A roof-type diamond bit and its production method

Abstract

A roof-type diamond drill bit, which comprises: a roof-type drill head and a drilling and cutting main body. The longitudinal section of the cutting teeth of the roof-type drill head has a roof-shaped structure that gradually decreases in the direction from the bottom to the head, so as to make the contact area of the roof-type drill head smaller, thus making it not easy to slip and shift, and providing a stable cutting contact surface; the drilling and cutting main body is connected to the bottom of the roof-type drill head, and is used to support the roof-type drill head and bear the pressure and friction generated during high-speed rotation and cutting. A sintered connection part will be formed between the roof-type drill head and the drilling and cutting main body during sintering. The process flow of this application reduces the operation steps and the difficulty of mold loading, makes the production process more efficient, can quickly complete the entire production process from cold pressing to sintering, and improves the production efficiency of the product.

Description

Technical Field

[0001] The present invention relates to a roof-shaped diamond bit and a production method thereof, belonging to the technical field of diamond tool preparation. Background Art

[0002] When a diamond bit, as a drilling and cutting tool, is in use, the bit teeth need to be welded to the bit matrix. Drilling and cutting are achieved by relying on high-speed rotation while continuously applying a downward pressure. The longitudinal section of the bit teeth of a conventional diamond bit is rectangular, and situations such as slipping and deviation are likely to occur in the initial stage of use. The roof-shaped bit has a roof structure added on the basis of the conventional bit, and has a smaller contact area with the drilling and cutting object. The currently commonly used production process for roof bits in the industry is to separately cold-press the drilling main body and the roof part, and then sinter and form through die assembly.

[0003] The drawback of this method is that the cold-pressing process is cumbersome and the die assembly process for sintering is relatively difficult. Taking the common 24*4.0*12 roof-shaped ordered bit as an example, when producing, it is necessary to press two 24*10 ordered cold-pressed sheets as the drilling main body, and then separately cold-press the thinner roof part for die assembly and sintering. Since the cold-pressed sheet of the roof part is small and fragile, it brings many inconveniences to the die assembly process; in order to ensure the bonding strength between the roof part and the drilling main body, some enterprises often additionally add a combined die cold-pressing process to press the roof and the drilling main body into one body and then carry out die assembly and sintering. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a roof-shaped diamond bit and a production method thereof, so as to solve the problems that the manufacturing process of the existing roof bit is cumbersome and the die assembly process for sintering is relatively difficult.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A roof-shaped diamond bit, which includes:

[0006] A roof-shaped drill head, the longitudinal section of the bit teeth of the roof-shaped drill head is in a roof-shaped structure that gradually decreases in the direction from the bottom to the head, so as to make the contact area of the roof-shaped drill head smaller, thus making it not easy to slip and deviate, and providing a stable cutting contact surface;

[0007] A drilling main body part, at least a part of the drilling main body part is connected to the bottom of the roof-shaped drill head, used to provide support for the roof-shaped drill head, and used to bear the pressure and friction generated during high-speed rotation and cutting;

[0008] Among them, the roof-shaped drill head and the drill cutting main body are formed into an integral body through a sintering process. During sintering, a sintered connection part will be formed between the roof-shaped drill head and the drill cutting main body. The sintered connection part includes two parts: one part is horizontally arranged between the bottom surface of the roof-shaped drill head and the drill cutting main body, and the other part is vertically arranged in the central area of the drill cutting main body.

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

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

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

[0012] The second cutting contact surface, one side of the second cutting contact surface is connected to the side of the first main body away from the sintered connection part, the other side of the second cutting contact surface is connected to the side of the second main body away from the sintered connection part, and a platform is reserved at the connection between the second main body and the second cutting contact surface. This platform is used for precise positioning during the mold loading process, so as to ensure the flatness and bonding strength of the bottom of the roof-shaped drill head.

[0013] Furthermore, the second cutting contact surface is at least one of a straight surface or a curved surface, and the first cutting contact surface is one of a flat surface or a sharp angle.

[0014] Furthermore, when viewed from the top, the second cutting contact surface is in the shape of a wavy groove. Among them, the drill cutting main body in contact with the groove of the second cutting contact surface also correspondingly forms a semi-cylindrical shape with a groove in the vertical direction.

[0015] Furthermore, when the second cutting contact surface is a curved surface, the curved surface is a convex curved surface, so that the roof-shaped drill head has better guiding performance during the cutting process, reduces vibration and offset, and improves cutting accuracy and stability.

