Ring groove rivet sleeve and high-strength ring groove rivet for aerospace

Abstract

The invention relates to a ring groove rivet sleeve and a high-strength ring groove rivet for aerospace, the rivet sleeve comprises a bulged section, a connecting section and a locking section which are sequentially distributed in the axial direction, and the material strength of the bulged section and the locking section is smaller than that of the connecting section. According to the rivet sleeve, the bulged section, the connecting section and the locking section are sequentially distributed in the axial direction, the bulged section penetrates through the hole of the connected piece during riveting, the connecting section is located in the hole in the connected piece, the locking section abuts against the side face of the connected piece, the bulged section is bulged and deformed in the riveting process, and the locking section is located in the hole in the connected piece. Meanwhile, the locking section is extruded to deform and is filled into a thread groove in the rod part of the nail rod to realize locking; due to the fact that after riveting is completed, the rivet mainly bears shearing force through the connecting section, the material strength of the connecting section is set to be larger than that of the bulging section and the locking section, smooth deformation of the bulging section and the locking section can be guaranteed, meanwhile, the structural strength of the connecting section is improved, the connecting section has high shearing strength, and the service life of the rivet is prolonged. And the shear resistance of the rivet can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of riveting technology, and particularly relates to a collar for a ring groove rivet and a high-strength ring groove rivet for aerospace applications. Background Art

[0002] A rivet is a widely used fastener for connecting parts, which uses its own deformation or interference fit to connect the parts to be riveted during the riveting process. As a type of blind rivet, the ring groove rivet is widely used in high-end equipment fields such as aerospace. It mainly consists of a collar and a shank. The shank includes a rod portion and a head at one end. A necking groove is provided in the middle of the rod portion, and a thread groove is provided on the rod portion on the side of the necking groove close to the head. During the blind riveting process, one end of the collar is squeezed by the head and bulges and deforms, and the other end of the collar deforms and fills into the thread groove of the remaining section to form a mechanical lock. The rod portion breaks at the necking groove to achieve the purpose of riveting. In order to make the collar deform during installation, the material of the collar is usually selected to be a material with good plasticity but low strength, resulting in the defect that the rivet has weak shear resistance. Summary of the Invention

[0003] Based on the above description, the present invention provides a collar for a ring groove rivet and a high-strength ring groove rivet for aerospace applications to solve the defect that, in order to make the collar deform during installation, the material of the collar is usually selected to be a material with good plasticity but low strength, resulting in the rivet having weak shear resistance.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: In the first aspect, the present application provides a collar for a ring groove rivet, and the technical solution adopted is as follows: A collar for a ring groove rivet includes a bulging section, a connecting section, and a locking section that are axially distributed in sequence, and the material strength of the bulging section and the locking section is less than the material strength of the connecting section.

[0005] Preferably, the materials of the bulging section and the locking section are the same.

[0006] Preferably, the bulging section, the connecting section, and the locking section are separable from each other.

[0007] Preferably, counterbores are provided on both end faces of the connecting section, and limiting platforms adapted to the counterbores are provided at one end of the bulging section close to the connecting section and at one end of the locking section close to the connecting section. When the bulging section, the connecting section, and the locking section are connected, the limiting platforms on the bulging section and the locking section are respectively embedded in the counterbores at both ends of the connecting section to limit the relative radial movement of the bulging section, the connecting section, and the locking section.

[0008] Preferably, the counterbore is a conical counterbore with a diameter decreasing from the end face where it is located towards the other end face along the axial direction of the connecting section, and the limiting platform is in the shape of a frustum of a cone adapted to the counterbore.

[0009] Preferably, the counterbore is formed by chamfering along the inner edge of the end face of the connecting section, and the chamfering angle is 20 - 50°.

[0010] Preferably, the bulging section and the connecting section have the same outer diameter and are smaller than the outer diameter of the locking section.

[0011] In a second aspect, the present application provides a high-strength ring groove rivet for aerospace, which includes the ring groove rivet sleeve and the nail rod described above. The ring groove rivet sleeve is sleeved outside the rod part of the nail rod, and the bulging section is close to the head of the nail rod.

[0012] Preferably, the bulging section is in clearance fit with the rod part, and both the connecting section and the locking section are in interference fit with the rod part.

