CN108971411B

CN108971411B - Electromagnetic riveting device and method with controllable projectile body position

Info

Publication number: CN108971411B
Application number: CN201810977536.7A
Authority: CN
Inventors: 邓将华; 吕枫; 范治松; 熊永锋; 马天宇
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2023-10-10
Anticipated expiration: 2038-08-27
Also published as: CN108971411A

Abstract

The invention relates to an electromagnetic riveting device and method with controllable elastomer positions, wherein the electromagnetic riveting device comprises a riveting gun, a top iron used for propping up rivets is arranged in front of the riveting gun, a framework wound with coils is arranged in the riveting gun, a pore canal is arranged in the middle of the framework, and a ferromagnetic elastomer capable of sliding forwards and backwards is arranged in the pore canal of the framework; the hole channel of the framework is also internally provided with an electromagnet which is positioned behind the ferromagnetic elastomer and can be adsorbed with the ferromagnetic elastomer after being electrified, and the rear end of the electromagnet is connected with a push rod which extends backwards and penetrates out from the rear end of the riveting gun. The invention has simple structure, stable and reliable work and convenient operation, can realize the control of the projectile body to return to the designated position once and accurately for preparing for the next riveting, breaks through the characteristics of the traditional electromagnetic riveter, is easy to realize the miniaturization of the electromagnetic riveter and widens the riveting forming process window.

Description

Electromagnetic riveting device and method with controllable projectile body position

Technical Field

The invention relates to an electromagnetic riveting device and method with a controllable elastomer position, and belongs to the technical field of metal plastic forming manufacturing.

Background

The electromagnetic forming technology is mainly applied to the manufacturing fields of aerospace and the like, and the electromagnetic forming integral equipment comprises an electromagnetic forming energy storage system and an external electromagnetic force generating device. The electromagnetic riveting is a specific application of electromagnetic forming technology, and the riveting gun is the most core device, is the key of converting electric energy into magnetic field energy and then into mechanical energy, and directly influences the output of electromagnetic forming force.

The traditional riveter that exists at present is mainly applied to aviation assembly field, take the handheld riveter of electric image company as the example, the riveter body form is advancing miniaturized and lightweight orientation all the time, but its internal portion of rifle adopts flat coil to design with the structure that drive copper is repulsed mutually, and the number of turns of flat coil has decided the size of riveting force to a certain extent, and the too many flat coil of turns can make rifle body diameter and volume too big, and the too few turns can make riveting force insufficient, and consequently the structural feature of flat coil becomes the bottleneck of handheld riveter body miniaturization. The development of magnetoresistive coil electromagnetic emission technology, which relies on the solenoid coil to attract the ferromagnetic metal projectile body to generate power that is also sufficient to strike the rivet die to cause plastic deformation of the rivet, has made it possible to make new types of rivets using this emission principle, which is referred to herein as magnetoresistive electromagnetic riveting. The structure using the solenoid coil can be provided with fewer coil layers than the flat coil, and more coils can be distributed along the axial direction, so that the structure is suitable for being used as a riveter body structure, the smaller riveter body diameter is easy to realize, and the diameter limit of the flat coil is broken through.

Electromagnetic riveting is capable of repeatedly realizing discharge riveting for ensuring efficiency, but one disadvantage of reluctance type electromagnetic riveting is that a ferromagnetic elastomer stays in a solenoid after impact riveting, the position is unknown, the attraction force of a coil on the ferromagnetic elastomer varies greatly with the position of the elastomer, and the coil needs to be adjusted to a specific target position for riveting. In the prior art, referring to an electromagnetic riveting device adopting a reciprocating electromagnetic emission technology, disclosed in Chinese patent publication No. CN103949573A, a solution is provided: the method adopts a mode that two sets of discharge systems are respectively used for discharging a main coil and a secondary coil, the main coil is used for transmitting the projectile body, the secondary coil is used for attracting the projectile body to return to the initial position, but the method has the defects that the secondary coil is also used for discharging a capacitor, and short discharge time is generated for the projectile body; secondly, the magnitude of the acting force of the auxiliary coil at the fixed position on the ferromagnetic elastomer at the unknown position is inevitably quite different; third, it is difficult to ensure that the attracted projectile does not experience additional impact rebound problems within the solenoid when returned. It is difficult to achieve this method to control the shot once and accurately back to the target specific location in preparation for the next rivet joint.

