Drill for processing carbon fiber

Abstract

This utility model belongs to the field of drill bit technology, specifically relating to a drill bit for carbon fiber processing. The drill bit for carbon fiber processing of this utility model includes: a cutter body and a cutter shank; an arc-shaped cutting edge is provided on the outer side of the drill tip of the cutter body; the number of arc-shaped cutting edges is three; the radius of the arc of the arc-shaped cutting edge R = 0.2D~0.4D, where D is the cutting diameter of the cutter body. This drill bit for carbon fiber processing of this utility model not only smoothly connects the drill tip and the cutting diameter D of the cutter body through the arc-shaped cutting edges, eliminating stress concentration points and providing wear resistance; but also, during drilling, the axial thrust of the cutting edge is smaller closer to the outer edge of the drill tip, thereby suppressing tearing at the hole exit. Furthermore, the three cutting edges enhance the drill bit's support capacity in the hole, improving drilling accuracy and ensuring hole roundness within 0.02mm; and the three-edge processing efficiency is 50% higher than that of a two-edge process.

Description

Technical Field

[0001] This utility model belongs to the field of drill bit technology, specifically relating to a drill bit for carbon fiber processing. Background Technology

[0002] Carbon fiber composites are typically difficult to machine, and one of the most obvious defects in drilling them is tearing at the hole exit, such as... Figure 1 As shown. The reason is that carbon fiber has high strength and high hardness, which accelerates tool wear. Its anisotropic properties also make conventional drills prone to delamination and tearing defects during machining. In response to the characteristics of carbon fiber, many tool companies have developed various drill bit structures, such as dagger drills, four-sided drills, and three-point drills. These drills have different characteristics and have solved the delamination and tearing problems in drilling to varying degrees. However, as customers' requirements for hole machining accuracy (hole roundness < 0.02mm) and tool life increase, none of the above-mentioned drill bit structures can simultaneously guarantee high precision and long tool life. Utility Model Content

[0003] The purpose of this invention is to provide a drill bit for carbon fiber processing to solve the technical problem that existing drill bits cannot simultaneously meet the requirements of high precision and long service life.

[0004] This application provides a drill bit for carbon fiber processing, including: a drill body and a drill shank; The outer side of the drill tip of the cutter body is provided with an arc-shaped cutting edge; The number of the arc-shaped cutting edges is three; The radius of the arc-shaped cutting edge is R = 0.2D to 0.4D, where D is the cutting diameter of the tool body.

[0005] In one embodiment of this application, the radius of the arc of the arc-shaped cutting edge is R = 0.25D to 0.35D.

[0006] In one embodiment of this application, the apex angle α of the drill tip is 90° to 120°.

[0007] In one embodiment of this application, the apex angle α of the drill tip is 100° to 120°.

[0008] In one embodiment of this application, the blade body is helical, and its helix angle β is 30° to 40°.

[0009] In one embodiment of this application, the helix angle β of the blade is 30° to 35°.

[0010] The beneficial effects of this utility model are: Unlike existing technologies, this application provides a carbon fiber processing drill bit, comprising: a cutter body and a shank; an arc-shaped cutting edge is provided on the outer side of the drill tip of the cutter body; the number of the arc-shaped cutting edges is three; the radius of the arc of the arc-shaped cutting edge is R = 0.2D~0.4D, where D is the cutting diameter of the cutter body. This carbon fiber processing drill bit, through the arc-shaped cutting edges, not only smoothly connects the drill tip to the cutting diameter D of the cutter body, eliminating stress concentration points and providing wear resistance; but also, during drilling, the axial thrust of the cutting edge is smaller closer to the outer edge of the drill tip, thereby suppressing tearing at the hole exit. Furthermore, the three cutting edges enhance the drill bit's support capacity in the hole, improving drilling accuracy and ensuring hole roundness within 0.02mm; and the three-edge processing efficiency is 50% higher than that of a two-edge process.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of defects in carbon fiber composite materials after drilling. Figure 2 This is a schematic diagram of a four-sided drill; Figure 3 This is a schematic diagram of a three-pointed drill. Figure 4 This is a front view of a preferred embodiment of the carbon fiber processing drill bit of this utility model; Figure 5 This is a side view of a preferred embodiment of the carbon fiber processing drill bit of this utility model; Figure 6 This is a schematic diagram of a preferred embodiment of the present invention, showing a drill bit for carbon fiber processing after drilling a hole in a carbon fiber composite material.

