WO2020133733A1

WO2020133733A1 - Rivetless micro-riveting device

Info

Publication number: WO2020133733A1
Application number: PCT/CN2019/078543
Authority: WO
Inventors: 郭钟宁; 黄兴; 邓宇; 张会寅; 谭蓉
Original assignee: 广东工业大学; 佛山市铬维科技有限公司
Priority date: 2018-12-24
Filing date: 2019-03-18
Publication date: 2020-07-02
Also published as: CN109482750A

Abstract

A rivetless micro-riveting device, comprising a laser emitting system (3) used for emitting a laser, a laser conduction device used for conducting the laser to a riveting point of a workpiece, and a mounting table used for placing the workpiece (12), wherein a water tank for placing deionized water so that the deionized water fills the riveting point of the workpiece is provided on the mounting table so as to induce the deionized water to generate cavitation bubbles when the laser is irradiated to the riveting point. A plasma shock wave generated in the early stage of cavitation bubble growth and a shock wave and jet generated when the cavitation bubbles collapse are guided to the workpiece, so that the workpiece is plastically deformed to form a riveted mosaic point, and riveting is completed. The rivetless micro-riveting device uses the deionized water as a medium, and uses the shock wave loading of the cavitation bubbles generated by using the laser to induce the deionized water during the expansion and collapse processes instead of applying a force using a traditional solid punch. Two foil plates are riveted together at the microscale to implement the connection of micro-foil plate parts of the same or different materials.

Description

Rivetless micro riveting device

Technical field

The invention relates to the technical field of miniaturized connection, and more particularly, to a rivetless micro riveting device.

Background technique

Nowadays, the precision and miniaturization of products have become an important hotspot in the development of industrial manufacturing. Precision and miniaturized products have important applications in medical, aerospace, precision electronics and other fields, and are widely concerned by academia and industry. , And the connection of parts in the manufacture of micro products is a part that cannot be ignored. In the micro manufacturing industry, there is an urgent need for efficient micro connection technology that can connect the same or different foil materials, and achieving efficient and reliable connection of micro parts is a micro manufacturing technology. New challenges presented.

The connection methods of the micro-foil materials in the prior art include: traditional fusion welding, resistance welding, traditional mechanical fastening technology, adhesive bonding, and laser heating micro riveting welding.

Among them, traditional fusion welding and resistance welding are not suitable for materials with low melting points and good thermal conductivity. These two technologies are based on thermal effects and cannot connect dissimilar metal foil plates, especially at the micro scale, the materials cannot form effective Molten pool.

The process of adhesive technology is more complicated, and it is prone to lack of glue and excessive glue. The process needs to solve the problem of cleaning and requires post-processing, such as drying to remove more than the glue.

Laser-heated rivetless riveting uses materials to absorb laser light and melt to form, but it has great limitations for materials with high reflection, high melting point, and strong thermal conductivity.

Therefore, how to solve the problem of poor effect and small scope of application in the method of connecting micro parts is a problem urgently needed to be solved by those skilled in the art.

Summary of the invention

In view of this, the object of the present invention is to provide a rivet-free micro riveting device, which can realize an efficient and reliable micro connection of the same kind or different kinds of foil plate materials.

In order to achieve the above objectives, the present invention provides the following technical solutions:

A rivetless micro riveting device includes a laser emitting system for emitting laser, a laser conducting device for conducting laser to a riveting point of a workpiece, and a mounting table for placing a workpiece, the mounting table is provided with a place for placing Deionized water, so that the deionized water fills the water tank of the riveting point of the workpiece, so that when the laser is irradiated to the riveting point, the deionized water induces cavitation bubbles.

Preferably, it further includes a detection device for detecting the position of the laser irradiation, the detection device is signal-connected to a control system, and the control system is used to move the position of the mounting table according to the detection information of the detection device, so that the laser Irradiated at the riveting point of the workpiece.

Preferably, the mounting platform is provided on a three-dimensional mobile platform for adjusting the position of the mounting platform, and the three-dimensional mobile platform is signal-connected to the control system.

Preferably, the detection device is a CCD online video detection system.

Preferably, the control system, the laser emission system, and the three-dimensional mobile platform are all set on a machine tool workbench.

Preferably, the mounting table is further provided with a focusing lens for focusing the laser on the riveting point.

Preferably, the laser transmission device is a mirror.

Preferably, the reflector is provided on the mounting platform, and the reflector and the mounting platform are kept relatively fixed.

