Roof type diamond drill bit and production method thereof

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; the drilling and cutting main body part is connected with the bottom of the roof-shaped drill bit part and used for supporting the roof-shaped drill bit part and bearing pressure and friction force generated in the high-speed rotating and cutting 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] The invention discloses a roof-type diamond drill bit and a production method thereof, belonging to the technical field of diamond tool preparation. Background Art

[0002] As a drilling and cutting tool, the diamond drill bit needs to have the drill teeth welded to the drill bit base when in use. It relies on high-speed rotation while continuously applying downward pressure to achieve drilling and cutting. The conventional diamond drill bit teeth have a rectangular longitudinal section, which is prone to slippage and deviation in the initial use. The roof-type drill bit adds a roof structure to the conventional drill bit, and the contact area with the drilling and cutting object is smaller. The current production process for roof drill bits commonly used in the industry is to cold-press the drilling and cutting body and the roof part separately, and then sinter them through assembly molds.

[0003] The disadvantage of this method is that the cold pressing process is cumbersome and the sintering mold process is relatively difficult. Taking the common 24*4.0*12 roof-type ordered drill bit as an example, two 24*10 ordered cold-pressed sheets need to be pressed as the drilling and cutting body during production, and then the thinner roof part is cold-pressed separately for mold sintering. Since the cold-pressed sheets of the roof part are small and fragile, it brings many inconveniences to the mold installation process; in order to ensure the bonding strength between the roof part and the drilling and cutting body, some companies often add an additional mold closing cold pressing process to press the roof and the drilling and cutting body into one before mold installation and sintering. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a roof-type diamond drill bit and a production method thereof, so as to solve the problems that the manufacturing process of the existing roof drill bit is complicated and the sintering mold assembly process is difficult.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solution: a roof-type diamond drill bit, comprising: A roof-type drill head, the longitudinal section of the teeth of which is a roof-like structure that gradually decreases from the bottom to the head, so as to make the contact area of ​​the roof-type drill head smaller, thereby preventing slippage and deviation, and providing a stable cutting contact surface; A drilling and cutting body, at least a portion of which is connected to the bottom of the roof-type drill head, and is used to provide support for the roof-type drill head and to withstand the pressure and friction generated during high-speed rotation and cutting; Among them, the roof-type drill head and the drilling and cutting main body are formed into a whole through a sintering process. During sintering, a sintered connection part is formed between the roof-type drill head and the drilling and cutting main body. The sintered connection part includes two parts: one part is horizontally arranged between the bottom surface of the roof-type drill head and the drilling and cutting main body, and the other part is vertically arranged in the central area of ​​the drilling and cutting main body.

[0006] Furthermore, the drilling and cutting main body portion includes a first main body portion and a second main body portion, and the first main body portion and the second main body portion are connected via a sintered connection portion.

[0007] Furthermore, the chip contact surface provided by the roof-type drill head includes: A first cutting contact surface, wherein the first cutting contact surface is parallel to the bottom surface of the roof-type drill head, 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-type drill head, and is used to provide stable cutting contact; A second cutting contact surface, one side of the second cutting contact surface is connected to a side of the first main body away from the sintered connection portion, and the other side of the second cutting contact surface is connected to a side of the second main body away from the sintered connection portion, and a platform is reserved at the connection between the second main body and the second cutting contact surface, and the platform is used to achieve precise positioning during the mold installation process, thereby ensuring the flatness and bonding strength of the bottom of the roof-type drill head.

[0008] Furthermore, the second cutting contact surface is at least one of a straight surface and a curved surface, and the first cutting contact surface is one of a plane and a sharp angle.

[0009] Furthermore, the second cutting contact surface is in the shape of a wave groove when viewed from above, wherein the drilling body connected to the groove of the second cutting contact surface is also in the shape of a semi-cylinder with a corresponding groove in the vertical direction.

[0010] Furthermore, when the second cutting contact surface is a curved surface, the curved surface is a curved surface protruding outward, so that the roof-type drill head has better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

[0011] Furthermore, when the second cutting contact surface is a curved surface, the curved surface is an inwardly concave curved surface, so that the cutting edge strength of the roof-type drill head is enhanced during the cutting process, and chip control is improved at the same time, reducing friction and heat accumulation between the chips and the first cutting contact surface.

