Cutting thread tap bolt

Abstract

The utility model discloses a cutting thread tap bolt which comprises a bolt body, and the bolt body comprises a head portion, a shaft portion and an external thread arranged on the shaft portion. A spiral cutting groove is formed in the external thread, and an axial cutting edge is formed at the joint of the surface of the external thread and the cutting groove. In conclusion, the defects in the prior art are overcome, the design is reasonable, the influence of the coating on the size of the mounting hole can be avoided by forming the cutting groove and the cutting edge, the application range is widened, and high social use value and application prospects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to a self-tapping bolt with a cutting thread. Background Technology

[0002] Bolts are used to fasten objects. After the mounting hole is coated or the surface is treated with a coating, the increased coating thickness reduces the gap between the internal and external threads, resulting in a tight fit. When using ordinary machine thread bolts for assembly, it is not easy to screw them in. If forced in, misalignment or seizing may occur, increasing the assembly difficulty, reducing assembly efficiency and quality, and also bringing defects and safety hazards to the product.

[0003] To solve the above problems, a self-tapping bolt with a cutting groove and a cutting edge is provided to avoid the influence of the coating on the size of the mounting hole. Utility Model Content

[0004] In order to solve the problems mentioned in the background art, the present invention provides a self-tapping bolt with cutting threads.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A self-tapping bolt with a cutting thread includes a bolt, the bolt including a head, a shaft portion and an external thread disposed on the shaft portion; the external thread has a helical cutting groove, and the connection between the surface of the external thread and the cutting groove forms an axial cutting edge.

[0007] Preferably, the external thread includes thread teeth disposed on the shaft portion, and the thread teeth are triangular threads.

[0008] Preferably, the head and the shaft are integrally formed.

[0009] Preferably, the cutting groove is helical, and the direction of the helix is ​​opposite to the direction of the external thread.

[0010] Preferably, the number of cutting grooves is four to six, and they are distributed at equal angles on the shaft.

[0011] Preferably, the outer end face of the head has a concave portion for receiving the tool.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. When bolts are used on products that are prone to size issues, such as electrophoresis and spraying, the connection between the external thread surface and the cutting groove forms an axial cutting edge. When the bolt rotates, the cutting edge removes the paint or coating that is obstructing the hole through the cutting groove. At the same time, the thread fit penetrates deeper into the mounting hole. Continuous rotation of the bolt allows the paint in the mounting hole to be completely removed by the cutting of multiple cutting edges. This enables the removal of paint obstacles in the mounting hole by utilizing the bolt's own rotational cutting force, facilitating the assembly of the coated product.

[0014] 2. When the bolt is used on non-metallic or flexible metal products, it can be directly fastened to the object. Only the pilot hole needs to be pre-machined, and tapping is not required, which improves efficiency and saves costs. When the bolt is tightened, the cutting edge can cut and lock itself, and the cutting waste is discharged through the cutting groove. Compared with self-tapping screws, this bolt can be disassembled and reassembled more often.

[0015] In summary, this utility model overcomes the shortcomings of the prior art, has a reasonable design, and can avoid the influence of the coating on the size of the mounting hole by opening the cutting groove and cutting edge, thereby improving the scope of application and having high social use value and application prospects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0019] Figure 3 This is a partial structural schematic diagram of the present invention.

[0020] In the figure: Bolt 1, Head 11, Shaft 12, External Thread 13, Thread Tooth 131, Cutting Groove 14, Cutting Edge 141. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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.

[0022] Example 1

[0023] Reference Figure 1-3 A self-tapping bolt with a cutting thread includes a bolt 1. The bolt 1 includes a head 11, a shaft 12, and an external thread 13 disposed on the shaft 12. The head 11 and the shaft 12 are integrally formed. The external thread 13 is a standard threaded part formed by a roll forming method. The bolt 1 is a standard right-hand threaded bolt.

[0024] Furthermore, in this embodiment, a concave portion for receiving the tool is formed in the head 11; however, the shape of the head 11 is arbitrary and can be a typical hexagon.

[0025] Furthermore, the external thread 13 includes a thread tooth 131 disposed on the shaft portion 12, and the thread tooth 131 is a triangular thread.

[0026] The external thread 13 has a spiral cutting groove 14. The connection between the surface of the external thread 13 and the cutting groove 14 forms an axial cutting edge 141. When the bolt 1 is screwed into the mounting hole, the bolt 1 rotates as it is screwed in. The cutting edge 141 removes the obstructing paint or coating through the cutting groove 14 and pushes it deeper into the mounting hole through the threaded engagement. The continuous rotation of the bolt 1 completely removes the paint in the mounting hole under the cutting force of multiple cutting edges 141. This allows the bolt 1 to remove the paint obstruction in the mounting hole by its own rotational cutting force, which is convenient for the assembly of the coated product.

[0027] Furthermore, the helical direction of the cutting groove 14 is opposite to the helical direction of the external thread 13.

[0028] Furthermore, the number of cutting grooves 14 is four to six, which are evenly distributed on the shaft portion 12.

[0029] Furthermore, when using bolt 1, it can be used with epoxy glue or screw anti-loosening glue to improve assembly efficiency.

[0030] For the above example, those skilled in the art should know that when implementing the above technical solution, bolt 1 is a standard bolt, for example, bolt 1 is a DIN7513 bolt.

[0031] Working principle: When bolt 1 is used on products that are easily affected by dimensions, such as electrophoresis and spraying, the surface of the external thread 13 and the cutting groove 14 form an axial cutting edge 141. When bolt 1 rotates, the cutting edge 141 removes the paint or coating that is obstructing the hole through the cutting groove 14. At the same time, it penetrates into the mounting hole through the thread engagement. Continuous rotation of bolt 1 makes the paint in the mounting hole completely removed by the cutting of multiple cutting edges 141. It can realize the removal of paint obstacles in the mounting hole by the cutting force of bolt 1's own rotation, which is convenient for the assembly of the coated product.

[0032] When bolt 1 is used for non-metallic or flexible metal products, it can be directly fastened to the object. Only the pilot hole needs to be pre-machined, and tapping is not required, which improves efficiency and saves costs. When bolt 1 is tightened, the cutting edge 141 can cut and lock itself, and the cutting waste is discharged through the cutting groove 14. Compared with self-tapping screws, which will fail after 8 disassemblies and reassemblies, this bolt can be disassembled and reassembled many more times.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 are not intended to 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.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A self-tapping bolt with a cutting thread, characterized in that, include Bolt (1), the bolt (1) includes a head (11), a shaft (12) and an external thread (13) provided on the shaft (12); The external thread (13) is provided with a spiral cutting groove (14), and an axial cutting edge (141) is formed at the connection between the surface of the external thread (13) and the cutting groove (14).

2. The self-tapping bolt with cutting threads according to claim 1, characterized in that: The external thread (13) includes thread teeth (131) provided on the shaft portion (12), and the thread teeth (131) are triangular threads.

3. A self-tapping bolt with a cutting thread according to claim 1, characterized in that: The head (11) and the shaft (12) are integrally formed.

4. A self-tapping bolt with a cutting thread according to claim 1, characterized in that: The cutting groove (14) is helical, and the direction of the helix is ​​opposite to the direction of the external thread (13).

5. A self-tapping bolt with a cutting thread according to claim 1, characterized in that: The number of cutting grooves (14) is four to six, and they are distributed at equal angles on the shaft (12).

6. A self-tapping bolt with a cutting thread according to claim 5, characterized in that: The outer end face of the head (11) has a concave portion for receiving the tool.

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