A variable helix solid carbide drill bit

Abstract

The utility model relates to the technical field of drill bit, especially to a variable helix integral hard alloy drill bit, including drill bit and drill handle, the drill bit and drill handle are integrally formed structure, the outer wall of drill bit is provided with the outer circle blade zone, the outer wall of drill bit is installed with the outer circle auxiliary blade zone, the outer wall of drill bit is provided with the rear blade angle, the outer wall of drill bit is provided with the top angle, the outer wall of drill bit is provided with helix angle one, the outer wall of drill bit is provided with excessive helix angle, through helix angle adjustment (high helix angle of entry section chip removal, low helix angle of exit section stable cutting), through the balance of chip removal and rigidity of groove type optimization, optimize the chip flow path, accelerate the chip removal, reduce the blockage and cutting heat, improve the hole wall quality, and the rigidity of the patent design product cutter is improved, in high -speed processing, reduce the blockage and heat accumulation, the precision and surface roughness of hole have been effectively improved, and with the cutting heat reduction, the tool life is further improved.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, specifically a variable spiral integral cemented carbide drill bit. Background Technology

[0002] The electronics industry demands high precision and miniaturization in hole machining: PCBs and other electronic components require holes with diameters less than 3mm, with positional errors ≤ ±10μm and wall roughness Ra ≤ 1.2μm. Traditional drill bits struggle to meet these requirements, while solid carbide drill bits have become mainstream due to their high rigidity and dimensional stability. Traditional flute designs suffer from low chip removal efficiency, leading to chip accumulation during high-speed machining, resulting in hole wall scratches and increased burrs.

[0003] Therefore, a variable helix solid carbide drill bit is needed to improve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a variable helix integral carbide drill bit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A variable helix integral cemented carbide drill bit includes a drill bit and a drill shank, which are integrally formed. The outer wall of the drill bit is provided with an outer circular cutting edge, an outer circular secondary cutting edge is installed on the outer wall of the drill bit, a clearance angle is provided on the outer wall of the drill bit, a apex angle is provided on the outer wall of the drill bit, a helix angle one is provided on the outer wall of the drill bit, a transition helix angle two is provided on the outer wall of the drill bit, and a flute angle one is provided on the outer wall of the drill bit.

[0007] As a preferred embodiment of this utility model, the outer wall of the drill bit is provided with a groove front angle II, the outer wall of the drill bit is provided with a tooth gap through center, and the outer wall of the drill bit is provided with a tooth gap eccentricity.

[0008] As a preferred embodiment of this utility model, the outer wall of the drill bit is provided with a tooth gap bottom R, a tooth gap entry angle, and a tooth gap expansion angle.

[0009] As a preferred embodiment of this utility model, the outer wall of the drill bit is provided with a rear cutting edge, the outer wall of the drill bit is provided with a first rear angle of the end cutting edge, and the outer wall of the drill bit is provided with a second rear angle of the end cutting edge.

[0010] As a preferred embodiment of this utility model, the outer wall of the drill bit is provided with a total cutting length, the outer wall of the drill bit is provided with a cutting edge length, and the outer wall of the drill bit is provided with a guide portion.

[0011] As a preferred embodiment of this utility model, the outer wall of the drill bit is provided with a cutting section, the outer circular cutting edge is located on one side of the outer circular secondary cutting edge, and the helix angle is located on one side of the transition helix angle.

[0012] As a preferred embodiment of this utility model, the second helix angle is located on one side of the transition helix angle, the first groove angle is located on one side of the second groove angle, and the tooth backlash is located on one side of the tooth backlash eccentricity.

[0013] As a preferred embodiment of this utility model, the tooth gap entry angle is located on one side of the tooth gap expansion angle, and the first rear angle of the end blade is located on one side of the second rear angle of the end blade.