[0012] A method for producing a roof-type diamond drill bit comprises the following steps: S1. Preparation step: according to the size specification of the roof-type diamond drill bit to be produced, the roof-type diamond drill bit is disassembled into a first pressing sheet and a second pressing sheet in the thickness direction, the height of the first pressing sheet is the total height of the roof-type diamond drill bit including the roof part, and the height of the second pressing sheet is the height of the drilling body, wherein the thickness direction is the vertical direction of the extension direction of the longitudinal section of the cutter teeth; S2, cold pressing step: using a cold pressing mold of corresponding size, the first pressed sheet and the second pressed sheet are respectively flat pressed in the following manner: The first pressing sheet is formed to include a roof-type drill head and a portion of a drilling body connected to a portion of a bottom of the roof-type drill head; The second pressing sheet is formed to include the remaining drilling and cutting main body; S3, sintering step: selecting a suitable sintering mold, stacking the first pressed sheet and the second pressed sheet after flat pressing in the thickness direction, and flat pressing and sintering them, wherein the roof-type drill head and the drilling and cutting main body are formed into a whole through the sintering process, and during sintering, a sintered connection portion is formed between the roof-type drill head and the drilling and cutting main body; S4, demoulding inspection step: demoulding to obtain the roof-type diamond drill bit, and inspecting its quality according to the quality inspection process.

[0013] Furthermore, in the sintering step, Before sintering, the first pressing sheet integrally forms the roof-type drill head and the first main body of the drilling and cutting main body; the second pressing sheet forms the second main body of the drilling and cutting main body; After sintering, the first main body portion and the second main body portion are connected via a sintered connecting portion.

[0014] Furthermore, in the preparation step, the first pressed sheet and the second pressed sheet have the same length, and the first pressed sheet and the second pressed sheet have the same or different thicknesses.

[0015] Furthermore, in the sintering step, the sintering mold includes a concave pressure head and a convex pressure head that are relatively arranged, and 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, wherein 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 when installing the mold to avoid slight displacement thereof.

[0016] Furthermore, in the sintering step, the first pressed sheet and the second pressed sheet are stacked in the thickness direction, molded, and then flat-pressed and sintered, and the product is shaped to the desired size by means of the selected sintering mold.

[0017] 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 sheets are evenly compressed and smoothly formed during the sintering process.

[0018] Furthermore, in the sintering step, a temperature gradient control is provided during the sintering process so that the mold and the cold-pressed sheet are evenly heated from room temperature to the sintering temperature, thereby avoiding product defects caused by excessive temperature gradient.

[0019] Furthermore, in the demoulding detection step, the roof-type diamond drill bit after demoulding needs to undergo quality inspection procedures such as appearance inspection, size measurement, hardness test and cutting performance test to ensure that the product quality meets the standard requirements.

[0020] Furthermore, the appearance inspection includes checking the drill bit surface for defects such as cracks, pores, inclusions, etc. through visual inspection or a low-power magnifying glass, and checking whether the joint between the roof part and the cutting body part is tight, and whether there is any delamination or looseness. The dimension measurement includes measuring the length, height and thickness of the drill bit using high-precision measuring tools to ensure that it meets the requirements of the design drawings. The accuracy requirements for different parts are different.

[0021] Furthermore, the hardness test is performed by using a hardness tester to perform hardness tests on the cutting part and the base part of the drill bit respectively 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 installing the drill bit on a special cutting test equipment and performing a cutting test according to specified cutting parameters to observe the stability, cutting force, cutting temperature and other performance indicators of the drill bit during the cutting process.

[0022] The beneficial effects of the present invention are: 1. The present application simplifies the production process by combining two drilled and cut main body cold-pressed sheets and one roof part cold-pressed sheet in the conventional process into two cold-pressed sheets, one large and one small, which are directly hot-pressed using a sintering mold, thereby reducing the number of cold-pressed sheets from three to two. The simplified process flow reduces the operating steps and the difficulty of mold installation, making the production process more efficient, and being able to quickly complete the entire production process from cold pressing to sintering, thereby improving the production efficiency of the product.

[0023] 2. This application reduces the manpower, material and time costs in the production process by reducing the number of cold-pressed sheets and simplifying the mold assembly process. At the same time, it improves the bonding strength between the roof part and the cutting body part, reduces the product scrap rate, and further reduces the production cost.

