Self-centering and self-tapping flat drill

Abstract

The utility model discloses a self-centering self-tapping flat drill, which comprises a drill handle and a cutting head arranged on the drill handle, the cutting head comprises a flat drill cutting part integrally arranged on the drill handle, the head part of the flat drill cutting part is provided with an asymmetrical self-tapping thread tip part, and the head part of the asymmetrical self-tapping thread tip part is provided with an asymmetrical self-tapping thread tip part. And the flat drill cutting part and the asymmetric self-tapping thread tip part are integrally formed. On the basis of reasonable design, centering and drilling can be rapidly and accurately carried out through the asymmetric self-tapping thread tip part, the problem of scrapping caused by deviation of subsequent drilling is greatly reduced, and use requirements can be better met.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling tools, in particular to a self-centering and self-tapping flat drill. Background Art

[0002] It is known that woodworking flat drills are mainly used for processing deep holes. Most of the current flat drills use a double-edged structure, which is not sharp and often cannot cut hard wood. In addition, due to uneven force during the cutting process, the drill often deviates, causing the processed shape to be deformed. The subsequent fine processing is required, and the processing accuracy and production efficiency are not high. In addition, the double-edged flat drills currently used also have the problems of large cutting resistance and poor chip removal, which in turn cause the defect of a low service life of woodworking flat drills. Therefore, there is a new type of woodworking flat drill disclosed in the Chinese utility model patent with authorization announcement number CN209699370U, in which the cutting head includes three cutting edges that are radially distributed with equal spacing and centered on the axis of the drill shank; a self-tapping thread groove is provided on the side surface of the upper end of each cutting edge, and an arc groove is also provided on the side surface of each cutting edge at the lower end of the self-tapping thread groove, and the arc groove includes a transverse arc groove and a drill tip arc groove that are sequentially arranged from the inside to the outside; a chip removal hole is provided on the cutting edge at the lower end of the arc groove, and a chip removal guide block that is inclined downward along one side of the cutting edge is provided in the chip removal hole, and each chip removal guide block is staggered with each other. In the above technical solution, there is a self-tapping thread head on the cutting head, but the self-tapping thread head is a thread added to the head. Since the head is a horizontal tip, this is not conducive to accurate centering, and the drilling accuracy is also poor. Once a deviation occurs in the subsequent drilling, the entire drill will be scrapped. Therefore, in order to improve the accuracy of accurate centering and drilling and reduce the problem of deviation, it is necessary to improve the existing technology. Utility Model Content

[0003] 1. Technical issues that need to be resolved

[0004] In view of the deficiencies in the prior art, the utility model provides a self-centering and self-tapping flat drill. Based on its reasonable design, its asymmetric self-tapping threaded tip can quickly and accurately center and drill holes, greatly reducing the problem of subsequent drilling deviations leading to scrapping, and is more conducive to meeting usage requirements.

[0005] (II) Technical solutions that need to be adopted

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A self-centering self-tapping flat drill comprises a drill shank and a cutting head arranged on the drill shank, wherein the cutting head comprises a flat drill cutting portion integrally arranged on the drill shank, the head of the flat drill cutting portion is provided with an asymmetric self-tapping thread tip, and the flat drill cutting portion and the asymmetric self-tapping thread tip are integrally formed.

[0008] Preferably, the asymmetric self-tapping thread tip includes a cone with an external thread, the cone head is provided with a pointed body, the pointed body is surrounded by arc edge 1, arc edge 2, arc edge 3 and arc edge 4, the arc edge 1, arc edge 2, arc edge 3 and arc edge 4 converge at the end of the pointed body, and the arc edge 1, arc edge 2, arc edge 3 and arc edge 4 form four tips on the cone head, the four tips include tip 1, tip 2, tip 3 and tip 4, and the tips 1, tip 2, tip 3 and tip 4 are inconsistent in height on the pointed body.

[0009] Preferably, the external threads are distributed in an inclined manner on the conical body.

[0010] Preferably, heat dissipation holes are provided on the external threads of the conical body which are in the same axial direction.

