A cutting edge replaceable cone drill bit

Abstract

This disclosure relates to the field of drill bit technology. One embodiment of this disclosure provides a pagoda drill bit with replaceable cutting edges, comprising a drill bit body, a drilling section, and a drill shank. The drilling section is frustoconical and composed of multiple trapezoidal sections of different diameters. The drill shank is located on the bottom surface of the drilling section and is coaxial with the drilling section. The drilling section has several mounting grooves. The cutting edge is detachably disposed in the mounting grooves. The cutting edge is flat and has a first chip removal groove. The cutting edge is used to cut the workpiece to be drilled, ensuring stable drilling by the pagoda drill bit. This technical solution solves the problem in related technologies where the cutting edge of an integral pagoda drill bit becomes worn and drilling cannot continue, requiring the replacement of the entire drill bit, resulting in significant material waste.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of drill bit technology, and more specifically, to a pagoda drill bit with replaceable cutting edges. Background Technology

[0002] Pivot drills, also known as step drills, are primarily used for drilling holes in thin plates. Traditional drills often require changing multiple drill bits of different diameters to machine holes of different sizes, which is cumbersome and inefficient. Pivot drills, on the other hand, can replace multiple drill bits, machine holes of different diameters as needed, and can even machine large holes in one go, eliminating the need for frequent drill bit changes and drilling locating holes, thus greatly improving drilling efficiency.

[0003] In drilling operations, the tip of a pagoda drill is relatively fragile and prone to breakage. Furthermore, its cutting edge wears down after continuous drilling, requiring a stoppage and replacement before resuming work. However, the disassembly and assembly process of existing pagoda drills is cumbersome, and only the cutting edge wears down; replacing the entire drill bit after each failure increases processing costs. Traditional pagoda drills are typically of a single, integral structure. When part of the cutting edge is damaged due to wear or breakage, the entire drill bit becomes unusable and must be replaced, resulting in material waste, increased processing costs, and reduced drill bit utilization. To solve this problem, replaceable-edge pagoda drills have emerged. By replacing the damaged cutting edge instead of the entire drill bit, tool utilization is improved and costs are reduced. Utility Model Content

[0004] To overcome the above-mentioned defects, the embodiments of this disclosure provide a pagoda drill bit with replaceable cutting edges, which solves the technical problem in the prior art where the cutting edges of an integral pagoda drill bit cannot continue drilling after some of them are worn, and the drill bit must be replaced as a whole, resulting in a large waste of materials.

[0005] According to one aspect, at least one embodiment of this disclosure provides a pagoda drill bit with replaceable cutting edges, comprising:

[0006] The drill bit body has a drilling section and a drill shank. The drilling section is composed of multiple stepped platforms with gradually increasing diameters. The drill shank is located on the bottom surface of the drilling section and is coaxial with the drilling section. The drilling section has several mounting grooves.

[0007] The cutting edge is detachably disposed in the mounting slot. The cutting edge is flat and has a first chip removal groove. The cutting edge is used to cut the workpiece that needs to be drilled.

[0008] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, which further includes:

[0009] A plurality of fastening screws are provided, the fastening screws passing through the cutting edge and detachably mounted on the drilling part, the fastening screws being used to fix the cutting edge on the drilling part.

[0010] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, wherein the height of the different ladders is the same.

[0011] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, wherein the diameter of the stepped platform gradually increases along the direction close to the drill shank, and the diameter of the stepped platform is arranged in an arithmetic sequence.

[0012] For example, at least one embodiment of this utility model provides a pagoda drill bit with a replaceable cutting edge, wherein the tip of the cutting edge is conical.

[0013] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, wherein the drill shank has multiple different clamping surfaces, which are used to assist the clamping device in fixing the drill shank.

[0014] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, wherein one end of each of the different ladders has a transition slope, the transition slope is used to connect two adjacent different ladders, and the inclination angle of the transition slope is between 90° and 150°.

[0015] For example, at least one embodiment of this utility model provides a pagoda drill bit with replaceable cutting edges, wherein the fastening screws are installed on the side wall of the first cutting groove and arranged in a circumferential array.

[0016] The beneficial effects of the embodiments disclosed herein are as follows:

[0017] The pagoda drill bit disclosed herein, when its cutting edge wears or breaks after long-term use, only requires replacement of the cutting edge to resume operation. Replacing only the cutting edge reduces manufacturing costs for drill bit manufacturers and saves on the use of cemented carbide materials. Users only need to purchase the cutting edge, saving on procurement costs. Furthermore, the replacement process is simpler than the traditional method of replacing the entire drill bit. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, without creative effort, they can also...

[0019] Other drawings are obtained based on the content of the exemplary embodiments of this utility model and these drawings.

[0020] Figure 1 This is a schematic diagram of a pagoda drill bit with replaceable cutting edge in one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A structural schematic diagram from another perspective in the embodiment;

[0022] Figure 3 for Figure 1 Cross-sectional view at AA in the embodiment;

[0023] Figure 4 for Figure 1 A schematic diagram of the drill bit body in the embodiment;

[0024] Figure 5 for Figure 1 A front view of the drill bit body in the embodiment;

[0025] Figure 6 for Figure 1 A top view of the drill bit body in the embodiment;

[0026] Figure 7 for Figure 1 The front view of the cutting edge in the embodiment;

[0027] Figure 8 for Figure 1 The top view of the cutting edge in the embodiment.