[0024] 3. The method provided in this application does not require the production of small and fragile cold-pressed sheets of the roof part, which reduces the production difficulty and avoids production problems caused by the fragility of the cold-pressed sheets of the roof part. During the sintering process, there is no need to consider the bonding strength of the roof part. 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

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A roof-type diamond drill bit produced by using a production method of a roof-type diamond drill bit provided by the present invention; Figure 2It is a schematic structural diagram of a roof-type diamond drill bit according to the present invention, taken along the section AA' (the section AA' is also referred to as the longitudinal section of the cutter teeth); Figure 3 A schematic flow chart of a production method of a roof-type diamond drill bit according to the present invention; Figure 4 It is a flow chart of the quality inspection process in the present invention; Figure 5 The schematic diagram of the structure of the first pressing tablet and the second pressing tablet of the present invention is Figure 6 It is a structural schematic diagram of a production method of a roof-type diamond drill bit of the present invention; Figure 7 A schematic cross-sectional view of a roof-type diamond drill bit A of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of a roof-type diamond drill bit B of the present invention; Fig. 9 It is a schematic diagram of the cross-sectional structure of a roof-type diamond drill bit C of the present invention; Fig.10 It is a schematic diagram of the cross-sectional structure of a roof-type diamond drill bit D of the present invention; Fig.11 This is a schematic diagram of a roof-type diamond drill bit E in the present invention; Fig.12 Schematic diagram of the top view of the diamond drill bit E; Fig.13 It is a schematic diagram of the cross-sectional structure of the diamond drill bit E.

[0026] The reference numerals in the drawings are respectively: 1, first pressing sheet; 2, second pressing sheet; 3, convex pressure head; 4, concave pressure head; 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 DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] like Figure 1 and Figure 2 As shown, the present application provides a roof-type diamond drill bit, which includes: A roof-type drill head 100, wherein the longitudinal section of the teeth of the roof-type drill head 100 is a roof-like structure that gradually decreases in the direction extending from the bottom to the head, so as to make the contact area of ​​the roof-type drill head 100 smaller, thereby preventing slippage and deviation, and providing a stable cutting contact surface; A drilling and cutting body 200, at least a portion of which is connected to the bottom of the roof-type drill head 100, and is used to provide support for the roof-type drill head 100, and is used to withstand the pressure and friction generated during high-speed rotation and cutting; Among them, the roof-type drill head 100 and the drilling and cutting main body 200 are formed into a whole through a sintering process. During sintering, a sintered connecting part 300 is formed between the roof-type drill head 100 and the drilling and cutting main body 200. The sintered connecting part 300 includes two parts: one part is horizontally arranged between the bottom surface of the roof-type drill head 100 and the drilling and cutting main body 200, and the other part is vertically arranged in the central area of ​​the drilling and cutting main body 200.

[0029] In order to improve the structural stability and service life of the drill bit, the drilling body 200 includes a first body 210 and a second body 220 , and the first body 210 and the second body 220 are connected via a sintered connection 300 .

[0030] In order to optimize cutting performance and reduce stress concentration, the chip contact surface provided by the roof-type drill head 100 includes: A first cutting contact surface 110, wherein the first cutting contact surface 110 is parallel to the bottom surface of the roof-type 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-type drill head 100, and 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 a side of the first main body 210 away from the sintered connection portion 300, and the other side of the second cutting contact surface 120 is connected to a side of the second main body away from the sintered connection portion 300, and a platform 221 is reserved at the connection between the second main body 220 and the second cutting contact surface 120, and the platform 221 is used to achieve precise positioning during the mold installation process, thereby ensuring the flatness and bonding strength of the bottom of the roof-type drill head 100.

[0031] In order to adapt to different cutting requirements and material properties, the second cutting contact surface 120 is at least one of a straight surface and a curved surface, and the first cutting contact surface 110 is one of a plane and a sharp angle.

[0032] In order to optimize cutting performance and adapt to different cutting scenarios, the second cutting contact surface 120 is in the shape of a wavy groove when viewed from above, wherein the drilling body 200 connected to the groove of the second cutting contact surface 120 is also formed in a semi-cylindrical shape with a corresponding groove in the vertical direction.

[0033] 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-type drill head 100 has better guiding performance during the cutting process, reduces vibration and deviation, and improves cutting accuracy and stability.

[0034] 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 an inwardly concave curved surface, so that the cutting edge strength of the roof-type drill head 100 is enhanced during the cutting process, and at the same time the chip control is improved, and the friction and heat accumulation between the chips and the first cutting contact surface 110 are reduced.

