Connecting structure, fixed loading table, welding equipment and welding process

Abstract

The invention discloses a metal and carbon fiber thermoplastic composite material connecting structure, a fixed loading table, welding equipment and a welding process. The connection structure of the metal and the carbon fiber thermoplastic composite material comprises a metal connection strengthening structure, a metal plate, a carbon fiber thermoplastic composite material plate, a Z-shaped structure, a positioning step, a first welding surface, a second welding surface, a metal plate welding surface, a first area and a second area, the second welding face is connected with the first face of the carbon fiber thermoplastic composite material plate in a welded mode, and the second area is connected with the second face of the carbon fiber thermoplastic composite material plate in a welded mode. The fixed loading platform comprises an upper fixed loading platform and a lower fixed loading platform; the welding equipment comprises a fixed loading table, laser welding equipment and a load applying mechanism. According to the method, the connection strength, stability and reliability of the metal and carbon fiber thermoplastic composite material are improved, the welding accuracy and welding quality are improved, and the performance consistency of the connector is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of connection between metal materials and carbon fiber thermoplastic composite materials, in particular to a connection structure of metal and carbon fiber thermoplastic composite materials, a fixed loading platform, welding equipment and a welding process. Background Art

[0002] Carbon fiber thermoplastic composites are a type of carbon fiber reinforced polymer composites. Their high specific strength, excellent weather resistance and low density make them one of the best candidate materials for energy saving and efficiency improvement of transportation vehicles, and they show extremely attractive application prospects in the fields of transportation, sea, air and aerospace. Although carbon fiber thermoplastic composites show excellent performance and broad application prospects, there are still many problems in completely replacing existing metal structures. The replacement of some parts is an important means to promote the application of carbon fiber thermoplastic composites and improve the energy efficiency of existing vehicles. At present, carbon fiber thermoplastic composites have been widely used in the latest large passenger aircraft, significantly reducing flight energy consumption. However, how to achieve the connection between carbon fiber thermoplastic composites and existing metal components of vehicles is still a big problem.

[0003] At present, the commonly used connection method is riveting, which can realize the connection between carbon fiber thermoplastic composites and metal components at any time, but the dense riveting holes will destroy the continuity of the carbon fiber, causing the failure to expand outward along the riveting holes, reducing the bearing capacity of the carbon fiber. Although the gluing process will not destroy the structural continuity of the carbon fiber thermoplastic composite, the bonding force of the adhesive layer is low and it is easy to age, making it difficult to cope with applications under high load conditions. Relatively speaking, laser connection shows a more promising effect. It does not need to destroy the structural continuity of the carbon fiber thermoplastic composite, and can achieve a dense connection at the interface. However, the huge differences in material structure and physical and chemical properties between metals and carbon fiber thermoplastic composites make it difficult to form molecular or atomic bonds at the connection interface, making it impossible to obtain high connection strength.

[0004] Moreover, a single lap joint is prone to shear effect during stress, which can easily lead to failure of the connection interface. Therefore, it is very meaningful to optimize the joint structure of metal and carbon fiber thermoplastic composites and develop more reasonable auxiliary devices and supporting processes, which can further improve the connection strength of metal and carbon fiber thermoplastic composites.

[0005] Although the prior art discloses some laser welding methods for metal and carbon fiber thermoplastic composites, it does not solve the failure mode of the joints, nor does it achieve an exponential increase in strength. In addition, the related pressure loading is not uniform enough, and the positioning of the components is not precise, making it impossible to achieve high-quality and efficient processing of metal and carbon fiber thermoplastic composites.

[0006] In summary, the existing technology has technical defects such as insufficient connection strength between metal and carbon fiber thermoplastic composite materials, prone to connection failure, insufficient stability and reliability, etc., and these defects seriously limit the further development and promotion and application of this field.

[0007] In view of this, the purpose of the present invention is to provide a new technical solution to solve the existing technical problems. Summary of the invention

[0008] In order to overcome the shortcomings of the prior art, the present invention provides a connection structure, a fixed loading platform, a welding device and a welding process for metal and carbon fiber thermoplastic composite materials, which effectively solve the technical defects of the existing metal and carbon fiber thermoplastic composite connection technology, such as insufficient connection strength, easy connection failure, insufficient stability and reliability.

[0009] The technical solution adopted by the present invention to solve its technical problem is:

[0010] A connection structure of metal and carbon fiber thermoplastic composite material, comprising a metal connection reinforcement structure, a metal plate and a carbon fiber thermoplastic composite material plate, wherein the metal connection reinforcement structure is a Z-shaped structure, the Z-shaped structure forms a positioning step, a first welding surface and a second welding surface on the metal connection reinforcement structure, the metal plate has a metal plate welding surface, the metal plate welding surface has a first area and a second area, the carbon fiber thermoplastic composite material plate is positioned at the positioning step of the metal connection reinforcement structure and is located between the metal connection reinforcement structure and the metal plate, the first welding surface of the metal connection reinforcement structure is welded to the first area on the metal plate welding surface of the metal plate, the second welding surface of the metal connection reinforcement structure is welded to the first surface of the carbon fiber thermoplastic composite material plate, and the second area on the metal plate welding surface of the metal plate is welded to the second surface of the carbon fiber thermoplastic composite material plate.

[0011] As a further improvement of the above technical solution, micro-groove textures are provided on the second welding surface of the metal connection strengthening structure and the second area on the metal plate welding surface of the metal plate.

[0012] As a further improvement of the above technical solution, the spacing of the micro-groove texture on the second welding surface and the second area on the welding surface of the metal plate is 30-80 μm, the width is 10-50 μm, and the depth is 15-150 μm.

[0013] As a further improvement of the above technical solution, the metal connection reinforcement structure and the metal plate are made of aluminum alloy or magnesium alloy, and have a thickness of 2-8 mm.

[0014] As a further improvement of the above technical solution, the carbon fiber thermoplastic composite material plate is one of polyamide, polyaryletherketone and polyimide reinforced with continuous carbon fibers, and the thickness of the carbon fiber thermoplastic composite material plate ranges from 2 to 8 mm.

[0015] As a further improvement of the above technical solution, the step height of the positioning step on the metal connection reinforcement structure is the same as the thickness of the carbon fiber thermoplastic composite material plate.

[0016] As a further improvement of the above technical solution, the mutual welding connection between the metal connection reinforcement structure, the metal plate and the carbon fiber thermoplastic composite material plate is achieved by laser welding.

