A method for manufacturing composite panels using laser cutting and hot pressing.

Abstract

This invention discloses a method for manufacturing composite panels using laser cutting and hot pressing, comprising the following steps: S1: preparing the materials for the composite panel; S2: performing laser cutting to obtain a first cut sheet of a second fiber-reinforced plastic sheet and a second cut sheet of a second metal sheet; S3: placing the first cut sheet and the second cut sheet into the holes of adjacent second metal sheets and second fiber-reinforced plastic sheets, respectively; S4: alternately stacking several second metal sheets and second fiber-reinforced plastic sheets processed in step S3, fixing them together with the first metal sheet and the first fiber-reinforced plastic sheet, and then performing hot pressing. The advantages of this invention are: it can penetrate deep into the interior of the panel, creating more contact interfaces for the two materials; and under the action of hot pressing, dissimilar materials diffuse into each other and undergo chemical reactions, thereby forming a stronger and more stable bond, improving the overall performance of the composite material.

Description

Technical Field

[0001] This invention relates to the field of joining dissimilar materials such as metals and fiber-reinforced plastics, and more particularly to a method for manufacturing composite panels using laser cutting and hot pressing. Background Technology

[0002] Driven by the national "dual-carbon" goals and green development strategy, and with the increasing demand for lightweight, high-strength, and corrosion-resistant structures, metals and fiber-reinforced plastics, as two major categories of high-performance materials, have shown enormous application potential in aerospace, automotive manufacturing, and new energy fields due to their unique physical and chemical properties. However, the significant differences in their properties mean that bonding them still faces many challenges. Therefore, in-depth research into effective bonding methods for dissimilar materials like metals and fiber-reinforced plastics is of great significance for promoting the development of multi-material heterostructures.

[0003] Currently, the methods used for joining metals and fiber-reinforced plastics mainly include mechanical joining (bolts, riveting), welding (resistance welding, laser welding, ultrasonic welding, etc.), and bonding. Among these, mechanical joining methods cannot avoid material damage and are not conducive to lightweight structures; welding methods often require heating the material to a molten or semi-molten state, which may lead to thermal degradation of the resin matrix in the composite material or a decrease in the performance of carbon fibers, and the welded joint area is limited. In addition, if the material surface is not adequately pretreated before welding, the joint performance will be difficult to meet the requirements of practical applications, thus increasing manufacturing costs; the adhesives used in bonding are prone to aging over time, and there is a risk of coagulation and damage within the adhesive layer.

[0004] Compared to the methods mentioned above, hot-press bonding technology not only promotes the softening and plastic deformation of materials through heating and pressurization, but also significantly enhances the interatomic attraction at the interface, thereby ensuring close contact and a strong bond between the materials. Furthermore, a major advantage of hot-press bonding technology is its wide bonding area, allowing for the flexible application of different pressure heads to achieve comprehensive bonding of the entire sheet material, improving bonding efficiency and stability. In the existing technical field, patent CN116749607A discloses a method and assembly for bonding metals and non-metals. This method achieves a highly efficient and stable sealed bond by placing a thin film with polar surface characteristics between the metal and non-metal to be bonded, followed by a hot-press bonding strategy that heats the metal side and pressurizes the non-metal side. However, this method is limited in that its bonding effect is mainly confined to the surface layer of the sheet material, with limited impact on the overall mechanical properties. Simultaneously, the selection of the intermediate film layer must consider good affinity with the dissimilar materials on both sides, which poses a challenge and limitation in practical applications, affecting the wide applicability of this technology. Therefore, there is an urgent need to provide a method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot-press bonding. Summary of the Invention

[0005] Purpose of the invention

[0006] To address the current problem of hot-pressing connections between metals and non-metals, this invention provides a method for manufacturing composite panels using laser cutting and hot-pressing. This method enables dissimilar materials to not only provide multi-area connections on the surface of the panel but also penetrate deep into the interior, creating more contact interfaces between the two materials. Simultaneously, under the action of hot pressing, the dissimilar materials diffuse into each other and undergo chemical reactions, thereby forming a stronger and more stable bond, which greatly improves the overall performance of the composite material.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The purpose of this invention is to provide a method for manufacturing composite panels using laser cutting and hot pressing, comprising the following steps:

[0009] S1: Prepare the materials for the composite board, the materials of which include a first metal sheet, an intermediate layer and a first fiber-reinforced plastic sheet, the intermediate layer including a plurality of second metal sheets and second fiber-reinforced plastic sheets;

[0010] S2: The adjacent second metal sheet and the second fiber reinforced plastic sheet are laser cut using a laser beam, and the adjacent second metal sheet and the second fiber reinforced plastic sheet are cut with the same number of holes, and the first cut sheet of the second fiber reinforced plastic sheet and the second cut sheet of the second metal sheet are obtained.

[0011] S3: Place the first cut sheet into the hole of the adjacent second metal sheet, and place the second cut sheet into the hole of the adjacent second fiber-reinforced plastic sheet;

[0012] S4: Several second metal sheets and second fiber-reinforced plastic sheets processed in step S3 are alternately stacked to form an intermediate layer to be pressurized. The second metal sheets and second fiber-reinforced plastic sheets on both sides of the intermediate layer to be pressurized are respectively attached to the first fiber-reinforced plastic sheet and the first metal sheet. Then, the second metal sheet, the second fiber-reinforced plastic sheet, the first metal sheet and the first fiber-reinforced plastic sheet are fixed together by a clamp and then hot-pressed together.