[0016] Furthermore, when the second cutting contact surface is a curved surface, the curved surface is a concave curved surface, so that the cutting edge strength of the roof-shaped drill head is enhanced during the cutting process, and at the same time, chip control is improved, and the friction and heat accumulation between the chip and the first cutting contact surface are reduced.

[0017] A production method of a roof-shaped diamond drill bit includes the following steps:

[0018] S1. Preparation step: According to the size specifications of the roof-shaped diamond bit to be produced, disassemble the roof-shaped diamond bit in the thickness direction into a first pressing piece and a second pressing piece. The height of the first pressing piece is the total height of the roof-shaped diamond bit including the roof part, and the height of the second pressing piece is the height of the cutting body. The thickness direction is the vertical direction of the extension direction of the cutting tooth longitudinal section.

[0019] S2. Cold pressing step: Use a cold pressing die of corresponding size to flatly press and form the first pressing piece and the second pressing piece respectively in the following manner:

[0020] Make the first pressing piece form into a shape including a roof-shaped drill head part and a part of the cutting body part connected to a part of the bottom of the roof-shaped drill head part;

[0021] Make the second pressing piece form into a shape including the remaining cutting body part;

[0022] S3. Sintering step: Select a suitable sintering die, stack and install the flatly pressed and formed first pressing piece and second pressing piece in the thickness direction and flatly press and sinter them into shape. Among them, the roof-shaped drill head part and the cutting body part form an integral whole through the sintering process. During sintering, a sintering connection part will be formed between the roof-shaped drill head part and the cutting body part;

[0023] S4. Demolding and inspection step: Demold to obtain the roof-shaped diamond bit and inspect its quality according to the quality inspection process.

[0024] Further, in the sintering step,

[0025] Before sintering, the first pressing piece integrally forms a roof-shaped drill head part and a first main body part of the cutting body part; the second pressing piece forms a second main body part of the cutting body part;

[0026] After sintering, the first main body part and the second main body part are connected through the sintering connection part.

[0027] Further, in the preparation step, the first pressing piece and the second pressing piece have the same length, and the first pressing piece and the second pressing piece have the same or different thicknesses.

[0028] Further, in the sintering step, the sintering die includes a concave pressing head and a convex pressing head arranged oppositely. The concave pressing head and the convex pressing head are used to apply pressure to the cold pressing piece to make the cold pressing piece form during the sintering process. Among them, there is a 0.2 mm height difference between one end of the concave pressing head and its central position, which is used to accurately position the second pressing piece during mold installation to avoid its small displacement.

[0029] Further, in the sintering step, after the first pressing piece and the second pressing piece are stacked and installed in the thickness direction, they are flatly pressed and sintered, and rely on the selected sintering die to assist the product to form into the required size specifications.

[0030] Further, 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 tablets are evenly pressed and smoothly formed during the sintering process.

[0031] Further, in the sintering step, temperature gradient control is also provided during the sintering process to uniformly heat the mold and the cold-pressed tablets from room temperature to the sintering temperature, avoiding product defects caused by excessive temperature gradients.

[0032] Further, in the demolding and inspection step, the roof-shaped diamond drill bit after demolding also needs to go through 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.

[0033] Further, for the appearance inspection, visually or using a low-power magnifying glass to check whether there are defects such as cracks, pores, and inclusions on the surface of the drill bit, and check whether the joint between the roof part and the cutting body part is tight, without delamination or loosening. For the dimensional measurement, use high-precision measuring tools to measure the length, height, and thickness dimensions of the drill bit to ensure that they meet the requirements of the design drawings, and the precision requirements for different parts are different.

[0034] Further, for the hardness testing, use a hardness tester to separately test the hardness of the cutting part and the matrix part of the drill bit to ensure that the cutting part has good wear resistance and cutting performance, and the hardness of the matrix part should be moderate. For the cutting performance testing, install the drill bit on a special cutting test equipment and conduct cutting tests according to the specified cutting parameters, and observe performance indicators such as the stability, cutting force, and cutting temperature of the drill bit during the cutting process.

[0035] The beneficial effects of the present invention are as follows:

[0036] 1. This application simplifies the production process. By combining two cold-pressed tablets for the drill cutting body and one cold-pressed tablet for the roof part in the conventional process into two cold-pressed tablets of different sizes and directly using the sintering mold for hot pressing forming, the number of cold-pressed tablets is reduced from three to two. The simplified process flow reduces the operation steps and the difficulty of mold loading, making the production process more efficient, capable of quickly completing the entire production process from cold pressing to sintering, and improving the production efficiency of the product.

