintering mold assists in the product forming to obtain the required size and specifications.

[0031] Furthermore, in the sintering step, the mold loading sequence is adjusted according to the size of the sintering mold and the product specifications to ensure that the cold-pressed sheet is uniformly compressed and successfully formed during the sintering process.

[0032] Furthermore, in the sintering step, a temperature gradient control is also provided during the sintering process to uniformly heat the mold and cold-pressed sheet from room temperature to the sintering temperature, thereby avoiding product defects caused by excessive temperature gradient.

[0033] Furthermore, in the demolding inspection step, the demolded roof-type diamond drill bit also needs to undergo quality inspection processes such as appearance inspection, dimensional measurement, hardness testing, and cutting performance testing to ensure that the product quality meets the standard requirements.

[0034] Furthermore, the visual inspection involves visually inspecting the drill bit surface for defects such as cracks, pores, and inclusions using a low-magnification magnifying glass, and checking whether the connection between the roof section and the cutting body is tight and whether there is any delamination or loosening. The dimensional measurement involves using high-precision measuring tools to measure the length, height, and thickness of the drill bit to ensure that it meets the requirements of the design drawings, with different precision requirements for different parts.

[0035] Furthermore, the hardness test is performed on the cutting part and the base part of the drill bit using a hardness tester to ensure that the cutting part has good wear resistance and cutting performance, and the hardness of the base part should be moderate. The cutting performance test is performed by mounting the drill bit on a dedicated cutting test equipment and conducting a cutting test according to the specified cutting parameters, and observing the stability, cutting force, cutting temperature and other performance indicators of the drill bit during the cutting process.

[0036] The beneficial effects of this utility model are:

[0037] 1. This application simplifies the production process by merging the two main cold-pressed sheets and one roof cold-pressed sheet in the conventional process into two cold-pressed sheets of different sizes. These sheets are then directly hot-pressed using a sintering mold, reducing the number of cold-pressed sheets from three to two. The simplified process reduces the number of operation steps and the difficulty of mold assembly, making the production process more efficient and enabling the entire production process from cold pressing to sintering to be completed quickly, thereby improving the production efficiency of the product.

[0038] 2. This application reduces the number of cold-pressed sheets and simplifies the molding process, thereby reducing the labor, material, and time costs in the production process. At the same time, it improves the bonding strength between the roof part and the cutting main body part, reduces the product scrap rate, and further reduces production costs.

[0039] 3. The method provided in this application does not require the production of small and fragile cold-pressed roof sections, which reduces the production difficulty and avoids production problems caused by the fragility of the cold-pressed roof sections. Furthermore, during the sintering process, there is no need to consider the bonding strength of the roof section. The sintering process can be set according to the requirements of the product's optimal performance, thereby further improving the quality and performance of the product. Attached Figure Description

[0040] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0041] Figure 1 The roof-type diamond drill bit produced using the production method of the roof-type diamond drill bit provided by this utility model;

[0042] Figure 2 This is a structural schematic diagram of the roof-type diamond drill bit of this utility model, with a cross section along A-A' (this A-A' section is also called the longitudinal section of the cutting teeth);

[0043] Figure 3 A cross-sectional structural diagram of the roof-type diamond drill bit A in this utility model;

[0044] Figure 4 A cross-sectional structural diagram of the roof-type diamond drill bit B in this utility model;

[0045] Figure 5 A cross-sectional structural diagram of the roof-type diamond drill bit C in this utility model;

[0046] Figure 6 A cross-sectional structural diagram of the roof-type diamond drill bit D in this utility model;

[0047] Figure 7 This is a schematic diagram of a physical object using the roof-type diamond drill bit E in this utility model;

[0048] Figure 8 This is a top view of the diamond drill bit E.

[0049] Figure 9 This is a schematic diagram of the cross-sectional structure of diamond drill bit E.

[0050] The reference numerals in the attached figures are as follows: 100, roof-type drill head; 110, first cutting contact surface; 120, second cutting contact surface; 200, drilling and cutting main body; 210, first main body; 220, second main body; 221, platform; 300, sintered connection part. Detailed Implementation

[0051] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0052] like Figure 1 and Figure 2 As shown, this application provides a roof-mounted diamond drill bit, which includes:

[0053] The roof-type drill head 100 has a roof-shaped structure in which the longitudinal section of the cutting teeth gradually decreases from the bottom to the head, so as to make the contact area of ​​the roof-type drill head 100 smaller, thus making it less prone to slippage and deviation, and providing a stable cutting contact surface.

