Traceless high-strength pressing rivet screw

Abstract

The utility model relates to the technical field of fastening connecting pieces, in particular to a traceless high-strength pressing rivet screw which comprises a stud and a head portion which are coaxially arranged, the outer wall face of the head portion is in an inclined shape, the outer wall face gradually inclines towards the side close to the central axis in the pressing-in direction of the head portion, and therefore it is guaranteed that in the pressing-in process of the pressing rivet screw, the outer wall face of the head portion gradually inclines towards the side close to the central axis. Finally, traceless embedding is realized, and the aesthetic property is ensured. The spline teeth are uniformly distributed on the outer wall surface of the head part, so that the pressing rivet screw can be completely embedded, the safety can be ensured in an application scene, and accidents caused by protruding of the screw head are avoided; and meanwhile, interference in space can be reduced, and normal assembly and operation of all components are ensured. The extrusion component is arranged between the stud and the head part, so that a workpiece between the stud and the head part is extruded to deform and is embedded into the annular concave part in the embedding process of the pressing rivet screw, the phenomenon that the workpiece warps upwards is avoided, the screw is prevented from axially loosening, and the connection tightness is ensured.

Description

Technical Field

[0001] This utility model relates to the field of fastening connectors, and in particular to a non-marking, high-strength press-fit screw. Background Technology

[0002] Press-fit screws are a common type of fastener, typically consisting of a head and a shank. The head often comes in various shapes, such as hexagonal or round, while the shank is threaded. In practical applications, the press-fit process does not require specialized welding equipment, resulting in high production efficiency and relatively low cost, making it widely used in industrial production and assembly.

[0003] In existing technologies, any ridge line on the outer wall of the head of a press-fit screw is parallel to the screw axis. This type of press-fit screw cannot achieve seamless insertion during the head pressing process, leaving assembly marks on the surface of the connector and affecting its appearance. Furthermore, traditional press-fit screws are prone to loosening and falling out during insertion, thus affecting the tightness of the connection. Utility Model Content

[0004] The purpose of this utility model is to provide a non-marking, high-strength press-fit screw to solve the problem that press-fit screws leave marks during the embedding process in the prior art, and to further solve the problem that press-fit screws are prone to loosening after embedding in the prior art.

[0005] The technical solution of this utility model is: a traceless high-strength press-fit screw, including a stud and a head arranged coaxially, wherein the outer wall surface of the head is inclined, and in the pressing direction of the head, the outer wall surface gradually inclines towards the side closer to the central axis.

[0006] Preferably, the outer wall surface of the head has an inclination angle of 3-5°.

[0007] Preferably, the outer wall of the head has evenly distributed serrations.

[0008] Preferably, the head is configured as a frustum-shaped structure, and the flower teeth are distributed in a ring array around the frustum-shaped structure.

[0009] Preferably, the tip of each tooth of the flower pattern is arc-shaped, and the width of the arc at the tip of each tooth gradually increases in the direction of head pressing.

[0010] Preferably, the head is configured as a polygonal frustum structure, and the serrations are evenly distributed on each end face of the polygonal frustum.

[0011] Preferably, the tip of each tooth of the flower pattern is planar, and the straight width of the tip of each tooth gradually increases in the pressing direction of the head.

[0012] Preferably, a pressing member is further provided between the stud and the head; the pressing member includes an annular protrusion near one end of the stud and an annular recess near one end of the head.

[0013] Preferably, the outer diameter of the annular protrusion is larger than the major diameter of the stud, and the outer diameter of the annular recess is smaller than the major diameter of the stud.

[0014] Preferably, the stud, the annular protrusion, the annular recess, and the head are constructed as an integral structure.

[0015] Preferably, the end of the stud furthest from the head is provided with a first chamfer.

[0016] Preferably, an arc-shaped second chamfer is provided between the annular recess and the head, and between the annular recess and the annular protrusion.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] (1) This application sets the outer wall of the head of the press-fit screw to be inclined, and in the head pressing direction, the outer wall gradually tilts towards the side closer to the central axis, thereby ensuring that the press-fit screw can be finally embedded without leaving a mark during the pressing process, thus ensuring aesthetics.

[0019] (2) By evenly distributing the tooth pattern on the outer wall of the head, the press-fit screw can be fully embedded, which can ensure safety in the application scenario and avoid accidents caused by the protruding screw head; at the same time, it can reduce spatial interference and ensure normal assembly and operation between various components.

