A high-strength composite structure drill bit

Abstract

This utility model discloses a high-strength composite structure drill bit, relating to the field of drill bit technology, comprising: a reinforcing rod; a cutting assembly disposed on the outer circumference of the reinforcing rod; a fixing assembly disposed on the outer circumference of the reinforcing rod and the cutting assembly for fixing the reinforcing rod and the cutting assembly; and a composite layer disposed on the surface of the cutting assembly for high-strength protection. This utility model, by setting auxiliary spiral grooves and gradually decreasing the spiral angle from the bottom to the top of the drill bit, optimizes the guidance and discharge path of waste chips according to the needs of different stages during drilling. This not only improves chip removal efficiency and reduces pressure backflow caused by waste chip blockage, but also enhances drilling speed and the stability of the drilling process.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and more specifically, to a high-strength composite structure drill bit. Background Technology

[0002] With the rapid development of the manufacturing industry, drilling has been widely applied in various industrial fields such as aerospace, chemical industry, automobile manufacturing, and precision instruments. Especially with the increasing use of high-hardness, high-strength materials (such as titanium alloys, high-temperature alloys, engineering ceramics, and composite materials), higher demands are being placed on the performance of drill tools. To meet the requirements of precision machining, efficient cutting, and long service life, the technical performance of drill tools in terms of strength, wear resistance, impact resistance, high-temperature resistance, and cutting efficiency is constantly being challenged.

[0003] Currently, traditional drill bits are mainly made of carbon steel or ordinary alloy steel. Although these materials possess certain strength, rigidity, and corrosion resistance, meeting general machining requirements, their performance bottlenecks gradually become apparent when faced with complex working conditions and high-intensity continuous operations. For example, under high-speed cutting or extreme temperatures (such as the high-temperature environment during high-temperature alloy machining), traditional drill bits are prone to premature failure due to thermal wear, fatigue fracture, or surface spalling. Especially under high-intensity continuous operation conditions, the strength and wear resistance of the drill bit material cannot effectively support long-term, high-efficiency cutting, leading to severe wear on the drill bit surface, which in turn reduces machining efficiency and increases overall production costs. Furthermore, traditional drill bits lack adaptability to different material properties, making it difficult to effectively match the differentiated needs of different drilling stages (such as guiding, reaming, and stabilizing drilling), thus affecting the stability and reliability of the drilling process.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a high-strength composite structure drill bit to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A high-strength composite structure drill bit includes: a reinforcing rod; a cutting assembly disposed on the outer circumference of the reinforcing rod; a fixing assembly disposed on the outer circumference of the reinforcing rod and the cutting assembly for fixing the reinforcing rod and the cutting assembly; and a composite layer disposed on the surface of the cutting assembly for high-strength protection.

[0008] Furthermore, in order to improve the structural stability of the drill bit, reduce torque fluctuations, and enhance the overall safety of the machining operation, several limiting rods are provided at the bottom of the outer circumference of the reinforcing rod.

[0009] Furthermore, in order to optimize the guidance and discharge path of waste chips according to the needs of different stages in the drilling process and improve the chip removal efficiency, the cutting assembly includes a cutting housing set on the outer side of the reinforcing rod, and the inner wall of the cutting housing is provided with a limiting groove that cooperates with the limiting rod; a spiral groove is provided at the bottom of the outer side of the cutting housing, a cutting face is provided at the bottom end of the cutting housing, and an auxiliary spiral groove is provided on the outer side of the inner wall of the spiral groove, and the spiral angle of the spiral groove decreases from bottom to top.

[0010] Furthermore, in order to improve drilling efficiency and adaptability and extend the overall service life, the fixing component includes a fixing plate disposed on the outer side of the reinforcing rod, and the fixing plate is located at the top of the limiting rod. Several first fixing blocks are disposed on the outer side of the circumference of the fixing plate, and the top of the first fixing block is provided with a first fixing hole. The fixing component also includes several second fixing blocks disposed on the outer side of the circumference of the cutting housing, and the top of the second fixing block is provided with a second fixing hole, and the second fixing hole is fixed to the first fixing hole by bolts.