[0054] The drilling and cutting main body 200 has a part connected to the bottom of the roof-type drill head 100, and another part not connected to the roof-type drill head 100. A platform 221 is reserved at the edge of the unconnected part to achieve precise positioning during the mold assembly process.

[0055] The roof-type drill bit 100 and the drilling and cutting body 200 are formed into a whole through a sintering process. During sintering, a sintered connection part 300 is formed between the roof-type drill bit 100 and the drilling and cutting body 200. The sintered connection part 300 has good diffusion bonding characteristics, which further enhances the bonding strength between the two and extends the service life of the roof-type diamond drill bit.

[0056] To improve the structural stability and service life of the drill bit, the drilling and cutting main body 200 includes a first main body 210 and a second main body 220, which are connected by a sintered connection 300.

[0057] To optimize cutting performance and reduce stress concentration, the chip contact surface provided by the roof-type drill bit 100 includes:

[0058] The first cutting contact surface 110 is parallel to the bottom surface of the roof-type drill head 100. The width of the first cutting contact surface in the horizontal direction is smaller than the width of the bottom surface of the roof-type drill head 100, which is used to provide stable cutting contact.

[0059] The second cutting contact surface 120 has one side connected to the side of the first main body 210 away from the sintered connection part 300, and the other side connected to the side of the second main body away from the sintered connection part 300. A platform 221 is reserved at the connection between the second main body 220 and the second cutting contact surface 120. The platform 221 is used to achieve precise positioning during the mold assembly process, thereby ensuring the flatness and bonding strength of the bottom of the roof-type drill head 100.

[0060] To adapt to different cutting requirements and material properties, the second cutting contact surface 120 is at least one of a straight surface or an arc surface, and the first cutting contact surface 110 is at least one of a plane or a sharp corner.

[0061] In order to optimize cutting performance and adapt to different cutting scenarios, the second cutting contact surface 120 is wavy and grooved when viewed from above. The drilling and cutting main body 200, which is connected to the groove of the second cutting contact surface 120, is also formed with a corresponding groove in the vertical direction, forming a semi-cylindrical shape.

[0062] To improve the guiding performance and cutting accuracy of the drill bit, when the second cutting contact surface 120 is an arc surface, the arc surface is an outwardly protruding arc surface, which makes the roof-type drill head 100 have better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

[0063] In order to enhance the strength of the cutting edge, when the second cutting contact surface 120 is an arc surface, the arc surface is an inwardly concave arc surface, which enhances the strength of the cutting edge of the roof-type drill head 100 during the cutting process, and at the same time improves chip control and reduces the friction and heat accumulation between the chips and the first cutting contact surface 110.

[0064] To accommodate different materials and requirements, the semi-cylindrical grooves on both sides of the drilling and cutting main body 200 can be arranged either oppositely or at intervals to adapt to different cutting requirements and material properties, thereby optimizing heat dissipation performance, chip control and cutting stability during the cutting process.

[0065] The roof-type diamond drill bit provided in this application has a smaller contact area between the roof portion and the object being drilled or cut. This reduces the likelihood of slippage and deviation during use, improving drilling accuracy and stability. The optimized roof structure design makes the roof-type diamond drill bit more efficient during cutting, reducing cutting force and temperature, and extending the drill bit's service life. The use of high-quality diamond composite materials ensures the drill bit's wear resistance and durability in high-intensity cutting operations.

[0066] To improve production efficiency, this invention provides a technical solution for producing roof-type diamond drill bits, which includes the following steps:

[0067] S1. Preparation steps: According to the size specifications of the roof-type diamond drill bit to be produced, the roof-type diamond drill bit is disassembled into the first pressure plate and the second pressure plate in the thickness direction. The height of the first pressure plate is the total height of the roof-type diamond drill bit including the roof part, and the height of the second pressure plate is the height of the drilling and cutting body. The thickness direction is the direction perpendicular to the extension direction of the longitudinal section of the cutting teeth.

