CN118934813A - Countersunk rivet nut and connection system - Google Patents

Abstract

The invention provides a countersunk head blind rivet nut and a connecting system, wherein the countersunk head blind rivet nut is used for riveting a workpiece and comprises a head flange and a rod part connected to one end of the head flange; wherein, the outer wall of the rod part is provided with a plurality of first anti-slip teeth along the circumferential direction; the end face of the head flange, which faces the rod part, is a countersunk wedge surface, and a plurality of second anti-slip teeth are arranged on the countersunk wedge surface along the circumferential direction of the countersunk wedge surface; the second anti-skid teeth are connected or disconnected with the first anti-skid teeth in a one-to-one correspondence manner; when workpieces are riveted, the rod part can be outwards expanded to form riveting expansion protrusions to be matched with the countersunk wedge surface of the head flange to clamp the workpieces, and the first anti-slip teeth and the second anti-slip teeth can be mutually embedded with the workpieces. The countersunk head blind rivet nut provided by the invention optimizes the countersunk head wedge surface structure, and can greatly improve the self-rotation torque performance.

Description

Countersunk head rivet nut and connecting system

Technical Field

The invention belongs to the technical field of fasteners, and particularly relates to a countersunk head blind rivet nut and a connecting system.

Background

The blind rivet nut can be single-sided blind rivet, is simple to operate, provides threaded mounting points for various plates and profiles, and is widely applied to the fields of automobiles, aviation, railways, refrigeration, elevators, switches, instruments, furniture, decoration and the like. According to the head type, the rivet nut can be divided into six types of countersunk heads and flat heads. However, in the installation cooperation with the workpiece, the head flange of the flat head rivet nut forms a circular cake-shaped bulge on the workpiece to influence the cooperation and the appearance of the workpiece, while the head flange of the flat head rivet nut is a narrow-side countersunk head shape which can be sunk into a prefabricated countersink of the workpiece, the bulge is formed on the workpiece after the assembly, the size of the bulge is extremely small, and the surface of the workpiece is almost flat, so that the workpiece is more tightly matched and attractive with other workpieces.

According to the structure of the rivet body (rod part), the rivet nut can be divided into a hexagon and a circle, wherein the hexagon rivet nut has natural rotation preventing performance relative to the round rivet nut, and is more favored by designers, but in some application occasions, the round rivet nut is required to be used, so that the round rivet nut has rotation preventing performance, generally, strip-shaped flower teeth are arranged on the outer wall of the rivet body structure along the axial direction, so that after the rivet body structure forms a rivet expansion bulge due to the rivet action and clamps a workpiece with a head flange along the axial direction, the strip-shaped flower teeth are mutually embedded with the end surface of the workpiece along the axial direction deviating from the head flange, and the rivet nut and the workpiece are not easy to slide relatively in the circumferential direction in the process of fastening a matched bolt and the nut, so that the torque is improved. However, the head flange of the countersunk head blind rivet nut is relatively narrow, so that the contact area between the countersunk head blind rivet nut and a workpiece in the axial direction is small, and therefore, the torque improvement is limited; and the surface of the nut is conventionally provided with a plating layer, and compared with a cold heading piece, the surface of the nut is smoother, but the friction coefficient is reduced, so that the rotation torque value of the nut is attenuated to different degrees.

Disclosure of Invention

In view of the above-mentioned problems in the prior art, a main object of the present invention is to provide a countersunk head blind rivet nut and a connecting system, in which the countersunk head blind rivet nut is provided with an optimized countersunk head wedge surface structure, and the self-rotation torque performance can be improved to a greater extent.