[0017] As a further improvement of the above technical solution, a polymer film is arranged between the second welding surface of the metal connection reinforcement structure and the first surface of the carbon fiber thermoplastic composite material plate and between the second area of ​​the metal plate welding surface and the second surface of the carbon fiber thermoplastic composite material plate.

[0018] The present invention also provides:

[0019] A fixed loading platform for metal and carbon fiber thermoplastic composite materials, the fixed loading platform is used to realize fixed loading of the connection structure of the metal and carbon fiber thermoplastic composite materials, and comprises an upper fixed loading platform and a lower fixed loading platform, wherein the upper fixed loading platform is used to fix the metal connection reinforcement structure, and the lower fixed loading platform is used to fix the metal plate. The upper fixed loading platform is provided with an upper loading platform first welding cavity and an upper loading platform second welding cavity, and the lower fixed loading platform is provided with a lower loading platform first welding cavity. The upper loading platform first welding cavity is used to weld the first welding surface of the metal connection reinforcement structure to the first area on the welding surface of the metal plate, and the upper loading platform second welding cavity is used to weld the second welding surface of the metal connection reinforcement structure to the first surface of the carbon fiber thermoplastic composite plate. The lower loading platform first welding cavity is used to weld the second area of ​​the metal welding surface to the second surface of the carbon fiber thermoplastic composite plate.

[0020] As a further improvement of the above technical solution, an upper protective gas delivery pipeline is arranged inside the upper fixed loading platform, and the upper protective gas delivery pipeline is connected to an external protective gas delivery source and communicated with the first welding cavity of the upper loading platform and the second welding cavity of the upper loading platform;

[0021] A lower protective gas delivery pipeline is disposed inside the lower fixed loading platform, and the lower protective gas delivery pipeline is connected to an external protective gas delivery source and communicated with the first welding cavity of the lower loading platform.

[0022] As a further improvement of the above technical solution, the upper fixed loading platform has a loading surface and the loading surface of the upper fixed loading platform is a special-shaped surface whose shape is adapted to the metal connection reinforcement structure, and the lower fixed loading platform has a loading surface and the loading surface of the lower fixed loading platform is a special-shaped surface whose shape is adapted to the metal plate.

[0023] As a further improvement of the above technical solution, the loading surface of the upper fixed loading platform is provided with an upper positioning recess, and the upper positioning recess is formed with an upper loading platform positioning boss on the upper fixed loading platform, and the upper positioning recess and the upper loading platform positioning boss are used to position the metal connection reinforcement structure, and the loading surface of the lower fixed loading platform is provided with a lower positioning recess, and the lower positioning recess is formed with a lower loading platform positioning boss on the lower fixed loading platform, and the lower positioning recess and the lower loading platform positioning boss are used to position the metal plate.

[0024] The present invention also provides:

[0025] A welding device for metal and carbon fiber thermoplastic composite materials, including the fixed loading platform of the metal and carbon fiber thermoplastic composite materials, and also including laser welding equipment and a load applying mechanism used in conjunction with the fixed loading platform of the metal and carbon fiber thermoplastic composite materials, wherein the fixed loading platform of the metal and carbon fiber thermoplastic composite materials is used to realize the fixed loading work of the connection structure of the metal and carbon fiber thermoplastic composite materials, the laser welding equipment is used to realize the mutual welding connection of the metal connection reinforcement structure, the metal plate and the carbon fiber thermoplastic composite material plate, and the load applying mechanism is used to apply a preset load between the upper fixed loading platform and the lower fixed loading platform.

[0026] As a further improvement of the above technical solution, it also includes a matching robot, which is used to realize the automatic operation of the upper fixed loading platform, the lower fixed loading platform and the laser welding equipment.

[0027] As a further improvement of the above technical solution, the manipulator includes a loading platform manipulator, and the loading platform manipulator includes an upper loading platform manipulator and a lower loading platform manipulator. The upper loading platform manipulator and the lower loading platform manipulator are respectively fixedly connected to the upper fixed loading platform and the lower fixed loading platform and are respectively used to drive the upper fixed loading platform and the lower fixed loading platform to move.

[0028] As a further improvement of the above technical solution, the manipulator includes a laser welding equipment manipulator, the laser welding equipment manipulator includes a first laser welding equipment manipulator, a second laser welding equipment manipulator and a third laser welding equipment manipulator, the laser welding equipment includes a first laser welding equipment, a second laser welding equipment and a third laser welding equipment, the first laser welding equipment is installed on the first laser welding equipment manipulator, the second laser welding equipment is installed on the second laser welding equipment manipulator, the third laser welding equipment is installed on the third laser welding equipment manipulator, the first laser welding equipment manipulator is used to drive the first laser welding equipment to perform laser welding in the first welding cavity of the upper loading platform, the second laser welding equipment manipulator is used to drive the second laser welding equipment to perform laser welding in the second welding cavity of the upper loading platform, and the third laser welding equipment manipulator is used to drive the third laser welding equipment to perform laser welding in the first welding cavity of the lower loading platform.

[0029] As a further improvement of the above technical solution, the load pressure applied by the load applying mechanism to the upper fixed loading platform and the lower fixed loading platform is adjustable, and the adjustment range of the load pressure is 1000N-5000N.

[0030] As a further improvement of the above technical solution, when the laser welding equipment performs welding work between the first welding surface of the metal connection reinforcement structure and the first area of ​​the metal plate welding surface of the metal plate, the power of the laser welding equipment is 4000-10000W and the scanning speed is 10-30mm / s.

[0031] As a further improvement of the above technical solution, when the laser welding equipment performs welding work between the second welding surface of the metal connection reinforcement structure and the first surface of the carbon fiber thermoplastic composite plate and between the metal plate welding surface of the metal plate and the second surface of the carbon fiber thermoplastic composite plate, the power of the laser welding equipment is 60-150W, the frequency is 1000-2000Hz, the pulse width is 72ns, the wavelength is 1064nm, and the scanning speed is 2-20mm / s.