Disclosure of Invention

Therefore, the invention aims to provide the electromagnetic riveting device and the electromagnetic riveting method which are simple to operate and convenient to use and have controllable projectile body positions, and the control of the projectile body to return to the designated positions once and accurately can be realized.

The invention is realized by adopting the following scheme: the electromagnetic riveting device comprises a riveting gun, wherein a top iron for propping up a rivet is arranged in front of the riveting gun, a framework wound with a coil is arranged in the riveting gun, a pore canal is arranged in the middle of the framework, and a ferromagnetic elastomer capable of sliding back and forth is arranged in the pore canal of the framework; the hole channel of the framework is also internally provided with an electromagnet which is positioned behind the ferromagnetic elastomer and can be adsorbed with the ferromagnetic elastomer after being electrified, and the rear end of the electromagnet is connected with a push rod which extends backwards and penetrates out from the rear end of the riveting gun.

Further, the riveting gun comprises a barrel seat at the rear part and a shell at the front part, wherein the shell is sleeved on the barrel seat and is connected with the barrel seat through threads; the framework is positioned in the shell, and the lower side of the cylinder seat is connected with a handle.

Further, a gun nozzle is arranged at the front end of the shell, a riveting die capable of sliding back and forth relative to the gun nozzle is arranged in the middle of the gun nozzle, the rear end of the riveting die stretches into a pore canal of the framework, and a spring for pushing the riveting die forwards is arranged at the front end of the framework; the electromagnet is sleeved on the electromagnet sheath, a threaded hole is formed in the rear end of the electromagnet sheath, and a threaded part is arranged at the front end of the push rod and is screwed on the threaded hole of the electromagnet sheath.

Further, a slot is formed in the lower portion of the rear end of the cylinder seat, two threaded holes are formed in the slot, two connecting portions connected with the threaded holes of the slot through screws are arranged at the upper end of the handle, a rectangular groove communicated with the inner cavity of the handle is formed between the two connecting portions, a through hole communicated with the inner cavity of the cylinder seat is formed in the slot, and an axle center through hole communicated with the inner hole of the electromagnet sheath is formed in the side portion of the electromagnet sheath.

Further, the electromagnetic switch is arranged on a connecting line between the first power supply and the electromagnet; the capacitor is connected with the second power supply, a charging switch, a rectifier and a current limiting resistor are arranged on a connecting line between the capacitor and the second power supply, and a discharging switch is arranged on a connecting line between the capacitor and the coil.

An electromagnetic riveting method with a controllable projectile body position comprises the electromagnetic riveting device with the controllable projectile body position, and comprises the following steps:

(1) Closing an electromagnet switch, electrifying the electromagnet to generate strong magnetism, and moving the electromagnet to attract the ferromagnetic elastomer through a push rod and move the ferromagnetic elastomer to a designated position;

(2) Aligning the front end of the riveting gun with the rivet to be riveted and pressing the rivet;

(3) Closing a charging switch to charge the capacitor until the charging is completed;

(4) The electromagnet is powered off by opening the electromagnet switch, the coil is discharged by closing the discharge switch, and then a strong magnetic field is generated by the coil, the ferromagnetic elastomer is attracted, the riveting die moves under the guidance of the framework pore canal and is impacted, and the force is transmitted to the rivet by the impacted riveting die and is subjected to plastic deformation to complete riveting;

(5) Removing the riveting gun from the rivet, and returning the riveting die to the initial position by the elastic force of the spring; closing an electromagnet switch, pushing a push rod to enable the electromagnet to move towards the riveting die direction, attracting the ferromagnetic elastomer by the electromagnet, and then moving the electromagnet back to a designated position to prepare for starting the next riveting.

Compared with the prior art, the invention has the following beneficial effects: the riveting device has the advantages of simple structure, stable and reliable work and convenient operation, can control the projectile body to return to the designated position once and accurately for preparing for the next riveting, improves the riveting efficiency and precision, breaks through the characteristics of the traditional electromagnetic riveter, is easy to realize the miniaturization of the electromagnetic riveter, and widens the riveting forming process window.

The present invention will be further described in detail below with reference to specific embodiments and associated drawings for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.