Preferably, the mounting table includes an upper mold and a lower mold for clamping a workpiece, and a clamp for clamping the upper mold and the lower mold, and the water tank is a concave provided at an upper end of the upper mold Hole, the lower end of the upper die is provided with a small hole communicating with the recessed hole for the shock wave of the cavitation bubble to expand and collapse, the upper end of the lower die is at the A groove is provided at the riveting point to facilitate plastic deformation of the workpiece.

Preferably, a transparent glass cover plate for preventing splash of deionized water is also provided at the upper end opening of the upper mold.

The rivetless micro riveting device provided by the present invention includes a laser emitting system for emitting laser light, a laser conducting device for conducting laser light to a riveting point of a workpiece, and a mounting table for placing the workpiece. When placing deionized water to fill the water tank of the riveting point of the work piece with deionized water, when the laser is irradiated to the riveting point, the deionized water is induced to produce cavitation bubbles, and the plasma shock wave and cavitation generated in the initial stage of cavitation bubble growth The shock waves and jets generated during the collapse are guided to the workpiece, causing the plastic deformation of the workpiece to form a riveting inlay point, and the riveting is completed. The rivetless micro riveting device provided by the present invention uses deionized water as a medium, and uses the shock wave loading of the cavitation bubble generated by the laser induced deionized water during expansion and collapse instead of the traditional physical punch to apply force. Under the scale, two foil plates are riveted together to realize the connection of micro foil plates of the same or different materials. Aiming at the problem of high-reflectivity, high-melting point, and high thermal conductivity foil connection, rivetless riveting technology is based on plastic deformation of the material, combined with laser-induced technology, and cold extrusion deformation according to the material of the plate itself to form deformation points without external heat source. It can complete the micro-connection of the same kind or different kinds of metal foil plate materials, which has the advantages of simple structure, fast response speed, high reliability, clean process, wide application range and low cost.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only This is an embodiment of the present invention. For those of ordinary skill in the art, without paying any creative labor, other drawings may be obtained according to the provided drawings.

FIG. 1 is a schematic diagram of an internal structure of a specific embodiment of a rivetless micro riveting device provided by the present invention.

Among them, 1-machine table, 2-control system, 3-laser emission system, 4-reflector, 5-concave hole, 6-small hole, 7-groove, 8-focus lens, 9-detection device, 10 -Transparent glass cover, 11-upper mold, 12-workpiece, 13-lower mold, 14-three-dimensional moving platform, 15-fixture.

detailed description

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

The core of the present invention is to provide a rivetless micro riveting device, which can realize the efficient and reliable micro connection of the same kind or different kind of foil plate materials.

Please refer to FIG. 1, which is a schematic diagram of an internal structure of a specific embodiment of a rivetless micro riveting device provided by the present invention.

A rivetless micro riveting device provided by the present invention includes a laser emitting system 3 for emitting laser light, a laser conducting device for conducting laser light to the riveting point of the work piece 12, and a mounting table for placing the work piece 12, installation The table is provided with a water tank for placing deionized water so that the deionized water fills the riveting point of the work piece 12 to induce cavitation bubbles in the deionized water when the laser is irradiated to the riveting point.

Among them, the main function of the laser emission system 3 is to emit laser light that can induce deionized water to generate cavitation bubbles. The laser emission system 3 generally includes a laser emitter, a cooling system, and optical components. The laser transmitting device is used to transmit the laser light emitted by the laser emitting system 3 to the riveting point of the workpiece 12, the mounting table is used to install the workpiece 12, and the riveting point of the workpiece 12 is filled with deionized water, so the mounting table needs to be installed In the water tank for storing deionized water, the upper end of the water tank should be able to allow the laser to enter, so that the laser can irradiate the riveting place of the workpiece 12, so that the laser induces cavitation bubbles in the deionized water at the riveting place of the workpiece 12, deionized water To remove excess impurity ion water, so that the laser will not be disturbed when passing through the deionized water.

When the laser beam generated by the laser emitting system 3 is irradiated to the riveting point of the workpiece 12 filled with deionized water, the deionized water is induced to generate cavitation bubbles, and the plasma shock wave generated at the initial stage of cavitation bubble growth and the collapse of the cavitation bubble are generated. The shock wave and jet flow are guided to the workpiece, causing the plastic deformation of the workpiece to form a riveting inlay point, and completing the riveting.