[0014] The above technical solutions enable the adjustment of the helix angle (high helix angle for chip removal at the inlet section and low helix angle for stable cutting at the outlet section), balance chip removal and rigidity through groove optimization, optimize chip flow path, accelerate chip removal, reduce clogging and cutting heat, and improve hole wall quality.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. In this utility model, by adjusting the helix angle (high helix angle for chip removal at the inlet section and low helix angle for stable cutting at the outlet section), and by optimizing the groove shape to balance chip removal and rigidity, the chip flow path is optimized, chip removal is accelerated, clogging and cutting heat are reduced, and hole wall quality is improved. This improves the rigidity of the patented design tool, reduces clogging and heat accumulation during high-speed machining, and effectively improves the accuracy and surface roughness of the hole. At the same time, as cutting heat is reduced, tool life is further improved. This helps to solve the problem that solid carbide drills have become mainstream due to their high rigidity and dimensional stability, while traditional groove designs have low chip removal efficiency and are prone to chip accumulation during high-speed machining, leading to hole wall scratches and increased burrs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the front structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the drill bit structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the right-side structure of this utility model;

[0021] Figure 5 This utility model Figure 3 A schematic diagram of the cross-sections of the structure at points A and B.

[0022] In the diagram: 1. Drill bit; 2. Drill shank; 3. Outer circular cutting edge; 4. Outer circular secondary cutting edge; 5. Clearance angle; 6. Point angle; 7. Helix angle one; 8. Transition helix angle; 9. Helix angle two; 10. Groove rake angle one; 11. Groove rake angle two; 12. Backlash through center; 13. Backlash eccentricity; 14. Backlash bottom radius (R); 15. Backlash entry angle; 16. Backlash development angle; 17. Clearance face; 18. Clearance angle of end cutting edge one; 19. Clearance angle of end cutting edge two; 20. Total tool length; 21. Tool cutting edge length. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0025] For examples, please refer to Figure 1-5 This utility model provides a technical solution:

[0026] A variable helix integral cemented carbide drill bit includes a drill bit 1 and a drill shank 2, which are integrally formed. The outer wall of the drill bit 1 is provided with an outer circular cutting edge 3, an outer circular secondary cutting edge 4, a back cutting angle 5, a apex angle 6, a helix angle 7, a transition helix angle 8, a second helix angle 9, and a groove front angle 10.

[0027] Among them, the outer wall of drill bit 1 is provided with a groove front angle 11, the outer wall of drill bit 1 is provided with a tooth gap through center 12, the outer wall of drill bit 1 is provided with a tooth gap eccentricity 13, the outer wall of drill bit 1 is provided with a tooth gap bottom R14, and the outer wall of drill bit 1 is provided with a tooth gap infeed angle 15.

[0028] The drill bit 1 has a tooth back spread angle of 16 on its outer wall, a back cutting face of 17 on its outer wall, a first end cutting back angle of 18 on its outer wall, and a second end cutting back angle of 19 on its outer wall.

[0029] In this embodiment, the outer wall of the drill bit 1 is provided with a total tool length 20, the outer wall of the drill bit 1 is provided with a tool cutting edge length 21, the outer wall of the drill bit 1 is provided with a guide part, the outer wall of the drill bit 1 is provided with a cutting part, the outer circular cutting edge 3 is located on one side of the outer circular secondary cutting edge 4, the helix angle 1 7 is located on one side of the transition helix angle 8, and the helix angle 2 9 is located on one side of the transition helix angle 8.

[0030] In this embodiment, the first groove front angle 10 is located on one side of the second groove front angle 11, the tooth gap center 12 is located on one side of the tooth gap eccentricity 13, the tooth gap infeed angle 15 is located on one side of the tooth gap expansion angle 16, and the first end edge rear angle 18 is located on one side of the second end edge rear angle 19.

[0031] The working process of this utility model is as follows: When the variable helix integral carbide drill bit designed using this solution is working or running, through the design of variable helix angle and variable groove angle, the helix angle 1 is 30°, the transition helix angle 8 is the helix transition area from 30° to 10°, the helix angle 2 is 10°, the groove angle 1 is 15° at the groove angle 10, and the groove angle 2 is 5° at the groove angle 11.