The aim of the invention is achieved by the following technical scheme:

The invention provides a countersunk head blind rivet nut which is used for riveting a workpiece and comprises a head flange and a rod part connected to one end of the head flange; wherein,

The outer wall of the rod part is provided with a plurality of first anti-slip teeth along the circumferential direction of the outer wall;

The end face of the head flange, which faces the rod part, is a countersunk wedge surface, and a plurality of second anti-slip teeth are arranged on the countersunk wedge surface along the circumferential direction of the countersunk wedge surface; the second anti-skid teeth are connected or disconnected with the first anti-skid teeth in a one-to-one correspondence manner;

When workpieces are riveted, the rod part can be outwards expanded to form riveting expansion protrusions to be matched with the countersunk wedge surface of the head flange to clamp the workpieces, and the first anti-slip teeth and the second anti-slip teeth can be mutually embedded with the workpieces.

As a further description of the above aspects, the stem includes an expansion section and a threaded section, the expansion section being connected between the head flange and the threaded section;

The first anti-slip teeth are arranged on the outer wall of the expansion section;

The expansion section can be outwards expanded to form a riveting expansion bulge when the countersunk head rivet nut rivets the workpiece, and the riveting expansion bulge and the head flange can axially clamp the workpiece.

As a further description of the above technical solution, the outer diameter of the expansion section is the same as the outer diameter of the threaded section and is smaller than the outer diameter of the head flange.

According to the technical scheme, through holes are formed in the countersunk head rivet nut in the axial direction, the through holes at least comprise first section holes and second section holes which are coaxially arranged, the first section holes are closer to one end, deviating from the threaded section, of the head flange than the second section holes, the aperture of each first section hole is larger than that of each second section hole, and internal threads are formed in the inner side wall of each second section hole.

As a further description of the above technical solution, the first section hole is axially disposed in the head flange and the expansion section;

The second section hole is axially arranged in the threaded section.

As further description of the technical scheme, the head flange and the rod part of the countersunk head blind rivet nut are integrally connected.

As a further description of the above technical solution, the number of the first anti-slip teeth and the second anti-slip teeth is 36.

As a further description of the above technical solution, the first anti-slip teeth and the second anti-slip teeth are all equidistantly distributed along the circumference of the countersunk head blind rivet nut.

The present invention also provides a connection system comprising:

the workpiece is provided with a slotted hole;

The expansion part of the countersunk head blind rivet nut is in interference fit with the part connected with the head flange in the slotted hole of the workpiece; the part of the expansion part connected with the thread section is expanded outwards under the action of tensile force to form a riveting expansion bulge, and the riveting expansion bulge and the head flange are matched to clamp the workpiece;

the structure body is detachably connected in the through hole of the countersunk head blind rivet nut.

As a further description of the above technical solution, the end face of the riveting expansion protrusion facing the workpiece is provided with a plurality of first anti-slip teeth, the countersunk wedge face of the head flange facing the workpiece is provided with a plurality of second anti-slip teeth,

The first anti-slip teeth and the second anti-slip teeth are mutually embedded with the workpiece.

By the technical scheme, the invention has the outstanding effects that:

The countersunk head blind rivet nut comprises a head flange and a rod part connected to one end of the head flange, wherein a plurality of first anti-slip teeth are arranged on a countersunk head wedge surface of the head flange, which faces the rod part, in the circumferential direction, and are in one-to-one correspondence with or disconnected from a plurality of first anti-slip teeth originally arranged on the outer wall of the rod part along the circumferential direction, when the countersunk head blind rivet nut is used for riveting a workpiece, the countersunk head blind rivet nut can be used for riveting the workpiece by means of a blind rivet tool (such as a blind rivet gun) in the same installation mode as other countersunk head blind rivet nuts, so that after the rod part passes through the workpiece, the rod part is outwards expanded to form a riveting expansion protrusion to be matched with a countersunk head wedge surface of the head flange for clamping the workpiece, and as a plurality of second anti-slip teeth which are in one-to-one correspondence with or disconnected with the first anti-slip teeth on the outer part of the rod part are arranged along the circumferential direction, and when the workpiece is matched and clamped by the riveting expansion protrusion, part materials of the workpiece not only flow into gaps of the first anti-slip teeth, so that the workpiece and the first anti-slip teeth are mutually embedded with the second anti-slip teeth, and the second anti-slip teeth can simultaneously mutually embedded. Therefore, the countersunk head blind rivet nut improves the self-rotation torque performance to a greater extent, can maintain the fastening connection effect with the workpiece more stably after being riveted with the workpiece, and is not easy to slide relative to the workpiece in the circumferential direction.

