Device and method for microwave welding metal honeycomb core sandwich panels

Abstract

The present invention relates to the technical field of metal honeycomb panel processing, specifically to a device and method for microwave welding metal honeycomb core sandwich panels, comprising a punching machine, a mixer is provided on one side of the punching machine, a tunnel-type microwave heating machine is provided on one side of the mixer, a fixed slot is provided at one end of the tunnel-type microwave heating machine, a rolling mill is provided on one side of the fixed slot, and a gripping device is provided on the upper part of the fixed slot. In the device and method for microwave welding metal honeycomb core sandwich panels, by introducing microwave welding technology, utilizing the rapid heating characteristics of the microwave generating field, combining strong microwave absorbers and metal nanoparticles, accurate and rapid melting of solder is achieved, the welding cycle is shortened, and the uniformity of heating and precise temperature control are ensured, effectively avoiding the problems of overheating and uneven temperature in traditional welding methods. The device integrates multiple processes such as stamping, mixing and coating, microwave heating, assembly, rolling and cooling.

Description

Technical Field

[0001] The invention relates to the technical field of metal honeycomb panel processing, in particular to a device and method for microwave welding a metal honeycomb core sandwich panel. Background Art

[0002] In the field of materials science, honeycomb structures have attracted considerable attention due to their unique geometric properties. This structure, composed of regular hexagonal units, not only possesses excellent mechanical properties, such as high strength, light weight, and good sound and thermal insulation, but also boasts a wide range of applications in aerospace, automotive, construction, and electronic equipment due to its material-saving properties. However, traditional honeycomb structures are primarily manufactured using a bonding process. While this process is simple, the resulting honeycomb core panels have significant limitations in terms of water resistance, fire resistance, and temperature resistance. Subsequent installation methods are also limited to gluing and cold connections, making them difficult to meet the demands of high-end applications.

[0003] To overcome these shortcomings of bonding, researchers have begun exploring welding as an alternative. While welding techniques, particularly traditional methods such as welding adjacent trapezoidal bars to form a regular hexagonal honeycomb structure, can significantly improve compressive strength, their complex manufacturing process and high cost limit their widespread application. In recent years, advancements in material processing technology have led to the rise of a method for forming honeycomb core panels by pressing flat panels into molds, simplifying the manufacturing process and reducing costs.

[0004] However, traditional welding methods such as brazing are still often used to connect the honeycomb core panel to the metal base plate. These methods have strict requirements on process and temperature control, require special equipment, and are relatively inefficient. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for microwave welding metal honeycomb core sandwich panels, so as to solve the problem proposed in the above background technology that traditional welding methods such as brazing are still mostly used to connect the honeycomb core panel and the metal base panel. These methods have strict requirements on process and temperature control, require special equipment, and are relatively inefficient.

[0006] To achieve the above-mentioned objectives, the present invention provides a device for microwave welding metal honeycomb core sandwich panels, comprising a punching machine, a mixer is provided on one side of the punching machine, a tunnel-type microwave heating machine is provided on one side of the mixer, a fixed slot is provided at one end of the tunnel-type microwave heating machine, a rolling mill is provided on one side of the fixed slot, and a grabbing and releasing device is provided on the upper part of the fixed slot.

[0007] As a preferred embodiment of the present invention, the punching machine is loaded with materials through a loading conveyor belt. The punching machine includes a punching plate, which is driven to rise and fall by a hydraulic cylinder. A bottom mold is provided under the punching plate, and a flat plate is placed on the bottom mold. The inner core plate with a honeycomb structure is formed by punching through the punching plate.

[0008] As a preferred embodiment of the present invention, the mixer includes a main unit, the outside of which is connected to a feed pipe, a paint conveyor belt is provided at the lower front part of the mixer, the outer end of the feed pipe is connected to a front coating roller and a back coating roller, the front coating roller and the back coating roller are cylindrical structures, and a plurality of slurry outlets are provided on the surface.

[0009] As a preferred embodiment of the present invention, the front coating roller is located at the upper part of one end of the conveyor belt, and the back coating roller is located at the lower part of the other end of the conveyor belt. The height of the back coating roller is lower than that of the front coating roller. When the stamped inner core board passes through the paint conveyor belt, the back side contacts the back coating roller and the front side contacts the front coating roller, and the solder is evenly coated on the front and back sides of the inner core board.