[0068] S2. Cold pressing step: Using a cold pressing mold of appropriate size, the first and second pressing sheets are flattened and formed in the following manner:

[0069] The first pressing plate is formed to include a roof-type drill head 100 and a portion of the drilling body 200 connected to a portion of the bottom of the roof-type drill head 100;

[0070] The second tablet is formed to include the remaining drilled main body portion 200;

[0071] S3. Sintering step: Select a suitable sintering mold, stack the first and second pressed sheets along the thickness direction and sinter them. The roof-type drill head 100 and the drilling and cutting body 200 are formed into a whole through the sintering process. During sintering, a sintered connection part 300 will be formed between the roof-type drill head 100 and the drilling and cutting body 200.

[0072] S4. Demolding and Inspection Steps: Demolding yields the roof-shaped diamond drill bit, and its quality is inspected according to the quality inspection procedures.

[0073] To improve the strength and reliability of the connection, in the sintering step,

[0074] Before sintering, the first pressing sheet is integrally formed with the roof-shaped drill head 100 and the first main body 210 of the drill-cutting main body 200; the second pressing sheet is formed with the second main body 220 of the drill-cutting main body 200.

[0075] After sintering, the first main body 210 and the second main body 220 are connected by a sintered connection 300.

[0076] To ensure the formation of the cold-pressed sheet, the sintering mold includes a concave pressure head and a convex pressure head arranged opposite each other in the sintering step. The concave pressure head and the convex pressure head are used to apply pressure to the cold-pressed sheet so that the cold-pressed sheet is formed during the sintering process. There is a height difference of 0.2 mm between one end of the concave pressure head and its center position, which is used to accurately position the second pressing sheet during mold assembly and avoid its slight displacement.

[0077] To ensure the size and quality of the product, in the sintering step, the first and second pressing sheets are stacked along the thickness direction and then flat-pressed for sintering. The selected sintering mold is used to assist in the product forming to obtain the required size and specifications.

[0078] To ensure uniform heating during sintering, the mold loading sequence is adjusted according to the size of the sintering mold and the product specifications in the sintering step, so as to ensure that the cold-pressed sheet is uniformly pressed and successfully formed during the sintering process.

[0079] To prevent cracking or deformation due to excessive temperature difference, a temperature gradient control is also provided in the sintering process to ensure that the mold and cold-pressed sheet are uniformly heated from room temperature to the sintering temperature, thus avoiding product defects caused by excessive temperature gradient.

[0080] To ensure that the product quality meets the standards, the demolded roof-type diamond drill bit must undergo a quality inspection process, including visual inspection, dimensional measurement, hardness testing, and cutting performance testing, in the demolding inspection step to ensure that the product quality meets the standard requirements.

[0081] To ensure the surface quality of the drill bit and the tightness of its components, the visual inspection involves visually inspecting the drill bit surface for defects such as cracks, pores, and inclusions using a low-magnification magnifying glass. It also checks whether the joint between the roof section and the cutting body is tight and whether there is any delamination or loosening. The dimensional measurement involves using high-precision measuring tools to measure the length, height, and thickness of the drill bit to ensure that it meets the requirements of the design drawings. The accuracy requirements vary for different parts.

[0082] To ensure the cutting performance and service life of the drill bit, the hardness test is conducted by using a hardness tester to test the hardness of the cutting part and the base part of the drill bit separately. This ensures that the cutting part has good wear resistance and cutting performance, while the hardness of the base part should be moderate. The cutting performance test is conducted by mounting the drill bit on a dedicated cutting test equipment and performing a cutting test according to the specified cutting parameters. The stability, cutting force, cutting temperature and other performance indicators of the drill bit during the cutting process are observed.

[0083] In this application, the first pressing tablet can also be referred to as a large cold pressing tablet, and the second pressing tablet can also be referred to as a small cold pressing tablet. The first pressing tablet has a size of 24 mm * 12 mm, and the second pressing tablet has a size of 24 mm * 10 mm. Figure 2 As shown in the cross-sectional view, part of the first pressing plate is a roof-type drill head 100, and the other part is a first main body 210, while the second pressing plate is a second main body 220.