Drawings

FIG. 1 is an axial half cross-sectional view of a countersunk blind rivet nut, in accordance with an embodiment of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a bottom view of a countersunk blind rivet nut, according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a connection system according to an embodiment of the present invention;

Fig. 5 is an enlarged view at B in fig. 4.

Reference numerals illustrate:

1. Countersunk head rivet nut; 11. a head flange; 111. a countersunk wedge surface; 12. a stem portion; 121. an expansion section; 122. a threaded section; 13. a through hole; 131. a first section of aperture; 132. a second section of hole; 2. a workpiece; 21. a slot hole; 3. a first anti-slip tooth; 4. a second anti-slip tooth; 5. riveting the expansion bulge; 6. and (5) an internal thread.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "middle", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or component to be referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present invention will be described in terms of its overall structure.

Referring to fig. 1 to 5, the invention discloses a countersunk head blind rivet nut 1 and a connecting system, wherein the countersunk head blind rivet nut 1 is used for riveting a workpiece 2 and comprises a head flange 11 and a rod part 12 connected with one end of the head flange 11; wherein,

The outer wall of the rod part 12 is provided with a plurality of first anti-slip teeth 3 along the circumferential direction;

The end surface of the head flange 11 facing the rod part 12 is a countersunk wedge surface 111, and a plurality of second anti-slip teeth 4 are arranged on the countersunk wedge surface 111 along the circumferential direction; the second anti-skid teeth 4 are connected or disconnected with the first anti-skid teeth 3 in a one-to-one correspondence;

when the workpiece 2 is riveted, the rod part 12 can be outwards expanded to form a riveting expansion protrusion 5 to be matched with the countersunk wedge surface 111 of the head flange 11 to clamp the workpiece 2, and the first anti-slip teeth 3 and the second anti-slip teeth 4 can be mutually embedded with the workpiece 2.

With the above structure, when the countersunk head blind rivet nut 1 is used for riveting the workpiece 2, as in the installation mode of other countersunk head blind rivet nuts 1, by means of a blind rivet tool (for example, a blind rivet gun), after the rod portion 12 of the blind rivet nut passes through the workpiece 2, the rod portion 12 is expanded outwards to form a riveting expansion protrusion 5 to be matched with the countersunk wedge surface 111 of the head flange 11 to clamp the workpiece 2, and a plurality of second anti-slip teeth 4 which are connected or disconnected with the first anti-slip teeth 3 on the outer part of the rod portion 12 in a one-to-one correspondence manner are arranged on the countersunk wedge surface 111 along the circumferential direction of the countersunk wedge surface 111, so that when the workpiece 2 is matched and clamped by the riveting expansion protrusion 5 and the countersunk wedge surface 111, part of the material of the workpiece 2 flows into the gaps between the first anti-slip teeth 3 and the workpiece 2, and the first anti-slip teeth 3 are mutually embedded, and also flows into the gaps between the second anti-slip teeth 4 and the second anti-slip teeth 4. Therefore, the countersunk head blind rivet nut 1 improves the self-rotation torque performance to a greater extent, and after the countersunk head blind rivet nut is riveted with the workpiece 2, the problem that the head flange 11 of the countersunk head blind rivet nut 1 is narrower can be overcome, the fastening connection effect between the countersunk head blind rivet nut and the workpiece 2 is maintained more stably, and the countersunk head blind rivet nut is not easy to slide relative to the workpiece 2 in the circumferential direction.