[0037] 2. This application reduces the labor, material, and time costs during the production process by reducing the number of cold-pressed tablets and simplifying the mold loading process. At the same time, it improves the bonding strength between the roof part and the cutting body part, reduces the product rejection rate, and further reduces the production cost.

[0038] 3. The method provided by the present application does not require the production of small and fragile cold-pressed sheets for the roof part, reducing the production difficulty and avoiding production problems caused by the fragility of the cold-pressed sheets for the roof part. Moreover, during the sintering process, there is no need to additionally consider the bonding strength problem of the roof part, and the sintering process can be set according to the requirements of the optimal performance of the product, thereby further improving the quality and performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features, objects, and advantages of the present invention will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0040] Figure 1 is a roof-type diamond drill bit produced by using the production method of a roof-type diamond drill bit provided by the present invention;

[0041] Figure 2 is a schematic structural diagram of the roof-type diamond drill bit of the present invention along the A-A' section (this A-A' section is also called the longitudinal section of the cutter tooth);

[0042] Figure 3 is a schematic flow chart of the production method of a roof-type diamond drill bit of the present invention;

[0043] Figure 4 is a schematic flow chart of the quality inspection process in the present invention;

[0044] Figure 5 is a schematic structural diagram of the first pressing sheet and the second pressing sheet of the present invention

[0045] Figure 6 is a schematic structural diagram of the production method of a roof-type diamond drill bit of the present invention;

[0046] Figure 7 is a schematic sectional structure diagram of the roof-type diamond drill bit A in the present invention;

[0047] Figure 8 is a schematic sectional structure diagram of the roof-type diamond drill bit B in the present invention;

[0048] Figure 9 is a schematic sectional structure diagram of the roof-type diamond drill bit C in the present invention;

[0049] Figure 10 is a schematic sectional structure diagram of the roof-type diamond drill bit D in the present invention;

[0050] Figure 11 is a schematic physical diagram of the roof-type diamond drill bit E in the present invention;

[0051] Figure 12 is a schematic top view structural diagram of the diamond drill bit E;

[0052] Figure 13 It is a schematic cross-sectional structure diagram of the diamond drill bit E.

[0053] The reference numerals are respectively: 1, the first pressing piece; 2, the second pressing piece; 3, the convex pressing head; 4, the concave pressing head; 100, the roof-shaped drill head part; 110, the first cutting contact surface; 120, the second cutting contact surface; 200, the drill cutting main body part; 210, the first main body part; 220, the second main body part; 221, the platform; 300, the sintered connection part. Specific embodiments

[0054] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0055] As Figure 1 and Figure 2 shown, the present application provides a roof-shaped diamond drill bit, which includes:

[0056] A roof-shaped drill head part 100, the longitudinal section of the cutting teeth of the roof-shaped drill head part 100 is in a roof-shaped structure that gradually decreases in the direction extending from the bottom to the head, so as to make the contact area of the roof-shaped drill head part 100 smaller, thus not easily slipping and shifting, and providing a stable cutting contact surface;

[0057] A drill cutting main body part 200, at least a part of the drill cutting main body part 200 is connected to the bottom of the roof-shaped drill head part 100, for providing support to the roof-shaped drill head part 100 and for bearing the pressure and friction generated during high-speed rotation and cutting;

[0058] Among them, the roof-shaped drill head part 100 and the drill cutting main body part 200 are formed into an integral body through a sintering process. During sintering, a sintered connection part 300 will be formed between the roof-shaped drill head part 100 and the drill cutting main body part 200. The sintered connection part 300 includes two parts: one part is horizontally arranged between the bottom surface of the roof-shaped drill head part 100 and the drill cutting main body part 200, and the other part is vertically arranged in the central area of the drill cutting main body part 200.

[0059] In order to improve the structural stability and service life of the drill bit, the drill cutting main body part 200 includes a first main body part 210 and a second main body part 220, and the first main body part 210 and the second main body part 220 are connected by a sintered connection part 300.