[0032] The present invention also provides:

[0033] A welding process of metal and carbon fiber thermoplastic composite material, using the welding equipment of metal and carbon fiber thermoplastic composite material to complete the welding work, comprises the following steps:

[0034] Step 1: Positioning the components, pre-setting the metal plate on the lower fixed loading platform, aligning the upper fixed loading platform with the metal connection reinforcement structure pre-set with the lower fixed loading platform through the position of the metal plate limited by the lower fixed loading platform, pre-setting a gap between the upper fixed loading platform and the lower fixed loading platform, placing the carbon fiber thermoplastic composite material plate in the gap between the upper fixed loading platform and the lower fixed loading platform, and limiting the metal connection reinforcement structure through the upper fixed loading platform;

[0035] Step 2: Loading pressure. After positioning is completed, the upper fixed loading platform and the lower fixed loading platform are loaded with pressure by the cylinder load applying mechanism, so that the metal connection reinforcement structure, the metal plate and the carbon fiber thermoplastic composite material plate 3 are tightly pressed together;

[0036] Step 3: Laser welding, respectively setting laser welding process parameters between the metal connection reinforcement structure and the metal plate and between the metal connection reinforcement structure, the metal plate and the carbon fiber thermoplastic composite material plate, and performing welding at a specified speed and output power through a laser welding device controlled by a manipulator;

[0037] Step 4: Unloading. After the laser welding equipment completes the welding work, the upper fixed loading platform is unloaded and moved away to complete the reinforced connection of metal and carbon fiber thermoplastic composite materials.

[0038] As a further improvement of the above technical solution, the load pressure applied by the load applying mechanism to the upper fixed loading platform and the lower fixed loading platform is adjustable, and the adjustment range of the load pressure is 1000N-5000N.

[0039] As a further improvement of the above technical solution, when the laser welding equipment performs welding work between the first welding surface of the metal connection reinforcement structure and the first area of ​​the metal plate welding surface of the metal plate, the power of the laser welding equipment is 4000-10000W and the scanning speed is 10-30mm / s.

[0040] As a further improvement of the above technical solution, when the laser welding equipment performs welding work between the second welding surface of the metal connection reinforcement structure and the first surface of the carbon fiber thermoplastic composite plate and between the metal plate welding surface of the metal plate and the second surface of the carbon fiber thermoplastic composite plate, the power of the laser welding equipment is 60-150W, the frequency is 1000-2000Hz, the pulse width is 72ns, the wavelength is 1064nm, and the scanning speed is 2-20mm / s.

[0041] As a further improvement of the above technical solution, before the carbon fiber thermoplastic composite material plate is placed in the gap between the upper fixed loading platform and the lower fixed loading platform, a polymer film is provided on the first surface and the second surface of the carbon fiber thermoplastic composite material plate.

[0042] The beneficial effects of the present invention are as follows: the present invention provides a connection structure of metal and carbon fiber thermoplastic composite material, a fixed loading platform, welding equipment and welding process, which realizes the connection of metal connection reinforcement structure, metal plate and carbon fiber thermoplastic composite material plate through the connection structure of metal and carbon fiber thermoplastic composite material, and realizes the processing of the connection structure of metal plate and carbon fiber thermoplastic composite material plate through the fixed loading platform, welding equipment and welding process. It has the following advantages:

[0043] 1. Improve the connection strength of metal and carbon fiber thermoplastic composite materials, improve the structural stability of the connector, and improve its failure resistance;

[0044] 2. Solve the accuracy of welding position and the quality of welding surface to ensure the performance consistency of the joints of metal and carbon fiber thermoplastic composite materials;

[0045] 3. Based on the overall uniform pressurization of the upper and lower fixed loading platforms, the precise limitation of the welding area, the reasonable interface micro-groove texture and the laser welding process, the interface welding of metal and metal can be completed quickly; and the reasonable discharge of air from the connection interface of metal and carbon fiber thermoplastic composite materials can be achieved, and the molten polymer matrix can be effectively squeezed into the micro-groove gap to obtain a high-performance double-sided connection reinforcement joint, thereby obtaining a connection reinforcement structure of metal and carbon fiber thermoplastic composite materials.

[0046] 4. The process is simple and can be processed automatically. The upper and lower fixed loading platforms have simple structures and are easy to prepare and replace, making them suitable for industrial mass production.

[0047] In summary, this type of metal and carbon fiber thermoplastic composite connection structure, fixed loading platform, welding equipment and welding process effectively solve the technical defects of existing metal and carbon fiber thermoplastic composite connection technology, such as insufficient connection strength, easy connection failure, insufficient stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0049] Figure 1 It is a schematic diagram of the assembly of the connection structure of the metal and carbon fiber thermoplastic composite material in the present invention;

[0050] Figure 2 It is a schematic diagram of the metal connection strengthening structure in the present invention;

[0051] Figure 3 Schematic diagram of the microstructure of the microgroove texture in the present invention;

[0052] Figure 4 It is a schematic diagram of the assembly of a fixed loading platform of a metal and carbon fiber thermoplastic composite material in the present invention;

[0053] Figure 5 It is a structural schematic diagram of the lower fixed loading platform in the present invention. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other, refer to Figure 1-5 .

[0055] The inventors have found that for the laser connection technology of metal and carbon fiber thermoplastic composite materials, the high temperature and high pressure of the connection interface can improve the fluidity of the molten polymer matrix, thereby improving the filling of the surface micro-texture voids by the polymer material, but the high temperature will cause residual internal stress of the metal and decomposition of the polymer material, resulting in an increase in interface pores and a decrease in the stability of the connection interface. Secondly, the uneven distribution of pressure will also lead to the unevenness of the molten polymer material, reducing the consistency of the connection interface performance. Although the ultrasonic treatment, rolling ball pressurization and other processes disclosed in the relevant technology can improve the welding interface, it is still impossible to achieve the uniformity and controllability of the pressure of the welding interface, but it affects the quality consistency of the connector and increases the difficulty of operation. The most critical thing is that the above process cannot achieve a significant increase in the strength of the joints of metal and carbon fiber thermoplastic composite materials, nor can it improve the problem that the connector is susceptible to shear failure.

[0056] In order to solve the existing technical problems, the present invention provides: a connection structure of metal and carbon fiber thermoplastic composite material.

[0057] Specific reference Figure 1 , Figure 2 , Figure 3A connection structure of metal and carbon fiber thermoplastic composite material, comprising a metal connection reinforcement structure 1, a metal plate 2 and a carbon fiber thermoplastic composite material plate 3, wherein the metal connection reinforcement structure 1 is a Z-shaped structure, the Z-shaped structure forms a positioning step 13, a first welding surface 11 and a second welding surface 12 on the metal connection reinforcement structure 1, the metal plate 2 has a metal plate welding surface 21, the metal plate welding surface 21 has a first area and a second area, the carbon fiber thermoplastic composite material plate 3 is positioned at the positioning step 13 of the metal connection reinforcement structure 1 and is located between the metal connection reinforcement structure 1 and the metal plate 2, the first welding surface 11 of the metal connection reinforcement structure 1 is welded to the first area on the metal plate welding surface 21 of the metal plate 2, the second welding surface 12 of the metal connection reinforcement structure 1 is welded to the first surface of the carbon fiber thermoplastic composite material plate 3, and the second area on the metal plate welding surface 21 of the metal plate 2 is welded to the second surface of the carbon fiber thermoplastic composite material plate 3. The second welding surface 12 of the metal connection reinforcement structure 1 and the second area on the metal plate welding surface 21 of the metal plate 2 are both provided with a micro-groove texture 4 .