[0015] In the diagram: tool body 1, drill tip 11, curved cutting edge 12, tool holder 2. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] To address the characteristics of carbon fiber materials, many tool companies have developed various drill bit structures, such as dagger drills, four-sided drills, and three-point drills. These drill bits have different features and have all solved the problems of delamination and tearing in drilling to varying degrees. However, as customers' requirements for hole machining accuracy (hole roundness < 0.02 mm) and tool life increase, none of the above-mentioned drill bit structures can simultaneously meet the requirements of ensuring high precision and long tool life.

[0018] See Figure 2 Taking a four-sided drill as an example, its characteristic is that the drill tip has two cutting edges with different angles. The central cutting edge of the drill tip has an angle of 90° to 140°, and its main function is to center and remove most of the cutting allowance. The outer cutting edge has a small and sharp angle of 5° to 20°, and its main function is to cut the carbon fiber when exiting the hole, reducing tearing. However, its disadvantages are that the central drill tip angle is large, and it is a two-flute drill bit, resulting in low positioning accuracy and insufficient support in the hole, causing the roundness of the hole to generally exceed 0.02mm.

[0019] See Figure 3 Taking a three-point drill as an example, its characteristics include one central drill tip and two outer edge drill tips, which can reduce the axial force when exiting the hole. Furthermore, the two outer edge drill tips are very sharp and can cut carbon fibers, reducing tearing. However, its disadvantage is that the two outer edge cutting tips are too sharp, are prone to wear, and have a relatively short service life.

[0020] To address the existing technical problems, one embodiment of this application provides a drill bit for carbon fiber processing. Detailed descriptions are provided below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0021] See Figure 1 and Figure 2In one embodiment, the drill bit for carbon fiber processing includes: a cutter body 1 and a cutter shank 2; the rear end of the cutter shank 2 can be connected to a machine tool, and the front end is connected to the rear end of the cutter body 1; an arc-shaped cutting edge 12 is provided on the outer side of the drill tip 11 of the cutter body 1; the number of the arc-shaped cutting edges 12 is three; the radius of the arc of the arc-shaped cutting edge 12 is R=0.2D~0.4D, where D is the cutting diameter of the cutter body 1.

[0022] Preferably, the radius of the arc of the arc-shaped cutting edge 12 is R = 0.25D to 0.35D.

[0023] Optionally, the apex angle α of the drill tip 11 is 90° to 120°.

[0024] Preferably, the apex angle α of the drill tip 11 is 100° to 120°.

[0025] Optionally, the blade body 1 is helical, with a helix angle β of 30° to 40°.

[0026] Preferably, the helix angle β of the blade body 1 is 30° to 35°.

[0027] In this embodiment, the arc-shaped cutting edge 12 not only smoothly connects the drill tip 11 to the cutting diameter D (i.e., the outer wall of the tool body 1) of the tool body 1, eliminating stress concentration points and providing wear resistance, but also reduces the axial thrust of the cutting edge closer to the outer edge of the drill tip during drilling, thereby suppressing tearing at the hole. Furthermore, the three cutting edges enhance the drill bit's support in the hole, improving drilling accuracy and ensuring a hole roundness within 0.02 mm. The three-edge design also increases machining efficiency by 50% compared to a two-edge design.

[0028] This utility model presents a carbon fiber machining drill bit with an arc-shaped cutting edge and a three-flute design. Compared to a conventional two-flute carbon fiber drill bit, it achieves a comprehensive improvement in the efficiency, hole roundness, and tool life of carbon fiber hole machining, resulting in machining effects such as... Figure 6 As shown.

[0029] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0030] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.

Claims

1. A drill bit for carbon fiber processing, characterized in that, include: Blade (1) and handle (2); The outer side of the drill tip (11) of the cutter body (1) is provided with an arc-shaped cutting edge (12). The number of the arc-shaped cutting edges (12) is three; The arc radius of the arc-shaped cutting edge (12) is R = 0.2D ~ 0.4D, where D is the cutting diameter of the tool body (1).

2. The drill bit for carbon fiber processing according to claim 1, characterized in that, The radius of the arc of the arc-shaped cutting edge (12) is R = 0.25D ~ 0.35D.

3. The drill bit for carbon fiber processing according to claim 1, characterized in that, The apex angle α of the drill tip (11) is 90° to 120°.

4. The drill bit for carbon fiber processing according to claim 1, characterized in that, The apex angle α of the drill tip (11) is 100° to 120°.

5. The drill bit for carbon fiber processing according to claim 1, characterized in that, The blade (1) is spiral-shaped with a spiral angle β of 30° to 40°.

6. The drill bit for carbon fiber processing according to claim 5, characterized in that, The helix angle β of the blade body (1) is 30° to 35°.

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