[0060] In order to optimize the cutting performance and reduce stress concentration, the chip contact surface provided by the roof-shaped drill head part 100 includes:

[0061] The first cutting contact surface 110, the first cutting contact surface 110 is parallel to the bottom surface of the roof-shaped drill head 100, and the width of the first cutting contact surface in the horizontal direction is smaller than the width of the bottom surface of the roof-shaped drill head 100, which is used to provide stable cutting contact;

[0062] The second cutting contact surface 120, one side of the second cutting contact surface 120 is connected to the side of the first main body portion 210 away from the sintering connection portion 300, the other side of the second cutting contact surface 120 is connected to the side of the second main body portion away from the sintering connection portion 300, and a platform 221 is reserved at the connection between the second main body portion 220 and the second cutting contact surface 120. The platform 221 is used for precise positioning during the mold loading process, so as to ensure the flatness and bonding strength of the bottom of the roof-shaped drill head 100.

[0063] In order to adapt to different cutting requirements and material characteristics, the second cutting contact surface 120 is at least one of a straight surface or a curved surface, and the first cutting contact surface 110 is one of a flat surface or a sharp angle.

[0064] In order to optimize the cutting performance and adapt to different cutting scenarios, when viewed from the top, the second cutting contact surface 120 is in the shape of a wavy groove. Among them, the drill cutting main body portion 200 connected to the groove of the second cutting contact surface 120 also correspondingly forms a semi-cylindrical shape with a groove in the vertical direction.

[0065] In order to improve the guiding performance and cutting accuracy of the drill bit, when the second cutting contact surface 120 is a curved surface, the curved surface is a curved surface protruding outward, so that the roof-shaped drill head 100 has better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

[0066] In order to enhance the strength of the cutting edge, when the second cutting contact surface 120 is a curved surface, the curved surface is a concave curved surface, so that the strength of the cutting edge of the roof-shaped drill head 100 is enhanced during the cutting process, and at the same time, chip control is improved, and the friction and heat accumulation between the chip and the first cutting contact surface 110 are reduced.

[0067] The contact area between the roof part of the roof-shaped diamond drill bit provided by this application and the drilling object is smaller. The roof-shaped diamond drill bit is not prone to slipping and deviation during use, and can improve the accuracy and stability of drilling; the optimized roof structure design makes the roof-shaped diamond drill bit more efficient during the cutting process, reduces the cutting force and cutting temperature, and prolongs the service life of the drill bit; the use of high-quality diamond composite materials ensures the wear resistance and durability of the drill bit in high-intensity cutting operations.

[0068] Such as Figure 3 、 Figure 4 、 Figure 5 andFigure 6 As shown, in order to improve production efficiency, the present invention provides a technical solution for a production method of a roof-shaped diamond drill bit, which includes the following steps:

[0069] S1. Preparation step: According to the size specifications of the roof-shaped diamond drill bit to be produced, the roof-shaped diamond drill bit is disassembled into a first pressing piece 1 and a second pressing piece 2 in the thickness direction. The height of the first pressing piece 1 is the total height of the roof-shaped diamond drill bit including the roof part, and the height of the second pressing piece 2 is the height of the drill cutting body, where the thickness direction is the vertical direction of the extension direction of the cutter tooth longitudinal section;

[0070] S2. Cold pressing step: Using a cold pressing die of corresponding size, the first pressing piece 1 and the second pressing piece 2 are respectively flat-pressed and formed in the following manner:

[0071] The first pressing piece 1 is formed into a roof-shaped drill head part 100 and a part of the drill cutting body part 200 connected to a part of the bottom of the roof-shaped drill head part 100;

[0072] The second pressing piece 2 is formed into the remaining drill cutting body part 200;

[0073] S3. Sintering step: Select a suitable sintering die, stack and load the flat-pressed first pressing piece 1 and second pressing piece 2 in the thickness direction and sinter them flat. Among them, the roof-shaped drill head part 100 and the drill cutting body part 200 form an integral body through the sintering process. During sintering, a sintering connection part 300 will be formed between the roof-shaped drill head part 100 and the drill cutting body part 200;

[0074] S4. Demolding and inspection step: Demold to obtain the roof-shaped diamond drill bit, and detect its quality according to the quality inspection process.

[0075] In order to improve the strength and reliability of the connection, in the said sintering step,

[0076] Before sintering, the first pressing piece 1 integrally forms the roof-shaped drill head part 100 and the first main body part 210 of the drill cutting body part 200; the second pressing piece 2 forms the second main body part 220 of the drill cutting body part 200;

[0077] After sintering, the first main body part 210 and the second main body part 220 are connected through the sintering connection part 300.

