CN113606243A

CN113606243A - Extrusion deformation fastener and assembling method thereof

Info

Publication number: CN113606243A
Application number: CN202110862603.2A
Authority: CN
Inventors: 黄鑫; 李迪
Original assignee: Shandong Zhongtian Intelligent Control Technology Co ltd
Current assignee: Yantai Zhongtian Connection Technology Research Institute
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2021-11-05

Abstract

The invention discloses an extrusion deformation fastener and an assembly method thereof, wherein the extrusion deformation fastener comprises a head part and a rod body, wherein the rod body is provided with a smooth surface section and a threaded section; the outer wall of the threaded section is provided with a concave part which is used for forming self-locking by partially extruding the extruded and deformed high lock nut; a pulling and twisting groove is formed in the end face of one side, away from the head, of the threaded section along the axis direction of the rod body, and a plurality of tooth parts are arranged on the inner wall of the pulling and twisting groove at intervals; the outer wall of the threaded section is provided with the concave part, and the high-locking nut is extruded into the concave part after being extruded and deformed by external force to form self-locking with the high-locking nut.

Description

Extrusion deformation fastener and assembling method thereof

Technical Field

The invention belongs to the technical field of high-locking fasteners, and particularly relates to an extrusion deformation fastener and an assembly method thereof.

Background

The high-locking fastener (such as a high-locking bolt) and the high-locking nut are mainly applied to airplane structures, such as connection of airplane splints, airplane cabins, skins and the like, and have self-locking performance. The fastener is generally made up of a bolt head, a threaded rod with a threaded section, starting at the tail of the threaded rod,

when the high-locking nut is used, a mounting hole is drilled at a connecting part, the fastener penetrates through the connecting hole, the high-locking nut is screwed into the fastener until the high-locking nut is contacted with the connecting plate to form a pre-tightening force, and finally, a torque moment capable of twisting off the high-locking nut is loaded, so that the twisting part is broken, and the mounting is completed. The existing high-locking nut and fastener can be installed only by using a torque wrench, the assembly is complex, and the twisting-off torque and the pre-tightening force are difficult to control.

In addition, an inner hexagonal groove is formed in the end face of the tail portion of the screw rod in an extending mode along the axis of the screw rod, the corresponding pulling and screwing tool is provided with a hexagonal conical head matched with the pulling and screwing tool, the screw rod of the fastening piece is inserted into one side of the hole during installation, the nut is screwed on the other side of the hole, the hexagonal conical head of the pulling and screwing tool extends into the inner hexagonal groove of the tail portion of the screw rod, and the pulling and screwing tool is used for limiting the pulling and screwing tool by applying torque to the pulling and screwing tool in use, controlling the fastening piece to be incapable of rotating and rotating the nut until the nut achieves an installation effect.

However, in the actual use process, when the fastener is assembled with the nut, because the designed torque value is large, especially when products with small specifications are assembled with each other, the assembling torque exceeds the limit torque of the inner hexagonal groove of the bolt, so that the phenomenon that the inner hexagonal groove slips and is damaged in the installation process occurs, and the use and assembly requirements cannot be met. In addition, in order to enable the hexagonal wrenching tool to be inserted into the hexagonal groove, a certain fit clearance is required to be reserved between the hexagonal wrenching tool and the hexagonal groove, and the fit clearance easily causes the wrenching tool and the hexagonal groove to be difficult to reach surface contact and to be in large-area contact.

Disclosure of Invention

The present invention overcomes the deficiencies of the prior art by providing an extruded fastener and method of assembling the same.

In order to achieve the above object, the present invention adopts the following technical scheme, and provides an extrusion deformation fastener, which comprises a head and a rod body, wherein the rod body is provided with a smooth surface section and a threaded section; the outer wall of the threaded section is provided with a concave part which is used for forming self-locking by partially extruding the extruded and deformed high lock nut; the end face of one side, away from the head, of the threaded section is provided with a pulling and twisting groove along the axis direction of the rod body, and a plurality of tooth parts are arranged on the inner wall of the pulling and twisting groove at intervals.

Optionally, 6 tooth portions are uniformly arranged on the inner wall of the wrenching groove at intervals along the circumferential direction of the rod body.

Optionally, one end of the tooth part far away from the head part is provided with a chamfer part.

