CN207494786U - A kind of metal and plastics mixing thin-wall construction attachment device - Google Patents

Abstract

The utility model discloses a metal and plastic mixed thin-wall structure connection device, which comprises a femtosecond laser capable of emitting laser beams, a four-axis motion platform capable of plane movement, which is arranged on the top surface of the four-axis motion platform and can be used for metal workpieces and /or a fixture and a computer that exert a clamping force on the edge of a transparent plastic workpiece; the computer is electrically connected to a femtosecond laser and a four-axis motion platform, and the femtosecond laser emits a laser beam to irradiate the workpiece clamped by the fixture. Compared with the prior art, the technical scheme of the utility model solves the technical problem of welding of dissimilar incompatible materials between plastics and metals, and improves the working reliability and working efficiency of laser connection between metals and plastics.

Description

A metal and plastic hybrid thin-wall structure connecting device

technical field

The utility model relates to the technical field of laser processing, in particular to a metal and plastic mixed thin-wall structure connection device.

Background technique

With the emergence of new materials and new structures, the materials formed by the composite of metal materials and non-metal materials have been greatly developed. In particular, the hybrid structure of plastic and metal has great advantages in technical fields such as medical equipment, packaging industry, auto parts, and electronic device packaging because of its mechanical and physical properties such as light weight and high strength.

In the prior art, bonding, mechanical riveting, NMT technology, brazing and ultrasonic welding are mainly used to connect plastics and metals. Shortcomings such as low production efficiency. Laser processing is used to connect two different types of materials, metal and plastic, because it has better advantages, so it is applied. However, in this process, because the melting points of the two types of materials are quite different, the relative The capacity is low, and it is difficult to form a compound between metal and plastic in the fusion zone; in addition, there is an oxide film on the surface of the metal material, which hinders the combination of two different types of materials, and when plastic and metal are processed and connected, air bubbles are easily generated and there are two kinds of materials Therefore, the structure formed by the connection between the two is unstable.

Therefore, it is of great significance to further optimize the design of the production process that connects metal and plastic through laser processing.

Utility model content

The main purpose of this utility model is to propose a metal and plastic mixed thin-wall structure connection device with simple structure and reliable operation, aiming at solving the technical problem of welding of plastic and metal dissimilar incompatible materials, and improving the laser connection between metal and plastic. work reliability and work efficiency.

In order to achieve the above purpose, the utility model proposes a metal and plastic hybrid thin-walled structure connection device, which includes a femtosecond laser that can emit laser beams, a four-axis motion platform that can perform planar movement, and is arranged on the four-axis motion platform. A fixture and a computer on the top surface that can exert a clamping force on the metal workpiece and/or the edge of a transparent plastic workpiece; the computer is electrically connected to the femtosecond laser and the four-axis motion platform, and the femtosecond laser A laser beam is emitted to irradiate the top surface of the workpiece clamped by the fixture.

Preferably, the four-axis motion platform includes a worktable, an X-axis direction stepping motor that drives the worktable to move along the X-axis direction, and a Y-axis direction stepper motor that drives the worktable to move along the Y-axis direction, so The transmission directions of the stepping motor in the X-axis direction and the stepping motor in the Y-axis direction are perpendicular to each other.

Preferably, the laser beam emitted by the femtosecond laser and irradiated on the top surface of the workpiece is provided with a condenser lens on the path.

Preferably, the laser beam emitted by the femtosecond laser and irradiated on the top surface of the workpiece is provided with a mirror on the path.

Preferably, the computer controls and adjusts the operating parameters of the femtosecond laser including laser power, laser pulse frequency, laser pulse width, and laser output diameter.

Preferably, the working parameters of the femtosecond laser are laser power 2.0-3.0kW, laser pulse frequency 10-24Hz, laser pulse width 10-20ms, and laser output diameter 0-2mm.

Preferably, the working parameters of the femtosecond laser are laser power 0.5-2.0kW, laser pulse frequency 2-10Hz, laser pulse width 3-10ms, and laser output diameter 2-8mm.

The technical scheme of the utility model processes a concave structure, such as a groove or a connection hole, on the surface of a metal workpiece by a femtosecond laser. Then, the transparent plastic workpiece is placed on the top surface of the processed metal workpiece, and the femtosecond laser emits a laser beam to irradiate the surface of the metal workpiece again, so that the top surface of the metal workpiece is heated and then transferred to the bottom surface of the transparent plastic workpiece, so that the bottom surface of the transparent plastic workpiece It becomes molten and flows into the concave structure on the top surface of the metal workpiece. After cooling, a tightly connected structure is formed between the metal workpiece and the transparent plastic workpiece. The technical scheme of the utility model can reduce the overall weight, realize energy saving and emission reduction, and adopt a mixed structure of metal and plastic at the same time, and do not need to make large-scale adjustments to the original manufacturing equipment and production technology, so the economic benefit is good and it has a wide range of applications. scope of application.