[0013] Preferably, a vertical tooth section is provided on the rod part on the side of the neck-breaking groove away from the head. A plurality of vertical teeth extending along the axial direction of the rod part are provided on the vertical tooth section, and the plurality of vertical teeth are spaced apart circumferentially along the rod part. The locking section is in interference fit with the vertical tooth section.

[0014] Preferably, a guiding groove surrounding the rod part is provided on the end face of the head of the nail rod close to one end of the rod part. The guiding groove has a diameter decreasing from the end face of the head where it is located towards the other end face along the axial direction of the rod part.

[0015] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. The nail sleeve of the present application is provided with a bulging section, a connecting section, and a locking section sequentially distributed along the axial direction. During riveting, the bulging section passes through the hole of the workpiece to be connected, the connecting section is located in the hole on the workpiece to be connected, and the locking section abuts against the side of the workpiece to be connected. During the riveting process, the bulging section bulges and deforms, and at the same time, the locking section is squeezed and deformed and filled into the thread groove on the rod part of the nail rod to achieve locking. Since after riveting is completed, the rivet mainly bears the shear force by the connecting section, by setting the material strength of the connecting section to be greater than the material strengths of the bulging section and the locking section, while ensuring the smooth deformation of the bulging section and the locking section, the structural strength of the connecting section can be improved, so that the connecting section has a high shear strength, and the shear resistance of the rivet can be effectively improved.

[0016] 2. By setting the bulging section, the connecting section, and the locking section to be separable from each other, they can be processed separately and then assembled to the nail rod in sequence during processing. There is no need to perform connection processing such as welding between different materials, and the processing is convenient.

[0017] 3. In this application, counterbores are provided on both end faces of the connecting section, and limiting platforms adapted to the counterbores are provided on the bulging section and the locking section. When the bulging section, the connecting section, and the locking section are connected, the limiting platforms on the bulging section and the locking section are respectively embedded in the counterbores at both ends of the connecting section, so as to limit the relative radial movement of the bulging section, the connecting section, and the locking section through the cooperation of the limiting platforms and the counterbores, thereby forming a nail sleeve with a stable structure.

[0018] 4. In this application, the counterbore is set as a tapered counterbore, and correspondingly, the limiting platform is designed to be frustum-shaped. On the one hand, the cooperation of the tapered counterbore and the frustum-shaped limiting platform enables the bulging section, the connecting section, and the locking section to automatically align and form a coaxial connection. On the other hand, during riveting, due to the huge axial tensile force generated by the nail rod, a conical penetration effect is generated on the bulging section and the locking section into the tapered counterbore of the connecting section, and the connecting section expands in the diameter direction at both ends, so that the connecting section forms a high interference state with the plates to be connected. That is to say, the diameter expansion at both ends of the connecting section generates an interference pressing effect on the hole walls of the two plates to be connected, which will greatly improve the shear resistance and anti-vibration ability of the riveted connection and significantly improve the anti-fatigue performance of the riveting. Moreover, when the bulging section is squeezed and deformed, the limiting platform at its end is restricted in the counterbore, so that the end of the bulging section is not easily deformed outward, thereby ensuring that the middle of the bulging section bulges outward to complete the riveting; the limiting platform of the locking section is restricted in the counterbore, and similarly, the end of the locking section close to the connecting section is restricted from deforming outward. Under the extrusion cooperation of the riveting tool, it is ensured that the locking section contracts inward and deforms to fill the thread groove of the nail rod to form a mechanical lock, thereby completing the riveting. That is, the cooperation of the tapered counterbore and the adapted limiting platform can ensure that the bulging section and the locking section deform in a set manner to form a good riveting effect, and the connecting section forms a high interference state with the plates to be connected to improve the shear resistance and anti-vibration ability of the riveted connection and significantly improve the anti-fatigue performance of the riveting.

[0019] 5. The high-strength ring groove rivet of this application uses a nail sleeve formed by a bulging section, a connecting section, and a locking section. By setting the material strength of the connecting section to be greater than that of the bulging section and the locking section, while ensuring the smooth deformation of the bulging section and the locking section, the structural strength of the connecting section can be improved, so that the connecting section has a high shear strength and can effectively improve the shear resistance of the rivet.

