WO2020133975A1

WO2020133975A1 - Rotation friction squeeze riveting apparatus and riveting method therefor

Info

Publication number: WO2020133975A1
Application number: PCT/CN2019/092650
Authority: WO
Inventors: 倪瑞洋; 沈以赴; 严银飞; 侯文涛; 李军平; 郭晓晗
Original assignee: 南京航空航天大学
Priority date: 2018-12-27
Filing date: 2019-06-25
Publication date: 2020-07-02
Also published as: CN109433997A

Abstract

A rotation friction squeeze riveting apparatus, comprising a work bench (5), a work head, a supporting plate (10) and a work head drive control apparatus; the work head comprises a clamping apparatus (1) and a friction head (2), a bottom surface of the friction head (2) being provided with a spherical recess (3); circular recesses (9) are processed on the supporting plate (10), the circular recesses (9) matching flush heads of flush rivets (4). A rotation friction squeeze riveting method.

Description

Rotary friction extrusion riveting device and riveting method

Technical field

The invention relates to the technical field of metal connection, in particular to a rotary friction extrusion riveting device and a riveting method.

Background technique

Riveting technology is an indispensable connection technology in the fields of automobile manufacturing, aerospace and other fields. Traditional cold riveting technology is usually used on small-diameter rivets. At the same time, the plasticity of the rivet material is high; hot riveting is to heat the rivet to a certain temperature. The later riveting method is suitable for rivets with large diameter and poor plasticity. However, due to the additional heating, the energy consumption of the riveting process is large. In the traditional thermal riveting process, the rivet heated to a certain temperature needs to be inserted into the nail hole. It is relatively high and requires the heating device to be close to the operating site.

Summary of the invention

The technical problems to be solved by the present invention are:

In order to overcome the shortcomings in the existing hot riveting technology, the purpose of the present invention is to provide a rotary friction extrusion riveting device with a simple structure. Another object of the present invention is to provide a riveting method using the device.

The present invention adopts the following technical solutions to solve the above technical problems:

The technical solution 1 of the present invention is a rotary friction extrusion riveting device, including a working table, a working head, a supporting plate and a working head drive control device, wherein,

The working table is used for overlapping and fixing the first work piece and the second work piece, and making more than one circular through hole on the first work piece and the corresponding more than one circular through hole on the second work piece coaxial, wherein the first work piece The one or more circular through-holes on the second workpiece and the corresponding one or more circular through-holes have equal diameters, respectively, for inserting the nail rods of flat head rivets;

The support plate is provided on the side of the second work piece, parallel to the surface of the work piece, and the surface of the support plate facing the work piece is processed with a position corresponding to more than one circular through hole of the first work piece and the second work piece, and the shape matches the flat head of the flat head rivet More than one circular groove of the support plate, the flat heads of more than one flat head rivet are respectively included in the circular groove of the support plate, the support plate is used to move to the workpiece against the surface of the workpiece and the nail rods of more than one flat head rivet are inserted into the first More than one circular through hole corresponding to the workpiece and the second workpiece;

The working head is set at the nail rod end of the flat head rivet, and includes a clamping device and a friction head. One end of the clamping device is operatively connected to the driving control device of the working head, and the other end is fixedly connected to one end of the friction head. Spherical groove with friction head;

The working head drive control device drives the clamping device to drive the rotation and displacement of the friction head, so that the spherical grooves of the friction head are aligned with more than one flat head rivet one by one and frictionally squeezes the nail rod end of the flat head rivet. The spherical crown nail head structure with the same shape of the spherical groove of the friction head plays a riveting and fixing role on the first workpiece and the second workpiece.

Preferably, the radius of the nail rod of the flat head rivet is smaller than the radius of the circular through hole of the first workpiece by 0.5 to 1 mm.

Preferably, the shape of the circular groove of the supporting plate matches the flat head of the flat head rivet includes: the radius of the circular surface of the circular groove of the supporting plate is the same as the flat head radius of the flat head rivet, and the groove depth is equal to the flat head thickness of the flat head rivet Same, limited effect on flat head rivets.

Preferably, the positions of the circular grooves processed on the supporting plate corresponding to the corresponding one or more circular through holes of the first workpiece and the second workpiece include: the circular grooves processed on the supporting plate are respectively The corresponding one or more circular through-hole coaxial lines of the first workpiece and the second workpiece.

Preferably, the radius of the spherical surface of the spherical groove of the friction head is the same as the radius of the flat head of the flat head rivet, and the arc of the cross section of the spherical groove of the friction head is 1/3 circle.

Preferably, both the friction head and the support plate are made of a material with a hardness greater than that of the flat head rivets.