[0011] Furthermore, in order to improve the surface hardness of the drill bit, reduce the wear rate, and enhance the high strength and high hardness performance of the drill bit, the composite layer includes a hard base layer disposed on the surface of the cutting component, a transition layer disposed on the outside of the hard base layer, and a surface strengthening layer disposed on the outside of the transition layer.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. By setting an auxiliary spiral groove and gradually reducing the spiral angle of the spiral groove from the bottom to the top of the drill bit, this utility model can optimize the guidance and discharge path of waste chips according to the needs of different stages in the drilling process. This not only improves the chip removal efficiency and reduces the pressure backflow caused by waste chip blockage, but also improves the drilling speed and the stability of the drilling process.

[0014] 2. By setting a composite layer, this utility model can not only improve the surface hardness of the drill bit and reduce the wear rate, but also enhance the adhesion between the layers, reduce the stress concentration at the interface, and improve the high strength and high hardness performance of the drill bit. At the same time, the composite layer can improve heat resistance and impact resistance, and extend the service life of the drill bit under complex working conditions.

[0015] 3. By setting a fixing component, this utility model not only facilitates the quick replacement of worn cutting shells and extends the overall service life, but also allows for flexible replacement of the cutting shells according to different working conditions, improving drilling efficiency and adaptability. At the same time, the reinforcing rod provides stable support, ensuring rigidity and accuracy during the drilling process, thereby enhancing the reliability and economy of the drill bit under complex working conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a high-strength composite structure drill bit according to an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of a high-strength composite structure drill bit according to an embodiment of the present utility model;

[0019] Figure 3 This is one of the partial structural schematic diagrams of a high-strength composite structure drill bit according to an embodiment of the present utility model;

[0020] Figure 4 This is a second partial structural schematic diagram of a high-strength composite structure drill bit according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the composite layer in a high-strength composite structure drill bit according to an embodiment of the present invention.

[0022] In the picture:

[0023] 1. Reinforcing rod; 2. Cutting assembly; 201. Cutting housing; 202. Limiting groove; 203. Spiral groove; 2031. Auxiliary spiral groove; 204. Cutting face; 3. Fixing assembly; 301. Fixing disc; 302. First fixing block; 303. First fixing hole; 304. Second fixing block; 305. Second fixing hole; 306. Bolt; 4. Composite layer; 401. Hard base layer; 402. Transition layer; 403. Surface strengthening layer; 5. Limiting rod. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0025] According to an embodiment of the present invention, a high-strength composite structure drill bit is provided.

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-5 As shown, the high-strength composite structure drill bit according to an embodiment of the present invention includes: a reinforcing rod 1; a cutting assembly 2 disposed on the outer circumference of the reinforcing rod 1; a fixing assembly 3 disposed on the outer circumference of the reinforcing rod 1 and the cutting assembly 2, for fixing the reinforcing rod 1 and the cutting assembly 2; and a composite layer 4 disposed on the surface of the cutting assembly 2 for achieving high-strength protection.

[0027] By utilizing the above-mentioned technical solution of this utility model, and by setting an auxiliary spiral groove 2031 with the spiral angle of the spiral groove 203 gradually decreasing from the bottom to the top of the drill bit, the guiding and discharge path of the cuttings can be optimized according to the needs of different stages during drilling. This not only improves the cuttings removal efficiency and reduces pressure backflow caused by cuttings blockage, but also enhances the drilling speed and the stability of the drilling process. By setting a composite layer 4, not only can the surface hardness of the drill bit be improved and the wear rate reduced, but the adhesion between the layers can also be enhanced, reducing interface stress concentration and improving the high strength and high hardness performance of the drill bit. At the same time, the composite layer 4 can improve heat resistance and impact resistance, extending the service life of the drill bit under complex working conditions. By setting a fixing component 3, it is not only convenient to quickly replace the worn cutting shell 201 and extend the overall service life, but also to flexibly replace the cutting shell 201 according to different working conditions, improving drilling efficiency and adaptability. At the same time, the reinforcing rod 1 provides stable support, ensuring rigidity and accuracy during drilling, thereby enhancing the reliability and economy of the drill bit under complex working conditions.