[0020] 6. The high-strength ring groove rivet of this application is provided with a vertical tooth section and is in interference fit with the locking section of the nail sleeve, so that the nail sleeve and the nail rod are stably and reliably connected to avoid the parts falling off during transportation and use.

[0021] 7. In this application, through the guiding groove on the end face of the nail rod head, the guiding groove can play a role in guiding the end of the bulging section close to the head to contract inward, and under the combined limiting effect of the bottom limiting platform of the bulging section and the counterbore on the end face of the connecting section, both ends of the bulging section are kept tightened and deformed by bulging from the middle, that is, the bulging section deforms in a designed manner to complete the riveting. Brief Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a high-strength ring groove rivet for aerospace provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the nail rod in the high-strength ring groove rivet for aerospace provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the completed riveting state of the high-strength ring groove rivet for aerospace provided by an embodiment of the present invention; Figure 4 It is an exploded schematic diagram of the ring groove rivet sleeve in the high-strength ring groove rivet for aerospace provided by an embodiment of the present invention; Figure 5 It is a schematic diagram of the head structure of the nail rod in the high-strength ring groove rivet for aerospace provided by an embodiment of the present invention.

[0023] Description of the reference numerals: 1, nail rod; 11, head; 111, guiding groove; 12, rod part; 121, neck-breaking groove; 122, thread groove; 123, vertical tooth section; 1231, vertical tooth; 2, nail sleeve; 21, bulging section; 22, connecting section; 221, counterbore; 23, locking section; 24, limiting platform. Detailed Embodiments

[0024] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0026] It will be understood that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the attached drawings is flipped, an element or feature described as "under other elements" or "beneath them" or "underneath them" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. In addition, the device may also have additional orientations (such as being rotated 90 degrees or other orientations), and the spatial descriptors used herein are to be interpreted accordingly.

[0027] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is a transfer of electrical signals or data between the connected circuits, modules, units, etc., should be understood as "electrically connected", "communicatively connected", etc.

[0028] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0029] Referring to Figures 1-5 as shown, an embodiment of the present application provides a high-strength ring groove rivet for aerospace, which includes a ring groove rivet sleeve 2 and a nail rod 1.

[0030] Referring to Figures 1-2 as shown, wherein, the nail rod 1 includes a rod portion 12 and a head 11 connected to one end. A neck-breaking groove 121 is provided on the outer wall of the middle part of the rod portion 12. A threaded groove 122 is provided on the rod portion 12 on the side of the neck-breaking groove 121 close to the head 11. And a thread for cooperating with a riveting tool is provided on the part of the rod portion 12 between the end far from the head 11 and the neck-breaking groove 121.

[0031] Referring to Figure 1As shown, the nail sleeve 2 is coaxially sleeved outside the rod portion 12 of the nail rod 1 and one end abuts against the head portion 11. Specifically, the nail sleeve 2 includes a bulging section 21, a connecting section 22, and a locking section 23 that are axially distributed in sequence. The material strength of the bulging section 21 and the locking section 23 is less than that of the connecting section 22. Among them, when the nail sleeve 2 is sleeved outside the rod portion 12, the bulging section 21 is close to the head portion 11, and the neck-breaking groove 121 of the rod portion 12 is located within the locking section 23. When designing, the inner diameter of the nail sleeve 2 needs to be less than the diameter of the head portion 11, and the diameter of the locking section 23 is greater than the outer diameters of the bulging section 21 and the connecting section 22. Moreover, one end of the locking section 23 away from the connecting section 22 is set to have a decreasing outer diameter along the axial direction and away from the connecting section 22, so as to cooperate with the riveting tool to cause the locking section 23 to deform inward and fill into the thread groove 122 of the nail rod 1.

