A multi-layer composite coating twist drill

Abstract

The utility model relates to the field of twist drill, and disclose a kind of multilayer composite coating twist drill, including drill bit end and the connecting end being connected with drill bit end, at least two groups of spiral grooves are set in the one end of drill bit end, spiral groove is used to discharge the debris generated when drilling, the inner side edge end position of spiral groove is integrally formed with reinforcing blade, the outside of drill bit end is provided with composite coating, reduce use cost, improve economy: twist drill adopts detachable design, drill bit end and connecting end are detachably connected by plug-in part, bolt assembly and other structures.When drill bit end wears or is damaged, only drill bit end needs to be replaced, and the connecting end can continue to be used, greatly reducing material waste and reducing overall use cost. Compared with the situation that the traditional integrally formed twist drill needs to be scrapped as a whole, the economy and resource utilization of the product are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of twist drills, specifically a multi-layer composite coated twist drill. Background Technology

[0002] In the field of machining, twist drills are a commonly used drilling tool, widely used in drilling operations on metals and non-metals. Traditional twist drills are typically formed by a single piece of the drill bit and connecting end. The spiral grooves at the drill bit end are used for chip removal, and their structural strength and coating performance directly affect drilling efficiency and service life. However, the existing technology has the following problems:

[0003] I. Limitations of Structural Connection Methods

[0004] Traditional twist drills typically have a fixed connection between the drill bit and the connecting end. When the drill bit needs to be replaced due to wear or damage, the entire drill bit often needs to be scrapped, leading to material waste and increased operating costs. Some detachable structures use simple plug-in or threaded connections, which suffer from insufficient connection stability. During drilling, vibration can easily cause components to loosen, affecting drilling accuracy and even causing safety accidents.

[0005] II. The contradiction between chip removal and structural strength

[0006] As the core structure for chip removal, the spiral groove bears a large cutting force on its inner edge during high-speed rotating drilling. In existing designs, this part is not strong enough and is prone to wear or chipping. Simply thickening the material will reduce the volume of the spiral groove, affecting chip removal efficiency and forming a performance bottleneck of "strength-chip removal". To address this, we propose a multi-layer composite coated twist drill. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a multi-layer composite coated twist drill, which solves the aforementioned problems.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a multi-layer composite coated twist drill, including a drill bit end and a connecting end connected to the drill bit end, wherein at least two sets of spiral grooves are provided at one end of the drill bit end, the spiral grooves are used to discharge the debris generated during drilling, the inner side edge of the spiral grooves is integrally formed with a reinforcing blade, and the outer side of the drill bit end is provided with a composite coating.

[0009] Preferably, the drill bit end has two side grooves, and the connecting end has an integrally formed insertion part at the position corresponding to the side groove. The insertion part is engaged with the corresponding side groove, and the side of the insertion part away from the center point is arc-shaped.

[0010] Preferably, one of the plug parts is provided with a pin assembly, and a snap-fit ​​groove is formed on the inner wall of the side groove on one side, and the pin assembly is snapped together with the snap-fit ​​groove.

[0011] Preferably, the pin assembly includes an outer protrusion and a plug block. A circular hole is provided on the plug part. An outer protrusion is integrally formed on the outer wall of the plug part at the position corresponding to the circular hole. An annular protrusion is inserted into the inner side of the outer protrusion. The annular protrusion is T-shaped, and one end of the annular protrusion is inserted into the inner side of the snap-fit ​​groove.

[0012] Preferably, the inner wall of the circular hole and the outer protrusion is provided with an inner annular groove to maintain communication. A compression spring is fixedly installed on the side of the snap-fit ​​groove away from the center point. An annular protrusion is integrally formed on the outer side of the plug block. The annular protrusion is movably snapped together with the inner annular groove. One end of the annular protrusion is fixedly connected to the end of the compression spring.

[0013] Compared with the prior art, this utility model provides a multi-layer composite coated twist drill, which has the following beneficial effects:

[0014] Reduced operating costs and improved economy: The twist drill features a detachable design, with the drill bit and connecting end detachably connected via a connector and pin assembly. When the drill bit wears out or is damaged, only the drill bit needs to be replaced, while the connecting end remains usable, significantly reducing material waste and lowering overall operating costs. Compared to traditional one-piece twist drills that require complete scrapping, this significantly improves the product's economy and resource utilization.

[0015] Enhanced connection stability and guaranteed machining accuracy: The unique pin assembly design, including outer protrusions, insertion blocks, annular protrusions, and compression springs, ensures a very secure connection between the drill bit end and the connection end. Even during drilling, vibrations can effectively prevent components from loosening, thus guaranteeing drilling accuracy, reducing workpiece scrap rates due to accuracy deviations, and lowering the probability of safety accidents.

[0016] Optimized chip removal and structural strength: The integrated reinforcing edge on the inner side of the spiral groove enhances the structural strength of this part without reducing the volume of the spiral groove. It can effectively withstand the cutting force during high-speed rotating drilling, reducing wear and chipping, while ensuring the chip removal efficiency of the spiral groove. This solves the performance contradiction of "strength-chip removal" in traditional twist drills, improving the overall performance and service life of twist drills.