In the technical scheme of the utility model, the computer controls the stepping motor in the X-axis direction and the stepping motor in the Y-axis direction to drive the workbench to move along the X-axis direction and the Y-axis direction, so as to adjust the processing position of the workbench to meet the needs of metal workpieces. Processing in different positions.

In the technical solution of the utility model, a focusing mirror is arranged to focus the laser beam on the surface of the metal workpiece to be processed, so that the laser beam light emitted by the femtosecond laser can be more concentrated on the surface of the metal workpiece. A mirror is installed on the propagation path of the laser element to reflect the laser beam to meet the processing of different positions of the metal workpiece. In addition, a shielding gas, such as argon gas, can be provided at the metal workpiece processing position to protect the laser beam from oxidation reaction on the surface of the workpiece when processing the metal workpiece.

Compared with the riveting technology, the metal and plastic mixed thin-wall structure connection device and connection method of the utility model have better sealing performance, lower cost and save time and labor, and solve the problem of larger volume and thicker thickness in the riveting method. Technical problem, it can be applied to connect metal workpieces with thinner thickness and smaller volume with plastic workpieces, and the surface treatment method of metal workpieces is simpler, which can improve the working efficiency of welding connection.

Compared with the bonding technology, the technical solution of the utility model solves the technical problems of weak bonding, long curing time and long-term effectiveness in the bonding solution, which can improve production efficiency and improve the structural strength of the welding joint. Compared with the traditional brazing technology, the technical solution of the utility model uses laser welding to make the molten pool and the heat-affected zone smaller, which can realize precise welding and connection, and overcome the technical problem of thermal deformation in the prior art, and The technical solution of the utility model has the advantages of environmental protection, stronger applicability, and the like. Compared with the NMT technology, the technical solution of the utility model solves the technical problems of limited connection strength, unenvironmental protection of the chemical process, and incapable of partial surface treatment. To sum up, the technical solution of the utility model is suitable for welding connection between various plastic workpieces and metal workpieces, can greatly improve the automation degree of manufacturing technology, and conforms to the current trend of green manufacturing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is the structural representation of the utility model metal and plastic mixed thin-walled structure connecting device;

Fig. 2 is the structural representation of the four-axis motion platform of the utility model;

Fig. 3 is a schematic diagram of the connection relationship between the transparent plastic workpiece and the metal workpiece in an embodiment of the utility model;

Fig. 4 is a schematic diagram of the connection relationship between the transparent plastic workpiece and the metal workpiece in another embodiment of the utility model;

Fig. 5 is a partial sectional view of the transparent plastic workpiece and the metal workpiece in Fig. 3;

Fig. 6 is a partial cross-sectional view of the transparent plastic workpiece and the metal workpiece in Fig. 4 .

Explanation of reference numbers:

label name label name 1 femtosecond laser 7 metal workpiece 2 Reflector 71 connection hole 3 Laser beam 72 groove 4 fixture 8 computer 5 Four-axis motion platform 9 Condenser 6 Transparent plastic workpiece

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the relative positional relationship, movement conditions, etc. between the components shown in the figure below are changed, if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The utility model provides a metal and plastic mixed thin-wall structure connection device.

Referring to Fig. 1 and Fig. 2, the metal and plastic mixed thin-walled structure connecting device in the embodiment of the present invention includes a femtosecond laser 1 that can emit a laser beam 3, a four-axis motion platform 5 that can move in a plane, and is arranged on four The top surface of the axis motion platform 5 and the fixture 4 and computer 8 that can apply clamping force to the metal workpiece 7 and/or the edge of the transparent plastic workpiece 6; the computer 8 is electrically connected to the femtosecond laser 1 and the four-axis motion platform 5 respectively, The femtosecond laser 1 emits a laser beam 3 to irradiate the top surface of the workpiece clamped by the fixture 4 .

In the embodiment of the utility model, the four-axis motion platform 5 includes a workbench and a stepping motor in the X-axis direction that drives the workbench to move along the X-axis direction, and a stepper motor in the Y-axis direction that drives the workbench to move along the Y-axis direction. The transmission directions of the direction stepper motor and the Y-axis direction stepper motor are perpendicular to each other.

In the embodiment of the present invention, the laser beam 3 emitted by the femtosecond laser 1 and irradiated on the top surface of the workpiece is provided with a condenser lens 9 on the path. Preferably, the laser beam 3 emitted by the femtosecond laser 1 and irradiated on the top surface of the workpiece is provided with a mirror 2 on the path.

In the embodiment of the utility model, the computer 8 controls and adjusts the working parameters of the femtosecond laser 1 including laser power, laser pulse frequency, laser pulse width, and laser output diameter.