[0032] During riveting, the bulging section 21 passes through the hole of the workpiece to be connected, the connecting section 22 is located within the hole on the workpiece to be connected, and the locking section 23 abuts against the side of the workpiece to be connected. Connect the end of the rod portion 12 away from the head portion 11 to the riveting tool. The riveting tool moves the nail rod 1 towards the side where the nail rod 1 contacts the locking section 23 of the workpiece to be connected. During this process, the bulging section 21 is squeezed by the head portion 11 of the nail rod 1 and bulges and deforms to abut against the side of the workpiece to be connected away from the locking section 23, while the locking section 23 is squeezed by the riveting tool and deforms inward to fill into the thread groove 122 on the rod portion 12 to achieve locking. The nail rod 1 breaks at the neck-breaking groove 121, and the remaining parts of the nail sleeve 2 and the nail rod 1 are retained on the workpiece to be connected to form a riveting. After riveting, as Figure 3 shown. Since after riveting is completed, the rivet mainly bears the shear force by the connecting section 22. By setting the material strength of the connecting section 22 to be greater than that of the bulging section 21 and the locking section 23, while ensuring the smooth deformation of the bulging section 21 and the locking section 23, the structural strength of the connecting section 22 can be improved, enabling the connecting section 22 to have a high shear strength, which can effectively improve the shear resistance of the rivet.

[0033] Among them, the bulging section 21 and the locking section 23 are made of the same material, which needs to have good plasticity to deform smoothly during riveting, such as materials like carbon steel. The material of the connecting section 22 can be selected as a high-strength alloy material such as titanium alloy. Moreover, since the connecting section 22 is in direct contact with the workpiece to be connected, the connecting section 22 can also be selected to be the same material as the workpiece to be connected to reduce the potential difference, thereby avoiding electrochemical corrosion. The nail rod 1 is selected as a high-strength alloy steel material, and the appropriate material can be selected according to actual needs.

[0034] Refer to Figure 1 and Figure 4As shown in the figure, further, the bulging section 21, the connecting section 22, and the locking section 23 are separable from each other. This setting enables the bulging section 21, the connecting section 22, and the locking section 23 to be processed separately and then assembled onto the nail rod 1 in sequence during processing. There is no need to perform connection processing such as welding between different materials, which is convenient for processing. In order to achieve the stability when the bulging section 21, the connecting section 22, and the locking section 23 are connected to each other, counterbores 221 are provided on both end faces of the connecting section 22. Limiting platforms 24 adapted to the counterbores 221 are provided at one end of the bulging section 21 close to the connecting section 22 and at one end of the locking section 23 close to the connecting section 22. When the bulging section 21, the connecting section 22, and the locking section 23 are connected, the limiting platforms 24 on the bulging section 21 and the limiting platforms 24 on the locking section 23 are respectively embedded in the counterbores 221 at both ends of the connecting section 22 to limit the relative radial movement of the bulging section 21, the connecting section 22, and the locking section 23.

[0035] By providing counterbores 221 on both end faces of the connecting section 22, and providing limiting platforms 24 adapted to the counterbores 221 on the bulging section 21 and the locking section 23, when the bulging section 21, the connecting section 22, and the locking section 23 are connected, the limiting platforms 24 on the bulging section 21 and the limiting platforms 24 on the locking section 23 are respectively embedded in the counterbores 221 at both ends of the connecting section 22, thereby restricting the relative radial movement of the bulging section 21, the connecting section 22, and the locking section 23 through the cooperation of the limiting platforms 24 and the counterbores 221 to form a nail sleeve 2 with a stable structure.

[0036] Refer to Figure 4 As shown in the figure, further, the counterbore 221 is designed as a tapered counterbore 221 with a diameter decreasing from the end face where it is located towards the other end face along the axial direction of the connecting section 22, and the limiting platform 24 is in the shape of a frustum of a cone adapted to the counterbore 221. Among them, the counterbore 221 is formed by chamfering the inner edge of the end face of the connecting section 22, and the chamfering angle is 20 - 50°, more specifically 25° - 45°; the limiting platforms 24 on the bulging section 21 and the limiting platforms 24 on the locking section 23 are respectively formed by chamfering the outer edge of their corresponding end faces, and the chamfering angle is the same as the chamfering angle of the counterbore 221.