[0011] Preferably, the flat drill cutting portion is a flat structure, comprising a flat drill body, a main cutting edge being arranged on the upper end face of the flat drill body, a secondary cutting edge being arranged between the main cutting edge and the asymmetric self-tapping thread tip, and an angle between the main cutting edge and the end face of the flat drill body being inconsistent with an angle between the secondary cutting edge and the flat drill body.

[0012] Preferably, the included angle between the main cutting edge and the end face of the flat drill body and the included angle between the secondary cutting edge and the flat drill body are both obtuse angles.

[0013] (III) Technical effects to be achieved

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] Firstly, the cutting head of the utility model comprises a flat drill cutting part integrally arranged on the drill shank, the head of the flat drill cutting part is provided with an asymmetric self-tapping thread tip, the flat drill cutting part and the asymmetric self-tapping thread tip are integrally formed, and its reasonable design enables fast and accurate centering and drilling through the asymmetric self-tapping thread tip, which greatly reduces the problem of subsequent drilling deviation leading to scrapping, and is more conducive to meeting usage requirements.

[0016] Secondly, the asymmetric self-tapping thread tip of the utility model includes a conical body with an external thread, a pointed body is arranged at the head of the conical body, arc blade one, arc blade two, arc blade three and arc blade four are arranged around the pointed body, arc blade one, arc blade two, arc blade three and arc blade four converge at the end of the pointed body, and arc blade one, arc blade two, arc blade three and arc blade four form four tips at the head of the conical body, the four tips include tip one, tip two, tip three and tip four, and tip one, tip two, tip three and tip four are inconsistent in height on the tip body. Such asymmetric self-tapping thread tip is reasonably arranged, simple in structure, and easy to produce and manufacture, and is more conducive to fast and accurate centering and drilling through the asymmetric self-tapping thread tip, which greatly reduces the problem of scrapping caused by deviation in subsequent drilling, and is more conducive to meeting usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the structure of the flat drill cutting part and the asymmetric self-tapping thread tip of the utility model.

[0019] Figure 3 It is a schematic diagram of the top view of the asymmetric self-tapping thread tip of the utility model.

[0020] Figure 4 This is a schematic diagram of the utility model with heat dissipation holes on the external thread.

[0021] Figure 5 It is a schematic diagram of the structure of the cutting part of the flat drill of the utility model.

[0022] In the figure: 1, drill shank; 2, cutting head; 21, flat drill cutting part; 22, asymmetric self-tapping thread tip; 211, flat drill body; 212, main cutting edge; 213, secondary cutting edge; 221, external thread; 222, tapered body; 223, pointed body; 224, arc edge one; 225, arc edge two; 226, arc edge three; 227, arc edge four. DETAILED DESCRIPTION

[0023] In the description of the present utility model, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] In the description of the present utility model, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the scope of the utility model. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the utility model.

[0027] Example 1: See Figure 1 A self-centering and self-tapping flat drill comprises a drill shank 1 and a cutting head 2 arranged on the drill shank 1. The cutting head 2 comprises a flat drill cutting portion 21 integrally arranged on the drill shank 1. The head of the flat drill cutting portion 21 is provided with an asymmetric self-tapping thread tip 22. The flat drill cutting portion 21 and the asymmetric self-tapping thread tip 22 are integrally formed. The asymmetric self-tapping thread tip can quickly and accurately center and drill holes, which greatly reduces the problem of scrapping caused by deviation in subsequent drilling, and is more conducive to meeting usage requirements.

[0028] Embodiment 2: It can be explained on the basis of embodiment 1, such as Figure 2 and Figure 3 As shown, the asymmetric self-tapping thread tip 22 includes a conical body 222 with an external thread 221, a pointed body 223 is provided at the head of the conical body 222, and an arc edge 1 224, an arc edge 225, an arc edge 3 226 and an arc edge 4 227 are arranged around the pointed body 223, and the arc edge 1 224, the arc edge 225, the arc edge 3 226 and the arc edge 4 227 converge at the end of the pointed body 223, and the arc edge 1 224, the arc edge 225, the arc edge 3 226 and the arc edge 4 227 are at the head of the conical body 222. Four tips are formed, including tip one, tip two, tip three and tip four, and the tips one, tip two, tip three and tip four are not consistent in height on the tip body 223, so that an asymmetric self-tapping thread tip 22 is formed, which is beneficial for centering the wood at the first time through the four tips, and the drilling will be more accurate. After the tip body 223 drills into the wood, the conical body 222 with the external thread 221 will be automatically fed, which greatly saves physical strength and is more conducive to meeting the use requirements.