[0020] (3) A compression member is provided between the stud and the head, so that the workpiece between the stud and the head is compressed and deformed during the embedding process of the press screw, and is embedded in the annular recess, so as to avoid the workpiece from tilting upward and prevent the screw from loosening axially, thus ensuring the connection tightness. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of a non-marking high-strength press-fit screw according to Embodiment 1 of this utility model;

[0023] Figure 2 This is a partial enlarged front view of a non-marking high-strength press-fit screw as described in Embodiment 1 of this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of a non-marking high-strength press-fit screw according to Embodiment 2 of this utility model;

[0025] Wherein: 1. Stud; 11. First chamfer; 12. Second chamfer;

[0026] 2. Head; 21. Teeth;

[0027] 3. Extrusion component; 31. Annular protrusion; 32. Annular recess. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments:

[0029] To facilitate understanding, the application scenario of this application will be explained first. A press-fit screw generally consists of two parts: a stud 1 and a head 2. The outer wall of the head 2 of a traditional press-fit screw is vertical, which leaves a mark after embedding and makes it impossible to achieve a markless embedding. Therefore, this application improves the head 2 to achieve a markless embedding of the press-fit screw.

[0030] Example 1

[0031] like Figures 1-2 As shown, a non-marking high-strength press-fit screw includes a stud 1 and a head 2 arranged coaxially, wherein the radial dimension of the head 2 is larger than the radial dimension of the stud 1.

[0032] Combination Figure 2 As shown, the outer wall surface of the head 2 is inclined. Regarding the direction of inclination, in the pressing direction of the head 2, the outer wall surface gradually inclinates towards the side closer to the central axis. That is, the distance between the end of the head 2 closest to the stud 1 and the central axis is less than the distance between the end of the head 2 furthest from the stud 1 and the central axis. In this embodiment, the inclination angle of the outer wall surface of the head 2 is 3-5°. Figure 2 The angle α in the middle ensures that the rivet screw is embedded without leaving a mark during the pressing process, thus ensuring aesthetics; at the same time, compared with the vertical outer wall, the inclined outer wall can make the stress distribution more uniform, the force transmission during rivet is more uniform, and the stress concentration phenomenon at the contact part between the head 2 and the connected part is reduced.

[0033] Because the outer wall of the head 2 is inclined, in this embodiment, the head 2 is configured as a frustum-shaped structure, and uniformly distributed serrations 21 are constructed on the outer wall of the head 2. The serrations 21 are distributed in a ring array around the periphery of the frustum-shaped structure. The presence of the serrations 21 allows the rivet screw to be fully embedded, increases the friction and engagement force between the rivet screw and the connected parts, effectively prevents the screw from loosening under conditions such as vibration and impact, and improves the connection strength.

[0034] After the serrations 21 are formed, the tip of each tooth of the serrations 21 is arc-shaped. Since the outer wall of the head 2 is inclined, the arc width of the tip of each tooth gradually increases in the pressing direction of the head 2.

[0035] An extrusion member 3 is also provided between the stud 1 and the head 2; the extrusion member 3 includes an annular protrusion 31 near one end of the stud 1 and an annular recess 32 near one end of the head 2. The stud 1, the annular protrusion 31, the annular recess 32 and the head 2 are constructed as a single unit, which improves the structural strength and enhances the stability. At the same time, the single unit structure improves the corrosion resistance. Furthermore, a rust-proof layer can be formed on the outside of the single unit structure, which can also effectively prevent structural corrosion.

[0036] Both the annular protrusion 31 and the annular recess 32 are coaxially arranged with the stud 1 and the head 2. The outer diameter of the annular protrusion 31 is larger than the major diameter of the stud 1, but smaller than the radial dimension of the head 2. The outer diameter of the annular recess 32 is smaller than the major diameter of the stud 1. This causes the workpiece between the stud 1 and the head 2 to be compressed and deformed during the insertion of the press-fit screw, and to be embedded in the annular recess 32, preventing the workpiece from warping upwards. At the same time, it can prevent the screw from loosening axially, ensuring the connection is tight.

[0037] The end of the stud 1 away from the head 2 is also provided with a first chamfer 11. The first chamfer 11 makes it easier to insert the press-fit screw into the pre-machined mounting hole and can prevent stress concentration, avoiding stress concentration at the sharp edge of the stud 1 root.

[0038] As a further optimization, in this embodiment, an arc-shaped second chamfer 12 is provided between the annular recess 32 and the head 2, and between the annular recess 32 and the annular protrusion 31. After the rivet screw is embedded, the smooth second chamfer 12 can make the joint between the parts tighter and increase the push-pull force between the workpieces. If the second chamfer 12 is not provided, stress concentration is likely to occur at the right angle position of the transition, which can easily lead to breakage when subjected to external force. By adding the second chamfer 12, the stress is dispersed, the degree of stress concentration is reduced, and breakage is avoided, thereby increasing the push-pull force.