Optionally, the concave portion is arranged along the axial direction of the rod body, the length of the concave portion along the axial direction of the rod body is L1, the length of the threaded section is L2, and L1 is equal to or less than L2.

Optionally, a plurality of recesses are formed in the threaded section at intervals along the circumferential direction of the rod body.

Optionally, 5 recesses are uniformly arranged on the threaded section along the circumferential direction of the rod body at intervals.

The invention also discloses an assembling method of the extrusion deformation fastener, which comprises the following steps:

s1: penetrating a fastener into the mounting hole of the connected piece, sleeving a high lock nut on the thread section, and pre-screwing;

s2: inserting a core rod matched with the tooth part on the wrenching tool into the wrenching groove to limit the fastener and enable the wrenching tool to clamp the outer wall of the high lock nut;

s3: and continuously screwing the high-locking nut, after the high-locking nut is contacted with the connected piece, extruding the bulge by the screwing tool to enable the high-locking nut to deform so as to partially extrude into the concave part until the resistance of the high-locking nut to the screwing tool disappears, and finishing the installation.

In conclusion, the beneficial effects of the invention are as follows:

1. the outer wall of the threaded section is provided with the concave part, and the high-locking nut is extruded into the concave part after being extruded and deformed by external force to form self-locking with the high-locking nut.

2. According to the invention, the wrenching groove is formed in one end, away from the head, of the fastener, the tooth part is arranged on the inner wall of the wrenching groove, and the outer toothed core rod on the wrenching tool is matched with the tooth part, so that the contact area between the core rod and the fastener is increased, the fastener has higher torque performance, the limit torque is increased, the radial stress is reduced, higher torque transmission is provided, the slipping phenomenon between the core rod and the fastener is avoided, and the assembly quality is ensured.

Drawings

FIG. 1 is a perspective view of a fastener of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a perspective view of a high lock nut of the present invention adapted to a fastener.

Fig. 4 is a front view of fig. 3.

Fig. 5 is a cross-sectional view taken along a-a of fig. 4.

Fig. 6 is a schematic view of the fastener and the high lock nut in a connected state without compression deformation.

FIG. 7 is a schematic structural view of the self-locking of the fastener and the high-lock nut after extrusion deformation.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

Referring to fig. 1, 2, 6 and 7, an extrusion fastener 10 includes a head 11 and a shank 12, the shank 12 has a smooth section 121 and a threaded section 122, the head 11, the smooth section 121 and the threaded section 122 are integrated, and the head 11, the smooth section 121 and the threaded section 122 are of a known structure and design; at least one concave part 123 is arranged on the outer wall of the threaded section 122, and the high lock nut 20 is partially extruded into the concave part 123 after being extruded and deformed so as to form self-locking; preferably, 5 concave parts 123 are arranged on the outer wall of the obtained threaded section 122 at intervals along the circumferential direction of the rod body 12, so that the extruded and deformed high-lock nut can be uniformly extruded.

Referring to fig. 2, in some embodiments, the recess 123 is disposed along the axial direction of the rod 12, the length of the recess 123 along the axial direction of the rod 12 is L1, and the length of the threaded section 122 is L2, wherein L1 ≦ L2.

Referring to fig. 1 and 6, in some embodiments, a screwing groove 124 is formed in an end surface of the threaded section 122 on a side away from the head 11 along an axial direction of the rod body 12, and a plurality of tooth portions 125 are arranged at intervals on an inner wall of the screwing groove 124; preferably, in this embodiment, the inner wall of the wrenching groove 124 is provided with 6 teeth 125 at regular intervals along the circumference of the rod body 12.

Referring to fig. 1, in some embodiments, the end of the tooth 125 remote from the head 11 is provided with a chamfer 126, the chamfer 126 being provided to increase the opening of the wrenching slot 124 to facilitate insertion of a core rod on the wrenching tool 3.