[0078] In order to ensure the cold pressing sheet forming, in the said sintering step, the sintering die includes a concave pressing head 4 and a convex pressing head 3 arranged oppositely. The concave pressing head 4 and the convex pressing head 3 are used to apply pressure to the cold pressing sheet to make the cold pressing sheet form during the sintering process. Among them, there is a 0.2 mm height difference between one end of the concave pressing head 4 and its central position, which is used to accurately position the second pressing piece 2 during mold loading to avoid its small displacement.

[0079] To ensure the dimensional specifications and quality of the product, in the sintering step, the first tablet 1 and the second tablet 2 are stacked along the thickness direction, loaded into the mold, and then flat-pressed and sintered. By relying on the selected sintering mold, the product is assisted to form into the required dimensional specifications.

[0080] To ensure uniform heating during the sintering process, in the sintering step, the loading sequence of the mold is adjusted according to the size of the sintering mold and the product specifications, so as to ensure that the cold-pressed tablets are evenly pressed and successfully formed during the sintering process.

[0081] To avoid cracking or deformation caused by excessive temperature difference, in the sintering step, temperature gradient control is also provided during the sintering process, so that the mold and the cold-pressed tablets are uniformly heated from room temperature to the sintering temperature, avoiding product defects caused by excessive temperature gradient.

[0082] To ensure that the product quality meets the standards, in the demolding and inspection step, the roof-shaped diamond drill bit after demolding also needs to go through quality inspection procedures such as appearance inspection, dimensional measurement, hardness test, and cutting performance test, so as to ensure that the product quality meets the standard requirements.

[0083] To ensure the surface quality of the drill bit and the tight combination of each part, in the appearance inspection, visually or with a low-power magnifying glass, check whether there are defects such as cracks, pores, and inclusions on the surface of the drill bit, and check whether the joint between the roof part and the cutting main body part is tight, without delamination or loosening. In the dimensional measurement, use high-precision measuring tools to measure the length, height, and thickness dimensions of the drill bit to ensure that they meet the requirements of the design drawings, and the precision requirements for different parts are different.

[0084] To ensure the cutting performance and service life of the drill bit, in the hardness test, use a hardness tester to perform hardness tests on the cutting part and the matrix part of the drill bit respectively, to ensure that the cutting part has good wear resistance and cutting performance, and the hardness of the matrix part should be moderate. In the cutting performance test, install the drill bit on a special cutting test equipment and perform cutting tests according to the specified cutting parameters, and observe performance indicators such as the stability, cutting force, and cutting temperature of the drill bit during the cutting process.

[0085] In this application, the first tablet 1 can also be called the large cold-pressed tablet, and the second tablet 2 can also be called the small cold-pressed tablet. The first tablet 1 has a specification of 24 mm * 12 mm, and the second tablet 2 has a specification of 24 mm * 10 mm. As Figure 2 shown in the sectional view, a part of the first tablet 1 is the roof-shaped drill head part 100, and the other part is the first main body part 210, while the second tablet 2 is the second main body part 220.

[0086] On one side where the second main body part 220 is connected to the second cutting contact surface 120 of this application, a platform 221 with a thickness of 0.2 mm is reserved. The function of the platform 221 is to facilitate the positioning of the small cold pressing sheet during the mold loading process, preventing it from generating tiny displacements that may affect the flatness of the bottom plane of the drill bit or create gaps.

[0087] This application simplifies the production process. By combining two cold pressing sheets for the drill cutting main body and one cold pressing sheet for the roof part in the conventional process into two cold pressing sheets of different sizes, directly using the sintering mold for hot pressing forming, the number of cold pressing sheets is reduced from three to two. The simplified process flow reduces the operation steps and the difficulty of mold loading, making the production process more efficient, enabling the rapid completion of the entire production process from cold pressing to sintering, and improving the production efficiency of the product.

[0088] This application reduces the labor, material, and time costs during the production process by reducing the number of cold pressing sheets and simplifying the mold loading process. At the same time, it improves the bonding strength between the roof part and the cutting main body part, reduces the scrap rate of the product, and further reduces the production cost.

[0089] The method provided by this application does not require the production of small and fragile cold pressing sheets for the roof part, reducing the production difficulty and avoiding production problems caused by the fragility of the cold pressing sheets for the roof part. Moreover, during the sintering process, there is no need to additionally consider the bonding strength problem of the roof part, and the sintering process can be set according to the requirements of the optimal performance of the product, thereby further improving the quality and performance of the product.