[0035] The roof portion of the roof-type diamond drill bit provided in the present application has a smaller contact area with the drilling object, and the roof-type diamond drill bit is not prone to slipping and deflection during use, which can improve the accuracy and stability of drilling; the optimized roof structure design makes the roof-type diamond drill bit more efficient during the cutting process, reduces the cutting force and cutting temperature, and extends 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.

[0036] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in order to improve production efficiency, the present invention provides a technical solution for a production method of a roof-type diamond drill bit, which comprises the following steps: S1. Preparation step: according to the size specification of the roof-type diamond drill bit to be produced, the roof-type diamond drill bit is disassembled into a first pressing sheet 1 and a second pressing sheet 2 in the thickness direction, the height of the first pressing sheet 1 is the total height of the roof-type diamond drill bit including the roof part, and the height of the second pressing sheet 2 is the height of the drilling body, wherein the thickness direction is the vertical direction of the extension direction of the longitudinal section of the cutter teeth; S2, cold pressing step: using a cold pressing mold of corresponding size, the first pressed sheet 1 and the second pressed sheet 2 are respectively flat pressed in the following manner: The first pressing sheet 1 is formed to include a roof-type drill portion 100 and a portion of a drilling body portion 200 connected to a portion of the bottom of the roof-type drill portion 100; The second pressing sheet 2 is formed to include the remaining drilling and cutting main body 200; S3, sintering step: selecting a suitable sintering mold, stacking the first pressed sheet 1 and the second pressed sheet 2 in the thickness direction and sintering them, wherein the roof-type drill head 100 and the drilling body 200 are formed into a whole through the sintering process, and a sintering connection portion 300 is formed between the roof-type drill head 100 and the drilling body 200 during sintering; S4, demoulding inspection step: demoulding to obtain the roof-type diamond drill bit, and inspecting its quality according to the quality inspection process.

[0037] In order to improve the strength and reliability of the connection, during the sintering step, Before sintering, the first pressing sheet 1 is formed integrally with the roof-type drill head 100 and the first main body 210 of the drilling and cutting main body 200; the second pressing sheet 2 is formed with the second main body 220 of the drilling and cutting main body 200; After sintering, the first body portion 210 and the second body portion 220 are connected via a sintered connection portion 300 .

[0038] In order to ensure the molding of the cold-pressed sheet, in the sintering step, the sintering mold includes a concave pressure head 4 and a convex pressure head 3 arranged relatively to each other, and the concave pressure head 4 and the convex pressure head 3 are used to apply pressure to the cold-pressed sheet so that the cold-pressed sheet is formed during the sintering process, wherein there is a height difference of 0.2 mm between one end of the concave pressure head 4 and its center position, which is used to accurately position the second pressing sheet 2 when installing the mold to avoid slight displacement thereof.

[0039] In order to ensure the size and quality of the product, in the sintering step, the first pressed sheet 1 and the second pressed sheet 2 are stacked in the thickness direction and then pressed flat and sintered, and the product is shaped to the required size by the selected sintering mold.

[0040] In order to ensure uniform heating during the sintering process, 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 smoothly formed during the sintering process.

[0041] In order to avoid cracking or deformation due to excessive temperature difference, in the sintering step, a temperature gradient control is also provided during the sintering process so that the mold and the cold pressed sheet are evenly heated from room temperature to the sintering temperature to avoid product defects caused by excessive temperature gradient.

[0042] In order to ensure that the product quality meets the standards, in the demoulding inspection step, the roof-type diamond drill bit after demoulding must also undergo quality inspection procedures such as appearance inspection, size measurement, hardness test and cutting performance test to ensure that the product quality meets the standard requirements.

[0043] In order to ensure the surface quality of the drill bit and the tight connection of various parts, the appearance inspection is carried out by visual inspection or low-power magnifying glass to check whether there are defects such as cracks, pores, inclusions, etc. on the surface of the drill bit, and check whether the connection between the roof part and the cutting body part is tight, and whether there is any delamination or looseness. The size measurement is carried out by 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 precision requirements for different parts are different.

[0044] In order to ensure the cutting performance and service life of the drill bit, the hardness test is carried out by using a hardness tester to test the cutting part and the base part of the drill bit respectively 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 carried out by installing the drill bit on a special cutting test equipment, and a cutting test is carried out according to the specified cutting parameters to observe the stability, cutting force, cutting temperature and other performance indicators of the drill bit during the cutting process.