In another embodiment, a rotary friction extrusion riveting method using the rotary friction extrusion riveting device described in technical solution 1 includes the following steps:

(a) Decontaminate the inner surface of more than one circular through hole and the surface of more than one flat head rivet on the first and second workpieces;

(b) The first work piece and the second work piece are overlapped so that more than one circular through hole on the first work piece and the corresponding more than one circular through hole on the second work piece are coaxial, and the first work piece and the second work piece are clamped and fixed Two artifacts;

(c) Insert the flat end of more than one flat head rivet into the circular groove of the support plate, move the support plate against the surface of the second workpiece and insert the nail rod of the flat head rivet into the circular through hole of the workpiece;

(d) Adjust the position of the friction head so that the friction head is coaxial with a circular through hole on the first and second workpieces, so that the friction head rotates at high speed and presses down toward the workpiece side, and the spherical groove of the friction head squeezes out The nail rod end of the flattened head rivet, when the end surface of the friction head contacts the surface of the first workpiece, the friction head keeps rotating, while lifting axially, at this time, the spherical groove shape of the nail head of the flat head rivet is formed with the friction head The same ball crown nail head structure;

(e) Repeat step (d) for the other one of the more than one flat head rivet until the spherical rod head structure is formed at the nail rod end of more than one flat head rivet, which plays a riveting and fixing role on the first work piece and the second work piece ;

(f) After the first work piece and the second work piece are cooled, they are removed from the worktable to complete the riveting connection.

Preferably, the volume of the portion of the nail head of the flat head rivet that is higher than the first workpiece is 1.1 times the volume of the spherical groove of the friction head.

Preferably, the first workpiece and the second workpiece are made of the same or different metals.

Preferably, the rotation speed of the friction head in the step (d) is 1000-1800 rpm, and the pressing speed is 2-5 mm/min.

Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

The device of the present invention has a simple structure, and flat head rivets used for riveting are standard parts; the present invention solves the stepwise riveting operation of traditional hot riveting, that is, the process of heating the rivet first and then inserting the rivet, which simplifies the operation and improves the efficiency; The friction head rotates and squeezes the rivet to obtain a complete riveted joint at one time; the present invention uses a circular groove limiting rivet of the support plate so that the rivet is not eccentric in the through hole; the present invention uses friction heat to heat the rivet without the need of an external heating source, The cost is saved; the groove design of the friction head can obtain the nail head with regular shape at one time, with good repeatability and high joint strength. After the riveting is completed, the spherical crown nail head structure of the rivet nail rod end plays a good axial fixing role .

BRIEF DESCRIPTION

Figure 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a half cross-sectional view of the present invention.

detailed description

Rotary friction extrusion riveting technology is to use the driving device to drive the friction head to rotate at high speed, and to thermally plasticize the rivet through the friction between the spherical groove of the friction head and the rivet rod end, and at the same time make the plasticization under the friction extrusion of the friction head The rivet material fills the spherical groove, and finally a spherical crown nail head structure is formed at the end of the nail rod, so as to realize the riveting connection of the workpiece. This riveting method uses flat head rivets, which is easy to manufacture; friction heat and squeezing force are applied at the same time during the riveting process, avoiding the stepwise operation of heating the rivet first and then inserting the rivet in the traditional hot riveting, simple operation, easy to realize automation; the riveting method No additional heating device is needed, saving cost and energy consumption.

The technical solution of the present invention will be further described in detail below with reference to the drawings:

As shown in Fig. 1, the

metal workpieces

6 and 11 of 150mm×150mm×4mm are lapped and fixed on the working table 5. The

metal workpieces

6 and 11 are the same or different metal materials, and the through holes 7 and 8 are processed on the through hole radius Both are 3.5mm, and the through holes 7 and 8 are coaxial.

As shown in Fig. 2, the length of the nail rod of the flat head rivet 4 is 16mm, the radius is 3mm, the radius of the flat head is 6mm, and the thickness is 2.4mm. The friction head 2 is connected to the working head drive control device through the clamping device 1. The length of the non-clamping part of the friction head 2 is 20 mm and the radius is 9 mm. The bottom surface of the friction head 2 is provided with a spherical groove 3 whose spherical radius is 7 mm. The radius of the bottom circular surface is 6mm. A circular groove 9 is processed on the support plate 10, the radius of the circular surface is 6 mm, and the height of the groove is 2.4 mm.

Before riveting, insert the flat end of the flat head rivet 4 into the circular groove 9 of the support plate 10, move the support plate 10 against the surface of the workpiece 11 and insert the nail rod of the flat head rivet 4 into the circular through holes 7 of the

work pieces

6 and 11 and 8;

The friction head 2 rotates at high speed and axially squeezes the flat head rivet 4, the plasticized ball head rivet 4 gradually fills the spherical groove 3, and when the bottom surface of the friction head 2 comes into contact with the surface of the workpiece 6, the axial extrusion movement is stopped and the friction head 2 The shaft is lifted up to form a spherical crown nail head structure at the nail rod end of the flat head rivet 4.