[0090] The sintering connection part 300 in this application refers to the process in which when the temperature reaches the sintering temperature (usually between 800 - 1000 °C) and is maintained for a certain period of time (usually between 1 minute and 10 minutes), during this process, the contact surface between the pressing sheets forms the sintering connection part 300 through grain boundary diffusion migration. This diffusion process enables the first pressing sheet 1 and the second pressing sheet 2 to form a firm bond at the contact surface. After sintering is completed, the temperature is gradually reduced, so that the sintering connection part 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 time, the first pressing sheet 1 and the second pressing sheet 2 have been firmly bonded together through the sintering connection part 300 to form a whole.

[0091] The target size specification of the roof-shaped drill bit in this application is length * thickness * height. The drill bit is disassembled into the first pressing sheet 1 and the second pressing sheet 2 from the thickness direction. The sizes of the cold pressing sheets mentioned in the following embodiments are all the theoretical design sizes of the product. During the actual production process, due to the influence of the cold pressing process and equipment, the different green compact densities result in different heights of the cold pressing sheets in the pressure direction. It is necessary to make the product approach full densification through the sintering process to reach the theoretical design size.

[0092] Example 1:

[0093] The product specification of the roof-type drill bit produced in this embodiment is φ200-24*5.0*(10+2), that is, the drill bit diameter is 200 mm, the drill bit length is 24 mm, the drill bit thickness is 5.0 mm, where the height of the cutting main body part is 10 mm, and the height of the roof part is 2 mm. It is produced according to the following method:

[0094] S1. According to the product specification of the target production object, disassemble the drill bit in the thickness direction into a first pressing sheet 1 with a theoretical size of 24*2.5*12 and a second pressing sheet 2 with a theoretical size of 24*2.5*10;

[0095] S2. After calculating the material weight according to the theoretical size, use cold pressing equipment to produce the two cold pressing sheets mentioned in S1 above respectively;

[0096] S3. Use a φ200 drill bit sintering die to stack and load the two cold pressing sheets produced in S2 above in the thickness direction and perform flat pressing sintering. Among them, the loading order from bottom to top is the concave pressing head 4 - the second pressing sheet 2 - the first pressing sheet 1 - the convex pressing head 3;

[0097] S4. After sintering, demold to obtain a φ200-24*5.0*(10+2) roof-type drill bit.

[0098] The design of the loading order in this embodiment 1 is to ensure that the first pressing sheet 1 can be smoothly bent and broken during the sintering process, fill the mold cavity of the roof part, and at the same time, the second pressing sheet 2 provides support in the middle to ensure the bonding strength.

[0099] Embodiment 2:

[0100] The product specification of the roof-type drill bit produced in this embodiment is φ50-24*3.5*(10+2), that is, the drill bit diameter is 50 mm, the drill bit length is 24 mm, the drill bit thickness is 3.5 mm, where the height of the cutting main body part is 10 mm, and the height of the roof part is 2 mm. It is produced according to the following method:

[0101] S1. According to the product specification of the target production object, disassemble the drill bit in the thickness direction into a first pressing sheet 1 with a theoretical size of 24*2.0*12 and a second pressing sheet 2 with a theoretical size of 24*1.5*10;

[0102] S2. After calculating the material weight according to the theoretical size, use cold pressing equipment to produce the two cold pressing sheets mentioned in S1 above respectively;

[0103] S3. Use a φ50 drill bit sintering die to stack and load the two cold pressing sheets produced in S2 above in the thickness direction and perform flat pressing sintering. Among them, the loading order from bottom to top is the convex pressing head 3 - the second pressing sheet 2 - the first pressing sheet 1 - the concave pressing head 4;

[0104] S4. After sintering is completed, demold to obtain a roof-shaped drill bit with a diameter of φ50 - 24 * 3.5 * (10 + 2).

[0105] The design of the mold loading sequence in this Embodiment 2 is to ensure that the cold-pressed sheet is evenly pressed during the sintering process in a mold with a smaller diameter, and to avoid deformation or poor bonding caused by uneven pressure.