[0017] Enhanced Coating Protection: The composite coating on the outer side of the drill bit offers superior wear resistance and high-temperature resistance compared to traditional single-layer coatings. In complex cutting environments such as drilling high-hardness materials or prolonged continuous operation, the composite coating provides longer-lasting protection, reducing coating peeling or failure, thereby improving the durability of the twist drill and ensuring consistent drilling quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 for Figure 3 BB cross-sectional diagram in the middle;

[0022] Figure 5 for Figure 4 A magnified view of part C in the diagram.

[0023] In the diagram: 1. Drill bit end; 2. Connecting end; 3. Spiral groove; 4. Reinforcing edge; 5. Side groove; 6. Insertion part; 7. Outer protrusion; 8. Inner annular groove; 9. Snap-fit ​​groove; 10. Insertion block; 11. Annular protrusion; 12. Compression spring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 A multi-layer composite coated twist drill includes a drill bit end 1 and a connecting end 2 connected to the drill bit end 1. At least two sets of spiral grooves 3 are provided at one end of the drill bit end 1. The spiral grooves 3 are used to discharge the debris generated during drilling. A reinforcing blade 4 is integrally formed on the inner side edge of the spiral grooves 3. A composite coating is provided on the outer side of the drill bit end 1.

[0026] Furthermore, two side grooves 5 are provided at the end of the drill bit end 1. A plug-in part 6 is integrally formed at the position of the side groove 5 corresponding to the position of the connecting end 2. The plug-in part 6 is engaged with the corresponding side groove 5. The side of the plug-in part 6 away from the center point is arc-shaped. When the plug-in part 6 is engaged with the side groove 5, the end of the drill bit end 1 and the two plug-in parts 6 will form a complete cylinder.

[0027] Furthermore, one of the plug-in parts 6 is provided with a pin assembly, and a snap-fit ​​groove 9 is provided on the inner wall of the side groove 5 on one side, and the pin assembly is snapped together with the snap-fit ​​groove 9.

[0028] Furthermore, the pin assembly includes an outer protrusion 7 and a plug block 10. A circular hole is provided on the plug part 6. An outer protrusion 7 is integrally formed on the outer wall of the plug part 6 at the position corresponding to the circular hole. An annular protrusion 11 is inserted into the inner side of the outer protrusion 7. The annular protrusion 11 is T-shaped, and one end of the annular protrusion 11 is inserted into the inner side of the snap-fit ​​groove 9.

[0029] Furthermore, an inner annular groove 8 for maintaining communication is provided on the inner wall of the circular hole and the outer protrusion 7. A compression spring 12 is fixedly installed on the inside of the snap-fit ​​groove 9 on the side away from the center point. An annular protrusion 11 is integrally formed on the outer side of the plug block 10. The annular protrusion 11 is movably snapped together with the inner annular groove 8. One end of the annular protrusion 11 is fixedly connected to the end of the compression spring 12. When it is necessary to connect the drill end 1 and the connecting end 2, the plug block 10 is pulled to the side away from the center point. Then the compression spring 12 retracts. Then the plug block 10 retracts into the inside of the circular hole. Then the plug part 6 is inserted into the inside of the side groove 5. Then the plug block 10 is released. At this time, the compression spring 12 rebounds and drives the annular protrusion 11 to move closer to the snap-fit ​​groove 9. Then one end of the plug block 10 is snapped into the inside of the snap-fit ​​groove 9, completing the connection between the drill end 1 and the connecting end 2.

[0030] Working principle: When it is necessary to connect drill bit end 1 and connecting end 2, pull the plug block 10 to the side away from the center point, then compress the spring 12 to retract, and then the plug block 10 retracts into the inside of the circular hole. Then insert the plug part 6 into the inside of the side groove 5, and then release the plug block 10. At this time, the spring 12 rebounds, driving the annular protrusion 11 to move closer to the snap-fit ​​groove 9. Then one end of the plug block 10 snaps into the inside of the snap-fit ​​groove 9, completing the connection between drill bit end 1 and connecting end 2.

[0031] Structural Description:

[0032] Drill end 1: One end of the multi-layer composite coated twist drill, connected to the connecting end 2, is the main part of the twist drill for drilling operations. It has a composite coating on its outer side, two side grooves 5 at the end, and at least two sets of spiral grooves 3 at one end.

[0033] Connecting end 2: The part that connects to the drill bit end 1. A plug-in part 6 is integrally formed on the side groove 5 of the drill bit end 2 for connecting and combining with the drill bit end 1. It is another important component of the twist drill.

[0034] Spiral groove 3: Located at one end of the drill bit 1, at least two sets are provided. Its main function is to discharge the debris generated during drilling and ensure the smooth progress of drilling operations. The inner side end is integrally formed with a reinforcing blade 4.