Repeat the steps for the other one of the more than one flat head rivet, so that the

work pieces

6 and 11 are riveted and fixed.

After the end face of the friction head contacts the surface of the workpiece, the axial squeezing movement can be stopped by setting the coordinates of the tool setting before riveting.

Example 1

The 2024 aluminum alloy riveting connection is carried out by using the rotary friction extrusion riveting device as shown in Figure 1, which specifically includes the following steps:

(1) Decontaminate the inner surfaces of the through holes 7 and 8 on the 2024

aluminum alloy workpieces

6 and 11 and the surface of the 2024 aluminum alloy flat head rivet 4;

(2) Fix and fix the 2024

aluminum alloy workpieces

6 and 11 so that the through holes 7 and 8 are coaxial, and the friction head 2 is installed on the working head drive control device through the clamping device 1;

(3) Insert the flat end of the aluminum alloy flat head rivet 4 into the circular groove 9 of the support plate 10, move the support plate 10 against the surface of the workpiece 11 and insert the nail rod of the aluminum alloy flat head rivet 4 into the circle of the

workpieces

6 and 11 Through holes 7 and 8;

(4) Adjust the friction head 2 to be directly above the riveting area so that the friction head is coaxial with the through holes 7 and 8. The friction head 2 rotates at a high speed of 1200 rpm and moves axially to the rivet side at a speed of 5 mm/min. The spherical head groove 3 frictionally squeezes the nail rod end of the flat head rivet 4, the plasticized rivet material gradually fills the spherical groove 3 under the action of the rotational extrusion of the friction head 2, when the end surface of the friction head 2 contacts the surface of the workpiece 6 After that, the friction head 2 keeps rotating while being lifted up axially. At this time, a spherical crown nail head structure having the same shape as the spherical groove 3 of the friction head is formed on the nail rod end of the flat head rivet 4;

(5) Repeat step (4) for the other of more than one flat head rivet until the spherical rod head structure is formed at the nail rod end of more than one flat head rivet, which plays a riveting and fixing role on the 2024

aluminum alloy workpieces

6 and 11;

(6) After the

aluminum alloy workpieces

6 and 11 are cooled, remove them from the workbench 5 to complete the riveting connection.

Example 2

The rotary friction extrusion riveting device as shown in Fig. 1 is used for riveting connection of T2 industrial pure copper and 6061 aluminum alloy, which specifically includes the following steps:

(1) Decontaminate the inner surface of the through holes 7 and 8 of the T2 industrial pure copper plate and 6061 aluminum alloy plate and the surface of the T2 pure copper flat head rivet 4;

(2) Fixing and fixing the T2 industrial pure copper plate 6 and 6061 aluminum alloy plate 11 so that the through holes 7 and 8 are coaxial, and the friction head 2 is installed on the working head drive control device through the clamping device 1;

(3) Insert the flat end of the T2 industrial pure copper flat head rivet 4 into the circular groove 9 of the support plate 10, move the support plate 10 against the surface of the 6061 aluminum alloy 11 and insert the nail rod of the T2 pure copper flat head rivet 4 into T2 Through holes 7 and 8 in industrial pure copper and 6061 aluminum alloy;

(4) Adjust the friction head 2 to be directly above the riveting area, so that the friction head and the through holes 7 and 8 are coaxial, the friction head 2 rotates at a high speed of 1400rpm, and moves axially to the rivet side at a speed of 2mm/min, friction The head spherical groove 3 frictionally squeezes the rod end of the T2 pure copper flat head rivet 4, the plasticized rivet material gradually fills the spherical groove 3 under the action of the rotational extrusion of the friction head 2, when the end surface of the friction head 2 and T2 After the surface of the pure copper plate 6 contacts, the friction head 2 keeps rotating while lifting up axially. At this time, a spherical crown nail head structure with the same shape as the spherical groove 3 of the friction head is formed at the nail rod end of the T2 pure copper flat head rivet 4;

(5) Repeat step (4) for the other of more than one flat head rivet until the spherical rod head structure is formed at the nail rod end of more than one flat head rivet, which riveted the T2 industrial pure copper plate 6 and 6061 aluminum alloy 11 Fixation

(6) After the T2 industrial pure copper plate 6 and the aluminum alloy plate 11 are cooled, remove them from the worktable, and then complete the riveting connection.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical idea of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations All belong to the protection scope of the present invention.

