Self drilling screw

Abstract

The utility model discloses a self drilling screw which comprises a nut part, a thread part and a drill tail part, the drill tail part comprises at least three drill edges, and the drill edges are gathered at the center to form a positioning tip. The drill edge comprises an inclined edge inclining outwards from the positioning tip and a straight edge extending from the inclined edge to the thread part. The self drilling screw is provided with the three or four drilling edges, the positioning tips in the middle of the multiple drilling edges are easy to balance and position, at least two drilling edges can work for drilling at the same time, operation is easy, speed is higher, drilling stability, drilling speed and drilling efficiency are effectively improved, melting of a drill tail and loss of the self drilling screw are avoided, and the service life of the self drilling screw is prolonged. Meanwhile, physical exhaustion of workers is reduced.

Description

Technical Field

[0001] The utility model relates to a self-drilling screw, belonging to the technical field of hardware installation auxiliary parts. Background Art

[0002] The existing self-drilling screws on the market take a long time to install on thick iron plates, it is very difficult to drill through the iron plates, and it will also cause overheating and burning out and melting of the drill tail, resulting in the loss of the drill edge, so that the self-drilling screw needs to be replaced to continue drilling. Sometimes, it is necessary to replace 3 self-drilling screws to drill through the thick iron plate, which increases the installation time and wastes the self-drilling screws.

[0003] On the other hand, when the existing self-drilling screws are drilling holes, it is necessary to grasp the balance positioning of the drill tail tip. If the positioning is unbalanced, one of the drill edges will have poor contact, which will also affect the drilling time, and it is easy to slip. When the staff slips during the force application process, it will affect the safety of the staff, especially the safety of the staff at high positions. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problems of the existing technology and provide a self-drilling screw with faster drilling speed and more stable positioning.

[0005] The purpose of the utility model is realized through the following technical solutions:

[0006] A self-drilling screw, comprising a nut portion, a threaded portion and a drill tail portion, characterized in that the drill tail portion includes at least three drill edges, and a plurality of the drill edges converge at the center to form a positioning tip.

[0007] A self-drilling screw as described above, characterized in that each of the drill edges includes an inclined edge inclined outward from the positioning tip and a straight edge extending from the inclined edge to the threaded portion.

[0008] A self-drilling screw as described above, characterized in that one side of the same side of the inclined edge and the straight edge is a plane, forming a straight plane of the drill edge, the other side of the inclined edge is a slope or a cone surface, and the other side of the straight edge is a curved surface.

[0009] A self-drilling screw as described above, characterized in that the drill edge is integrally cut or integrally extruded.

[0010] A self-drilling screw as described above, characterized in that the number of the drill edges is four.

[0011] A self-drilling screw as described above, characterized in that a plurality of the drill edges are evenly distributed circumferentially.

[0012] A self-drilling screw as described above, characterized in that the nut portion is a cross nut or a hexagonal nut.

[0013] A self-drilling screw as described above, characterized in that the other side of the inclined edge is composed of one inclined plane or two inclined planes.

[0014] A self-drilling screw as described above, characterized in that there is an inclined plane or a curved surface transition between the drill edge and the threaded portion.

[0015] Compared with the prior art, the present utility model has the following advantages:

[0016] The self-drilling screw of the present utility model has three or four drill edges. The positioning tip in the middle of multiple drill edges is easy to balance and position, ensuring that at least two drill edges can work simultaneously for drilling. It is easy to operate, has a faster speed, effectively improves the drilling stability, drilling speed and drilling efficiency, avoids the melting of the drill tail and the loss of the self-drilling screw, and at the same time reduces the physical consumption of the staff.

[0017] Attach a 0.3mm iron sheet to a 6mm thick angle iron, and one self-drilling screw of the present utility model can be used to achieve drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 One of the three-tail self-drilling screw's three-dimensional structure schematic diagrams;

[0019] Figure 2 Another three-tail self-drilling screw's three-dimensional structure schematic diagram;

[0020] Figure 3 The four-tail self-drilling screw's three-dimensional structure schematic diagram;

[0021] Figure 4 Partial structure three-dimensional schematic diagram of the four-tail self-drilling screw. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present utility model will be further described in detail below with reference to the drawings.