[0045] In the present application, the first pressed sheet 1 may also be referred to as a large cold pressed sheet, and the second pressed sheet 2 may also be referred to as a small cold pressed sheet. The first pressed sheet 1 has a size of 24 mm*12 mm, and the second pressed sheet 2 has a size of 24 mm*10 mm. Figure 2 As shown in the cross-sectional view, a portion of the first pressing piece 1 is the roof-type drill portion 100 , another portion is the first main body portion 210 , and the second pressing piece 2 is the second main body portion 220 .

[0046] The present application reserves a 0.2 mm platform 221 on the side where the second main body 220 is connected to the second cutting contact surface 120. The function of the platform 221 is to facilitate the positioning of the small cold-pressed sheet during the mold installation process to prevent it from making small displacements that affect the flatness of the bottom plane of the drill bit or create gaps.

[0047] The present application simplifies the production process by combining the two drilled and cut main body cold-pressed sheets and one roof part cold-pressed sheet in the conventional process into two cold-pressed sheets, one large and one small, which are directly hot-pressed using a sintering mold, thereby reducing the number of cold-pressed sheets from three to two. The simplified process flow reduces the operating steps and the difficulty of mold installation, making the production process more efficient, and being able to quickly complete the entire production process from cold pressing to sintering, thereby improving the production efficiency of the product.

[0048] The present application reduces the manpower, material and time costs in the production process by reducing the number of cold-pressed sheets and simplifying the mold assembly process, while improving the bonding strength between the roof part and the cutting body part, reducing the product scrap rate, and further reducing the production cost.

[0049] The method provided in the present application does not require the production of small and fragile cold-pressed roof part sheets, which reduces the production difficulty and avoids production problems caused by the fragility of the cold-pressed roof part sheets. During the sintering process, there is no need to additionally consider the bonding strength of the roof part. 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.

[0050] The sintered connection part 300 in the present application refers to when the temperature reaches the sintering temperature (usually between 800-1000°C), the temperature is maintained for a period of time (usually between 1 minute and 10 minutes), during which the contact surface between the pressed pieces migrates through grain boundary diffusion to form the sintered connection part 300. This diffusion process allows the first pressed piece 1 and the second pressed piece 2 to form a firm bond at the contact surface. After sintering, the temperature is gradually lowered so that the sintered connection part 300 gradually remains stable during the cooling process. After cooling to room temperature, it is demolded from the sintering mold to obtain a complete roof-type diamond drill bit. At this time, the first pressed piece 1 and the second pressed piece 2 have been firmly combined together through the sintered connection part 300 to form a whole.

[0051] The target roof-type drill bit size specification in the present application is length*thickness*height. The drill bit is disassembled into a first pressed sheet 1 and a second pressed sheet 2 in the thickness direction. The cold pressed sheet sizes mentioned in the following embodiments are all theoretical design sizes of the product. In the actual production process, due to the influence of the cold pressing process and equipment, the different densities of the pressed embryos result in different heights of the cold pressed sheets in the pressure direction. The product needs to be nearly fully densified through a sintering process to reach the theoretical design size.

[0052] Embodiment 1: The roof-type drill bit product specifications produced in this embodiment are 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, wherein the height of the cutting body part is 10 mm, and the height of the roof part is 2 mm. The production is carried out according to the following method: S1. According to the product specifications of the target production object, the drill bit is disassembled into a first pressing sheet 1 of theoretical size 24*2.5*12 and a second pressing sheet 2 of theoretical size 24*2.5*10 in thickness direction; S2. After calculating the material weight according to the theoretical size, use the cold pressing equipment to produce the two types of cold pressed sheets mentioned in S1 above; S3, using a φ200 drill sintering mold to stack the two cold pressed sheets produced in S2 in the thickness direction and press them flat for sintering, wherein the mold loading order from bottom to top is concave pressing head 4-second pressing sheet 2-first pressing sheet 1-convex pressing head 3; S4. After sintering, demoulding is performed to obtain a φ200-24*5.0*(10+2) roof-type drill bit.

[0053] The design of the mold loading sequence of this embodiment 1 is to ensure that the first pressed sheet 1 can be smoothly bent and broken during the sintering process to fill the mold cavity of the roof part, while the second pressed sheet 2 provides support in the middle to ensure the bonding strength.