Referring to fig. 1 and fig. 4 to 5, in particular, in this embodiment, the stem 12 includes an expansion section 121 and a threaded section 122, and the expansion section 121 is connected between the head flange 11 at an upper end thereof and the threaded section 122 at a lower end thereof; the first anti-slip teeth 3 are arranged on the outer wall of the expansion section 121; the expansion section 121 can be expanded outwards to form a riveting expansion protrusion 5 when the countersunk head blind rivet nut 1 rivets the workpiece 2, the riveting expansion protrusion 5 and the head flange 11 can axially clamp the workpiece 2, the first anti-slip teeth 3 and the expansion section 121 can be partially deformed in the riveting action process, and finally the part of the first anti-slip teeth, which is positioned on the end face of the riveting expansion protrusion 5, facing upwards towards the workpiece 2, can be mutually embedded with the workpiece 2 to ensure that enough torque exists after the countersunk head blind rivet nut 1 and the workpiece 2 are riveted.

Specifically, in this embodiment, the outer diameter of the expansion section 121 and the outer diameter of the thread section 122 are the same and smaller than the outer diameter of the head flange 11.

Specifically, in this embodiment, the countersunk blind rivet nut 1 is provided with a through hole 13 along an axial direction, the through hole 13 includes at least a first section hole 131 and a second section hole 132 that are coaxially disposed, the first section hole 131 is closer to the upper end of the head flange 11, which is away from the threaded section 122, than the second section hole 132, the aperture of the first section hole 131 is greater than that of the second section hole 132, and an internal thread 6 is formed on the inner side wall of the second section hole 132, so that a structure body (not shown in the drawing) adapted to the through hole is mounted in the through hole, for example, an external hexagonal bolt. More specifically, in this embodiment, the first section hole 131 is axially disposed in the head flange 11 and the expansion section 121; the second section bore 132 is axially disposed within the threaded section 122.

Specifically, in this embodiment, the head flange 11 and the stem 12 of the countersunk head blind rivet nut 1 are integrally connected, and the female screw 6 on the inner sidewall of the second section hole 132 may be directly formed by cold heading and then tapping. It should be understood that the first anti-slip tooth 3 and the second anti-slip tooth 4 may be directly formed in the cold heading step, and compared with the arrangement of the anti-slip ribs, the second anti-slip tooth 4 has smaller protruding volume, and the head flange 11 of the second anti-slip tooth may not protrude out of the workpiece 2 obviously after the countersunk blind rivet nut 1 is riveted with the workpiece 2, and may be embedded with the workpiece 2 to perform a good anti-slip function, so that the forming is easier and the material used is less.

Specifically, in this embodiment, the number of the first anti-slip teeth 3 and the second anti-slip teeth 4 is 36. Of course, in other embodiments, the first anti-slip teeth 3 and the second anti-slip teeth 4 may be set to other numbers according to the thickness specification of the countersunk head blind rivet nut 1.

Referring to fig. 1 to 3, in particular, in this embodiment, the first anti-slip teeth 3 and the second anti-slip teeth 4 are all equidistantly distributed along the circumferential direction of the countersunk head blind rivet nut 1, so that a portion of the material of the workpiece 2 can uniformly flow into the gaps between the first anti-slip teeth 3 and the second anti-slip teeth 4 and be tightly engaged with the countersunk head blind rivet nut 1.

Referring to fig. 4 and 5, specifically, the connecting system disclosed in the present invention includes a workpiece 2, a countersunk blind rivet nut 1 as described above, and a structural body, wherein a slot 21 is formed in the workpiece 2; the expansion part of the countersunk head blind rivet nut 1 is in interference fit with the part connected with the head flange 11 in the slotted hole 21 of the workpiece 2; the part of the expansion part connected with the thread section 122 expands outwards under the action of tension to form a riveting expansion protrusion 5, and the riveting expansion protrusion 5 and the head flange 11 are matched to clamp the workpiece 2; the structure is detachably connected in the through hole 13 of the countersunk head blind rivet nut 1, and the structure is selected as an outer hexagon bolt. Of course, in other embodiments, other rivet structures that can be detachably connected to the through hole 13 of the countersunk head rivet nut 1 may be selected according to actual needs.