2-4, 6 and 7, in some embodiments, wherein the high lock nut 20 adapted to the present invention comprises a nut body 21 with an internal thread and a contact portion 22 provided at one end of the nut body 21 and coaxially arranged with the nut body 21, at least one protrusion 211 is formed on the outer wall of the nut body 21, wherein the length of the protrusion 211 in the axial direction of the nut body 21 is L3, L3 ≦ L1; after the nut body 21 is sleeved on the threaded section 122, the high-lock nut 20 is connected with the fastener 10 in a threaded fit manner, at this time, the wrenching tool 3 is used for clamping the outer wall of the high-lock nut 20 and twisting the high-lock nut 20, after the contact part 22 is contacted with a connected piece, the protrusion 211 is extruded by the wrenching tool 3 to deform the nut body 21, and the deformed nut body 21 is partially extruded into the concave part 123, so that the high-lock nut 20 tightly embraces the fastener 10 to form strong self-locking, and the reliability of connection of a high-lock connection pair is greatly improved.

Referring to fig. 3 and 6, in some embodiments, the outer wall of the nut body 21 is provided with 3 protrusions 211 uniformly spaced along the circumferential direction of the nut body 21, so that the nut body 21 is uniformly deformed by being pressed.

Referring to FIG. 5, in some embodiments, the outer diameter of the contact portion 22 is set to D1, the maximum outer diameter of the nut body 21 is set to D2, wherein D1 is equal to or greater than D2, the contact area between the high lock nut 20 and the connected piece is increased through the contact portion 22, and the pressure between the high lock nut 20 and the connected piece is reduced, so that the connected piece is prevented from being deformed under pressure.

The assembly steps of the fastener are as follows:

s1: the fastener 10 is inserted into the mounting hole of the connected piece, and the high lock nut 20 is sleeved on the threaded section 122 and is pre-screwed;

s2: inserting a core rod matched with the tooth part 125 on the wrenching tool 3 into the wrenching groove 124 to limit the fastener 10, ensuring that the fastener 10 keeps still in the installation process, and clamping the outer wall of the high lock nut 20 by the wrenching tool 3;

s3: and continuously screwing the high-locking nut 20, after the high-locking nut 20 is contacted with a connected piece, extruding the protrusion 211 by the screwing tool 3 to deform the high-locking nut 20, extruding the high-locking nut 20 into the concave part 123 until the resistance of the high-locking nut 20 to the screwing tool 3 disappears, and tightly holding the fastener 10 by the high-locking nut 20 to finish self-locking installation.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. An extrusion fastener comprising a head (11) and a shank (12), the shank (12) having a smooth face section (121) and a threaded section (122); the self-locking nut is characterized in that a concave part (123) which is extruded by the extruded and deformed part of the high-locking nut (20) to form self-locking is arranged on the outer wall of the thread section (122); the end face of one side, away from the head (11), of the threaded section (122) is provided with a screwing groove (124) along the axis direction of the rod body (12), and the inner wall of the screwing groove (124) is provided with a plurality of tooth parts (125) at intervals.

2. The swage fastener of claim 1, wherein: 6 tooth parts (125) are uniformly arranged on the inner wall of the wrenching groove (124) at intervals along the circumferential direction of the rod body (12).

3. An extruded fastener according to claim 2, wherein the end of the teeth (125) remote from the head (11) is provided with a chamfer (126).

4. An extruded fastener according to claim 1, wherein the recess (123) is provided along the axial direction of the shank (12), and the length of the recess (123) along the axial direction of the shank (12) is L1, and the length of the threaded section (122) is L2, wherein L1 ≦ L2.

5. An extruded fastener according to claim 1, wherein the threaded section (122) is provided with a plurality of recesses (123) circumferentially spaced along the shank (12).

6. An extruded fastener according to claim 5, wherein the threaded section (122) is provided with 5 recesses (123) circumferentially spaced evenly along the shank (12).

7. A method of assembling a crush fastener as claimed in any one of claims 1 to 6, including the steps of:

s1: a fastener is inserted into the mounting hole of the connected piece, and a high lock nut (20) is sleeved on the thread section (122) and is screwed tightly;

s2: inserting a core rod matched with the tooth part (125) on the wrenching tool (3) into the wrenching groove (124) to limit the fastener, and enabling the wrenching tool (3) to clamp the outer wall of the high lock nut (20);

s3: and continuously screwing the high-locking nut (20), after the high-locking nut (20) is contacted with the connected piece, the high-locking nut (20) is extruded by the wrenching tool (3) to enable the high-locking nut (20) to deform to partially extrude into the concave part (123) until the resistance of the high-locking nut (20) to the wrenching tool (3) disappears, and the installation is finished.