[0054] Embodiment 2: The roof-type drill bit product specifications produced in this embodiment are 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, the height of the cutting body part is 10 mm, and the height of the roof part is 2 mm. It is produced according to the following method: S1. According to the product specifications of the target production object, the drill bit is disassembled into a first pressing sheet 1 of theoretical size 24*2.0*12 and a second pressing sheet 2 of theoretical size 24*1.5*10 from the thickness direction; S2. After calculating the material weight according to the theoretical size, use the cold pressing equipment to produce the two types of cold pressed sheets mentioned in S1 above; S3, using a φ50 drill sintering mold to stack the two cold pressed sheets produced in S2 in the thickness direction and press them flat for sintering, wherein the order of the mold loading from bottom to top is convex pressing head 3-second pressing sheet 2-first pressing sheet 1-concave pressing head 4; S4. After sintering, demoulding is completed to obtain a φ50-24*3.5*(10+2) roof-type drill bit.

[0055] The design of the mold loading sequence of 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, so as to avoid deformation or loose bonding due to uneven pressure.

[0056] Embodiment 3: The roof drill bit product specifications 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 body part is 10 mm, and the height of the roof part is 1 mm. It is produced according to the following method: S1. According to the product specifications of the target production object, the drill bit is disassembled into a first pressing sheet 1 of theoretical size 24*2.0*11 and a second pressing sheet 2 of theoretical size 24*2.0*10 from the thickness direction; S2, after calculating the material weight according to the theoretical size, use the cold pressing equipment to produce the two types of cold pressed sheets mentioned in S1 above; S3, using a φ150 drill sintering mold to stack the two cold pressed sheets produced in S2 in the thickness direction and press them flat for sintering, wherein the order of the mold loading from bottom to top is concave pressing head 4 - first pressing sheet 1 - second pressing sheet 2 - convex pressing head 3; S4. After sintering, demoulding is completed to obtain a φ150-24*4.0*(10+1) roof-type drill bit.

[0057] The design of the mold loading sequence of this embodiment 3 is to ensure that the first pressed sheet 1 can be bent and broken smoothly during the sintering process at a relatively small roof height, while the second pressed sheet 2 provides support at the top to ensure the stability of the overall structure.

[0058] The temperature gradient control in this application refers to the precise management of the heating rate during the sintering process so that the mold and the cold-pressed sheet are heated evenly and gradually from room temperature to the sintering temperature. Specifically, the temperature is gradually increased at a lower heating rate (such as 5 to 10 degrees Celsius per minute) to avoid rapid temperature changes. This can prevent the cold-pressed sheet from cracking or deforming due to concentrated thermal stress, ensure uniform heating, maintain the stability of the structure and performance, thereby improving the sintering quality and reducing product defects.

[0059] In the present application, the designs of the first cutting contact surface 110 and the second cutting contact surface 120 of the roof-type diamond drill bit have various variations to adapt to different cutting requirements and workpiece materials.

[0060] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, in the present application, the second cutting contact surface 120 can be any two of a straight bevel, an inner concave arc surface, and an outer convex arc surface, or any combination of any one of them. The straight bevel surface can provide uniform cutting depth and stable cutting force, and is suitable for processing general materials; the inner concave arc surface helps to reduce the contact area between the cutting edge and the workpiece, lower the cutting temperature, and is suitable for high-speed cutting; the outer convex arc surface can increase the strength of the cutting edge, and is suitable for heavy-load cutting and processing of hard materials.

[0061] In addition, in the present application, the first cutting contact surface 110 can be a plane or a sharp angle. The plane design helps to provide stable cutting contact and a larger contact area, which is suitable for the processing of soft materials; while the sharp angle design can concentrate the cutting force and increase the local pressure, which is suitable for the cutting of hard materials.

[0062] like Fig.11 , Fig.12 and Fig.13 As shown, as an extended example of the present application, a roof-type 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 discharge during the cutting process, reduce heat accumulation and chip accumulation during the cutting process, and improve cutting efficiency and processing quality.