[0058] Most of the current connection technologies use a single-sided overlap connection method. This single-sided overlap connection structure is prone to shear effect when subjected to force, thereby causing rapid failure of the joint. The present invention can connect both sides of the carbon fiber thermoplastic composite material plate 3 to metal at the same time through a metal connection reinforcement structure 1, thereby changing the force effect of the connection head of the metal and carbon fiber thermoplastic composite material, better utilizing the interlocking effect of the surface micro-groove texture 4 and the molten polymer material, and significantly improving the strength of the joint.

[0059] The surface area of ​​the connection interface can be increased by means of surface microtexture, so the microgroove texture 4 can improve the mechanical interlocking effect between the molten matrix of the carbon fiber thermoplastic composite material and the metal. In addition, the microgrooves of the surface microtexture will further strengthen the mechanical interlocking effect. Due to the rapid temperature rise of the interface during the laser connection process, the gas that cannot be discharged by pre-pressing will gather into bubbles. These bubble defects will reduce the compactness and continuity of the connection interface, which is harmful to the connection strength of the metal and the carbon fiber thermoplastic composite material. Therefore, it is very important to effectively eliminate the bubbles at the connection interface to further improve the connection strength of the metal and the carbon fiber thermoplastic composite material. Although the preset microgrooves will also store some air, during the laser connection process of the metal and the carbon fiber thermoplastic composite material, the rapid temperature rise of the metal will cause the air in the microgrooves to expand rapidly. The surplus air after expansion will be discharged along the connected microgrooves, and the subsequent cooling will cause the air in the microgrooves to shrink, which is conducive to the molten polymer matrix to squeeze into the microgrooves, and also conducive to the migration of the interface gas into the microgrooves, thereby improving the joint strength.

[0060] In this embodiment, the micro-groove texture 4 on the second welding surface 12 and the second region on the metal plate welding surface 21 has a pitch of 30-80 μm, a width of 10-50 μm, and a depth of 15-150 μm.

[0061] The metal surface microgroove texture is a nearly connected structure, which is more conducive to the partial discharge of air under pressure assistance during laser welding compared to the separate groove and protrusion microstructures, thereby reducing the filling and intrusion of bubbles and molten polymer matrix at the connection interface, and no other auxiliary facilities are required. Specifically, the microgroove shape is a continuous or semi-continuous nearly rectangular, nearly cylindrical and wedge-like structure.

[0062] In some embodiments, the metal connection reinforcement structure 1 and the metal plate 2 are made of aluminum alloy or magnesium alloy, and the thickness thereof is 2-8 mm.

[0063] In some embodiments, the carbon fiber thermoplastic composite material plate 3 is one of polyamide, polyaryletherketone, and polyimide reinforced with continuous carbon fibers, and the thickness of the carbon fiber thermoplastic composite material plate 3 is in the range of 2-8 mm.

[0064] In some embodiments, the step height of the positioning step 13 on the metal connection reinforcement structure 1 is the same as the thickness of the carbon fiber thermoplastic composite plate 3 .

[0065] In some embodiments, the metal connection reinforcement structure 1, the metal plate 2 and the carbon fiber thermoplastic composite material plate 3 are welded to each other by laser welding.

[0066] In some embodiments, a polymer film 5 is disposed between the second welding surface 12 of the metal connection reinforcement structure 1 and the first surface of the carbon fiber thermoplastic composite material plate 3 and between the second region of the metal plate welding surface 21 and the second surface of the carbon fiber thermoplastic composite material plate 3.

[0067] Based on the above-mentioned connection structure of metal and carbon fiber thermoplastic composite material, the present invention also provides:

[0068] Reference Figure 4 , Figure 5, a fixed loading platform for metal and carbon fiber thermoplastic composite material, the fixed loading platform is used to realize the fixed loading of the connection structure of the metal and carbon fiber thermoplastic composite material, and comprises an upper fixed loading platform 61 and a lower fixed loading platform 62, wherein the upper fixed loading platform 61 is used to fix the metal connection reinforcement structure 1, and the lower fixed loading platform 62 is used to fix the metal plate 2, the upper fixed loading platform 61 is provided with an upper loading platform first welding cavity 611 and an upper loading platform second welding cavity 612, the lower fixed loading platform 62 is provided with a lower loading platform first welding cavity 621, the upper loading platform first welding cavity 611 is used to weld the first welding surface 11 of the metal connection reinforcement structure 1 with the first area on the welding surface 21 of the metal plate, the upper loading platform second welding cavity 612 is used to weld the second welding surface 12 of the metal connection reinforcement structure 1 with the first surface of the carbon fiber thermoplastic composite plate 3, and the lower loading platform first welding cavity 621 is used to weld the second area of ​​the metal welding surface 21 with the second surface of the carbon fiber thermoplastic composite plate 3.

[0069] The positions of the welding cavities of the upper and lower fixed loading platforms correspond to each other to ensure that the laser connection positions of the metal connection reinforcement structure 1 and the metal plate 2 with the carbon fiber thermoplastic composite material plate 3 are symmetrical along the center to ensure the welding quality.

[0070] An upper protective gas delivery pipeline is provided inside the upper fixed loading platform 61, and the upper protective gas delivery pipeline is connected to an external protective gas delivery source and communicates with the first welding chamber 611 and the second welding chamber 612 of the upper loading platform;

[0071] A lower protective gas delivery pipeline is disposed inside the lower fixed loading platform 62 , and the lower protective gas delivery pipeline is connected to an external protective gas delivery source and communicated with the first welding cavity 621 of the lower loading platform.

[0072] Through the above structure, the upper loading platform first welding chamber 611, the upper loading platform second welding chamber 612 and the lower loading platform first welding chamber 621 form a protective gas storage chamber, thereby protecting the processing surface, reducing oxidation and improving processing quality.

[0073] Existing laser connection technologies for metal and carbon fiber thermoplastic composites mostly use simple pressure loading methods. Although these devices are simple, the pressure distribution they load is relatively uneven, which leads to uneven distribution of the molten polymer matrix. Although ultrasonic vibration and top ball rolling can assist in regulating the distribution of the molten polymer matrix, the overall effect will also be limited. Moreover, these auxiliary facilities inevitably increase the complexity of laser connection equipment, which is very unfavorable for large-scale and automated production.