In the embodiment of the utility model, the working parameters when the femtosecond laser 1 processes the groove structure of the metal workpiece 7 are laser power 2.0-3.0 kW, laser pulse frequency 10-24 Hz, laser pulse width 10-20 ms, laser output diameter 0 -2mm.

In the embodiment of the utility model, when the femtosecond laser 1 acts on the metal workpiece 7 and the transparent plastic workpiece 6, the working parameters are: laser power 0.5-2.0kW, laser pulse frequency 2-10Hz, laser pulse width 3-10ms, laser output light 2-8mm in diameter.

The working principle of the connection method using the metal and plastic mixed thin-walled structure connection device in the embodiment of the utility model is as follows:

First, the plate-shaped metal workpiece 7 and the transparent plastic workpiece 6 to be processed are polished respectively, wherein the pollutants on the surface of the metal workpiece 7 can be polished and removed with sandpaper, and then the metal workpiece 7 is placed in deionized water for ultrasonic cleaning for 10-20 minutes , remove impurities on the surface of the metal workpiece 7, keep the surface of the metal workpiece 7 clean and without any impurities, and finally take out the metal workpiece 7 and perform drying treatment. In addition, the transparent plastic workpiece 6 is placed in deionized water and ultrasonically cleaned for 10-20 minutes to remove impurities on the surface of the transparent plastic workpiece 6, and finally the transparent plastic workpiece 6 is taken out and dried, and finally the metal workpiece 7 and the transparent plastic workpiece 6 are in contact with each other surfaces are flat.

The metal workpiece 7 after cleaning and drying is placed on the top surface of the four-axis motion platform 5 and the top edge of the metal workpiece 7 is clamped and fixed by the clamp 4 . The operating parameters of the femtosecond laser 1 are adjusted through the computer 8, specifically, the parameters include laser power 2.0-3.0kW, laser pulse frequency 10-24Hz, laser pulse width 10-20ms, and laser output diameter 0-2mm. The femtosecond laser 1 is controlled by the computer 8 to emit the laser beam 3 and irradiate the laser beam 3 vertically on the top surface of the metal workpiece 7. The position of the metal workpiece 7 irradiated by the laser beam 3 produces a concave structure according to the principle of laser deep penetration welding. , and the recessed structure in this embodiment is a connecting hole 71 , in other embodiments of the present utility model, the recessed structure can be a groove 72 . The computer 8 controls the stepping motor in the X-axis direction and the stepping motor in the Y-axis direction to drive the workbench to move in the X-axis direction or the Y-axis direction respectively, and the femtosecond laser 1 can move up and down in the Z-axis direction to adjust the laser beam 3 The size of the light spot makes a plurality of connection holes 71 with a certain arrangement regularity formed on the top surface of the metal workpiece 7 in the embodiment of the present invention along the edge direction.

After the metal workpiece 7 is processed, the metal workpiece 7 and the transparent plastic workpiece 6 are sequentially clamped on the top surface of the workbench by clamps from bottom to top, and it is necessary to ensure that the transparent plastic workpiece 6 and the metal workpiece 7 are closely attached to each other. The operating parameters of the femtosecond laser 1 are adjusted through the computer 8, specifically, the parameters include laser power 0.5-2.0kW, laser pulse frequency 2-10Hz, laser pulse width 3-10ms, and laser output diameter 2-8mm. The femtosecond laser 1 is controlled by the computer 8 to emit a laser beam and irradiate the transparent plastic workpiece 6. The laser beam 3 passes through the transparent plastic workpiece 6 and irradiates the top surface of the metal workpiece 7, and the laser beam 3 moves along the processing path of the original connection hole 71. . Thus, the laser beam 3 makes the top surface of the metal workpiece 7 absorb heat and generate heat, and the heat on the surface of the metal workpiece 7 is transferred to the bottom surface of the transparent plastic workpiece 6 . Because the material of transparent plastic workpiece 6 can be polypropylene (PP), polyamide (PA), polypropylene (PET), so transparent plastic workpiece 6 and the bottom surface of metal workpiece 7 closely bond together take place melting phenomenon, pass clamp 4 A certain pressure is applied to the transparent plastic workpiece 6 , so that the transparent plastic workpiece 6 is pressed against the surface of the metal workpiece 7 , and the liquid plastic in a molten state enters the connecting hole 71 on the surface of the metal workpiece 7 . After the metal workpiece 7 and the transparent plastic workpiece 6 are cooled, the metal workpiece 7 and the transparent plastic workpiece 6 will be connected to form an integrated structure.

The technical scheme of the utility model is suitable for thinner processing materials, so the metal workpiece 7 and the transparent plastic workpiece 7 in this implementation are both thin plates, and the thickness of the transparent plastic workpiece 6 is greater than that of the metal workpiece 7 .