[0039] Example 2

[0040] like Figure 3 As shown, a non-marking high-strength press-fit screw includes a stud 1 and a head 2 arranged coaxially. The outer wall of the stud 1 is provided with a threaded groove, and any radial dimension of the head 2 is greater than the radial dimension of the stud 1.

[0041] In this embodiment, the outer contour of the head 2 along any cross-section perpendicular to the central axis is constructed as a polygonal structure, with a hexagon as an example; of course, in other embodiments, other numbers of polygonal structures may also be used. Since the outer wall surface of the head 2 is inclined, the head 2 is configured as a polygonal frustum structure. Similarly, in this embodiment, the inclination angle of the outer wall surface of the head 2 is also 3-5°.

[0042] The facets of the polygonal frustum are evenly distributed with serrations 21. After the serrations 21 are formed, the tip of each tooth of the serration 21 is flat, and the straight width of the tip of each tooth gradually increases in the pressing direction of the head 2.

[0043] In this embodiment, a pressing member 3 is also provided between the stud 1 and the head 2; the pressing member 3 includes an annular protrusion 31 near one end of the stud 1 and an annular recess 32 near one end of the head 2. The stud 1, the annular protrusion 31, the annular recess 32, and the head 2 are constructed as an integral structure. Both the annular protrusion 31 and the annular recess 32 are coaxially arranged with the stud 1. The outer diameter of the annular protrusion 31 is larger than the major diameter of the stud 1, but smaller than any radial dimension of the head 2; the outer diameter of the annular recess 32 is smaller than the major diameter of the stud 1.

[0044] Similarly, in this embodiment, the end of the stud 1 furthest from the head 2 is also provided with a first chamfer 11. The first chamfer 11 makes it easier for the press-fit screw to be inserted into the pre-machined mounting hole and can prevent stress concentration, avoiding stress concentration at the sharp edge of the stud 1 root. An arc-shaped second chamfer 12 is provided between the annular recess 32 and the head 2, and between the annular recess 32 and the annular protrusion 31, to prevent breakage and increase the pushing and pulling force.

[0045] In summary, this application mainly improves the seamless embedding of the rivet screw by designing the head 2 as an inclined structure along a set direction. This results in a more seamless and aesthetically pleasing embedding of the rivet screw compared to the traditional vertical head. At the same time, the stress distribution is more uniform, and the force transmission is also more uniform. The structure of the rivet screw head 2 can be circular or hexagonal, and of course, it is not limited to other structural shapes in other embodiments.

[0046] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A non-marking high-strength press-fit screw, comprising a stud (1) and a head (2) coaxially arranged, characterized in that, The outer wall of the head (2) is inclined, and in the pressing direction of the head (2), the outer wall gradually tilts towards the side closer to the central axis.

2. The non-marking high-strength press-fit screw according to claim 1, characterized in that: The outer wall of the head (2) is tilted at an angle of 3-5°.

3. The non-marking high-strength press-fit screw according to claim 2, characterized in that: The outer wall of the head (2) has evenly distributed serrations (21).

4. The non-marking high-strength press-fit screw according to claim 3, characterized in that: The head (2) is configured as a frustum structure, and the flower teeth (21) are arranged in a ring array around the frustum structure.

5. The non-marking high-strength press-fit screw according to claim 4, characterized in that: The tip of each tooth of the flower tooth (21) is arc-shaped, and the width of the arc at the tip of each tooth gradually increases in the pressing direction of the head (2).

6. The non-marking high-strength press-fit screw according to claim 3, characterized in that: The head (2) is configured as a polygonal frustum structure, and the flower teeth (21) are evenly distributed on each end face of the polygonal frustum.

7. The non-marking high-strength press-fit screw according to claim 6, characterized in that: The tip of each tooth of the flower tooth (21) is planar, and the straight width of the tip of each tooth gradually increases in the pressing direction of the head (2).

8. The non-marking high-strength press-fit screw according to claim 1, characterized in that: A pressing member (3) is also provided between the stud (1) and the head (2); the pressing member (3) includes an annular protrusion (31) near one end of the stud (1) and an annular recess (32) near one end of the head (2).

9. A non-marking high-strength press-fit screw according to claim 8, characterized in that: The stud (1), the annular protrusion (31), the annular recess (32) and the head (2) are constructed as an integral structure; the outer diameter of the annular protrusion (31) is larger than the major diameter of the stud (1), and the outer diameter of the annular recess (32) is smaller than the major diameter of the stud (1).

10. A non-marking high-strength press-fit screw according to claim 8, characterized in that: A second chamfer (12) in an arc shape is provided between the annular recess (32) and the head (2), and between the annular recess (32) and the annular protrusion (31).

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