Drawings

FIG. 1 is a schematic diagram of the working principle of an embodiment of the invention;

FIG. 2 is a cross-sectional view of an embodiment of the present invention;

FIG. 3 is a schematic diagram of the internal structure of an embodiment of the present invention;

FIG. 4 is a schematic diagram of a skeleton construction in an embodiment of the invention;

FIG. 5 is a schematic view of a riveting die configuration in accordance with an embodiment of the present invention;

FIG. 6 is a schematic view of an electromagnet sheath according to an embodiment of the present invention;

FIG. 7 is a schematic illustration of a putter in accordance with an embodiment of the present invention;

FIG. 8 is a schematic view of a handle construction in an embodiment of the invention;

FIG. 9 is a schematic view of a cartridge holder configuration in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of a housing construction in an embodiment of the invention;

FIG. 11 is a schematic view of a gun nozzle configuration in an embodiment of the invention.

Description of the embodiments

As shown in fig. 1-11, an electromagnetic riveting device with a controllable elastomer position comprises a riveting gun, wherein a top iron 13 for supporting a rivet 11 is arranged in front of the riveting gun, a framework 9 around which a coil 7 is wound is arranged in the riveting gun, and the coil 7 is made of a metal material with good conductivity; the middle part of the framework 9 is provided with a pore canal, and a ferromagnetic elastomer 8 capable of sliding back and forth is arranged in the pore canal of the framework 9; the electromagnetic riveting gun is characterized in that an electromagnet 16 which is positioned behind the ferromagnetic elastomer 8 and can be adsorbed with the ferromagnetic elastomer 8 after being electrified is further arranged in a pore canal of the framework 9, the rear end of the electromagnet 16 is connected with a push rod 18 which extends backwards and penetrates out of the rear end of the riveting gun, the ferromagnetic elastomer 8 is made of ferromagnetic metal materials, the ferromagnetic elastomer is subjected to kinetic energy generated by the attraction of an electrified coil to remove rivets to load and realize plastic deformation, the characteristics of the traditional electromagnetic riveting gun are broken through, miniaturization of the electromagnetic riveting gun is easy to realize, the electromagnet which is provided with a power supply can generate attraction to the ferromagnetic elastomer, the electromagnet which moves through the push rod can attract the ferromagnetic elastomer which is positioned at any position after being impacted to accurately move to a specific position, the control of one-time and accurate return to the specific position to prepare for next riveting is realized, the riveting efficiency and the riveting precision are improved, the electromagnetic riveting gun is simple in structure, stable and reliable in operation, and convenient to operate, and a riveting forming process window is widened.

In this embodiment, the riveting gun includes a rear barrel seat 20 and a front housing 21, the housing is sleeved on the barrel seat, and the housing is connected with the barrel seat through threads; the framework 9 is positioned in the shell 21, the lower side of the cylinder seat 20 is connected with a handle 19, and the handle is of a hollow structure for placing a power supply system.

In this embodiment, the front end of the housing 21 is provided with a gun nozzle 22, the middle part of the gun nozzle 22 is provided with a riveting die 10 capable of sliding back and forth relative to the gun nozzle, the rear end of the riveting die 10 extends into a hole channel of the framework 9, and the front end of the framework 9 is provided with a spring 23 for pushing the riveting die 10 forward; the electromagnet 16 is sleeved on the electromagnet sheath 17, a threaded hole 17-1 is formed in the rear end of the electromagnet sheath 17, and a threaded part is arranged at the front end of the push rod 18 and screwed on the threaded hole 17-1 of the electromagnet sheath.

In this embodiment, the nozzle 22 is cylindrical, the outer periphery of the nozzle is threaded 22-1, a mounting hole 22-2 with a diameter smaller than the inner diameter of the nozzle is provided in the center of the front end of the nozzle, and two threaded blind holes 22-3 are provided on the annular surface of the front end of the nozzle.

In this embodiment, the framework 9 is made of an insulating material, and is integrally formed by five sections of pipes with the same inner hole diameter, the first section of pipe 9-1, the second section of pipe 9-2, the third section of pipe 9-3, the fourth section of pipe 9-4 and the fifth section of pipe 9-5 are sequentially formed from front to back, the outer diameters of the second section of pipe 9-2 and the fourth section of pipe 9-4 are the same, and are raised as the outer diameters are larger than those of the other three sections, wherein the second section of pipe 9-2 is provided with a circular through hole 9-21 in the radial direction of the wall surface and is communicated with the inner hole, a slot 9-51 is formed in the pipe wall of the fifth section of pipe 9-5 and is communicated with the inner hole in the axial direction, a through slot 9-41 is formed in the axial direction of the part of the fourth section of pipe 9-4 extending out of the pipe wall more than the third section of pipe 9-3, and the inner hole diameter of the coil framework 9 is slightly larger than that of the ferromagnetic elastomer 8.