[0029] I want to explain that if Figure 2 As shown, the external thread 221 is distributed in an inclined shape on the conical body 222, which is more conducive to drilling and chip removal. Among them, the external thread 221 that is consistent with the axial direction of the conical body 222 is provided with a heat dissipation hole (indicated by a dotted line in the figure, as shown in FIG. Figure 4 As shown), this is more conducive to heat dissipation and improves the performance of the cone 222.

[0030] Among them Figure 5 As shown, the flat drill cutting portion 21 is a flat structure, and the flat drill cutting portion 21 includes a flat drill body 211. A main cutting edge 212 is arranged on the upper end face of the flat drill body 211, and a secondary cutting edge 213 is arranged between the main cutting edge 212 and the asymmetric self-tapping thread tip 22. The angle between the main cutting edge 212 and the end face of the flat drill body 211 is inconsistent with the angle between the secondary cutting edge 213 and the flat drill body 211. This arrangement is more conducive to hole expansion. In the present embodiment, the angle between the main cutting edge 212 and the end face of the flat drill body 211 and the angle between the secondary cutting edge 213 and the flat drill body 211 are both obtuse angles, and this arrangement is convenient for production and manufacturing.

[0031] It should be noted that although the above embodiments have been described in this article, this does not limit the scope of patent protection of the utility model. Therefore, based on the innovative concept of the utility model, changes and modifications to the embodiments described in this article, or equivalent structural or equivalent process changes made using the contents of the utility model specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the utility model patent.

Claims

1. A self-centering self-tapping flat drill, comprising a drill shank (1) and a cutting head (2) arranged on the drill shank (1), characterized in that: The cutting head (2) comprises a flat drill cutting portion (21) integrally arranged on the drill shank (1), the head of the flat drill cutting portion (21) being provided with an asymmetric self-tapping thread tip (22), and the flat drill cutting portion (21) and the asymmetric self-tapping thread tip (22) being integrally formed.

2. The self-centering self-tapping flat drill according to claim 1, characterized in that: The asymmetric self-tapping thread tip (22) comprises a conical body (222) with an external thread (221), the head of the conical body (222) is provided with a pointed body (223), the pointed body (223) is surrounded by arc edge 1 (224), arc edge 2 (225), arc edge 3 (226) and arc edge 4 (227), the arc edge 1 (224), arc edge 2 (225), arc edge 3 (226) and arc edge 4 (227) converge at the end of the pointed body (223), and the arc edge 1 (224), arc edge 2 (225), arc edge 3 (226) and arc edge 4 (227) form four tips at the head of the conical body (222), the four tips include tip 1, tip 2, tip 3 and tip 4, and the tips 1, tip 2, tip 3 and tip 4 are inconsistent in height on the pointed body (223).

3. The self-centering self-tapping flat drill according to claim 2, characterized in that: The external threads (221) are distributed in an inclined manner on the conical body (222).

4. The self-centering self-tapping flat drill according to claim 2 or 3, characterized in that: Heat dissipation holes are provided on the external threads (221) which are in the same axial direction as the conical body (222).

5. The self-centering self-tapping flat drill according to claim 1, 2 or 3, characterized in that: The flat drill cutting portion (21) is a flat structure, comprising a flat drill body (211), the upper end surface of the flat drill body (211) being provided with a main cutting edge (212), a secondary cutting edge (213) being provided between the main cutting edge (212) and the asymmetric self-tapping thread tip (22), and the included angle between the main cutting edge (212) and the end surface of the flat drill body (211) being inconsistent with the included angle between the secondary cutting edge (213) and the flat drill body (211).

6. The self-centering self-tapping flat drill according to claim 5, characterized in that: The included angle between the main cutting edge (212) and the end face of the flat drill body (211) and the included angle between the secondary cutting edge (213) and the flat drill body (211) are both obtuse angles.

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