[0106] Embodiment 3:

[0107] The product specifications of the roof-shaped drill bit produced in this embodiment are φ150 - 24 * 4.0 * (10 + 1), that is, the drill bit diameter is 150 mm, the drill bit length is 24 mm, the drill bit thickness is 4.0 mm, the height of the cutting main body part is 10 mm, and the height of the roof part is 1 mm. It is produced according to the following method:

[0108] S1. According to the product specifications of the target production object, disassemble the drill bit in the thickness direction into a first pressed sheet 1 with a theoretical size of 24 * 2.0 * 11 and a second pressed sheet 2 with a theoretical size of 24 * 2.0 * 10;

[0109] S2. After calculating the material weight according to the theoretical size, use cold pressing equipment to produce the two cold-pressed sheets mentioned in S1 above;

[0110] S3. Use a drill bit sintering mold with a diameter of φ150 to stack and load the two cold-pressed sheets produced in S2 above in the thickness direction and perform flat pressing sintering. Among them, the mold loading sequence is, from bottom to top, the concave punch 4 - the first pressed sheet 1 - the second pressed sheet 2 - the convex punch 3;

[0111] S4. After sintering is completed, demold to obtain a roof-shaped drill bit with a diameter of φ150 - 24 * 4.0 * (10 + 1).

[0112] The design of the mold loading sequence in this Embodiment 3 is to ensure that the first pressed sheet 1 can be smoothly bent and broken during the sintering process under a smaller roof height, and at the same time, the second pressed sheet 2 provides support on the upper part to ensure the stability of the overall structure.

[0113] The temperature gradient control in this application refers to precisely managing the heating rate during the sintering process, so that the mold and the cold-pressed sheet are uniformly and gradually heated from room temperature to the sintering temperature. Specifically, it is to gradually increase the temperature at a lower heating rate (such as 5 to 10 degrees Celsius per minute) to avoid too rapid temperature changes. This can prevent the cold-pressed sheet from cracking or deforming due to thermal stress concentration, ensure its uniform heating, maintain the stability of the structure and performance, thereby improving the sintering quality and reducing product defects.

[0114] In this application, the designs of the first cutting contact surface 110 and the second cutting contact surface 120 of the roof-shaped diamond drill bit have various variations to adapt to different cutting requirements and workpiece materials.

[0115] As Figure 7 , Figure 8 , Figure 9 and Figure 10 shown, in the present application, the second cutting contact surface 120 can be any combination of any two or one of a flat inclined plane, a concave arc surface, and a convex arc surface. The flat inclined plane can provide a uniform cutting depth and a stable cutting force, and is suitable for the processing of general materials; the concave arc surface helps to reduce the contact area between the cutting edge and the workpiece and lower the cutting temperature, and is suitable for high-speed cutting; the convex arc surface can increase the strength of the cutting edge and is suitable for heavy-duty cutting and the processing of hard materials.

[0116] In addition, in the present application, the first cutting contact surface 110 can be one of a plane or a sharp angle. The design of the plane helps to provide stable cutting contact and a large contact area, and is suitable for the processing of soft materials; while the design of the sharp angle can concentrate the cutting force and increase the local pressure, and is suitable for the cutting of hard materials.

[0117] As Figure 11 , Figure 12 and Figure 13 shown, as an extended example of the present application, a roof-shaped diamond drill bit with corrugated grooves can also be manufactured by the production method of the present invention. The design of the corrugated grooves can further optimize the heat dissipation performance and chip evacuation during cutting, reduce the heat accumulation and chip accumulation during cutting, and improve the cutting efficiency and processing quality.

[0118] The foregoing shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0119] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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-shaped drill head (100), the longitudinal section of the cutting teeth of the roof-shaped drill head (100) is in a roof-shaped structure that gradually decreases in the direction extending from the bottom to the head, which is used to make the contact area of the roof-shaped drill head (100) smaller, so it is not easy to slip and shift, and provides a stable cutting contact surface; A drill cutting main body (200), at least a part of the drill cutting main body (200) is connected to the bottom of the roof-shaped drill head (100), which is used to support the roof-shaped drill head (100) and bear the pressure and friction generated during high-speed rotation and cutting; Among them, the roof-shaped drill head (100) and the drill cutting main body (200) are formed into an integral body by a sintering process. During sintering, a sintered connection part (300) will be formed between the roof-shaped drill head (100) and the drill cutting main body (200). The sintered connection part (300) includes two parts: one part is horizontally arranged between the bottom surface of the roof-shaped drill head (100) and the drill cutting main body (200), and the other part is vertically arranged in the central area of the drill cutting main body (200); The drill cutting main body (200) includes a first main body part (210) and a second main body part (220), and the first main body part (210) and the second main body part (220) are connected by a sintered connection part (300); The chip contact surface provided by the roof-shaped drill head (100) includes: A first cutting contact surface (110), the first cutting contact surface (110) is parallel to the bottom surface of the roof-shaped drill head (100), and 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-shaped drill head (100), which is used to provide stable cutting contact; A second cutting contact surface (120), one side of the second cutting contact surface (120) is connected to the side of the first main body part (210) away from the sintered connection part (300), the other side of the second cutting contact surface (120) is connected to the side of the second main body part away from the sintered connection part (300), and a platform (221) is reserved at the connection between the second main body part (220) and the second cutting contact surface (120).

