Crown drill bit

Abstract

The utility model relates to a kind of crown drill blades, including blade main body and handle and tool bit, the tool bit includes first blade part and the second blade part, the first blade part and the second blade part are equipped with main tool bit and auxiliary tool bit, the inclination angle of the main tool bit is greater than the inclination angle of the auxiliary tool bit, the first blade part and the second blade part between being equipped with chip removal groove, the lower middle part of the blade main body is equipped with the mounting hole that it is through the thickness direction, the both sides of the blade main body are integrally formed and equipped with cutting part, the cutting part includes arc cutting edge and straight cutting edge, one end of the arc cutting edge is smoothly connected with one end of the straight cutting edge, step surface is formed between the arc cutting edge and the straight cutting edge, the other end of the arc cutting edge and the side edge of the blade main body smoothly transition.

Description

Technical Field

[0001] This utility model relates to the technical field of cutting tools, specifically to a crown drill bit. Background Technology

[0002] In the field of machining, drilling is a common process. Crown drill inserts, as the core cutting component of drilling tools, play a decisive role in drilling accuracy, efficiency, and tool life. Existing crown drill inserts suffer from problems such as unreasonable cutting edge design, high cutting resistance, and poor chip removal; insufficient stability of the mounting and connection structure, making them prone to loosening during drilling; and poor wear resistance of the insert material, resulting in a short service life. These issues make it difficult to meet the demands of high-precision and high-efficiency drilling. Therefore, it is necessary to design a new crown drill insert to solve these problems. Utility Model Content

[0003] The purpose of this utility model is to address the technical problems existing in the prior art by providing a detachable pillow. The specific technical solution is as follows: This utility model provides a crown drill bit, including a bit body, a tool holder, and a cutting head. The cutting head includes a first cutting edge and a second cutting edge, each with a main cutting head and an auxiliary cutting head. The inclination angle of the main cutting head is greater than that of the auxiliary cutting head. A chip removal groove is provided between the first and second cutting edges. A mounting hole penetrating the thickness direction is provided in the lower center of the bit body for mounting the bit body on a corresponding tool holder or tool holder. Both sides of the bit body are integrally formed with cutting portions. The cutting section includes an arc-shaped cutting edge and a straight cutting edge. This combination of cutting edges allows the arc-shaped cutting edge to better penetrate the workpiece in the initial stage of drilling, reducing cutting resistance, while the straight cutting edge can stably cut during the drilling process. The combination of the two makes cutting smoother and chip removal more efficient. One end of the arc-shaped cutting edge is smoothly connected to one end of the straight cutting edge, and a stepped surface is formed between the arc-shaped cutting edge and the straight cutting edge. The other end of the arc-shaped cutting edge smoothly transitions to the side of the insert body, and the other end of the straight cutting edge is connected to the auxiliary chip removal groove on the side of the insert body.

[0004] A further improvement of this utility model is that the included angle of the chip removal groove is 80±5°, which facilitates the discharge of cutting chips, increases the discharge efficiency, reduces the temperature of the cutter head, and thus improves the overall service life and efficiency.

[0005] A further improvement of this utility model is that: the inner wall of the mounting hole is uniformly provided with anti-slip texture in the circumferential direction. The anti-slip texture is a fine tooth-like structure extending in the circumferential direction along the inner wall of the mounting hole, which increases the friction between the mounting hole and the mounting component, prevents the blade body from sliding relative to the mounting component during use, and improves the stability of the installation.

[0006] A further improvement of this utility model is that the blade body is block-shaped.

[0007] A further improvement of this utility model is that the included angle between the top of the first blade portion and the second blade portion is 140°±3°, and setting this angle can meet the customer's cutting parameter requirements.

[0008] A further improvement of this utility model is that the top end face of the straight cutting edge has a 35°±5° inclined structure, which maximizes the assistance of the cutting head in successfully completing the cutting operation.

[0009] A further improvement of this utility model is that the blade body is made of cemented carbide material.