[0028] In the figure: 100, drill bit body; 110, drilling section; 120, drill shank; 111, ladder; 112, mounting slot; 200, cutting edge; 210, first chip removal groove; 300, fastening screw; 113, second chip removal groove; 121, clamping surface; 114, transition slope. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0030] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-8As shown, this illustration depicts a replaceable-cutting-edge pagoda drill bit according to one embodiment of this disclosure. In some examples, the drilling section 110 is frustum-shaped, composed of multiple trapezoidal steps 111 of different diameters, with an external shape identical to that of a traditional pagoda drill bit, enabling it to process holes of different diameters. The multiple trapezoidal steps 111 can sequentially drill thin plates, eliminating the need for frequent changes to drill bits of different diameters, thus improving the drill bit's applicability and drilling efficiency. The drilling section 110 is provided with several mounting slots 112 for mounting the cutting edge 200. The mounting slots 112 ensure that the cutting edge 200 is securely mounted, bearing the cutting force during drilling without displacement, thus guaranteeing drilling stability. The drill shank 120 is located on the bottom surface of the drilling section 110 and is coaxial with it, ensuring power transmission and positioning of the drill bit. The drill shank 120 can be connected to the power output end of drilling equipment such as a drilling machine, transmitting the rotational power of the equipment to the drilling section 110 to achieve drilling operations.

[0036] In this design, the drill bit body 100 is made of common alloy steel. After heat treatment, the hardness and toughness of the alloy steel are significantly improved, effectively ensuring the service life of the drill bit body 100. The length of the drilling section 110 is determined based on the common thickness range of thin plates, generally between 10 and 50 mm. The height between the steps 111 is determined by the thickness of different thin plates, typically between 2 and 5 mm. Different thicknesses of materials require different step heights for the drill bits. Thick plates require drill bits with higher step heights, while thin plates do not require drill bits with excessively high step heights. The flat cutting edge 200, after being installed in the mounting slot 112, conforms to the shape of the drilling section 110, and the cutting edge performs the cutting function. The first chip removal groove 210 on the cutting edge 200 ensures that the cut chips are discharged during cutting, avoiding problems such as rough drilling surface and accelerated drill bit wear caused by chip accumulation, thus improving drilling quality and drill bit service life. The cutting edge 200 is made of high-performance cemented carbide or high-speed steel, enabling drilling not only on common metal sheets but also on marble, composite panels, and other materials, thus expanding the drill bit's versatility. Over long-term use, pagoda drill bits inevitably wear down. Existing pagoda drill bits require complete disassembly and replacement before continued operation. However, the pagoda drill bit in this solution only requires replacement of the cutting edge 200. Replacing only the cutting edge 200 reduces manufacturing costs for the drill bit manufacturer and saves on cemented carbide material. There are no similar clip-mounted pagoda drill bits in existing technology. Users only need to purchase the cutting edge 200, saving on procurement costs. Furthermore, when replacement is needed, users can switch from replacing the entire drill bit to replacing only the cutting edge 200, simplifying the process. The use of a detachable cutting edge significantly reduces the raw material cost per production run, benefiting business development.

[0037] Furthermore, in practical use, after the cutting edge 200 is installed, it is firmly fixed in the mounting groove 112 of the drilling section 110 by tightening the screws. This connection method ensures that the cutting edge 200 maintains a stable position without loosening or displacement when subjected to axial force, radial force, and torque during drilling. The detachable fastening method makes the replacement of the cutting edge 200 simple and easy, requiring no complicated tools. Operators can easily remove the worn cutting edge 200 and replace it with a new one by simply unscrewing the fastening screws 300 with a common screwdriver or wrench, shortening the replacement time and improving production efficiency.

[0038] Furthermore, in this design, the first chip removal groove 210 is located on the cutting edge 200, directly contacting the chips generated during cutting, and is responsible for the initial collection and guidance of chip removal. The second chip removal groove 113 is located on the drilling section 110 and is connected to the first chip removal groove 210, forming a continuous chip removal channel. During the rotation of the drill bit, centrifugal force and airflow provide power for chip removal. The rotation of the cutting edge 200 causes the chips to be subjected to centrifugal force, tending to move away from the drill bit axis. The inclination angle of the first chip removal groove 210 and the second chip removal groove 113, as well as the airflow generated by the rotation of the drill bit, further guide the chips to be discharged along the chip removal channel, ensuring a smooth chip removal process. Through the interconnected design of the first chip removal groove 210 and the second chip removal groove 113, the chip removal performance of the replaceable cutting edge pagoda drill bit is significantly optimized during the drilling process, improving drilling efficiency.

[0039] Furthermore, the production process is simpler with ladders 111 of the same height. Since the height of the ladders 111 is uniform, more standardized processing techniques and molds can be used when manufacturing the drill bit body 100. This simplified manufacturing process shortens the production cycle of the drill bit body 100, enabling faster fulfillment of market demands.