The rivetless micro riveting device provided by the present invention uses deionized water as a medium, and uses the shock wave loading of the cavitation bubble generated by the laser induced deionized water in the process of expansion and collapse instead of applying the force of the traditional physical punch. Under the scale, two foil plates are riveted together to realize the connection of micro foil plates of the same or different materials. Aiming at the problem of high-reflectivity, high-melting point, and high thermal conductivity foil connection, rivetless riveting technology is based on plastic deformation of the material, combined with laser-induced technology, and cold extrusion deformation according to the material of the plate itself to form deformation points without external heat source. It can complete the connection of the same kind or different kind of metal foil plate materials, which has the advantages of simple structure, fast response speed, high reliability, clean process, wide application range and low cost.

On the basis of the above embodiment, it further includes a detection device 9 for detecting the position of the laser irradiation, the detection device 9 is signally connected to the control system 2, and the control system 2 is used to move the position of the mounting table according to the detection information of the detection device 9, In order to irradiate the laser at the riveting point of the workpiece 12.

Considering that the laser beam generated by the laser emitting system 3 may not be accurately irradiated at the riveting point of the workpiece 12 due to the change of the position of the workpiece 12 during the irradiation, it is necessary to move the laser emitting system 3 or the mounting table at this time. Position to adjust the laser irradiation position.

In order to improve the intelligence of the operation of the rivetless micro riveting device provided by the present invention, a detection device 9 for detecting the position of the laser irradiation can also be provided. The detection device 9 can be signal-connected to the control system 2 and the control system 2 can be based on the detection device 9 The detected laser irradiation position adjusts the position of the mounting table, so that the laser can be accurately irradiated on the riveting point of the workpiece 12, so as to automatically adjust the relative position of the laser irradiation and the riveting point of the workpiece 12.

On the basis of the above-mentioned embodiment, the mounting table is set on the three-dimensional mobile platform 14 for adjusting the position of the mounting table, and the three-dimensional mobile platform 14 is signal-connected to the control system 2.

Considering the manner in which the control system 2 moves the mounting table, preferably, the control system 2 can control the connection to the three-dimensional mobile platform 14 and then set the mounting table on the three-dimensional mobile platform 14 so that the control system 2 can control the three-dimensional mobile platform 14 To adjust the position of the mounting table. The three-dimensional mobile platform 14 is a precise mobile platform that can drive the mounting table to fine-tune the position to achieve laser alignment.

On the basis of the above embodiments, considering the selection of the detection device 9 for detecting the laser irradiation position, preferably, the detection device 9 is a CCD online video detection system, which has non-contact, fast speed and flexibility Good and other advantages.

On the basis of the above embodiments, the control system 2, the laser emission system 3, and the three-dimensional mobile platform 14 can be installed on the machine tool workbench 1. The machine tool workbench 1 has moisture resistance, corrosion resistance, colorfastness, and temperature coefficient. Low advantages.

On the basis of the above embodiments, in order to further increase the intensity of the laser irradiated on the riveting point, a focusing lens 8 for focusing the laser on the riveting point may also be provided on the mounting table. The focusing lens 8 should be arranged at a distance from the riveting point A focal length position so that the focusing lens 8 can focus the laser at the riveting point to improve the riveting effect.

Considering the selection of the laser transmission device, on the basis of the above embodiment, preferably, the laser transmission device may be a mirror 4, and a plurality of mirrors 4 for changing the laser irradiation path may be provided along the laser irradiation path, so that The laser can finally illuminate the riveting point of the mounting table. It should be pointed out that the mirror 4 here should be a plane mirror.

On the basis of the above embodiment, the mirror 4 can be installed on the mounting table, so that the position of the mirror 4 and the mounting table can be kept relatively fixed, so that the light beam generated by the laser emitting system 3 illuminates the mirror at a certain angle When it is on, it can be accurately irradiated on the riveting point on the installation table.

Based on any of the above embodiments, the mounting table includes an upper mold 11 and a lower mold 13 for clamping the workpiece 12, and a clamp 15 for clamping the upper mold 11 and the lower mold 13, and the water tank is provided on the upper mold 11 The concave hole 5 at the upper end, the lower end of the upper die 11 is provided with a small hole 6 communicating with the concave hole 5 for the shock wave of the cavitation bubble to expand and collapse, and the upper end of the lower die 13 is riveted At the point, a groove 7 is provided to facilitate plastic deformation of the workpiece 12.