In this embodiment, the riveting die 10 is integrally divided into three sections of concentric cylinders, a first section of cylinder 10-1, a second section of cylinder 10-2 and a third section of cylinder 10-3 are sequentially arranged from front to back, the diameter of the second section of cylinder 10-2 is maximum and is convex, and a pit cavity 10-11 is arranged on the front end face of the first section of cylinder 10-1 according to the shape to be riveted; the riveting gun is assembled by taking a framework 9 as a main body, the axis of the framework 9 is a gun body axis, a shell 21 of the riveting gun and a gun nozzle 22 are fixed in a threaded fit manner, the outer diameter of a first section cylinder 10-1 of a riveting die 10 is in clearance fit with the inner diameter of a gun nozzle 22 mounting hole 22-2, a step surface between the inner hole of the gun nozzle 22 and the mounting hole is attached to a front side annular surface 10-5 of a second section cylinder 10-2 on the riveting die 10, and the outer diameter 10-2 of the second section cylinder of the riveting die 10 is in clearance fit with the inner diameter of the gun nozzle 22; the third section cylinder 10-3 of the riveting die 10 is in clearance fit with the inner hole of the first section pipe 9-1 of the framework 9, and the spring is sleeved on the first section pipe of the framework.

In this embodiment, the housing 21 has a cylindrical shape, and the housing rear end outer peripheral portion has an external screw thread portion 21-1. The periphery of the shell is also carved with scale marks 21-2, the periphery wall of the front end of the shell is provided with a slot hole 21-3 along the circumferential direction, the front end of the shell is provided with a step through hole 21-4 for installing a gun nozzle, and the gun nozzle is connected to the step through hole 21-4 through threads.

In this embodiment, a slot 20-1 is formed at the lower part of the rear end of the cylinder seat 20, an axial through hole 20-2 communicating with the inner hole of the cylinder seat 20 is formed at the rear end of the cylinder seat 20, two threaded holes 20-11 are formed on the slot 20-1, two connecting parts 19-1 connected with the threaded holes of the slot 20-1 through screws are formed at the upper end of the handle 19, a bolt hole is formed on the connecting parts 19-1, a rectangular groove 19-12 communicating with the inner cavity of the handle is formed between the two connecting parts 19-1, a through hole 20-12 communicating with the inner cavity of the cylinder seat is formed on the slot, and an axial through groove 17-2 communicating with the inner hole of the electromagnet sheath 17 is formed at the side part of the electromagnet sheath 17.

In the embodiment, the electromagnetic switch device also comprises a power supply system for supplying power to the coil 7 and the electromagnet 16, wherein the power supply system comprises a first power supply 14 electrically connected with the electromagnetic iron and a capacitor 4 electrically connected with the coil, and an electromagnet switch 15 is arranged on a connecting line between the first power supply 14 and the electromagnet; the capacitor 4 is connected with a second power supply, a charging switch 5, a rectifier 2 and a current limiting resistor 3 are arranged on a connecting line between the capacitor 4 and the second power supply, and a discharging switch 6 is arranged on a connecting line between the capacitor and the coil. The lead of the electromagnet 16 on the riveting gun comes out from the axial through groove 17-2 on the electromagnet sheath 17, passes through the slit 9-51 on the fifth section of pipe 9-5 of the framework 9, and then enters the inner cavity of the handle 19 through the perforation 20-12 of the cylinder seat 20 to be connected with the first power supply 14. The wire of the coil 7 comes out from the through groove 9-41 on the wall of the fourth section tube 9-4 of the framework 9, and then enters the inner cavity of the handle 19 through the perforation 20-12 of the cylinder seat 20 to be connected with the capacitor.