[0035] Reinforcing blade 4: integrally formed on the inner edge of the spiral groove 3, it enhances the structural strength of the twist drill and helps to improve the service life and drilling quality of the twist drill.

[0036] Side groove 5: There are two grooves at the end of the drill bit 1. They are used to engage with the insertion part 6 of the connecting end 2. They are an important structural part for connecting the drill bit 1 and the connecting end 2.

[0037] Insertion part 6: It is integrally formed on the connecting end 2 at the position corresponding to the side groove 5. The side away from the center point is arc-shaped. When it is inserted with the side groove 5, the end of the drill bit 1 and the two insertion parts 6 will form a complete cylinder, realizing the connection between the drill bit 1 and the connecting end 2.

[0038] Outer protrusion 7: It is provided on the insertion part 6. The insertion part 6 has a circular hole. An annular protrusion 11 is inserted into the inner side of the outer protrusion 7. An inner annular groove 8 is provided on its inner wall. It is part of the pin assembly and participates in the connection process between the drill end 1 and the connecting end 2.

[0039] Inner annular groove 8: It is formed on the inner wall of the circular hole and the outer protrusion 7, and is connected to the outer protrusion 7. It is used to engage with the annular protrusion 11 and plays a positioning and guiding role in the connection process.

[0040] Snap-fit ​​groove 9: It is formed on the inner wall of the side groove 5 on one side and is used to snap together with the pin assembly. When connecting the drill bit end 1 and the connecting end 2, one end of the annular protrusion 11 will be inserted into the snap-fit ​​groove 9 to complete the connection between the two.

[0041] Insertion block 10: The outer side is integrally formed with an annular protrusion 11, which is movably engaged with the inner annular groove 8. When connecting the drill bit end 1 and the connecting end 2, the insertion block 10 is pulled to the side away from the center point, the compression spring 12 is compressed, and then the insertion part 6 is inserted into the inside of the side groove 5. The insertion block 10 is released, the compression spring 12 rebounds and drives the annular protrusion 11 to move, so that one end of the insertion block 10 is engaged with the inside of the engagement groove 9.

[0042] The annular protrusion 11 is T-shaped, with one end inserted into the inside of the snap-fit ​​groove 9 and the other end fixedly connected to the end of the compression spring 12. The outer side is movably snapped into the inner annular groove 8, playing a key role in connection and positioning during the connection process.

[0043] Compression spring 12: It is fixedly installed inside the snap-fit ​​groove 9 on the side away from the center point. One end is fixedly connected to the annular protrusion 11. When connecting the drill bit end 1 and the connecting end 2, the annular protrusion 11 is moved by its own extension and contraction, thereby completing the connection and fixation of the two.

[0044] 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 multi-layer composite coated twist drill, characterized in that, It includes a drill bit end (1) and a connecting end (2) connected to the drill bit end (1). At least two sets of spiral grooves (3) are provided at one end of the drill bit end (1). The spiral grooves (3) are used to discharge the debris generated during drilling. The inner side of the spiral grooves (3) is integrally formed with a reinforcing blade (4). The outer side of the drill bit end (1) is provided with a composite coating.

2. The multi-layer composite coated twist drill according to claim 1, characterized in that: Two side grooves (5) are provided at the end of the drill bit end (1). The connecting end (2) has an integrally formed plug part (6) at the position corresponding to the side groove (5). The plug part (6) is engaged with the corresponding side groove (5).

3. The multi-layer composite coated twist drill according to claim 2, characterized in that: The side of the plug (6) away from the center point is arc-shaped. When the plug (6) is plugged into the side groove (5), the end of the drill bit (1) and the two plugs (6) will form a complete cylinder.

4. The multi-layer composite coated twist drill according to claim 2, characterized in that: One of the plug parts (6) is provided with a pin assembly, and a snap-fit ​​groove (9) is provided on the inner wall of the side groove (5) on one side, and the pin assembly is snapped together with the snap-fit ​​groove (9).

5. The multi-layer composite coated twist drill according to claim 4, characterized in that: The pin assembly includes an outer protrusion (7) and a plug block (10). A circular hole is provided on the plug part (6). An outer protrusion (7) is integrally formed on the outer wall of the plug part (6) at the position corresponding to the circular hole. An annular protrusion (11) is inserted into the inner side of the outer protrusion (7). The annular protrusion (11) is T-shaped. One end of the annular protrusion (11) is inserted into the inner side of the snap-fit ​​groove (9).

6. The multi-layer composite coated twist drill according to claim 5, characterized in that: The inner wall of the circular hole and the outer protrusion (7) is provided with an inner annular groove (8) to maintain communication. A compression spring (12) is fixedly installed on the side of the snap-fit ​​groove (9) away from the center point. An annular protrusion (11) is integrally formed on the outer side of the plug block (10). The annular protrusion (11) is movably snapped together with the inner annular groove (8). One end of the annular protrusion (11) is fixedly connected to the end of the compression spring (12).

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