[0028] In one embodiment, for the reinforcing rod 1, a plurality of limiting rods 5 are provided at the bottom of the outer circumference of the reinforcing rod 1, thereby improving the structural stability of the drill bit, reducing torque fluctuations, and enhancing the overall safety of the machining operation.

[0029] In one embodiment, the cutting assembly 2 includes a cutting housing 201 disposed on the outer side of the reinforcing rod 1, and the inner wall of the cutting housing 201 is provided with a limiting groove 202 that cooperates with the limiting rod 5; a spiral groove 203 is provided at the bottom of the outer side of the cutting housing 201, a cutting face 204 is provided at the bottom end of the cutting housing 201, and an auxiliary spiral groove 2031 is provided on the outer side of the inner wall of the spiral groove 203. The spiral angle of the spiral groove 203 decreases from bottom to top, thereby optimizing the guidance and discharge path of the waste chips according to the needs of different stages in the drilling process and improving the chip removal efficiency.

[0030] It should be further noted that the bottom of the cutting housing 201 has a larger helix angle, which helps to increase the chip removal space, quickly remove large-volume chips generated during the initial drilling process, reduce initial drilling resistance, improve the guiding stability of the drill bit, reduce friction with the hole wall, and extend the service life of the drill bit. The top has a smaller helix angle, which reduces the helical groove lift, improves the rigidity and structural stability of the drill bit, prevents deviation during the hole exit stage, optimizes the chip removal path, reduces the risk of chip blockage and pressure backflow, and improves drilling accuracy and surface quality. Through the design of the helix angle gradually decreasing from bottom to top, the chip removal path can be effectively controlled for different stages of the drilling process, not only improving chip removal efficiency and reducing blockage, but also increasing drilling speed and the stability of the machining process.

[0031] In one embodiment, the fixing component 3 includes a fixing plate 301 disposed on the outer circumference of the reinforcing rod 1, and the fixing plate 301 is located at the top of the limiting rod 5. A plurality of first fixing blocks 302 are disposed on the outer circumference of the fixing plate 301, and the top of the first fixing blocks 302 is provided with a first fixing hole 303. The fixing component 3 also includes a plurality of second fixing blocks 304 disposed on the outer circumference of the cutting housing 201, and the top of the second fixing blocks 304 is provided with a second fixing hole 305. The second fixing hole 305 is fixed to the first fixing hole 303 by bolts 306, thereby improving drilling efficiency and adaptability and extending the overall service life.

[0032] In one embodiment, the composite layer 4 includes a hard base layer 401 disposed on the surface of the cutting assembly 2, a transition layer 402 disposed on the outer side of the hard base layer 401, and a surface strengthening layer 403 disposed on the outer side of the transition layer 402, thereby improving the surface hardness of the drill bit, reducing the wear rate, and enhancing the high strength and high hardness performance of the drill bit.

[0033] It should be further noted that the hard base layer 401 is made of cemented carbide (such as WC-Co, PCBN, PCD) or ceramic matrix composites (such as Al2O3 / SiC composites). It is used to bear cutting loads and provide the main structural strength, possessing excellent thermal stability and impact resistance. It forms the "skeleton" of the high-strength drill bit, ensuring structural stability even during high-speed drilling and hard rock environments. The transition layer 402 can be a nitrided layer (such as titanium nitride), a carbonitrided layer, a boronized layer, or a metallic transition layer (such as Cr, Ni). It is used to improve the bonding strength between the surface coating and the base layer, effectively mitigating thermal and mechanical stress gradients as a buffer layer, achieving a gradient transition between structures. It also possesses certain wear resistance and heat resistance, acting as a "bridge." The surface strengthening layer 403 includes TiN, TiAlN, CrN, DLC (diamond-like carbon) or nano-ceramic coatings, with a thickness typically ranging from a few micrometers to tens of micrometers. It is mainly used to provide high hardness and excellent wear resistance, while enhancing the corrosion resistance and oxidation resistance of the drill bit surface, reducing the coefficient of friction, and thus significantly improving cutting performance.