Specifically, in this embodiment, the end surface of the riveting expansion protrusion 5 facing the workpiece 2 is provided with a plurality of first anti-slip teeth 3, the countersunk wedge surface 111 of the head flange 11 facing the workpiece 2 is provided with a plurality of second anti-slip teeth 4, and the first anti-slip teeth 3 and the second anti-slip teeth 4 are all engaged with the workpiece 2, so that the countersunk blind rivet nut 1 cannot rotate relative to the workpiece 2 in the process of detachably connecting the structure body and the countersunk blind rivet nut 1. It should be understood that the first plurality of non-slip teeth 3 provided on the end surface of the rivet expansion protrusion 5 facing the workpiece 2 is also deformed to some extent (i.e., expanded to some extent outwardly in synchronization with the formation of the rivet expansion protrusion 5) compared to before the rivet expansion protrusion 5 is formed.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any changes, equivalents, modifications and improvements may be made without departing from the spirit and principles of the present invention.

Claims (10)

1. A countersunk rivet nut, used for riveting workpieces, characterized in that it comprises a head flange and a rod connected to one end of the head flange; wherein: The outer wall of the rod portion is provided with a plurality of first anti-slip teeth along its circumference; The end surface of the head flange facing the rod portion is a countersunk wedge surface, and the countersunk wedge surface is provided with a plurality of second anti-skid teeth along its circumference; the second anti-skid teeth are connected or disconnected with the first anti-skid teeth in a one-to-one correspondence; When riveting workpieces, the rod portion can expand outward to form a riveting expansion protrusion to cooperate with the countersunk wedge surface of the head flange to clamp the workpiece, and the first anti-slip teeth and the second anti-slip teeth can be interlocked with the workpiece. 2. The countersunk rivet nut according to claim 1, characterized in that the stem portion comprises an expansion section and a threaded section, and the expansion section is connected between the head flange and the threaded section; The first anti-slip teeth are arranged on the outer wall of the expansion section; The expansion section can expand outwards to form a riveting expansion protrusion when the countersunk rivet nut is riveted to the workpiece, and the riveting expansion protrusion can clamp the workpiece axially with the head flange. 3. The countersunk rivet nut according to claim 2, characterized in that the outer diameter of the expansion section is the same as the outer diameter of the threaded section and is smaller than the outer diameter of the head flange. 4. The countersunk rivet nut according to claim 2 is characterized in that a through hole is opened in the axial direction, and the through hole comprises at least a first section hole and a second section hole which are coaxially arranged, the first section hole is closer to the end of the head flange away from the threaded section than the second section hole, the aperture of the first section hole is larger than the aperture of the second section hole, and an internal thread is formed on the inner side wall of the second section hole. 5. The countersunk rivet nut according to claim 4, characterized in that the first section hole is axially arranged in the head flange and the expansion section; The second section hole is axially arranged inside the threaded section. 6. The countersunk rivet nut according to claim 1, characterized in that the head flange and the stem of the countersunk rivet nut are connected in an integrated manner. 7. The countersunk rivet nut according to claim 1, characterized in that the number of the first anti-slip teeth and the number of the second anti-slip teeth are both 36. 8. The countersunk rivet nut according to claim 1, characterized in that the first anti-slip teeth and the second anti-slip teeth are equidistantly distributed along the circumference of the countersunk rivet nut. 9. A connection system, characterized in that the connection system comprises: A workpiece, wherein a slot is formed on the workpiece; The countersunk rivet nut according to any one of claims 1 to 8, wherein the portion where the expansion portion is connected to the head flange is interference-fitted in the slot of the workpiece; the portion where the expansion portion is connected to the threaded section expands outward under the action of tension to form a riveted expansion protrusion, and the riveted expansion protrusion cooperates with the head flange to clamp the workpiece; A structure is detachably connected to the through hole of the countersunk rivet nut. 10. The connection system according to claim 9, characterized in that a plurality of first anti-slip teeth are provided on the end surface of the riveting expansion protrusion facing the workpiece, and a plurality of second anti-slip teeth are provided on the countersunk wedge surface of the head flange facing the workpiece. The first anti-slip teeth and the second anti-slip teeth are both engaged with the workpiece.