[0023] As Figures 1-4 shown, a self-drilling screw includes a nut portion 1, a threaded portion 2 and a drill tail portion 3. The drill tail portion 3 includes at least three drill edges 31, and multiple drill edges 31 converge at the center to form a positioning tip 32. During drilling, the positioning tip 32 is balanced and positioned by at least three drill edges 31, with a faster drilling speed and less loss.

[0024] Each drill edge 31 includes an inclined edge 311 that inclines outward from the positioning tip 32 and a straight edge 312 that extends from the inclined edge 311 to the threaded portion 2. The positioning tip 32 is the most prominent point. After positioning, the screw can quickly drill a metal plate from the positioning tip 32 along the inclined edge 311 to the straight edge 312.

[0025] Preferably, one side of the inclined cutting edge 311 and the straight cutting edge 312 is a flat surface, forming a straight plane 313 of the drill cutting edge 31. The other side of the inclined cutting edge 311 is an inclined surface or a conical surface 314, and the other side of the straight cutting edge 312 is a curved surface 315, reducing the resistance during drilling.

[0026] In order to better process and form the drill tail, the other side of the inclined cutting edge 311 can be composed of one inclined surface or two inclined surfaces. There is an inclined surface or a curved surface transition between the drill cutting edge 31 and the threaded part 2. While forming the drill cutting edge, ensure that the drill cutting edge 31 has a certain thickness, ensure the connection strength between the drill cutting edge 31 and the threaded part 2, and make the drilling more powerful.

[0027] In another embodiment of the present invention, there are four drill cutting edges 31, and preferably the drill cutting edges 31 are evenly distributed circumferentially. Multiple drill cutting edges 31 bisect the radial plane, which is more conducive to the balanced positioning of the positioning tip 32 and rapid hole breaking. The straight planes of the three drill cutting edges 31 evenly divide the radial circular surface at 120 degrees, and the four drill cutting edges 41 are distributed in a cross shape to evenly divide the circular surface.

[0028] The nut part 1 of the present invention can be a cross nut or a hexagonal nut, as long as it is convenient for operation.

[0029] Using the drill tail screw of the present invention and the two-tail drill tail screw on the market to conduct drilling tests on the same materials of 6mm angle iron and 0.3mm iron sheet. Three drill tail screws are required for the two-tail drill tail screw, and it takes 3 minutes to drill through the hole. While for the three-tail screw of the present invention, it can drill through in 2 minutes, and for the four-tail screw, one hole can be drilled through in 80 - 90 seconds. In all cases, there is no need to replace the drill tail screw, and one can drill through.

Claims

1. A self-drilling screw, comprising a nut portion (1), a threaded portion (2) and a drill tail portion (3), characterized in that: The drill tail portion (3) includes at least three drill edges (31), and a plurality of the drill edges (31) converge at the center to form a positioning tip (32).

2. A self-drilling screw according to claim 1, characterized in that Each of the drill edges (31) includes an inclined edge (311) inclined outward from the positioning tip (32) and a straight edge (312) extending from the inclined edge (311) toward the threaded portion (2).

3. A self-drilling screw according to claim 2, characterized in that One side of the inclined edge (311) and the straight edge (312) is a flat surface, forming a straight plane of the drill edge (31), the other side of the inclined edge (311) is an inclined surface or a conical surface, and the other side of the straight edge (312) is a curved surface.

4. A self-drilling screw according to any one of claims 1 to 3, characterized in that The drill edge (31) is integrally formed by cutting or integrally formed by extrusion.

5. A self-drilling screw according to claim 1, wherein The number of the drill edges (31) is four.

6. A self-drilling screw according to claim 1 or 5, characterized in that A plurality of the drill edges (31) are circumferentially and uniformly distributed.

7. A self-drilling screw according to claim 1, characterized in that The nut portion (1) is a cross nut or a hexagonal nut.

8. A self-drilling screw according to claim 3, characterized in that The other side of the inclined edge (311) is composed of one inclined surface or two inclined surfaces.

9. A self-drilling screw according to claim 1 or 3, characterized in that There is a transition of an inclined surface or a curved surface between the drill edge (31) and the threaded portion (2).

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