Winding a coil 7 on a third section of pipe 9-3 of the framework 9, wherein the second section of pipe 9-2 and the fourth section of pipe 9-4 of the framework 9 are matched with the inner diameter of a shell 21, the outer diameter of an electromagnet sheath 17 is in clearance fit with a pore canal of the framework 9, the electromagnet sheath 17 is arranged in the pore canal of the framework 9, the outer diameter of an electromagnet 16 is matched with the inner diameter of the electromagnet sheath 17, and the electromagnet 16 is fixedly arranged in an inner hole of the electromagnet sheath 17. The outer diameter of the ferromagnetic elastomer 8 is in clearance fit with the inner diameter of the framework 9, a channel of the framework 9 is internally arranged between the electromagnet sheath 17 and the riveting die 10, and a bolt hole 19-11 of the handle 19 is fixedly connected with a threaded hole 20-11 on the gun body rear cover 20 by using a screw in a matched manner. The outer diameter of the push rod 19 is in clearance fit with an axial through hole 20-2 at the rear end of the cylinder seat 20. The inner wall threads of the barrel seat 20 of the riveting gun are connected with the outer wall threads of the shell 21, and the barrel seat 20 and the shell 21 tightly press and fix the framework 9 in the whole gun barrel.

(2) Aligning the riveting die 10 on the gun nozzle 23 at the front end of the riveting gun with the rivet to be riveted and pressing the rivet against the rivet to compress the spring;

(3) Connecting a first power supply, setting riveting voltage, closing a charging switch 5, transforming to a specified voltage through a transformer 1, and charging a capacitor 4 under the action of a rectifier 2 and a current-limiting resistor 3 until the charging is completed;

(4) The electromagnet switch 15 is opened to cut off the electromagnet, the discharge switch 6 is closed to discharge the capacitor to the coil 7, the coil 7 generates a strong magnetic field to attract the ferromagnetic elastomer 8 to move towards the riveting die 10 under the guidance of the pore canal of the framework 9 and generate impact, and the impacted riveting die 10 transmits force to the rivet 11 and enables the rivet to generate plastic deformation to complete riveting;

(5) Removing the riveting gun from the rivet 11, and returning the riveting die 10 to the initial position by the elastic force of the spring 23; the electromagnet switch 15 is closed, the push rod is pushed to enable the electromagnet 16 to move towards the riveting die 10, the electromagnet 16 attracts the ferromagnetic elastomer and then moves back to the designated position, and next riveting is ready to start.

While the foregoing is directed to the preferred embodiment, other and further embodiments of the invention will be apparent to those skilled in the art from the following description, wherein the invention is described, by way of illustration and example only, and it is intended that the invention not be limited to the specific embodiments illustrated and described, but that the invention is to be limited to the specific embodiments illustrated and described.

Claims

1. An electromagnetic riveting device with a controllable elastomer position, which is characterized in that: the riveting gun is internally provided with a framework wound with a coil, the middle part of the framework is provided with a pore canal, and a ferromagnetic elastomer capable of sliding forwards and backwards is arranged in the pore canal of the framework; an electromagnet which is positioned behind the ferromagnetic elastomer and can be adsorbed with the ferromagnetic elastomer after being electrified is also arranged in the pore canal of the framework, and the rear end of the electromagnet is connected with a push rod which extends backwards and penetrates out from the rear end of the riveting gun; the riveting gun comprises a barrel seat at the rear part and a shell at the front part, wherein the shell is sleeved on the barrel seat and is connected with the barrel seat through threads; the framework is positioned in the shell, and the lower side of the cylinder seat is connected with a handle; the front end of the shell is provided with a gun nozzle, the middle part of the gun nozzle is provided with a riveting die capable of sliding back and forth relative to the gun nozzle, the rear end of the riveting die stretches into a pore canal of the framework, and the front end of the framework is provided with a spring for pushing the riveting die forwards; the electromagnet is sleeved on the electromagnet sheath, a threaded hole is formed in the rear end of the electromagnet sheath, and a threaded part is formed in the front end of the push rod and screwed on the threaded hole of the electromagnet sheath; the electromagnetic switch is arranged on a connecting line between the first power supply and the electromagnet; the capacitor is connected with the second power supply, a charging switch, a rectifier and a current limiting resistor are arranged on a connecting line between the capacitor and the second power supply, and a discharging switch is arranged on a connecting line between the capacitor and the coil.

2. A method of electromagnetic riveting a controllable projectile body position comprising the electromagnetic riveting apparatus of claim 1 wherein: the method comprises the following steps: