A single-faced fishtail-shaped drill bit

Abstract

This utility model discloses a single-faced fishtail-shaped drill bit, relating to the field of drill bit technology, including a drill tip and a chip removal groove. The drill tip has only one main cutting face, with an angle α of 20° to 25°. The drill tip has a fishtail-shaped structure with a fishtail angle b of 150° to 170°. During drilling, the main cutting face cuts the flexible material of a flexible circuit board or the high-toughness copper foil of a thick copper circuit board. This utility model adopts a drill tip structure combining a single large-angle main cutting face with an ultra-wide fishtail angle, coupled with a chip removal groove with a specific helix angle. During drilling, the main cutting face cuts the flexible material and tough copper foil at a sharper angle, and the wide fishtail angle controls the amount of material cut in a single pass, resulting in fragmented waste that is quickly discharged through the optimized chip removal groove. This structure effectively avoids the problems of burrs and wire entanglement at the hole edge produced by traditional drill bits, while the diamond coating ensures long-term processing stability and drill bit life.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a single-faced fishtail-shaped drill bit, which is especially suitable for drilling flexible circuit boards and thick copper circuit boards. Background Technology

[0002] There are two types of drill bits used in the process of drilling holes in circuit boards: drill tip type and fish tail type. They are generally used for drilling holes in fiberglass boards.

[0003] However, neither of these drill bits is suitable for drilling flexible circuit boards or thick copper circuit boards, as they will result in burrs and wire entanglement at the hole edges. Due to the flexibility of flexible circuit board materials and the high toughness of copper foil in thick copper circuit boards, the cutting face of the drill bit needs to have a larger angle and a sharper cut to ensure that flexible boards and thick copper materials can be cut smoothly without producing burrs. At the same time, it is also necessary to ensure that the tough waste generated during the cutting process can be smoothly discharged through the chip removal groove in time to solve the wire entanglement problem.

[0004] To address the aforementioned problems, this utility model proposes a single-faced fishtail-shaped drill bit. Utility Model Content

[0005] To address the problems existing in the background technology, this utility model proposes a single-faced fishtail-shaped drill bit.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a single-faced fishtail-shaped drill bit for drilling flexible circuit boards and thick copper circuit boards to solve the problems of burrs and wire entanglement at the hole edge during drilling. The drill bit includes a shank and a drill bit, the rear end of which is connected to the shank, and the front end of which forms a fishtail tip structure. The drill bit is characterized by having a main cutting face at its tip, and side cutting edges on both sides of its outer circumference. The angle α of the main cutting face is 20° to 25°; the fishtail angle b of the drill bit is 150° to 170°. During drilling, the main cutting face cuts the flexible material of the flexible circuit board or the high-toughness copper foil of the thick copper circuit board, and the waste generated during cutting is smoothly discharged through a chip removal groove, avoiding burrs and wire entanglement at the hole edge. The present invention is further configured such that the angle α of the main cutting surface is 23°. This angle range can further reduce the extrusion deformation of the flexible material of the flexible circuit board while ensuring the cutting sharpness, reduce the risk of tearing of the copper foil of the thick copper circuit board, and optimize the processing quality of the hole edge. The present invention is further configured such that the fishtail angle b is 150°. This angle range can precisely control the downward cutting amount of the drill bit per revolution, so that the waste generated by cutting is in the form of chips rather than filaments, thus preventing the occurrence of wire entanglement problem from the source. The present invention is further configured such that the helix angle of the chip removal groove is 30° to 35°, which is adapted to the cutting angle of the main cutting face of 20° to 25°, which can significantly improve the conveying efficiency of waste in the chip removal groove, prevent waste from accumulating in the drilling area, and further ensure the processing effect of no wire entanglement and no burrs. The present invention is further configured such that the cutting edge of the main cutting face is treated with a diamond coating, and the hardness of the diamond coating is ≥HV2800; the diamond coating can enhance the wear resistance and cutting sharpness of the main cutting face, extend the service life of the drill bit, and at the same time ensure that the problems of burrs and wire wrapping at the hole edge are stably solved in the long-term drilling of flexible materials of soft circuit boards and high-toughness copper foil of thick copper circuit boards.

[0007] Compared with the prior art, the beneficial effects of this utility model are: This invention addresses the inherent flexibility of flexible circuit board materials and the high toughness of copper foil in thick copper circuit boards. It utilizes a drill tip structure combining a single, large-angle main cutting face with an ultra-wide fishtail angle, along with a chip removal groove with a specific helix angle. During drilling, the main cutting face cuts the flexible material and tough copper foil at a sharper angle, while the wide fishtail angle controls the amount of material cut in a single pass, resulting in fragmented waste that is quickly discharged through the optimized chip removal groove. This effectively avoids the burrs and wire entanglement problems associated with traditional drill bits.

[0008] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the drill bit structure of this utility model; Figure 3 This is a schematic diagram of the front structure of this utility model; Figure 4 This is a schematic diagram of the angle 'a' of the main blade surface and the included angle 'b' of the fish tail of this utility model.

[0010] Reference numerals: 1. Drill bit; 2. Chip groove; 3. Main cutting face; 4. Side cutting tool. Detailed Implementation

[0011] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0012] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0013] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0014] Please see Figure 1-4 This utility model provides a technical solution: a single-faced fishtail-shaped drill bit for drilling flexible circuit boards and thick copper circuit boards to solve the problems of burrs and wire entanglement at the hole edge during the drilling process. It includes a shank and a drill bit 1, the rear end of which is connected to the shank, and the front end of the drill bit 1 has a fishtail tip structure. Side cutters 4 are provided on both sides of the outer circumference of the drill bit 1. The drill bit 1 includes a drill tip and a chip removal groove 2. The drill tip has only one main cutting face 3, the angle α of which is 20° to 25°. The drill tip 1 has a fishtail-shaped structure with a fishtail included angle b of 150° to 170°. During drilling, the main cutting face 3 cuts the flexible material of the flexible circuit board or the high-toughness copper foil of the thick copper circuit board, and the waste generated during cutting is smoothly discharged through the chip removal groove 2, avoiding burrs and wire entanglement at the hole edge. The flexible circuit board material possesses flexibility, while the copper foil of the thick copper circuit board exhibits high toughness. This structure effectively addresses the cutting deformation issues arising from material flexibility and the cutting resistance problems associated with the high-toughness copper foil.

[0015] The angle a of the main cutting face 3 is 23°. This angle range can further reduce the extrusion deformation of the flexible material of the flexible circuit board while ensuring the cutting sharpness, reduce the risk of tearing of the copper foil of the thick copper circuit board, and optimize the processing quality of the hole edge. The fishtail angle b is 150°. This angle range can precisely control the downward cutting amount of drill bit 1 per revolution, so that the waste generated by cutting is in the form of chips rather than filaments, thus preventing the occurrence of wire entanglement problem from the source.

[0016] The helix angle of the chip removal groove 2 is 30° to 35°. This helix angle is adapted to the cutting angle a of the main cutting face 3, which can significantly improve the conveying efficiency of waste in the chip removal groove, prevent waste from accumulating in the drilling area, and further ensure the machining effect of no wire entanglement and no burrs. The cutting edge of the main cutting face 3 is treated with a diamond coating, and the hardness of the diamond coating is ≥HV2800. The diamond coating can enhance the wear resistance and cutting sharpness of the main cutting face 3, extend the service life of the drill bit 1, and at the same time ensure that the problems of burrs and wire wrapping at the hole edge are stably solved in the long-term drilling of flexible materials of soft circuit boards and high-toughness copper foil of thick copper circuit boards.

[0017] In summary, by using a single large-angle main cutting face a (20°-25°) to provide a sufficiently sharp cutting edge, the extrusion deformation of soft materials and tough copper foil is effectively reduced, preventing burrs from forming at the source. Combined with an ultra-wide fishtail angle b (150°-170°) to control the cutting amount per revolution, the waste material is broken into fragments that are not easily entangled. Furthermore, by optimizing the helix angle of the chip removal groove (30°-35°) in synergy with the cutting angle, an efficient chip removal channel is formed, ensuring timely chip discharge. Finally, a high-hardness diamond coating (≥HV2800) is used to maintain the cutting edge's long-lasting sharpness, thus systematically solving the problems of burrs and wire entanglement in drilling flexible circuit boards and thick copper circuit boards.

[0018] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A single-faced fishtail-shaped drill bit for drilling flexible circuit boards and thick copper circuit boards, comprising a shank and a drill bit (1), wherein the rear end of the drill bit (1) is connected to the shank, and the front end of the drill bit (1) has a fishtail tip structure; characterized in that, The drill bit (1) has a main cutting face (3) at its tip and side cutting edges (4) on both sides of its outer circle. The angle a of the main cutting face (3) is 20° to 25°. The fish tail angle b of the drill bit (1) is 150° to 170°. The fish tail tip angle c of the drill bit is 65° to 70°.

2. The single-faced fishtail-shaped drill bit according to claim 1, characterized in that, The angle a of the main cutting face (3) is 23°, and the fishtail angle b of the drill bit (1) is 150°.

3. The single-faced fishtail-shaped drill bit according to claim 1, characterized in that, The drill bit (1) has a chip removal groove (2) for smoothly discharging waste material during the cutting process.

4. The single-faced fishtail drill bit according to any one of claims 1 to 3, characterized in that, The drill bit (1) is suitable for drilling flexible circuit board materials and thick copper foil materials with high toughness.

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