[0084] This application provides a 0.2 mm platform 221 on the side where the second main body 220 connects to the second cutting contact surface 120. The purpose of the platform 221 is to facilitate the positioning of the small cold-pressed sheet during the mold assembly process, and to prevent it from making small displacements that could affect the flatness of the bottom plane of the drill bit or create gaps.

[0085] This application simplifies the production process by merging the two main cold-pressed sheets and one roof cold-pressed sheet in the conventional process into two cold-pressed sheets of different sizes. These sheets are then directly hot-pressed using a sintering mold, reducing the number of cold-pressed sheets from three to two. The simplified process reduces the number of operation steps and the difficulty of mold assembly, making the production process more efficient and enabling the entire production process from cold pressing to sintering to be completed quickly, thereby improving the production efficiency of the product.

[0086] This application reduces the number of cold-pressed sheets and simplifies the molding process, thereby lowering the labor, material, and time costs in the production process. At the same time, it improves the bonding strength between the roof section and the cutting main body, reduces the product scrap rate, and further reduces production costs.

[0087] The method provided in this application eliminates the need to produce small and fragile cold-pressed roof sections, reducing production difficulty and avoiding production problems caused by the fragility of the cold-pressed roof sections. Furthermore, during the sintering process, there is no need to consider the bonding strength of the roof section, and the sintering process can be set according to the requirements of optimal product performance, thereby further improving the quality and performance of the product.

[0088] In this application, the sintered connection 300 refers to the process where, when the temperature reaches the sintering temperature (usually between 800-1000°C), and this temperature is maintained for a period of time (usually between 1 minute and 10 minutes), the contact surface between the plates is formed by grain boundary diffusion migration to form the sintered connection 300. This diffusion process enables the first and second plates to form a strong bond at the contact surface. After sintering is completed, the temperature is gradually reduced so that the sintered connection 300 gradually stabilizes during the cooling process. After cooling to room temperature, it is demolded from the sintering mold to obtain a complete roof-shaped diamond drill bit. At this point, the first and second plates have been firmly bonded together through the sintered connection 300 to form a whole.

[0089] The target roof-type drill bit in this application has dimensions of length * thickness * height, and the drill bit is disassembled into a first pressure plate and a second pressure plate in the thickness direction.

[0090] In the production process of the roof-type diamond drill bit of this application, the size design of the cold-pressed sheet is based on theoretical calculations combined with actual process adjustments. The theoretical size calculation mainly considers a cold-pressing coefficient of about 1.5, which is determined comprehensively based on factors such as material properties, equipment pressure, and final product size requirements. In actual operation, due to the influence of various practical factors such as material plasticity, mold precision, and pressure distribution uniformity, the actual size of the cold-pressed sheet may deviate. After actual measurement and process adjustment, the actual size of the cold-pressed sheet can be 24*3.8*12. In the sintering process, due to the diffusion and flow characteristics of the material at high temperature, the thickness of the cold-pressed sheet will further change. By precisely controlling parameters such as sintering temperature, time, and pressure, it is ensured that the material fully diffuses and fills the mold cavity during sintering, thereby enabling the thickness of the roof-type diamond drill bit to reach the theoretical requirement of 2.5mm. This process not only ensures the dimensional accuracy of the product, but also effectively improves production efficiency and product quality stability by optimizing process parameters and quality control measures.

[0091] Example 1:

[0092] The roof-type drill bit produced in this embodiment has the specifications φ200-24*5.0*(10+2), that is, the drill bit diameter is 200 mm, the drill bit length is 24 mm, and the drill bit thickness is 5.0 mm. The height of the cutting body is 10 mm, and the height of the roof part is 2 mm. It is produced according to the following method:

[0093] S1. Based on the product specifications of the target production object, the drill bit is disassembled into a first pressing plate with theoretical dimensions of 24*2.5*12 and a second pressing plate with a thickness of 24*2.5*10 in the thickness direction;

[0094] S2. After calculating the material weight based on the theoretical dimensions, use cold pressing equipment to produce the two types of cold-pressed sheets mentioned in S1 above.

[0095] S3. Using a φ200 drill bit sintering mold, stack the two cold-pressed sheets produced in S2 along the thickness direction and press them flat for sintering. The order of stacking the sheets from bottom to top is: concave pressing head - second pressing sheet - first pressing sheet - convex pressing head.