2. The roof-type diamond drill bit according to claim 1, characterized in that: The second cutting contact surface (120) is at least one of a straight surface or a curved surface, and the first cutting contact surface (110) is one of a flat surface or a sharp angle.

3. The roof-type diamond bit according to claim 1, characterized in that: When viewed in the top view direction, the second cutting contact surface (120) is in a wave-shaped groove shape. Among them, the drill cutting main body (200) in contact with the groove of the second cutting contact surface (120) also correspondingly forms a semi-cylindrical shape with a groove in the vertical direction.

4. A production method for manufacturing a roof-shaped diamond drill bit according to any one of claims 1-3, characterized in that: It includes the following steps: S1. Preparation step: According to the size specifications of the roof-shaped diamond drill bit to be produced, disassemble the roof-shaped diamond drill bit in the thickness direction into a first pressing sheet (1) and a second pressing sheet (2). The height of the first pressing sheet (1) is the total height of the roof-shaped diamond drill bit including the roof part, and the height of the second pressing sheet (2) is the height of the drill cutting main body. The thickness direction is the vertical direction of the extension direction of the longitudinal section of the cutting teeth; S2. Cold pressing step: Using a cold pressing die of corresponding size, the first pressing sheet (1) and the second pressing sheet (2) are flatly pressed and formed respectively in the following manner: The first pressing sheet (1) is formed to include a roof-shaped drill head (100) and a part of the drill cutting body part (200) connected to a part of the bottom of the roof-shaped drill head (100); The second pressing sheet (2) is formed to include the remaining drill cutting body part (200); S3. Sintering step: Selecting a suitable sintering die, stacking the flatly pressed and formed first pressing sheet (1) and second pressing sheet (2) along the thickness direction, loading them into the die and flatly pressing and sintering them. Among them, the roof-shaped drill head (100) and the drill cutting body part (200) form an integral body through the sintering process. During sintering, a sintering connection part (300) will be formed between the roof-shaped drill head (100) and the drill cutting body part (200); S4. Demolding and inspection step: Demolding to obtain a roof-shaped diamond drill bit, and inspecting its quality according to the quality inspection process. The quality inspection process includes appearance inspection, dimension measurement, hardness test and cutting performance test.

5. The production method of the roof-type diamond drill bit according to claim 4, characterized in that: In the said sintering step, Before sintering, the first pressing sheet (1) integrally forms a roof-shaped drill head (100) and a first main body part (210) of the drill cutting body part (200); the second pressing sheet (2) forms a second main body part (220) of the drill cutting body part (200); After sintering, the first main body part (210) and the second main body part (220) are connected by a sintering connection part (300).

6. The production method of the roof-type diamond drill bit according to claim 4, characterized in that: In the said preparation step, the first pressing sheet (1) and the second pressing sheet (2) have the same length, and the first pressing sheet (1) and the second pressing sheet (2) may have the same or different thicknesses.

7. A production method of a roof-type diamond drill bit according to claim 4, characterized in that: In the said sintering step, the sintering die includes a concave pressing head (4) and a convex pressing head (3) arranged oppositely. The concave pressing head (4) and the convex pressing head (3) are used to apply pressure to the cold pressing sheet to make the cold pressing sheet form during the sintering process. Among them, there is a height difference of 0.2 mm between one end of the concave pressing head (4) and its central position, which is used to accurately position the second pressing sheet during die loading to avoid its small displacement.

8. The production method of a roof-type diamond drill bit according to claim 4, characterized in that: In the said sintering step, the die loading sequence is adjusted according to the size of the sintering die and the product specifications to ensure that the cold pressing sheet is evenly pressed and smoothly formed during the sintering process.

Images