[0037] During actual riveting, if only the bulging section 21 and the locking section 23 press the two connected plates from both sides of the two connected plates, its shear resistance is determined by the frictional force between the two plates formed by the pressing force. By setting the counterbore 221 as a tapered counterbore 221 and correspondingly designing the limiting platform 24 to be frustum-shaped, on the one hand, the cooperation between the tapered counterbore 221 and the frustum-shaped limiting platform 24 enables the bulging section 21, the connecting section 22, and the locking section 23 to automatically align and form a coaxial connection. On the other hand, during blind riveting, the huge axial tension generated by the rivet rod 1 causes the bulging section 21 and the locking section 23 to produce a conical penetration effect into the tapered counterbore 221 of the connecting section 22, resulting in an expansion in the diameter direction at both ends of the connecting section 22, thereby enabling the connecting section 22 to form a high interference state with the connected plates. That is to say, the diameter expansion at both ends of the connecting section 22 produces an interference pressing effect on the hole walls of the two connected plates. At this time, the shear resistance will be determined by the combined action of the pressing frictional force and the anti-extrusion strength of the interference surface material or the shear strength of the rivet cross-sectional material, and the improvement amplitude of the shear resistance can reach 5 to 7 times. And because it is interference fit, the gap is eliminated, and its seismic and fatigue resistance capabilities are also improved several times compared with the connection with gaps, which will greatly improve the shear and anti-vibration capabilities of the riveted connection and significantly improve the anti-fatigue performance of the riveting. And thirdly, the interference fit between the connecting section 22 and the connected plates forms a connection sealing effect, improving the sealing performance at the riveting point. Moreover, when the bulging section 21 is squeezed and deformed, the end limiting platform 24 thereof is restricted in the counterbore 221, making it difficult for the end of the bulging section 21 to deform outward, thereby ensuring that the middle of the bulging section 21 bulges outward to complete the riveting; at the same time, the limiting platform 24 of the locking section 23 is restricted in the counterbore 221, also making it difficult for the end of the locking section 23 close to the connecting section 22 to deform outward. Under the extrusion and cooperation of the riveting tool, it is ensured that the locking section 23 contracts inward and deforms to fill into the thread groove 122 of the rod part 12 to form a mechanical lock, thereby completing the riveting. That is, the cooperation between the tapered counterbore 221 and the adapted limiting platform 24 can ensure that the bulging section 21 and the locking section 23 deform in a set manner to form a good riveting effect.

[0038] Refer to Figure 5As shown in the figure, further, a guiding groove 111 surrounding the rod portion 12 is provided on the end face of the head portion 11 of the nail rod 1 near one end of the rod portion 12, and the diameter of the guiding groove 111 decreases along the axial direction of the rod portion 12 from the end face of the head portion 11 where it is located towards the other end face. By providing the guiding groove 111 on the end face of the head portion 11 of the nail rod 1, the guiding groove 111 can play a role in guiding the inner contraction of one end of the bulging section 21 close to the head portion 11, and under the combined limiting effect of the limiting platform 24 at the bottom of the bulging section 21 and the counterbore 221 on the end face of the connecting section 22, both ends of the bulging section 21 are kept tightened and bulged and deformed from the middle, that is, the bulging section 21 is deformed in a designed manner to complete the riveting. Among them, the end face of the bulging section 21 close to the head portion 11 can be designed to be in a shape adapted to the guiding groove 111 and embedded in the guiding groove 111, or designed to be a plane perpendicular to its own axis. In this embodiment, the latter is used for illustration.

[0039] Referring to Figure 1 As shown in the figure, further, the inner diameter of the bulging section 21 is set to be slightly larger than the diameter of the rod portion 12 near the head portion 11, so that when the bulging section 21 is connected to the rod portion 12 and abuts against the head portion 11, a clearance fit is formed with the rod portion 12; the inner diameter of the connecting section 22 is set to be slightly smaller than the diameter of the rod portion 12 near the head portion 11, and the connecting section 22 is assembled onto the nail rod 1 to form an interference fit with the rod portion 12. The inner diameter of the locking section 23 is set to be slightly smaller than the inner diameter of the connecting section 22, and on the rod portion 12, a vertical tooth 1231 section 123 is provided on the side of the neck-breaking groove 121 away from the head portion 11, and a plurality of vertical teeth 1231 extending along the axial direction of the nail rod 1 are provided on the vertical tooth 1231 section 123, and the plurality of vertical teeth 1231 are spaced apart circumferentially along the rod portion 12. The locking section 23 is set to have an interference fit with the vertical tooth 1231 section 123.