[0010] Beneficial effects:

[0011] In this invention, the arc-shaped cutting edge and the straight cutting edge of the cutting part are smoothly connected. The arc-shaped cutting edge helps the tool head to easily cut into the workpiece, while the straight cutting edge ensures stable cutting, low cutting resistance, and smooth chip removal, significantly improving drilling efficiency and accuracy. The main body of the insert is made of cemented carbide material, which has high hardness and wear resistance, greatly extending the service life of the insert. The overall structure design is scientific and reasonable, highly practical, and can well meet the requirements of high-precision and high-efficiency drilling in machining. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a side view of the structure of this utility model; Figure 4 This is a schematic diagram of the top view of the structure of this utility model; Figure descriptions: 1-Insert body, 2-Handle, 3-Insert tip, 4-First insert section, 5-Second insert section, 6-Main insert tip, 7-Auxiliary insert tip, 8-Chip removal groove, 9-Mounting hole, 10-Cutting section, 11-Arc-shaped cutting edge, 12-Arc-shaped cutting edge, 13-Step surface, 14-Auxiliary chip removal groove, 15-Anti-slip texture, 16-Beveled structure. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0014] This embodiment provides a crown drill bit, including a bit body 1, a tool holder 2, and a drill head 3. The drill head 3 includes a first cutting edge 4 and a second cutting edge 5. Both the first cutting edge 4 and the second cutting edge 5 are provided with a main cutting head 6 and an auxiliary cutting head 7. The inclination angle of the main cutting head 6 is greater than the inclination angle of the auxiliary cutting head 7. A chip removal groove 8 is provided between the first cutting edge 4 and the second cutting edge 5. A mounting hole 9 penetrating the thickness direction is opened in the lower center of the bit body 1 for mounting the bit body 1 on a corresponding tool holder or tool holder. Both sides of the bit body 1 are integrally formed with cutting portions 10. The cutting portions 10 cover... The cutting edge combination includes an arc-shaped cutting edge 11 and a straight cutting edge 12. The arc-shaped cutting edge 11 can better cut into the workpiece in the initial stage of drilling and reduce cutting resistance, while the straight cutting edge 12 can stably cut during drilling. The combination of the two makes cutting smoother and chip removal more efficient. One end of the arc-shaped cutting edge 11 is smoothly connected to one end of the straight cutting edge 12, and a stepped surface 13 is formed between the arc-shaped cutting edge 11 and the straight cutting edge 12. The other end of the arc-shaped cutting edge 11 smoothly transitions to the side of the insert body 1, and the other end of the straight cutting edge 12 is connected to the auxiliary chip removal groove 14 on the side of the insert body 1.

[0015] The chip removal groove 8 has an included angle of 80±5°, which facilitates the discharge of cutting chips, increases the discharge efficiency, reduces the temperature of the cutting head, and thus improves the overall service life and efficiency. The inner wall of the mounting hole 9 is uniformly provided with anti-slip textures 15. The anti-slip textures 15 are fine tooth-like structures extending circumferentially along the inner wall of the mounting hole, which increases the friction between the mounting hole 9 and the mounting component, prevents the blade body 1 from sliding relative to the mounting component during use, and improves the stability of the installation. The blade body 1 is block-shaped. The included angle between the top of the first blade part 4 and the second blade part 5 is 140°±3°. This angle can meet the customer's cutting parameter requirements. The top end face of the straight cutting edge 12 has a 35°±5° inclined structure 16, which assists the cutting head 7 to complete the cutting operation to the greatest extent. The blade body 1 is made of cemented carbide material.

[0016] The above are merely preferred embodiments of this utility model, but do not limit the patent scope of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model's specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A crown drill bit, characterized in that: The tool includes a blade body, a handle, and a cutting head. The cutting head includes a first blade portion and a second blade portion. Both the first and second blade portions are provided with a main cutting head and an auxiliary cutting head. The inclination angle of the main cutting head is greater than that of the auxiliary cutting head. A chip removal groove is provided between the first and second blade portions. A mounting hole penetrating the thickness direction is opened in the lower center of the blade body. Both sides of the blade body are integrally formed with cutting portions. The cutting portions include an arc-shaped cutting edge and a straight cutting edge. One end of the arc-shaped cutting edge is smoothly connected to one end of the straight cutting edge. A stepped surface is formed between the arc-shaped cutting edge and the straight cutting edge. The other end of the arc-shaped cutting edge smoothly transitions to the side of the blade body. The other end of the straight cutting edge is connected to the auxiliary chip removal groove on the side of the blade body.

2. A crown drill bit according to claim 1, characterized in that: The included angle of the dandruff removal groove is 80±5°.

3. A crown drill bit according to claim 1, characterized in that: The inner wall of the mounting hole is uniformly provided with anti-slip texture, which is a fine tooth-like structure extending along the inner wall of the mounting hole.

4. A crown drill bit according to claim 1, characterized in that: The blade body is block-shaped.

5. A crown drill bit according to claim 1, characterized in that: The included angle between the top of the first blade portion and the top of the second blade portion is 140°±3°.

6. A crown drill bit according to claim 1, characterized in that: The top end face of the straight cutting edge has a 35°±5° bevel structure.

7. A crown drill bit according to claim 1, characterized in that: The blade body is made of cemented carbide.

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