[0074] Based on the purpose of controllable and high uniformity of pressure loading, this application proposes a design of upper and lower fixed loading platforms combined with the shape of the joints of the strengthening connection structure, which can achieve uniform distribution of pressure loads through full-width loading. Moreover, the first welding cavity 611 of the upper loading platform, the second welding cavity 612 of the upper loading platform and the first welding cavity 621 of the lower loading platform for laser processing can retain protective gas to protect the laser processing surface; and by adjusting the flow rate of the protective gas, the turbulence effect in the laser processing area can be changed, thereby adjusting the cooling rate of the laser scanning metal surface.

[0075] In some embodiments, the upper fixed loading platform 61 has a loading surface, and the loading surface of the upper fixed loading platform 61 is a special-shaped surface whose shape is adapted to the metal connection reinforcement structure 1, and the lower fixed loading platform 62 has a loading surface, and the loading surface of the lower fixed loading platform 62 is a special-shaped surface whose shape is adapted to the metal plate 2.

[0076] The upper fixed loading platform 61 has an upper positioning recess on its loading surface, and an upper loading platform locking boss 613 is formed on the upper fixed loading platform 61 at the upper positioning recess. The upper positioning recess and the upper loading platform locking boss 613 are used to position the metal connection reinforcement structure 1. The lower fixed loading platform 62 has a lower positioning recess on its loading surface, and a lower loading platform locking boss 623 is formed on the lower fixed loading platform 62 at the lower positioning recess. The lower positioning recess and the lower loading platform locking boss 623 are used to position the metal plate 2.

[0077] The positioning and locking structures of the upper positioning recess, the upper loading platform locking boss 613, the lower positioning recess and the lower loading platform locking boss 623 of the upper fixed loading platform 61 and the lower fixed loading platform 62 can effectively define the positions of the metal connection reinforcement structure 1, the metal plate 2 and the carbon fiber thermoplastic composite material plate 3, thereby improving the processing efficiency and processing accuracy. Specifically, the locking boss 613 of the upper loading platform and the locking boss 623 of the lower loading platform are in the same vertical plane.

[0078] In some other embodiments, a negative pressure adsorption system may be further provided inside the upper fixed loading platform 61 and the lower fixed loading platform 62. The negative pressure adsorption system may be used to more conveniently and stably adsorb the metal connection reinforcement structure 1 and the metal plate 2, thereby improving reliability and efficiency.

[0079] Based on the above-mentioned connection structure of metal and carbon fiber thermoplastic composite material and fixed loading platform of metal and carbon fiber thermoplastic composite material, the present invention further provides:

[0080] A welding device for metal and carbon fiber thermoplastic composite materials, including the fixed loading platform of the metal and carbon fiber thermoplastic composite materials, and also including a laser welding device and a load applying mechanism used in conjunction therewith. The fixed loading platform of the metal and carbon fiber thermoplastic composite materials is used to realize the fixed loading work of the connection structure of the metal and carbon fiber thermoplastic composite materials. The laser welding device is used to realize the mutual welding connection of the metal connection reinforcement structure 1, the metal plate 2 and the carbon fiber thermoplastic composite material plate 3. The load applying mechanism is used to apply a preset load between the upper fixed loading platform 61 and the lower fixed loading platform 62.

[0081] It also includes a matching manipulator, which is used to realize the automatic operation of the upper fixed loading platform 61, the lower fixed loading platform 62 and the laser welding equipment. The manipulator includes a loading platform manipulator, and the loading platform manipulator includes an upper loading platform manipulator and a lower loading platform manipulator, and the upper loading platform manipulator and the lower loading platform manipulator are respectively fixedly connected to the upper fixed loading platform 61 and the lower fixed loading platform 62 and are respectively used to drive the upper fixed loading platform 61 and the lower fixed loading platform 62 to move. The manipulator includes a laser welding equipment manipulator, and the laser welding equipment manipulator includes a first laser welding equipment manipulator, a second laser welding equipment manipulator and a third laser welding equipment manipulator. The laser welding equipment includes a first laser welding equipment, a second laser welding equipment and a third laser welding equipment. The first laser welding equipment is installed on the first laser welding equipment manipulator, the second laser welding equipment is installed on the second laser welding equipment manipulator, and the third laser welding equipment is installed on the third laser welding equipment manipulator. The first laser welding equipment manipulator is used to drive the first laser welding equipment to perform laser welding in the first welding cavity 611 of the upper loading platform, the second laser welding equipment manipulator is used to drive the second laser welding equipment to perform laser welding in the second welding cavity 612 of the upper loading platform, and the third laser welding equipment manipulator is used to drive the third laser welding equipment to perform laser welding in the first welding cavity 621 of the lower loading platform.

[0082] Preferably, the load pressure applied by the load applying mechanism to the upper fixed loading platform 61 and the lower fixed loading platform 62 is adjustable, and the adjustment range of the load pressure is 1000N-5000N.

[0083] Preferably, when the laser welding equipment performs welding work on the first welding surface 11 of the metal connection reinforcement structure 1 and the first area of ​​the metal plate welding surface 21 of the metal plate 2, the power of the laser welding equipment is 4000-10000W, and the scanning speed is 10-30mm / s. When the laser welding equipment performs welding work on the second welding surface 12 of the metal connection reinforcement structure 1 and the first surface of the carbon fiber thermoplastic composite material plate 3 and the metal plate welding surface 21 of the metal plate 2 and the second surface of the carbon fiber thermoplastic composite material plate 3, the power of the laser welding equipment is 60-150W, the frequency is 1000-2000Hz, the pulse width is 72ns, the wavelength is 1064nm, and the scanning speed is 2-20mm / s.

[0084] In addition, the fluidity of the matrix of carbon fiber thermoplastic composites after melting is affected by the overall factors such as laser energy, pressure load, pressure uniformity, scanning speed and route. When the laser output energy and laser scanning speed are unreasonable, the molten polymer matrix material with too high or too low fluidity will cause insufficient filling of the microgrooves. Unreasonable and uneven pressure loads will also lead to insufficient filling of microgrooves by the molten molecular matrix material. By regulating the laser output energy, pressure load, laser scanning speed and route, the melting state of the matrix polymer material of the carbon fiber thermoplastic composite can be better controlled to obtain a more ideal interface effect.

[0085] A welding process for metal and carbon fiber thermoplastic composite materials, characterized in that the welding work is completed using the welding equipment for metal and carbon fiber thermoplastic composite materials described in any one of claims 13-19.