[0063] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0064] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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), wherein the longitudinal section of the teeth of the roof-type drill head (100) is a roof-like structure that gradually decreases in the direction extending from the bottom to the head, so as to make the contact area of ​​the roof-type drill head (100) smaller, thereby preventing slippage and deviation, and providing a stable cutting contact surface; A drilling and cutting body (200), at least a portion of which is connected to the bottom of the roof-type drill head (100), and is used to provide support for the roof-type drill head (100) and to withstand the pressure and friction generated during high-speed rotation and cutting; The roof-type drill head (100) and the drilling 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 head (100) and the drilling body (200). The sintered connection part (300) comprises two parts: one part is horizontally arranged between the bottom surface of the roof-type drill head (100) and the drilling body (200), and the other part is vertically arranged in the central area of ​​the drilling body (200).

2. The roof-type diamond drill bit according to claim 1, characterized in that: The drilling and cutting main body (200) comprises a first main body (210) and a second main body (220); the first main body (210) and the second main body (220) are connected via a sintered connection part (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 head (100) comprises: A first cutting contact surface (110), the first cutting contact surface (110) being 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 being smaller than the width of the bottom surface of the roof-type drill head (100), and being used to provide stable cutting contact; A second cutting contact surface (120), one side of the second cutting contact surface (120) is connected to a side of the first main body (210) away from the sintered connection portion (300), the other side of the second cutting contact surface (120) is connected to a side of the second main body away from the sintered connection portion (300), and a platform (221) is reserved at the connection between the second main body (220) and the second cutting contact surface (120), the platform (221) being 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).

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 and a curved surface, and the first cutting contact surface (110) is one of a plane and a sharp angle.

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

6. A method for producing a roof-type diamond drill bit according to any one of claims 1 to 5, characterized in that: It includes the following steps: S1. Preparation step: according to the size specification of the roof-type diamond drill bit to be produced, the roof-type diamond drill bit is disassembled into a first pressing plate (1) and a second pressing plate (2) in the thickness direction, wherein the height of the first pressing plate (1) is the total height of the roof-type diamond drill bit including the roof portion, and the height of the second pressing plate (2) is the height of the drilling body, wherein the thickness direction is the direction perpendicular to the extension direction of the longitudinal section of the cutter teeth; S2, cold pressing step: using a cold pressing mold of corresponding size, the first pressed sheet (1) and the second pressed sheet (2) are respectively flat pressed in the following manner: The first pressing sheet (1) is formed to include a roof-type drill head (100) and a portion of a drilling body (200) connected to a portion of the bottom of the roof-type drill head (100); The second pressing sheet (2) is formed to include the remaining drilling and cutting main body (200); S3, sintering step: selecting a suitable sintering mold, stacking the first pressed sheet (1) and the second pressed sheet (2) in the thickness direction and sintering them flat, wherein the roof-shaped drill head (100) and the drilling body (200) are formed into a whole through a sintering process, and during sintering, a sintered connection portion (300) is formed between the roof-shaped drill head (100) and the drilling body (200); S4, demoulding inspection step: demoulding to obtain the roof-type diamond drill bit, and inspecting its quality according to the quality inspection process, wherein the quality inspection process includes appearance inspection, size measurement, hardness test and cutting performance test.

7. The method for producing a roof-type diamond drill bit according to claim 6, characterized in that: In the sintering step, Before sintering, the first pressed sheet (1) integrally forms the roof-type drill head (100) and the first main body (210) of the drilling and cutting main body (200); the second pressed sheet (2) forms the second main body (220) of the drilling and cutting main body (200); After sintering, the first main body portion (210) and the second main body portion (220) are connected via a sintered connection portion (300).

8. The method for producing a roof-type diamond drill bit according to claim 6, characterized in that: In the preparation step, the first pressed sheet (1) and the second pressed sheet (2) have the same length, and the first pressed sheet (1) and the second pressed sheet (2) have the same or different thicknesses.

9. The method for producing a roof-type diamond drill bit according to claim 6, characterized in that: In the sintering step, the sintering mold comprises a concave pressing head (4) and a convex pressing head (3) arranged opposite to each other, wherein the concave pressing head (4) and the convex pressing head (3) are used to apply pressure to the cold pressed sheet so that the cold pressed sheet is formed during the sintering process, wherein there is a height difference of 0.2 mm between one end of the concave pressing head (4) and its center position, which is used to accurately position the second pressed sheet when the mold is installed to avoid slight displacement thereof.

10. The method for producing a roof-type diamond drill bit according to claim 6, characterized in that: 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 evenly compressed and smoothly formed during the sintering process.

Images