[0034] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0035] In practical applications, after connecting the reinforcing rod 1 to the drilling machine, the drilling machine is started to drive the cutting assembly 2 to rotate at high speed, and the cutting face 204 performs efficient drilling operations on the workpiece. During the drilling process, the spiral groove 203 and the auxiliary spiral groove 2031 can effectively accommodate the generated chips, improve chip removal performance, thereby reducing wear and extending the service life of the drill bit. When the cutting housing 201 needs to be replaced according to actual use requirements, the bolts 306 can be removed from the first fixing hole 303 and the second fixing hole 305 to achieve quick separation of the reinforcing rod 1 and the cutting assembly 2, which facilitates the replacement of the cutting housing. The structure is simple, the operation is convenient, and the disassembly and assembly efficiency and maintenance convenience of the drill bit are improved.

[0036] In summary, by utilizing the above-mentioned technical solution of this utility model, and by setting the auxiliary spiral groove 2031 and gradually decreasing the spiral angle of the spiral groove 203 from the bottom to the top of the drill bit, the guiding and discharge path of the cuttings can be optimized according to the needs of different stages in the drilling process. This not only improves the cuttings removal efficiency and reduces pressure backflow caused by cuttings blockage, but also enhances the drilling speed and the stability of the drilling process. By setting the composite layer 4, not only can the surface hardness of the drill bit be improved and the wear rate reduced, but the adhesion between the layers can also be enhanced, reducing interface stress concentration and improving the high strength and high hardness performance of the drill bit. At the same time, the composite layer 4 can improve heat resistance and impact resistance, extending the service life of the drill bit under complex working conditions. By setting the fixing component 3, it is not only convenient to quickly replace the worn cutting shell 201 and extend the overall service life, but also to flexibly replace the cutting shell 201 according to different working conditions, improving drilling efficiency and adaptability. At the same time, the reinforcing rod 1 provides stable support, ensuring rigidity and accuracy during the drilling process, thereby enhancing the reliability and economy of the drill bit under complex working conditions.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-strength composite structure drill bit, characterized in that, include: Reinforcing bar (1); The cutting assembly (2) is disposed on the outer circumference of the reinforcing rod (1); A fixing component (3) is disposed on the outer circumference of the reinforcing rod (1) and the cutting component (2) to achieve a fixed connection between the reinforcing rod (1) and the cutting component (2); A composite layer (4) is disposed on the surface of the cutting assembly (2) to achieve high-strength protection.

2. The high-strength composite structure drill bit according to claim 1, characterized in that, The reinforcing rod (1) has several limiting rods (5) on its outer bottom circumference.

3. A high-strength composite structure drill bit according to claim 2, characterized in that, The cutting assembly (2) includes a cutting housing (201) disposed on the outer side of the reinforcing rod (1), and the inner wall of the cutting housing (201) is provided with a limiting groove (202) that cooperates with the limiting rod (5). The cutting housing (201) has a spiral groove (203) on the bottom of its outer circumference, and a cutting edge (204) is provided at the bottom end of the cutting housing (201).

4. A high-strength composite structure drill bit according to claim 3, characterized in that, An auxiliary spiral groove (2031) is provided on the outer side of the inner wall of the spiral groove (203).

5. A high-strength composite structure drill bit according to claim 4, characterized in that, The helical angle of the spiral groove (203) decreases from bottom to top.

6. A high-strength composite structure drill bit according to claim 5, characterized in that, The fixing component (3) includes a fixing plate (301) disposed on the outer side of the reinforcing rod (1), and the fixing plate (301) is located at the top of the limiting rod (5). A plurality of first fixing blocks (302) are disposed on the outer side of the circumference of the fixing plate (301), and a first fixing hole (303) is opened at the top of the first fixing block (302).

7. A high-strength composite structure drill bit according to claim 6, characterized in that, The fixing component (3) further includes a plurality of second fixing blocks (304) disposed on the outer side of the circumference of the cutting housing (201). The top end of the second fixing block (304) is provided with a second fixing hole (305), and the second fixing hole (305) is fixed to the first fixing hole (303) by bolts (306).

8. A high-strength composite structure drill bit according to claim 1, characterized in that, The composite layer (4) includes a hard base layer (401) disposed on the surface of the cutting assembly (2), a transition layer (402) disposed on the outside of the hard base layer (401), and a surface strengthening layer (403) disposed on the outside of the transition layer (402).

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