[0096] S4. After sintering, demold to obtain a φ200-24*5.0*(10+2) roof-type drill bit.

[0097] The mold assembly sequence in this embodiment 1 is designed to ensure that the first pressing sheet can be bent and broken smoothly during the sintering process to fill the mold cavity of the roof part, while the second pressing sheet provides support in the middle to ensure the bonding strength.

[0098] Example 2:

[0099] The roof-type drill bit produced in this embodiment has the specifications φ50-24*3.5*(10+2), that is, the drill bit diameter is 50 mm, the drill bit length is 24 mm, and the drill bit thickness is 3.5 mm. The height of the cutting body is 10 mm, and the height of the roof part is 2 mm. It is produced according to the following method:

[0100] S1. Based on the product specifications of the target production object, the drill bit is disassembled into a first pressing plate with theoretical dimensions of 24*2.0*12 and a second pressing plate with dimensions of 24*1.5*10 in the thickness direction;

[0101] S2. After calculating the material weight based on the theoretical dimensions, use cold pressing equipment to produce the two types of cold-pressed sheets mentioned in S1 above.

[0102] S3. Using a φ50 drill bit sintering mold, stack the two cold-pressed sheets produced in S2 along the thickness direction and press them flat for sintering. The order of stacking the sheets from bottom to top is: convex pressing head - second pressing sheet - first pressing sheet - concave pressing head.

[0103] S4. After sintering, demold to obtain a φ50-24*3.5*(10+2) roof-type drill bit.

[0104] The mold assembly sequence in this embodiment 2 is designed to ensure that the cold-pressed sheet is uniformly pressed during the sintering process in a mold with a smaller diameter, thereby avoiding deformation or poor bonding caused by uneven pressure.

[0105] Example 3:

[0106] The roof-type drill bit produced in this embodiment has the specifications φ150-24*4.0*(10+1), that is, the drill bit diameter is 150 mm, the drill bit length is 24 mm, and the drill bit thickness is 4.0 mm. The height of the cutting body is 10 mm, and the height of the roof part is 1 mm. It is manufactured according to the following method:

[0107] S1. Based on the product specifications of the target production object, the drill bit is disassembled into a first pressing plate with a theoretical size of 24*2.0*11 and a second pressing plate with a thickness of 24*2.0*10 in the thickness direction;

[0108] S2. After calculating the material weight based on the theoretical dimensions, use cold pressing equipment to produce the two types of cold-pressed sheets mentioned in S1 above.

[0109] S3. Using a φ150 drill bit sintering mold, stack the two cold-pressed sheets produced in S2 along the thickness direction and press them flat for sintering. The order of stacking the sheets from bottom to top is: concave pressing head - first pressing sheet - second pressing sheet - convex pressing head.

[0110] S4. After sintering, demold to obtain a φ150-24*4.0*(10+1) roof-type drill bit.

[0111] The mold assembly sequence in this embodiment 3 is designed to ensure that the first pressing sheet can be bent and broken smoothly during the sintering process with a small roof height, while the second pressing sheet provides support at the top to ensure the stability of the overall structure.

[0112] Temperature gradient control in this application refers to the precise management of the heating rate during the sintering process, so that the mold and cold-pressed sheet are heated uniformly and gradually from room temperature to the sintering temperature. Specifically, the temperature is gradually increased at a low heating rate (e.g., 5 to 10 degrees Celsius per minute) to avoid excessively rapid temperature changes. This can prevent the cold-pressed sheet from cracking or deforming due to thermal stress concentration, ensure uniform heating, maintain structural and performance stability, thereby improving sintering quality and reducing product defects.

[0113] In this application, the design of the first cutting contact surface 110 and the second cutting contact surface 120 of the roof-type diamond drill bit has a variety of variations to adapt to different cutting requirements and workpiece materials.

[0114] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the second cutting contact surface 120 in this application can be any combination of two or more of the following: a straight inclined surface, a concave arc surface, and a convex arc surface. A straight inclined surface can provide a uniform cutting depth and a stable cutting force, which is suitable for machining general materials. A concave arc surface helps to reduce the contact area between the cutting edge and the workpiece and lower the cutting temperature, which is suitable for high-speed cutting. A convex arc surface can increase the strength of the cutting edge, which is suitable for heavy-duty cutting and machining of hard materials.