[0086] 21. A welding process of metal and carbon fiber thermoplastic composite material according to claim 20, characterized in that it comprises the following steps:

[0087] Step 1: Positioning components, pre-setting the metal plate 2 on the lower fixed loading platform 61, aligning the upper fixed loading platform 61 pre-set with the metal connection reinforcement structure 1 with the lower fixed loading platform 62 through the position of the metal plate 2 defined by the lower fixed loading platform 61, pre-setting a gap between the upper fixed loading platform 61 and the lower fixed loading platform 62, placing the carbon fiber thermoplastic composite material plate 3 in the gap between the upper fixed loading platform 61 and the lower fixed loading platform 62, and limiting the metal connection reinforcement structure 1 through the upper fixed loading platform 61;

[0088] Before the carbon fiber thermoplastic composite material plate 3 is placed in the gap between the upper fixed loading platform 61 and the lower fixed loading platform 62 , a polymer film 5 is disposed on the first surface and the second surface of the carbon fiber thermoplastic composite material plate 3 .

[0089] Step 2: Loading pressure. After positioning is completed, the upper fixed loading platform 61 and the lower fixed loading platform 62 are loaded with pressure through the cylinder load applying mechanism to tightly press the metal connection reinforcement structure 1, the metal plate 2 and the carbon fiber thermoplastic composite material plate 3;

[0090] Step 3: laser welding, respectively setting laser welding process parameters of the metal connection reinforcement structure 1 and the metal plate 2 and the metal connection reinforcement structure 1, the metal plate 2 and the carbon fiber thermoplastic composite material plate 3, and performing welding at a specified speed and output power respectively by a laser welding device controlled by a manipulator;

[0091] Step 4: Unloading: After the laser welding equipment completes the welding work, the upper fixed loading platform 61 is unloaded and moved away, completing the reinforced connection of the metal and carbon fiber thermoplastic composite material.

[0092] In the above process, the pressure load is always kept at a stable value during the laser connection process, and the heat generated by laser scanning promotes the melting of the polymer film and the carbon fiber thermoplastic composite matrix, and causes the molten polymer material to flow and fill the micro-groove texture, thereby forming an interfacial mosaic structure of the metal and carbon fiber thermoplastic composite material and eliminating the bubble defects on the interface. After the laser connection is completed, the pressure is maintained until the metal temperature is below 50°C to stabilize the connection interface between the metal and the carbon fiber thermoplastic composite material.

[0093] Preferably, the load pressure applied by the load applying mechanism to the upper fixed loading platform 61 and the lower fixed loading platform 62 is adjustable, and the adjustment range of the load pressure is 1000N-5000N.

[0094] Preferably, when the laser welding equipment performs welding work on the first welding surface 11 of the metal connection reinforcement structure 1 and the first area of ​​the metal plate welding surface 21 of the metal plate 2, the power of the laser welding equipment is 4000-10000W, and the scanning speed is 10-30mm / s. When the laser welding equipment performs welding work on the second welding surface 12 of the metal connection reinforcement structure 1 and the first surface of the carbon fiber thermoplastic composite material plate 3 and the metal plate welding surface 21 of the metal plate 2 and the second surface of the carbon fiber thermoplastic composite material plate 3, the power of the laser welding equipment is 60-150W, the frequency is 1000-2000Hz, the pulse width is 72ns, the wavelength is 1064nm, and the scanning speed is 2-20mm / s.

[0095] In addition, the fluidity of the matrix of carbon fiber thermoplastic composites after melting is affected by the overall factors such as laser energy, pressure load, pressure uniformity, scanning speed and route. When the laser output energy and laser scanning speed are unreasonable, the molten polymer matrix material with too high or too low fluidity will cause insufficient filling of the microgrooves. Unreasonable and uneven pressure loads will also lead to insufficient filling of microgrooves by the molten molecular matrix material. By regulating the laser output energy, pressure load, laser scanning speed and route, the melting state of the matrix polymer material of the carbon fiber thermoplastic composite can be better controlled to obtain a more ideal interface effect.

[0096] Embodiment 1:

[0097] like Figure 1 As shown, the surface where the metal connection reinforcement structure 1 and the metal plate 2 are connected to the carbon fiber thermoplastic composite material plate is pre-set with a micro-groove texture array, and the micro-groove is a nearly rectangular structure with a spacing of 70 μm, a width of 10 μm, and a depth of 20 μm.

[0098] The metal connection reinforcement structure 1 and the metal plate 2 are made of AZ31B magnesium alloy with a thickness of 3 mm, and the carbon fiber thermoplastic composite material plate 3 is made of long continuous carbon fiber reinforced polyaryletherketone with a thickness of 3 mm.

[0099] The metal plate 2 is first placed on the lower fixed loading platform 62, and its position is defined by the lower loading platform positioning boss 623. The metal connection reinforcement structure 1 is pre-placed at the positioning recess of the upper fixed loading platform 61, and its position is defined by the upper loading platform positioning boss 613, and can be fixed by an adsorption gripper. The upper fixed loading platform 61 carrying the metal connection reinforcement structure 1 and the lower fixed loading platform 62 carrying the metal plate 2 are pre-positioned, and the carbon fiber thermoplastic composite material plate 3 with the polymer film 5 is placed between the metal connection reinforcement structure 1 and the metal plate 2, and the position is defined by the positioning step 13 of the metal connection reinforcement structure 1.

[0100] The upper and lower fixed loading platforms apply pressure loads through the manipulator, and the fiber laser, with the assistance of the manipulator, processes the upper loading platform metal first welding cavity 611, the upper loading platform second welding cavity 612 and the lower loading platform first welding cavity 621 according to the preset welding process.

[0101] Embodiment 2:

[0102] Step 1: Clean the metal surface with alcohol, and then use a pulsed fiber laser to prepare a preset microgroove texture 4 on the surface where the metal connection reinforcement structure 1 and the metal plate 2 are connected to the carbon fiber thermoplastic composite material plate 3. The metal connection reinforcement structure 1 is preset to the limit structure of the upper fixed loading platform 61, and the metal plate 2 is placed at the predetermined position of the lower fixed loading platform 62. The upper fixed loading platform 61 moves to the predetermined position and aligns with the position of the lower fixed loading platform 62, leaving a gap of 1-2mm; then the carbon fiber thermoplastic composite material plate 3 with the polymer film 5 is pushed into the gap between the upper and lower fixed loading platforms, and positioned using the positioning step 13 of the metal connection reinforcement structure 1.

[0103] Step 2: After the position of the component is fixed, the upper and lower fixed loading platforms are fixed with pressure of 1200 N. Protective gas is introduced into the first welding cavity 611 of the upper loading platform, the second welding cavity 612 of the upper loading platform and the first welding cavity 621 of the lower loading platform, and the gas flow speed is set as required (.