[0010] As a preferred embodiment of the present invention, the tunnel-type microwave heating machine is a channel with openings at both ends, with a heating conveyor belt and a microwave generating field provided inside. When the inner core plate passes through the heating conveyor belt, the inner core plate is heated by the microwave generating field, causing the solder to melt.

[0011] As a preferred embodiment of the present invention, the grasping and placing device includes a horizontally arranged linear slide, on which a mechanical claw is installed. The mechanical claw is driven by the linear slide to move horizontally. A lifting machine is arranged inside the fixed slot. The lifting machine combines the metal bottom plate with the lower part of the inner core plate. The grasping and placing device grasps the metal upper bottom plate, places it on the upper part of the inner core plate, and assembles it to form a metal honeycomb panel.

[0012] As a preferred embodiment of the present invention, the rolling mill includes a rolling mill stand, a plurality of pressure rollers are installed in the middle of the rolling mill stand, a rolling mill conveyor belt is provided on one side of the pressure rollers, the assembled metal honeycomb panels are grabbed by the grabbing and releasing device to the rolling mill conveyor belt, enter the rolling mill through the rolling mill conveyor belt, and are rolled by the pressure rollers so that the upper and lower metal bottom plates are tightly combined with the inner core plate, and the rolled metal honeycomb panels are sprayed with water by the spraying device to achieve rapid cooling.

[0013] The present invention also provides a method for microwave welding a metal honeycomb core sandwich panel, and an apparatus for microwave welding a metal honeycomb core sandwich panel, comprising the following steps:

[0014] S1. Prepare materials:

[0015] Core plate material: Choose aluminum, copper, iron or titanium metal and cut it into flat plates of the required size;

[0016] Solder: Choose tin-lead alloy solder or Locklok solder material;

[0017] Microwave absorber: Choose a strong microwave absorber or metal nanoparticles with a particle size of 2 to 10 nm;

[0018] Metal base plate: prepare upper and lower metal base plates, the material of which is the same as that of the inner core plate;

[0019] S2. Punching the inner core plate: placing the flat plate on the die of the punching machine, and driving the punching plate by the hydraulic cylinder to punch, thereby forming an inner core plate with a honeycomb structure;

[0020] S3. Mixing and coating: Mix the solder and microwave absorbent evenly to form a slurry. Use the front and back coating rollers of the mixer to evenly coat the mixed slurry on both sides of the honeycomb core. The front coating roller is located above one end of the conveyor belt, and the back coating roller is located above the other end to ensure that both sides are evenly coated.

[0021] S4. Microwave heating welding: The honeycomb core plate coated with slurry is fed into a tunnel-type microwave heating machine, which heats the slurry through a microwave generating field for 10 to 15 seconds at a microwave frequency of 915 MHz or 2450 MHz. Under the action of the microwave absorber, the solder melts rapidly.

[0022] S5. Assembling the metal honeycomb panel: The heated honeycomb core panel is transported to the fixed slot via a conveyor belt. A lifting machine below the fixed slot combines the lower metal base plate with the lower part of the honeycomb core panel. A pick-and-place device grabs the upper metal base plate and places it on the upper part of the core panel, completing the welding and assembly of the metal honeycomb panel.

[0023] S6. Rolling and cooling: The assembled metal honeycomb panels are transferred to the rolling mill conveyor belt through the grabbing and releasing device and enter the rolling mill. The rolling mill rolls the metal honeycomb panels through a number of pressure rollers to make the upper and lower metal bottom plates tightly bonded to the honeycomb core plate. The rolled metal honeycomb panels are quickly cooled by the spraying device to ensure the welding effect.

[0024] 9. The method for microwave welding a metal honeycomb core sandwich panel according to claim 8, characterized in that after step S6, a finished product inspection is performed: the rolled metal honeycomb panel is inspected to ensure that its interface bonding rate meets the requirements, i.e., reaches above 96%. The finished product is then subjected to necessary subsequent processing, such as cutting and polishing, to meet specific usage requirements.

[0025] 10. The method for microwave welding a metal honeycomb core sandwich panel according to claim 8, wherein the strong microwave absorber is SiC, and the metal nanoparticles include zinc, iron, aluminum, copper, cobalt, titanium, chromium or nickel.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. This microwave-welded metal honeycomb core sandwich panel device and method utilizes microwave welding technology, leveraging the rapid heating characteristics of the microwave field. Combined with a strong microwave absorber and metal nanoparticles, this method achieves precise and rapid melting of the solder. This not only shortens the welding cycle but also ensures uniform heating and precise temperature control, effectively avoiding the overheating and temperature unevenness common in traditional welding methods. Furthermore, the device integrates multiple processes, including stamping, mixing and coating, microwave heating, assembly, rolling, and cooling, enabling automated and continuous production, significantly improving production efficiency.