[0115] Furthermore, the first cutting contact surface 110 in this application can be either a plane or a sharp angle. A plane design helps to provide stable cutting contact and a larger contact area, which is suitable for machining soft materials; while a sharp angle design can concentrate cutting force and increase local pressure, which is suitable for cutting hard materials.

[0116] like Figure 7 , Figure 8 and Figure 9 As shown, as an extension of this application, a roof-type diamond drill bit with corrugated grooves can also be manufactured by the production method of this utility model. The design of the corrugated grooves can further optimize the heat dissipation performance and chip removal during the cutting process, reduce heat accumulation and chip buildup during the cutting process, and improve cutting efficiency and processing quality.

[0117] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0118] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A roof-type diamond drill bit, characterized in that: It includes: A roof-type drill head (100) has a roof-shaped structure in which the longitudinal section of the cutting teeth gradually decreases from the bottom to the head, so as to make the contact area of ​​the roof-type drill head (100) smaller, thus making it less prone to slippage and providing a stable cutting contact surface. The main body of the drilling and cutting part (200) is connected to the bottom of the roof-type drill head (100) and the other part is not connected to the roof-type drill head (100) and a platform (221) is reserved at the edge of the unconnected part for precise positioning during the mold assembly process. Among them, the roof-type drill bit (100) and the drilling and cutting body (200) are formed into a whole through a sintering process. During sintering, a sintered connection part (300) is formed between the roof-type drill bit (100) and the drilling and cutting body (200). The sintered connection part (300) has good diffusion bonding characteristics, which further enhances the bonding strength between the two and extends the service life of the roof-type diamond drill bit.

2. The roof-type diamond drill bit according to claim 1, characterized in that: The drilling body (200) includes a first body (210) and a second body (220), which are connected by a sintered connection (300).

3. The roof-type diamond drill bit according to claim 2, characterized in that: The chip contact surface provided by the roof-type drill bit (100) includes: The first cutting contact surface (110) is parallel to the bottom surface of the roof-type drill head (100). The width of the first cutting contact surface (110) in the horizontal direction is smaller than the width of the bottom surface of the roof-type drill head (100) to provide stable cutting contact. The second cutting contact surface (120) is connected on one side to the side of the first main body (210) away from the sintered connection part (300), and the other side of the second cutting contact surface (120) is connected to the side of the second main body away from the sintered connection part (300). A platform (221) is reserved at the connection between the second main body (220) and the second cutting contact surface (120). The platform (221) is used to achieve precise positioning during the molding process, thereby ensuring the flatness and bonding strength of the bottom of the roof-type drill head (100).

4. The roof-type diamond drill bit according to claim 3, characterized in that: The second cutting contact surface (120) is at least one of a straight surface or an arc surface, and the first cutting contact surface (110) is at least one of a plane or a sharp corner.

5. The roof-type diamond drill bit according to claim 3, characterized in that: The second cutting contact surface (120) is wavy and grooved when viewed from above. The drilling body (200) that is connected to the groove of the second cutting contact surface (120) is also formed in a corresponding semi-cylindrical shape with grooves in the vertical direction.

6. The roof-type diamond drill bit according to claim 4, characterized in that: When the second cutting contact surface (120) is an arc surface, the arc surface is an outwardly protruding arc surface, which makes the roof-type drill head (100) have better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

7. The roof-type diamond drill bit according to claim 4, characterized in that: When the second cutting contact surface (120) is an arc surface, the arc surface is an inwardly concave arc surface, which makes the cutting edge strength of the roof-type drill head (100) stronger during the cutting process, and at the same time improves chip control, reducing the friction and heat accumulation between the chips and the first cutting contact surface (110).

8. The roof-type diamond drill bit according to claim 5, characterized in that: The semi-cylindrical grooves on both sides of the drilling and cutting main body (200) can be arranged either oppositely or at intervals to adapt to different cutting requirements and material properties, thereby optimizing heat dissipation performance, chip control and cutting stability during the cutting process.

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