[0104] Step three, set the laser process parameters: the laser output power for metal-to-metal welding is 6000W, and the scanning speed is 15mm / s; the laser output power for metal-to-carbon fiber thermoplastic composite welding is 100W, the frequency is 1000Hz, the pulse width is 72ns, the wavelength is 1064nm, and the scanning speed is 3mm / s.

[0105] The metal material used in this embodiment is AZ31B magnesium alloy with a thickness of 3mm, and the carbon fiber thermoplastic composite material is long continuous carbon fiber reinforced polyaryletherketone with a thickness of 3mm. The metal surface microgroove texture is processed by nanosecond laser. The metal surface microgroove texture is a nearly rectangular structure with a spacing of 70μm, a width of 10μm, and a depth of 20μm ( Figure 4 and Figure 5 shown).

[0106] This embodiment utilizes the orderly scanning of the laser, combined with the uniform pressure-maintaining effect and the interconnected microgroove texture to achieve the escape of thermal expansion air, eliminate the generation of bubbles, and promote the molten polymer material matrix to fill the microgroove structure, thereby forming a dense metal and carbon fiber thermoplastic composite material connection interface and a deep interlocking structure. The double-sided reinforced connection structure of the metal and carbon fiber thermoplastic composite material after laser connection will have higher performance ( Figure 3 shown).

[0107] The difference from the present embodiment in terms of performance improvement is that the double-sided reinforced connection between the carbon fiber thermoplastic composite material and the metal is achieved by strengthening the connection structure, and the stress distribution characteristics when the connection head is subjected to force are changed, which is conducive to utilizing the interlocking structure formed by the micro-groove texture and the carbon fiber thermoplastic composite material, and significantly improving the strength of the metal and carbon fiber thermoplastic composite material. The upper and lower fixed loading platforms can better realize the distribution of the interface pressure between the metal and the carbon fiber thermoplastic composite material, and the connected micro-groove texture is conducive to the overflow of thermal expansion air. These features can increase the process parameter range of laser connection, simplify the process control requirements, and improve the quality of laser connection. In addition, the upper and lower fixed loading platforms can be combined with a robotic arm to realize efficient and automated processing of metal and carbon fiber thermoplastic composite materials, which is conducive to large-scale production.

[0108] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A connection structure of metal and carbon fiber thermoplastic composite material, characterized in that: The invention comprises a metal connection reinforcement structure (1), a metal plate (2) and a carbon fiber thermoplastic composite material plate (3), wherein the metal connection reinforcement structure (1) is a Z-shaped structure, the Z-shaped structure forms a positioning step (13), a first welding surface (11) and a second welding surface (12) on the metal connection reinforcement structure (1), the metal plate (2) has a metal plate welding surface (21), the metal plate welding surface (21) has a first area and a second area, and the carbon fiber thermoplastic composite material plate (3) is positioned at the positioning step of the metal connection reinforcement structure (1). The step (13) is located between the metal connection reinforcement structure (1) and the metal plate (2), the first welding surface (11) of the metal connection reinforcement structure (1) is welded to a first area on a metal plate welding surface (21) of the metal plate (2), the second welding surface (12) of the metal connection reinforcement structure (1) is welded to a first surface of the carbon fiber thermoplastic composite material plate (3), and the second area on the metal plate welding surface (21) of the metal plate (2) is welded to a second surface of the carbon fiber thermoplastic composite material plate (3).

2. The connection structure of metal and carbon fiber thermoplastic composite material according to claim 1, characterized in that: The second welding surface (12) of the metal connection strengthening structure (1) and the second area on the metal plate welding surface (21) of the metal plate (2) are both provided with a micro-groove texture (4); The micro-groove texture (4) on the second welding surface (12) and the second region on the metal plate welding surface (21) has a spacing of 30-80 μm, a width of 10-50 μm, and a depth of 15-150 μm; The metal connection reinforcement structure (1) and the metal plate (2) are made of aluminum alloy or magnesium alloy, and have a thickness of 2-8 mm; The carbon fiber thermoplastic composite material plate (3) is one of polyamide, polyaryletherketone and polyimide reinforced with continuous carbon fibers, and the thickness of the carbon fiber thermoplastic composite material plate (3) is in the range of 2-8 mm; The step height of the positioning step (13) on the metal connection reinforcement structure (1) is the same as the thickness of the carbon fiber thermoplastic composite material plate (3).

3. A connection structure of a metal and carbon fiber thermoplastic composite material according to any one of claims 1 to 2, characterized in that: A polymer film (5) is provided between the second welding surface (12) of the metal connection reinforcement structure (1) and the first surface of the carbon fiber thermoplastic composite material plate (3), and between the second area of ​​the metal plate welding surface (21) and the second surface of the carbon fiber thermoplastic composite material plate (3).

4. A fixed loading platform of metal and carbon fiber thermoplastic composite material, characterized in that: The fixed loading platform is used to realize the fixed loading of the connection structure of the metal and carbon fiber thermoplastic composite material according to any one of claims 1 to 3, and comprises an upper fixed loading platform (61) and a lower fixed loading platform (62), wherein the upper fixed loading platform (61) is used to fix the metal connection reinforcement structure (1), and the lower fixed loading platform (62) is used to fix the metal plate (2), and the upper fixed loading platform (61) is provided with an upper loading platform first welding cavity (611) and an upper loading platform second welding cavity (612), and the lower fixed loading platform (62) is provided with a lower loading platform first welding cavity (611). 21), the first welding cavity (611) of the upper loading platform is used to perform welding work on the first welding surface (11) of the metal connection reinforcement structure (1) and the first area on the welding surface (21) of the metal plate, the second welding cavity (612) of the upper loading platform is used to perform welding work on the second welding surface (12) of the metal connection reinforcement structure (1) and the first surface of the carbon fiber thermoplastic composite material plate (3), and the first welding cavity (621) of the lower loading platform is used to perform welding work on the second area of ​​the metal welding surface (21) and the second surface of the carbon fiber thermoplastic composite material plate (3).

5. A fixed loading platform of metal and carbon fiber thermoplastic composite material according to claim 4, characterized in that: An upper protective gas delivery pipeline is provided inside the upper fixed loading platform (61), and the upper protective gas delivery pipeline is connected to an external protective gas delivery source and communicates with the first welding chamber (611) of the upper loading platform and the second welding chamber (612) of the upper loading platform; A lower protective gas delivery pipeline is provided inside the lower fixed loading platform (62), and the lower protective gas delivery pipeline is connected to an external protective gas delivery source and communicates with the first welding chamber (621) of the lower loading platform.