[0028] 2. Regarding product quality, the microwave-welded honeycomb core sandwich panels utilize a device and method that achieves higher interfacial bonding and stronger adhesive strength, ensuring product stability and durability. Furthermore, the application of a rolling process further strengthens the bond between the upper and lower metal base plates and the honeycomb core, enhancing the overall mechanical properties of the product. Rapid cooling technology effectively prevents thermal deformation and residual stress in the weld area, ensuring dimensional accuracy and flatness. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the mixer in the present invention;

[0031] Figure 3 It is a structural schematic diagram of the rolling mill in the present invention;

[0032] Figure 4 It is a structural schematic diagram of the fixed card slot in the present invention.

[0033] The meaning of each number in the figure is:

[0034] 1. Punching machine; 11. Loading conveyor belt; 2. Mixer; 21. Main machine; 22. Feed pipe; 23. Front coating roller; 24. Back coating roller; 25. Paint conveyor belt; 3. Tunnel microwave heating machine; 4. Grab and place device; 5. Rolling mill; 51. Rolling mill stand; 52. Press roller; 53. Rolling mill conveyor belt; 6. Honeycomb panel; 7. Fixed card slot. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The present invention provides a device and method for microwave welding a metal honeycomb core sandwich panel, such as Figure 1-Figure 4 As shown, the device comprises a punching machine 1, with a mixer 2 provided on one side of the punching machine 1, a tunnel-type microwave heating machine 3 provided on one side of the mixer 2, a fixed slot 7 provided at one end of the tunnel-type microwave heating machine 3, a rolling mill 5 provided on one side of the fixed slot 7, and a pick-and-place device 4 provided above the fixed slot 7. The device integrates multiple key processes such as punching, mixing and coating, microwave heating, assembly, rolling, and cooling, achieving continuous and automated production from raw materials to finished products. This not only reduces manual intervention and labor intensity, but also significantly shortens the production cycle and improves production efficiency.

[0037] A tunnel-type microwave heating machine is used, utilizing the rapid heating characteristics of the microwave field, combined with strong microwave absorbers and metal nanoparticles, to achieve precise and rapid melting of the solder. This selective heating method ensures uniform and easily controllable temperature in the welding area, avoiding the overheating and temperature unevenness problems encountered in traditional welding methods, thereby improving welding quality and product stability. Through the strengthening treatment of the rolling process, the metal upper and lower base plates are tightly bonded to the honeycomb core plate, significantly improving the overall mechanical properties and interface bonding rate of the product. At the same time, the application of rapid cooling technology effectively prevents thermal deformation and residual stress in the welding area, ensures the dimensional accuracy and flatness of the product, and makes the final metal honeycomb core sandwich panel have higher quality and reliability.

[0038] The flexible design of this device allows it to adapt to the production of metal honeycomb panels of varying specifications and materials. By adjusting the stamping die, mixing ratio, and microwave heating parameters, it can easily achieve diversified production to meet the customized requirements of different industries and customers.

[0039] In this embodiment, the punching machine 1 is loaded through a loading conveyor belt 11. The punching machine 1 includes a punching plate, which is driven to rise and fall by a hydraulic cylinder. A bottom mold is provided under the punching plate, and a flat plate is placed on the bottom mold. The punching plate is used to punch to form an inner core plate with a honeycomb structure.

[0040] Specifically, the mixer 2 includes a main unit 21, the outside of which is connected to a feed pipe 22, a paint conveyor belt 25 is provided at the lower front part of the mixer 2, and the outer ends of the feed pipe 22 are connected to a front coating roller 23 and a back coating roller 24, the front coating roller 23 and the back coating roller 24 are cylindrical structures, and a plurality of slurry outlets are provided on the surface.

[0041] Furthermore, the front coating roller 23 is located at the upper part of one end of the conveyor belt, and the back coating roller 24 is located at the upper part of the other end of the conveyor belt. The height of the back coating roller 24 is lower than the height of the front coating roller 23. When the stamped inner core board passes through the paint conveyor belt 25, the back side contacts the back coating roller 24, and the front side contacts the front coating roller 23, so that the solder is evenly coated on the front and back sides of the inner core board.