Claims

A rotary friction extrusion riveting device includes a working table, a working head, a supporting plate and a working head drive control device, which is characterized in that:

The working table is used for overlapping and fixing the first work piece and the second work piece, and making more than one circular through hole on the first work piece and the corresponding more than one circular through hole on the second work piece coaxial, wherein the first work piece The one or more circular through-holes on the second workpiece and the corresponding one or more circular through-holes have equal diameters, respectively, for inserting the nail rods of flat head rivets;

The support plate is provided on the side of the second work piece, parallel to the surface of the work piece, and the surface of the support plate facing the work piece is processed with a position corresponding to more than one circular through hole of the first work piece and the second work piece, and the shape matches the flat head of the flat head rivet More than one circular groove of the support plate, the flat heads of more than one flat head rivet are respectively included in the circular groove of the support plate, the support plate is used to move to the workpiece against the surface of the workpiece and the nail rods of more than one flat head rivet are inserted into the first More than one circular through hole corresponding to the workpiece and the second workpiece;

The working head is set at the nail rod end of the flat head rivet, and includes a clamping device and a friction head. One end of the clamping device is operatively connected to the driving control device of the working head, and the other end is fixedly connected to one end of the friction head. Spherical groove with friction head;

The working head drive control device drives the clamping device to drive the rotation and displacement of the friction head, so that the spherical grooves of the friction head are aligned with more than one flat head rivet one by one and frictionally squeezes the nail rod end of the flat head rivet. The spherical crown nail head structure with the same shape of the spherical groove of the friction head plays a riveting and fixing role on the first workpiece and the second workpiece.
The rotary friction extrusion riveting device according to claim 1, wherein the radius of the nail rod of the flat head rivet is smaller than the radius of the circular through hole of the first work piece by 0.5 to 1 mm.
The rotary friction extrusion riveting device according to claim 1, wherein the shape of the circular groove of the support plate and the flat head of the flat head rivet include: the radius of the circular surface of the circular groove of the support plate and the flat head The radius of the flat head of the rivet is the same, and the depth of the groove is the same as the thickness of the flat head of the flat head rivet, which has a limited effect on the flat head rivet.
The rotary friction extrusion riveting device according to claim 1, wherein the position of the circular groove processed on the support plate corresponding to the corresponding one or more circular through holes of the first workpiece and the second workpiece includes : The circular grooves processed on the support plate are coaxial with the corresponding one or more circular through holes of the first workpiece and the second workpiece, respectively.
The rotary friction extrusion riveting device according to claim 1, characterized in that the radius of the spherical surface of the spherical groove of the friction head is the same as the radius of the flat head of the flat head rivet, and the arc of the cross section of the spherical groove of the friction head is 1 /3 circle.
The rotary friction extrusion riveting device according to claim 1, wherein the friction head and the support plate are both made of a material with hardness greater than that of the flat head rivet.
A rotary friction extrusion riveting method using the rotary friction extrusion riveting device according to claim 1, characterized in that it includes the following steps:

(a) Decontaminate the inner surface of more than one circular through hole and the surface of more than one flat head rivet on the first and second workpieces;

(b) The first work piece and the second work piece are overlapped so that more than one circular through hole on the first work piece and the corresponding more than one circular through hole on the second work piece are coaxial, and the first work piece and the second work piece are clamped and fixed Two artifacts;

(c) Insert the flat end of more than one flat head rivet into the circular groove of the support plate, move the support plate against the surface of the second workpiece and insert the nail rod of the flat head rivet into the circular through hole of the workpiece;

(d) Adjust the position of the friction head so that the friction head is coaxial with a circular through hole on the first and second workpieces, so that the friction head rotates at high speed and presses down toward the workpiece side, and the spherical groove of the friction head squeezes out The nail rod end of the flattened head rivet, when the end surface of the friction head contacts the surface of the first workpiece, the friction head keeps rotating, while lifting axially, at this time, the spherical groove shape of the nail head of the flat head rivet is formed with the friction head The same ball crown nail head structure;

(e) Repeat step (d) for the other one of the more than one flat head rivet until the nail head structure of the one or more flat head rivets is formed with a spherical crown nail head structure, which plays a riveting and fixing role on the first workpiece and the second workpiece ;

(f) After the first work piece and the second work piece are cooled, they are removed from the worktable to complete the riveting connection.
The rotary friction extrusion riveting method according to claim 7, wherein the volume of the portion of the nail head of the flat head rivet that is higher than the first workpiece is 1.1 times the volume of the spherical groove of the friction head.
The rotary friction extrusion riveting method according to claim 7, wherein the first work piece and the second work piece are made of the same kind or different kind of metals.
The rotary friction extrusion riveting method according to claim 7, wherein the rotation speed of the friction head in the step (d) is 1000 to 1800 rpm, and the pressing speed is 2 to 5 mm/min.