[0040] Through the above settings, the clearance fit between the bulging section 21 and the rod portion 12 enables both ends of the bulging section 21 to undergo a small amount of inward deformation and contraction, so as to ensure that the bulging section 21 deforms in accordance with the designed deformation mode of bulging outward from the middle to form a stable riveting fixation; the interference fit between the connecting section 22 and the rod portion 12 makes it impossible for the nail rod 1 and the nail sleeve 2 to move relative to each other in the radial direction, ensuring the riveting strength and stability; the interference fit between the locking section 23 and the vertical tooth 1231 section 123 enables the nail sleeve 2 and the nail rod 1 to maintain a stable and reliable connection, so as to improve the structural stability of the ring groove rivet and prevent the components from falling off during transportation and use. The setting of the vertical tooth 1231 section 123 and the vertical teeth 1231 thereon can reduce the contact area between the rod portion 12 and the locking section 23, reduce the moving friction resistance of the part of the rod portion 12 on the side of the neck-breaking groove 121 away from the head portion 11 relative to the locking section 23 during the riveting process, reduce the force required for the riveting operation, and improve the riveting efficiency.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A collar for a ring groove rivet, characterized in that: It includes a bulging section (21), a connecting section (22), and a locking section (23) that are axially distributed in sequence. The material strength of the bulging section (21) and the locking section (23) is less than that of the connecting section (22).

2. The rivet sleeve of the annular groove rivet according to claim 1, characterized in that: The materials of the bulging section (21) and the locking section (23) are the same.

3. The rivet sleeve for annular groove riveting according to claim 1, characterized in that: The bulging section (21), the connecting section (22), and the locking section (23) are separable from each other.

4. The collar of the annular groove rivet according to claim 3, characterized in that: Counterbores (221) are provided at both end faces of the connecting section (22). Limiting platforms (24) adapted to the counterbores (221) are provided at one end of the bulging section (21) close to the connecting section (22) and at one end of the locking section (23) close to the connecting section (22). When the bulging section (21), the connecting section (22), and the locking section (23) are connected, the limiting platforms (24) on the bulging section (21) and the limiting platforms (24) on the locking section (23) are respectively embedded in the counterbores (221) at both ends of the connecting section (22) to limit the relative radial movement of the bulging section (21), the connecting section (22), and the locking section (23).

5. The rivet sleeve for ring groove riveting according to claim 4, characterized in that: The counterbore (221) is a tapered counterbore (221) with a diameter decreasing from the end face where it is located to the other end face along the axial direction of the connecting section (22). The limiting platform (24) is in the shape of a frustum of a cone adapted to the counterbore (221).

6. The rivet sleeve of the annular groove rivet according to claim 5, characterized in that: The counterbore (221) is formed by chamfering along the end face of the connecting section (22), and the chamfering angle is 20 - 50°.

7. The rivet sleeve of the annular groove rivet according to claim 1, wherein: The outer diameters of the bulging section (21) and the connecting section (22) are the same and smaller than the outer diameter of the locking section (23).

8. A high-strength ring groove rivet for aerospace applications, characterized in that, It includes a ring groove rivet sleeve and a nail rod (1) as described in any one of claims 1 - 7. The ring groove rivet sleeve is sleeved outside the rod portion (12) of the nail rod (1), and the bulging section (21) is close to the head (11) of the nail rod (1).

9. The high-strength ring groove rivet for aerospace according to claim 8, wherein: The bulging section (21) has a clearance fit with the rod portion (12), and both the connecting section (22) and the locking section (23) have an interference fit with the rod portion (12).

10. The high-strength grooved rivet for aerospace according to claim 9, characterized in that: On the rod portion (12) on the side of the neck-breaking groove (121) away from the head (11), there is a vertical tooth (1231) section (123). A plurality of vertical teeth (1231) extending along the axial direction of the rod portion (12) are provided on the vertical tooth (1231) section (123). The plurality of vertical teeth (1231) are circumferentially spaced apart along the rod portion (12), and the locking section (23) has an interference fit with the vertical tooth (1231) section (123).

11. The high-strength annular groove rivet for aerospace according to claim 8, characterized in that: On the end face of the head (11) of the nail rod (1) close to the rod portion (12), a guiding groove (111) surrounding the rod portion (12) is provided. The guiding groove (111) has a diameter decreasing from the end face of the head (11) where it is located to the other end face along the axial direction of the rod portion (12).

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