6. A fixed loading platform of metal and carbon fiber thermoplastic composite material according to claim 4, characterized in that: The upper fixed loading platform (61) has a loading surface, and the loading surface of the upper fixed loading platform (61) is a special-shaped surface whose shape is adapted to the metal connection strengthening structure (1); the lower fixed loading platform (62) has a loading surface, and the loading surface of the lower fixed loading platform (62) is a special-shaped surface whose shape is adapted to the metal plate (2); The upper fixed loading platform (61) has an upper positioning recess on its loading surface, and the upper positioning recess forms an upper loading platform positioning boss (613) on the upper fixed loading platform (61). The upper positioning recess and the upper loading platform positioning boss (613) are used to position the metal connection reinforcement structure (1). The lower fixed loading platform (62) has a lower positioning recess on its loading surface, and the lower positioning recess forms a lower loading platform positioning boss (623) on the lower fixed loading platform (62). The lower positioning recess and the lower loading platform positioning boss (623) are used to position the metal plate (2).

7. A welding device for metal and carbon fiber thermoplastic composite materials, characterized in that: The invention comprises a fixed loading platform of the metal and carbon fiber thermoplastic composite material as described in any one of claims 4 to 6, and also comprises a laser welding device and a load applying mechanism used in conjunction therewith, wherein the fixed loading platform of the metal and carbon fiber thermoplastic composite material is used to realize the fixed loading work of the connection structure of the metal and carbon fiber thermoplastic composite material as described in any one of claims 1 to 3, the laser welding device is used to realize the mutual welding connection of the metal connection reinforcement structure (1), the metal plate (2) and the carbon fiber thermoplastic composite plate (3), and the load applying mechanism is used to apply a preset load between the upper fixed loading platform (61) and the lower fixed loading platform (62).

8. The welding equipment of metal and carbon fiber thermoplastic composite material according to claim 7, characterized in that: Also included is a matching manipulator, which is used to realize automatic operation of the upper fixed loading platform (61), the lower fixed loading platform (62) and the laser welding equipment; The manipulator comprises a loading platform manipulator, and the loading platform manipulator comprises an upper loading platform manipulator and a lower loading platform manipulator, and the upper loading platform manipulator and the lower loading platform manipulator are respectively fixedly connected to the upper fixed loading platform (61) and the lower fixed loading platform (62) and are respectively used to drive the upper fixed loading platform (61) and the lower fixed loading platform (62) to move; The manipulator comprises a laser welding equipment manipulator, the laser welding equipment manipulator comprises a first laser welding equipment manipulator, a second laser welding equipment manipulator and a third laser welding equipment manipulator, the laser welding equipment comprises a first laser welding equipment, a second laser welding equipment and a third laser welding equipment, the first laser welding equipment is mounted on the first laser welding equipment manipulator, the second laser welding equipment is mounted on the second laser welding equipment manipulator, the third laser welding equipment is mounted on the third laser welding equipment manipulator, the first laser welding equipment manipulator is used to drive the first laser welding equipment to perform laser welding in the first welding cavity (611) of the upper loading platform, the second laser welding equipment manipulator is used to drive the second laser welding equipment to perform laser welding in the second welding cavity (612) of the upper loading platform, and the third laser welding equipment manipulator is used to drive the third laser welding equipment to perform laser welding in the first welding cavity (621) of the lower loading platform; The load pressure applied by the load applying mechanism to the upper fixed loading platform (61) and the lower fixed loading platform (62) is adjustable, and the load pressure adjustment range is 1000N-5000N.

9. A welding process for metal and carbon fiber thermoplastic composite material, characterized in that: The welding work is completed by using the welding equipment of the metal and carbon fiber thermoplastic composite material according to any one of claims 7-8, comprising the following steps: Step 1: Positioning the components, pre-setting the metal plate (2) on the lower fixed loading platform (61), aligning the upper fixed loading platform (61) pre-set with the metal connection reinforcement structure (1) with the lower fixed loading platform (62) by limiting the position of the metal plate (2) by the lower fixed loading platform (61), pre-setting a gap between the upper fixed loading platform (61) and the lower fixed loading platform (62), placing the carbon fiber thermoplastic composite material plate (3) in the gap between the upper fixed loading platform (61) and the lower fixed loading platform (62), and limiting the metal connection reinforcement structure (1) by the upper fixed loading platform (61); Step 2: Loading pressure. After positioning is completed, a cylinder load applying mechanism is used to load pressure on the upper fixed loading platform (61) and the lower fixed loading platform (62), so that the metal connection reinforcement structure (1), the metal plate (2) and the carbon fiber thermoplastic composite material plate (3) are tightly pressed together; Step 3: laser welding, respectively setting laser welding process parameters of the metal connection reinforcement structure (1) and the metal plate (2) and the metal connection reinforcement structure (1), the metal plate (2) and the carbon fiber thermoplastic composite material plate (3), and performing welding at a specified speed and output power through a laser welding device controlled by a robot; Step 4: Unloading: After the laser welding equipment completes the welding work, the upper fixed loading platform (61) is unloaded and moved away, completing the reinforced connection of the metal and carbon fiber thermoplastic composite material.

10. A welding process for metal and carbon fiber thermoplastic composite material according to claim 9, characterized in that: The load pressure applied by the load applying mechanism to the upper fixed loading platform (61) and the lower fixed loading platform (62) is adjustable, and the load pressure adjustment range is 1000N-5000N; When the laser welding equipment performs welding work on the first welding surface (11) of the metal connection reinforcement structure (1) and the first area of ​​the metal plate welding surface (21) of the metal plate (2), the power of the laser welding equipment is 4000-10000W and the scanning speed is 10-30mm / s; When the laser welding equipment is performing welding operations between the second welding surface (12) of the metal connection reinforcement structure (1) and the first surface of the carbon fiber thermoplastic composite material plate (3) and between the metal plate welding surface (21) of the metal plate (2) and the second surface of the carbon fiber thermoplastic composite material plate (3), the power of the laser welding equipment is 60-150 W, the frequency is 1000-2000 Hz, the pulse width is 72 ns, the wavelength is 1064 nm, and the scanning speed is 2-20 mm / s; Before the carbon fiber thermoplastic composite material plate (3) is placed in the gap between the upper fixed loading platform (61) and the lower fixed loading platform (62), a polymer film (5) is provided on the first surface and the second surface of the carbon fiber thermoplastic composite material plate (3).

Images