The mounting table is mainly used to place the work piece 12 to be riveted, and to fill deionized water at the riveting point of the work piece 12, the structural setting of the mounting table can have various options, for example, the mounting table may include The upper mold 11 and the lower mold 13, and the jig 15 for holding the upper mold 11 and the lower mold 13, during use, the workpiece 12 can be placed between the upper mold 11 and the lower mold 13, and then the clamp 15 Clamp the upper mold 11 and the lower mold 13 so that the upper mold 11 and the lower mold 13 fix the workpiece 12, and the water tank for storing deionized water may be a concave hole 5 provided at the upper end of the upper mold 11 and the lower end of the upper mold 11 A small hole 6 communicating with the recessed hole 5 can be provided, and the laser can be irradiated at the riveting point through the upper mold 11, thereby inducing deionized water to produce cavitation bubbles, and the shock wave of the cavitation bubbles during expansion and collapse can pass through The small hole 6 acts on the workpiece 12 to realize the process of riveting the workpiece 12.

On the basis of the above embodiment, a transparent glass cover plate 10 for preventing splash of deionized water is also provided at the upper end opening of the upper mold 11.

Considering that the shock wave of the cavitation bubble in the process of expansion and collapse will be radiated to the surroundings, in order to avoid the deionized water splashing out of the concave hole 5, the upper end of the upper mold 11 can be provided to cover the concave hole 5 to prevent the removal The cover plate of the ion water splash is preferably a transparent glass cover plate 10.

In the process of use, the concave hole 5 can be filled with deionized water, which is conducive to the stability of the laser light path in the water, and can also make the laser focusing position more accurate.

The embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other.

The rivetless micro riveting device provided by the present invention has been described in detail above. In this article, specific examples are used to explain the principles and implementations of the present invention. The descriptions of the above examples are only used to help understand the method of the present invention and its core ideas. It should be noted that for those of ordinary skill in the art, without departing from the principles of the present invention, the present invention may also be subject to several improvements and modifications, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A rivetless micro riveting device is characterized by comprising a laser emitting system (3) for emitting laser, a laser conducting device for conducting laser to the riveting point of the workpiece (12), and a workpiece (12) for placing The installation table is provided with a water tank for placing deionized water so that the deionized water fills the riveting point of the workpiece (12), so as to induce cavitation bubbles in the deionized water when the laser is irradiated to the riveting point.
The rivetless micro riveting device according to claim 1, further comprising a detection device (9) for detecting a laser irradiation position, the detection device (9) is signal-connected to the control system (2), the The control system (2) is used to move the position of the mounting table according to the detection information of the detection device (9) so that the laser is irradiated at the riveting point of the workpiece (12).
The rivetless micro riveting device according to claim 2, characterized in that the mounting table is provided on a three-dimensional mobile platform (14) for adjusting the position of the mounting table, and the three-dimensional mobile platform (14) is signal-connected For the control system (2).
The rivetless micro riveting device according to claim 3, characterized in that the detection device (9) is a CCD online video detection system.
The rivetless micro riveting device according to claim 4, characterized in that the control system (2), the laser emitting system (3), and the three-dimensional mobile platform (14) are all provided on a machine tool table ( 1) On.
The rivetless micro riveting device according to claim 1, wherein the mounting table is further provided with a focusing lens (8) for focusing the laser on the riveting point.
The rivetless micro riveting device according to claim 6, characterized in that the laser transmission device is a reflector (4).
The rivetless micro riveting device according to claim 7, characterized in that the mirror (4) is provided on the mounting table, and the mirror (4) is relatively fixed to the mounting table.
The rivetless micro riveting device according to any one of claims 1 to 8, wherein the mounting table includes an upper die (11) and a lower die (13) for clamping the workpiece (12), and In the clamp (15) holding the upper mold (11) and the lower mold (13), the water tank is a concave hole (5) provided at the upper end of the upper mold (11), and the upper mold ( 11) The lower end of the lower die (13) is provided with a small hole (6) communicating with the concave hole (5) for passing the shock wave of the cavitation bubble during expansion and collapse The upper end of is provided with a groove (8) at the riveting point to facilitate plastic deformation of the workpiece (12).
The rivetless micro riveting device according to claim 9, characterized in that a transparent glass cover plate (10) for preventing splashing of deionized water is also provided at the upper end opening of the upper mold (11).