The technical scheme of the utility model first processes a concave structure, such as a groove 72 or a connecting hole 71, on the surface of the metal workpiece 7 by the femtosecond laser 1 . Then, the transparent plastic workpiece 6 is placed on the top surface of the processed metal workpiece 7, and the femtosecond laser 1 emits the laser beam 3 again to irradiate the surface of the metal workpiece 7, so that the top surface of the metal workpiece 7 is heated and then transferred to the transparent plastic workpiece 6 bottom surface, so that the bottom surface of the transparent plastic workpiece 6 becomes molten and flows into the concave structure on the top surface of the metal workpiece 7, and a closely connected structure is formed between the metal workpiece 7 and the transparent plastic workpiece 6 after cooling.

The technical scheme of the utility model can reduce the overall weight, realize energy saving and emission reduction, and adopt a mixed structure of metal and plastic at the same time, and do not need to make large-scale adjustments to the original manufacturing equipment and production technology, so the economic benefit is good and it has a wide range of applications. scope of application.

Compared with the riveting technology, the metal and plastic mixed thin-wall structure connection device and connection method of the utility model have better sealing performance, lower cost and save time and labor, and solve the problem of larger volume and thicker thickness in the riveting method. Technical problem, it can be applied to connect metal workpieces with thinner thickness and smaller volume with plastic workpieces, and the surface treatment method of metal workpieces is simpler, which can improve the working efficiency of welding connection.

Compared with the bonding technology, the technical solution of the utility model solves the technical problems of weak bonding, long curing time and long-term effectiveness in the bonding solution, which can improve production efficiency and improve the structural strength of the welding joint.

Compared with the traditional brazing technology, the technical solution of the utility model uses laser welding to make the molten pool and the heat-affected zone smaller, and can realize precise welding and connection, which overcomes the technical problem that is easy to cause thermal deformation in the prior art, and The technical solution of the utility model has the advantages of environmental protection, stronger applicability, and the like.

Compared with the NMT technology, the technical solution of the utility model solves the technical problems of limited connection strength, unenvironmental protection of the chemical process, and incapable of partial surface treatment.

To sum up, the technical solution of the utility model is suitable for welding connection between various plastic workpieces and metal workpieces, can greatly improve the automation degree of manufacturing technology, and conforms to the current trend of green manufacturing.

In addition, in the embodiment of the present invention, by placing the transparent plastic workpiece 6 on the top surface of the metal workpiece 7, the oxidation of the metal surface and the deformation caused by the stress after the surface of the metal workpiece 7 is heated can be avoided under low energy density.

In the embodiment of the utility model, after the femtosecond laser 1 emits the laser beam 3, the laser beam is focused on the surface of the metal workpiece 7 to be processed through the focusing mirror 9, so that the laser beam 3 light emitted by the femtosecond laser 1 can be more concentrated on the The surface of the metal workpiece 7. In addition, the side of the laser head of the femtosecond laser 1 can be provided with a shielding gas such as argon gas for protection, which can protect the laser beam from oxidation reaction on the surface of the workpiece 7 when processing the metal workpiece 7 .

The above are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Under the conception of the present utility model, the equivalent structural transformations made by using the specification of the utility model and the contents of the accompanying drawings, or directly /Indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims (5)

1. A metal and plastic mixed thin-walled structure connecting device, is characterized in that, comprises the femtosecond laser that can emit laser beam, the four-axis motion platform that can carry out planar motion, is arranged on the top surface of described four-axis motion platform and can A fixture and a computer that exert a clamping force on the edge of a metal workpiece and/or a transparent plastic workpiece; the computer is electrically connected to the femtosecond laser and the four-axis motion platform, and the femtosecond laser emits a laser beam to irradiate on the top surface of the workpiece clamped by the fixture. 2. The metal and plastic mixed thin-wall structure connection device according to claim 1, wherein the four-axis motion platform includes a worktable and an X-axis direction stepping motor that drives the workbench to move along the X-axis direction and a Y-axis direction stepping motor that drives the worktable to move along the Y-axis direction, the transmission directions of the X-axis direction stepping motor and the Y-axis direction stepping motor are perpendicular to each other. 3. The metal-plastic mixed thin-walled structure connecting device according to claim 1, characterized in that, the laser beam emitted by the femtosecond laser and irradiated on the top surface of the workpiece is provided with a condenser lens on the path. 4. The metal-plastic hybrid thin-walled structure connection device according to claim 3, characterized in that, the laser beam emitted by the femtosecond laser and irradiated on the top surface of the workpiece is provided with a reflector on the path. 5. The metal and plastic mixed thin-wall structure connection device according to claim 1, wherein the computer controls and adjusts the operating parameters of the femtosecond laser including laser power, laser pulse frequency, laser pulse width, laser Light diameter.