[0042] Furthermore, the tunnel-type microwave heating machine 3 is a channel with openings at both ends, and a heating conveyor belt and a microwave generating field are provided inside. When the inner core plate passes through the heating conveyor belt, the inner core plate is heated by the microwave generating field, causing the solder to melt.

[0043] Furthermore, the grasping and placing device 4 includes a horizontally arranged linear slide, on which a mechanical claw is installed. The mechanical claw is driven by the linear slide to move horizontally. A jacking machine is arranged inside the fixed slot 7. The jacking machine combines the metal base plate with the lower part of the inner core plate. The grasping and placing device 4 grasps the metal upper base plate, places it on the upper part of the inner core plate, and assembles it to form a metal honeycomb panel 6.

[0044] Furthermore, the rolling mill 5 includes a rolling mill stand 51, a plurality of pressure rollers 52 are installed in the middle of the rolling mill stand 51, and a rolling mill conveyor belt 53 is provided on one side of the pressure roller 52. The assembled metal honeycomb panel 6 is grabbed by the grabbing and releasing device 4 to the rolling mill conveyor belt 53, enters the rolling mill 5 through the rolling mill conveyor belt 53, and is rolled by the pressure roller 52, so that the upper and lower metal bottom plates are tightly combined with the inner core plate. The rolled metal honeycomb panel 6 is sprayed with water by the spraying device to achieve rapid cooling.

[0045] The punching machine automatically loads materials via a feeding conveyor. Combined with the precise coordination between the punching plate and the bottom die, a hydraulic cylinder drives the punching machine to quickly and accurately punch out the honeycomb-structured core panels. This process not only improves production efficiency but also ensures the accuracy and consistency of the core panel's shape. After the mixer evenly mixes the solder and microwave absorber, the mixed slurry is evenly applied to both sides of the core panel using precisely controlled front and back coating rollers. This design ensures uniform and consistent solder application, laying a solid foundation for subsequent microwave heating and soldering.

[0046] The tunnel microwave heating machine uses the rapid heating characteristics of the microwave field to accurately heat the solder on the inner core board and melt it quickly. This process not only shortens the heating time, but also ensures uniform heating and precise temperature control, thereby improving welding quality and efficiency.

[0047] The coordinated operation of the pick-and-place device, fixed clamps, and jacking mechanism enables precise assembly of the upper and lower metal base plates with the inner core plate. Subsequently, a rolling mill uses several rollers to roll the assembled metal honeycomb panels, further strengthening the bond between the upper and lower metal base plates and the inner core plate. This process ensures the overall mechanical properties and stability of the product. After rolling, the metal honeycomb panels are rapidly cooled by a spraying device, effectively preventing thermal deformation and residual stress. The finished product is then inspected to ensure that the interface bonding ratio meets the requirements, and the necessary subsequent processing, such as cutting and polishing, is performed to meet specific application requirements.

[0048] The present invention also provides a method for microwave welding a metal honeycomb core sandwich panel, and an apparatus for microwave welding a metal honeycomb core sandwich panel, comprising the following steps:

[0049] S1. Prepare materials:

[0050] Core plate material: Choose aluminum, copper, iron or titanium metal and cut it into flat plates of the required size;

[0051] Solder: Choose tin-lead alloy solder or Locklok solder material;

[0052] Microwave absorber: Choose a strong microwave absorber or metal nanoparticles with a particle size of 2 to 10 nm;

[0053] Metal base plate: prepare upper and lower metal base plates, the material of which is the same as that of the inner core plate;

[0054] S2. Punching the inner core plate: placing the flat plate on the die of the punching machine, and driving the punching plate by the hydraulic cylinder to punch, thereby forming an inner core plate with a honeycomb structure;

[0055] S3. Mixing and coating: Mix the solder and microwave absorbent evenly to form a slurry. Use the front and back coating rollers of the mixer to evenly coat the mixed slurry on both sides of the honeycomb core. The front coating roller is located above one end of the conveyor belt, and the back coating roller is located above the other end to ensure that both sides are evenly coated.

[0056] S4. Microwave heating welding: The honeycomb core plate coated with slurry is fed into a tunnel-type microwave heating machine, which heats the slurry through a microwave generating field for 10 to 15 seconds at a microwave frequency of 915 MHz or 2450 MHz. Under the action of the microwave absorber, the solder melts rapidly.

[0057] S5. Assembling the metal honeycomb panel: The heated honeycomb core panel is transported to the fixed slot via a conveyor belt. A lifting machine below the fixed slot combines the lower metal base plate with the lower part of the honeycomb core panel. A pick-and-place device grabs the upper metal base plate and places it on the upper part of the core panel, completing the welding and assembly of the metal honeycomb panel.