[0032] Meanwhile, in order to improve stability during high-speed rotation, a double-edge band structure is adopted at the 30° spiral section at the front, with the outer circular edge band 3 and the outer circular secondary edge band 4 serving as the main and secondary ligaments of the tool.

[0033] The center dimension is controlled by the backlash through 12, backlash eccentricity 13, and the bottom R of the backlash bottom R14 groove. The backlash width is controlled by the back edge 17 to ensure that the overlap of the backlash center is 0.01 to 0.05, thereby improving the centering ability of the tool.

[0034] The apex angle 6 is designed to be 135°, the first end-edge clearance angle 18 is designed to be 10°, and the second end-edge clearance angle 19 is designed to be 30°. In order to improve the strength of the blade tip, the clearance angle 5 adopts a chamfer design of 0.1-0.2.

[0035] By adjusting the helix angle (high helix angle at the inlet for chip removal, and low helix angle at the outlet for stable cutting), and by optimizing the groove shape to balance chip removal and rigidity, the chip flow path is optimized, chip removal is accelerated, clogging and cutting heat are reduced, and hole wall quality is improved. This, in turn, enhances the rigidity of the patented design tool. In high-speed machining, clogging and heat accumulation are reduced, and the accuracy and surface roughness of the hole are effectively improved. At the same time, with the reduction of cutting heat, tool life is further increased. This helps to solve the problem that solid carbide drills have become mainstream due to their high rigidity and dimensional stability, while traditional groove designs have low chip removal efficiency and are prone to chip accumulation during high-speed machining, leading to hole wall scratches and increased burrs.

[0036] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A variable helix solid carbide drill bit comprising a drill bit (1) and a shank (2), characterized in that: The drill bit (1) and the drill shank (2) are integrally formed. The outer wall of the drill bit (1) is provided with an outer circular cutting edge (3). The outer wall of the drill bit (1) is provided with an outer circular secondary cutting edge (4). The outer wall of the drill bit (1) is provided with a back cutting edge angle (5). The outer wall of the drill bit (1) is provided with a apex angle (6). The outer wall of the drill bit (1) is provided with a helix angle one (7). The outer wall of the drill bit (1) is provided with a transition helix angle (8). The outer wall of the drill bit (1) is provided with a helix angle two (9). The outer wall of the drill bit (1) is provided with a groove front angle one (10).

2. A variable helix solid carbide drill bit according to claim 1, characterized in that: The drill bit (1) has a groove front angle 2 (11) on its outer wall, a tooth gap through center (12) on its outer wall, and a tooth gap eccentricity (13) on its outer wall.

3. A variable helix solid carbide drill according to claim 2, wherein: The drill bit (1) has a tooth gap bottom R (14) on its outer wall, a tooth gap infeed angle (15) on its outer wall, and a tooth gap spread angle (16) on its outer wall.

4. A variable helix solid carbide drill according to claim 3, wherein: The drill bit (1) has a rear cutting edge (17) on its outer wall, an end cutting edge with a first rear angle (18) on its outer wall, and an end cutting edge with a second rear angle (19) on its outer wall.

5. A variable helix solid carbide drill according to claim 4, wherein: The outer wall of the drill bit (1) is provided with a total cutting tool length (20), the outer wall of the drill bit (1) is provided with a cutting tool edge length (21), and the outer wall of the drill bit (1) is provided with a guide portion.

6. A variable helix solid carbide drill bit according to claim 5 wherein: The drill bit (1) has a cutting section on its outer wall, the outer circular cutting edge (3) is located on one side of the outer circular secondary cutting edge (4), and the helix angle (7) is located on one side of the transition helix angle (8).

7. A variable helix solid carbide drill bit according to claim 6, wherein: The second helix angle (9) is located on one side of the transition helix angle (8), the first groove angle (10) is located on one side of the second groove angle (11), and the tooth backlash center (12) is located on one side of the tooth backlash eccentricity (13).

8. A variable helix solid carbide drill bit according to claim 7, wherein: The tooth gap infeed angle (15) is located on one side of the tooth gap expansion angle (16), and the first back angle (18) of the end edge is located on one side of the second back angle (19) of the end edge.

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