[0040] Furthermore, the diameter of the step-like platforms 111 gradually increases along the direction close to the drill shank 120. The smaller diameter platforms 111 cut into the workpiece first, and as the drill bit penetrates deeper, the larger diameter platforms 111 participate in drilling sequentially, achieving a gradual increase in hole diameter. This design ensures that each platform 111 effectively cuts the material during drilling, avoiding cutting difficulties or drill bit damage caused by unreasonable diameter variations. The arithmetic sequence arrangement of the platform diameters makes the hole diameter variation more regular. This helps operators select the appropriate platform 111 for drilling more accurately based on the required hole diameter. Simultaneously, the arithmetic sequence design facilitates dimensional accuracy control during manufacturing; the diameter of each platform 111 can be determined through simple mathematical calculations, which is beneficial for improving production efficiency and product quality.

[0041] The amount and shape of iron filings produced during drilling may vary slightly depending on the diameter of the stepper 111. However, since the diameter of the stepper 111 changes in a regular pattern, the design of the chip removal groove can better adapt to this variation. The size and inclination angle of the first chip removal groove 210 and the second chip removal groove 113 can be optimized according to the variation of the diameter of the stepper 111 to ensure that iron filings can be smoothly discharged when drilling with different stepper 111s.

[0042] Furthermore, the conical cutting edge 200 has a sharp apex angle, which allows it to penetrate the workpiece material more easily when the drill bit begins drilling, reducing initial cutting resistance. Compared to other tip shapes, the conical tip can concentrate the applied axial force on a smaller area, generating greater pressure, thus penetrating the workpiece surface more effectively and making the drilling process smoother. The size of the cone angle is determined based on the properties and thickness of the material being processed. For softer sheet materials, such as aluminum alloy sheets, the cone angle can be relatively small, generally between 30° and 60°, making the tip sharper and easier to cut into the material.

[0043] Furthermore, multiple different clamping surfaces 121 increase the contact area between the drill shank 120 and the clamping device. Through the principle of friction, the clamping device can more firmly fix the drill shank 120. The different clamping surfaces 121 can adapt to the clamping method of the clamping device, ensuring that the drill bit will not loosen due to axial force, radial force, and torque during drilling, thus guaranteeing smooth drilling operations. The different clamping surfaces 121 can also serve as positioning markers, helping operators to quickly and accurately install the drill bit into the clamping device and ensuring the correct installation position. This helps improve installation efficiency and reduce problems such as drilling deviation or drill bit damage caused by improper installation.

[0044] Furthermore, in actual production, when the drill bit transitions from one step 111 to another for drilling, the transition slope 114 acts as a buffer and guide. During drilling, the drill bit continuously rotates and applies axial force. If the steps 111 are directly connected, the cutting force will change instantaneously, potentially causing drill bit vibration, unstable cutting, and even affecting drilling quality. The transition slope 114 allows for a smooth transition of cutting force, reducing such abrupt changes and ensuring the continuity and stability of the drilling process.

[0045] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A pagoda drill bit with replaceable cutting edges, characterized in that, include: The drill bit body (100) has a drilling section (110) and a drill shank (120). The drilling section (110) is composed of multiple stepped platforms (111) with gradually increasing diameters. The drill shank (120) is located on the bottom surface of the drilling section (110) and is coaxial with the drilling section (110). The drilling section (110) has several mounting grooves (112). The cutting edge (200) is detachably disposed in the mounting groove (112). The cutting edge (200) is flat and has a first chip removal groove (210). The cutting edge (200) is used to cut the workpiece that needs to be drilled.

2. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, Also includes: A plurality of fastening screws (300) are provided, the fastening screws (300) passing through the cutting edge (200) and being detachably disposed on the drilling part (110), the fastening screws (300) being used to fix the cutting edge (200) on the drilling part (110).

3. The replaceable cutting edge pagoda drill bit according to claim 1 further includes: The drilling section (110) has a second chip removal groove (113), which is connected to the first chip removal groove (210). The first chip removal groove (210) and the second chip removal groove (113) together discharge the iron chips cut during the drilling process.

4. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, The heights of the different ladder platforms (111) are the same.

5. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, The diameter of the ladder (111) gradually increases along the direction close to the drill shank (120), and the diameters of the ladder (111) are arranged in an arithmetic sequence.

6. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, The tip of the cutting edge (200) is conical.

7. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, The drill shank (120) has multiple different clamping surfaces (121) for assisting the clamping device in fixing the drill shank (120).

8. A pagoda drill bit with replaceable cutting edges according to claim 1, characterized in that, Each of the different platforms (111) has a transition slope (114) at one end, the transition slope (114) being used to connect two adjacent different platforms (111), the inclination angle of the transition slope (114) being between 90° and 150°.

9. A pagoda drill bit with replaceable cutting edges according to claim 2, characterized in that, The fastening screws (300) are installed on the side wall of the first chip removal slot (210) and arranged in a circumferential array.

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