[0058] S6. Rolling and cooling: The assembled metal honeycomb panels are transferred to the rolling mill conveyor belt through the grabbing and releasing device and enter the rolling mill. The rolling mill rolls the metal honeycomb panels through a number of pressure rollers to make the upper and lower metal bottom plates tightly bonded to the honeycomb core plate. The rolled metal honeycomb panels are quickly cooled by the spraying device to ensure the welding effect.

[0059] Furthermore, after step S6 is completed, the finished product is inspected: the rolled metal honeycomb panel is inspected to ensure that its interface bonding rate meets the requirements, that is, reaches more than 96%, and the finished product is subjected to necessary subsequent processing, such as cutting and polishing, to meet specific usage.

[0060] Furthermore, the strong microwave absorber is SiC, and the metal nanoparticles include zinc, iron, aluminum, copper, cobalt, titanium, chromium or nickel.

[0061] Application Example 1:

[0062] The above method and device are used to prepare the metal honeycomb panel, specifically:

[0063] Cut the aluminum metal sheet into 25CM long, 25CM wide and 2CM thick aluminum sheets;

[0064] Place it on the die of a punching machine and press it into an inner core board with an isosceles trapezoidal concave-convex honeycomb core;

[0065] Solder: Select tin-lead alloy solder, select SiC as microwave absorber, mix the microwave absorber and solder with resin glue to prepare slurry, and the microwave absorber accounts for 5% of the slurry.

[0066] Evenly apply a mixed slurry of solder and microwave absorbent on both sides of the honeycomb core plate having an isosceles trapezoidal concave-convex structure;

[0067] Place it in a microwave field with a microwave frequency of 2450±5MHz and a heating time of 10s;

[0068] Quickly melt the solder and cover the upper and lower base plates on both sides of the metal honeycomb core plate;

[0069] The honeycomb structure metal core plate and the upper and lower bottom plates are tightly fitted together by rolling with a hydraulic press, and then cooled quickly to complete the welding and rolling process. After rolling, the interface bonding rate of the metal honeycomb plate is 98%.

[0070] Application Example 2:

[0071] The above method and device are used to prepare the metal honeycomb panel, specifically:

[0072] Cut the aluminum metal sheet into 25CM long, 25CM wide and 3CM thick aluminum sheets;

[0073] Place it on the die of a punching machine and press it into a metal plate with a rectangular concave-convex honeycomb core;

[0074] Solder: choose tin-lead alloy solder, and microwave absorber choose 4nm aluminum nanoparticles;

[0075] Evenly apply a mixed slurry of solder and microwave absorbent on both sides of a rectangular concave-convex honeycomb metal plate;

[0076] Place it in a microwave field with a microwave frequency of 915±5MHz, a microwave power of 2KW, and a treatment time of 5s;

[0077] Quickly melt the solder and cover the upper and lower base plates on both sides of the metal honeycomb core;

[0078] After the solder melts, the hydraulic press is used to make the honeycomb structure metal core plate and the upper and lower bottom plates fit tightly together, and then quickly cool down. The welding and rolling process is completed. After rolling, the interface bonding rate of the metal honeycomb plate is 98%.

[0079] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for microwave welding a metal honeycomb core sandwich panel, comprising a punching machine (1), characterized in that: A mixer (2) is provided on one side of the punching machine (1), a tunnel-type microwave heating machine (3) is provided on one side of the mixer (2), a fixed slot (7) is provided at one end of the tunnel-type microwave heating machine (3), a rolling mill (5) is provided on one side of the fixed slot (7), and a gripping device (4) is provided on the upper part of the fixed slot (7); The punching machine (1) is loaded with materials via a loading conveyor belt (11), and the punching machine (1) comprises a punching plate, which is driven to rise and fall by a hydraulic cylinder, a bottom die is arranged below the punching plate, a flat plate is placed on the bottom die, and an inner core plate having a honeycomb structure is formed by punching through the punching plate; The mixer (2) comprises a main machine (21), the outside of the main machine (21) is connected to a material delivery pipe (22), a paint conveyor belt (25) is arranged at the lower front part of the mixer (2), the outer end of the material delivery pipe (22) is connected to a front coating roller (23) and a back coating roller (24), the front coating roller (23) and the back coating roller (24) are cylindrical structures, and a plurality of slurry outlets are arranged on the surface; The front coating roller (23) is located at the upper part of one end of the conveyor belt, and the back coating roller (24) is located at the lower part of the other end of the conveyor belt. The height of the back coating roller (24) is lower than the height of the front coating roller (23). When the stamped inner core plate passes through the coating conveyor belt (25), the back side contacts the back coating roller (24) and the front side contacts the front coating roller (23), so that the solder is evenly coated on the front and back sides of the inner core plate. The tunnel-type microwave heating machine (3) is a channel with openings at both ends, and a heating conveyor belt and a microwave generating field are arranged inside. When the inner core plate passes through the heating conveyor belt, the solder on the inner core plate is heated by the microwave generating field, so that the solder is melted; The grasping and placing device (4) comprises a horizontally arranged linear slide, on which a mechanical claw is mounted, and the mechanical claw is driven by the linear slide to perform horizontal movement, and a jacking machine is arranged inside the fixed slot (7), and the jacking machine combines the metal bottom plate with the lower part of the inner core plate, and the grasping and placing device (4) grasps the metal upper bottom plate, places it on the upper part of the inner core plate, and assembles it to form a metal honeycomb panel (6).

2. The device for microwave welding metal honeycomb core sandwich panels according to claim 1, characterized in that: The rolling mill (5) comprises a rolling mill stand (51), a plurality of pressure rollers (52) are installed in the middle of the rolling mill stand (51), a rolling mill conveyor belt (53) is arranged on one side of the pressure roller (52), the assembled metal honeycomb panel (6) is grabbed onto the rolling mill conveyor belt (53) by the grabbing and releasing device (4), enters the rolling mill (5) through the rolling mill conveyor belt (53), and is rolled by the pressure rollers (52), so that the upper and lower metal bottom plates are tightly combined with the inner core plate, and the rolled metal honeycomb panel (6) is sprayed with water by the spraying device to achieve rapid cooling.

3. A method for microwave welding a metal honeycomb core sandwich panel, used in the device for microwave welding a metal honeycomb core sandwich panel according to any one of claims 1 to 2, characterized in that: The steps include: S1. Prepare materials: Core plate material: Choose aluminum, copper, iron or titanium metal and cut it into flat plates of required size; Solder: Choose tin-lead alloy solder; Microwave absorber: SiC or metal nanoparticles with a particle size of 2 to 10 nm; Metal base plate: prepare the upper metal base plate and the lower metal base plate, the material is the same as the inner core plate; S2. Punching the inner core plate: placing the flat plate on the die of the punching machine, and driving the punching plate by the hydraulic cylinder to punch, so as to form an inner core plate with a honeycomb structure; S3, mixing and coating: the solder and the microwave absorbent are mixed evenly to form a slurry; the mixed slurry is evenly coated on the front and back sides of the honeycomb core using the front coating roller and the back coating roller of the mixer, the front coating roller is located at the upper part of one end of the conveyor belt, and the back coating roller is located at the upper part of the other end; S4, microwave heating welding: the honeycomb core plate coated with slurry is sent into a tunnel-type microwave heating machine, which heats the slurry through a microwave generating field for 10 to 15 seconds; under the action of the microwave absorber, the solder melts rapidly; S5, assembling metal honeycomb panels: the heated honeycomb inner core panel is conveyed to the fixed slot by a conveyor belt; the jacking machine under the fixed slot combines the lower metal bottom plate with the lower part of the honeycomb inner core panel; the grabbing and placing device grabs the upper metal bottom plate and places it on the upper part of the inner core panel, completing the welding and assembly of the metal honeycomb panel; S6, rolling and cooling: The assembled metal honeycomb panel is transferred to the conveyor belt of the rolling mill through the grabbing and releasing device, and enters the rolling mill. The rolling mill rolls the metal honeycomb panel through a number of rollers, so that the metal upper and lower bottom plates are tightly combined with the honeycomb inner core plate. The rolled metal honeycomb panel is quickly cooled by the spraying device.

4. The method for microwave welding a metal honeycomb core sandwich panel according to claim 3, characterized in that: After step S6 is completed, the finished product is inspected: the rolled metal honeycomb panel is inspected to ensure that its interface bonding rate reaches more than 96%, and then necessary subsequent processing is performed on the finished product.

5. The method for microwave welding a metal honeycomb core sandwich panel according to claim 3, characterized in that: The metal nanoparticles include zinc, iron, aluminum, copper, cobalt, titanium, chromium or nickel.

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