[0013] As a further description of the above solution, in step S1, the first metal sheet, the second metal sheet, the first fiber-reinforced plastic sheet, and the second fiber-reinforced plastic sheet all have the same length, width, and thickness, and the thickness of the first metal sheet is 0.2-0.5 mm; the first metal sheet and the second metal sheet are made of the same material, and the first metal sheet is made of aluminum alloy, magnesium alloy, or titanium alloy; the first fiber-reinforced plastic sheet and the second fiber-reinforced plastic sheet are made of the same material, and the first fiber-reinforced plastic sheet includes fibers and plastic, the fibers are made of carbon fiber or glass fiber, and the plastic is made of thermoplastic plastic.

[0014] As a further description of the above scheme, in step S2, the laser power used for the second metal sheet laser cutting process is 800-1500W; the cutting speed of the second metal sheet laser cutting process is 150-200mm / s; and the auxiliary gas pressure of the metal material laser cutting process is 1MPa.

[0015] The laser power for laser cutting of the second fiber reinforced plastic sheet is 800-1200W, the cutting speed is 15-25mm / s, and the auxiliary gas pressure is 0.5-0.7MPa.

[0016] As a further description of the above scheme, in step S2, the second metal sheet and the second fiber-reinforced plastic sheet are subjected to laser cutting. The laser cutting path is through circular lines arrayed simultaneously in the X and Y directions. The diameter of the resulting circular holes is 3-4 times the thickness of the sheet, and the center distance between adjacent circular holes is 2-2.5 times the diameter of the circular holes. The number of arrays is even. The second metal sheet is cut with odd-numbered rows and odd-numbered columns of circles, while the second fiber-reinforced plastic sheet is cut with even-numbered rows and even-numbered columns of circles.

[0017] As a further description of the above scheme, in step S2, the distance between the edge of the second metal sheet and the hole processed by the laser cutting of the adjacent second metal sheet is more than 4 times the diameter of the hole; the distance between the edge of the second fiber reinforced plastic sheet and the hole processed by the laser cutting of the second fiber reinforced plastic sheet is more than 4 times the diameter of the circle.

[0018] As a further description of the above scheme, in step S4, before hot pressing, the second metal sheet, the second fiber-reinforced plastic sheet, the first metal sheet, and the first fiber-reinforced plastic sheet are laid in the following order: the first fiber-reinforced plastic sheet is placed at the bottom, and then the second metal sheet and the second fiber-reinforced plastic sheet after being processed in step S3 are laid alternately from bottom to top, with the first metal sheet placed at the top; the composite board formed by the first metal sheet, the intermediate layer, and the first fiber-reinforced plastic sheet has an overall thickness of 0.8-8mm.

[0019] As a further description of the above scheme, in step S4, the hot-pressing temperature of the hot-pressing connection is 280-450℃, the hot-pressing pressure of the hot-pressing connection is 4-15 MPa, and the heat preservation time of the hot-pressing connection is 5-45 min.

[0020] As a further description of the above solution, in step S4, before hot pressing, the plates need to be sealed and stored. After cleaning the dust and impurities from the surfaces of the first metal sheet, the second metal sheet, the second fiber-reinforced plastic sheet, and the first fiber-reinforced plastic sheet, they are placed flat between the upper and lower pressure heads, with the upper and lower pressure heads arranged parallel to each other, and then clamped and fixed with a fixture.

[0021] The beneficial effects of this invention include the following:

[0022] 1. Laser cutting inevitably burns some material due to its inherent process characteristics. To minimize variations in material loss, different parameter ranges are set to standardize the dimensions of the two types of cut sheets, ensuring structural uniformity. Furthermore, the diameter of the circular sheet left after cutting is smaller than the aperture, preventing additional stress after the other material is filled and allowing space for material expansion during hot pressing.

[0023] 2. By precisely controlling the core parameters such as power output and scanning rate of laser cutting, and the hot-pressing temperature and pressure in the hot-pressing process, highly accurate filling of the pore areas in the cut sheet material was achieved. This synergistic optimization strategy of laser and hot-pressing technologies not only effectively curbs the generation of pore defects inside the composite board, but also greatly enhances the overall quality and performance of the board.

[0024] 3. In traditional welding methods, dissimilar materials are only joined within a limited area of ​​the contact surface. This method not only provides multi-area connections on the surface of the sheet (horizontal direction) but also extends into the interior of the sheet (vertical direction), creating more contact interfaces for the two materials. Under hot pressing, the dissimilar materials diffuse into each other and undergo chemical reactions, forming a stronger and more stable bond, greatly improving the overall performance of the composite material.

[0025] 4. In terms of spatial structure, the two materials are interwoven like two nets. This design effectively disperses stress throughout the entire board area when bearing loads, thereby significantly improving the load-bearing capacity and fatigue resistance of the composite board.

[0026] 5. Although laser cutting technology has thickness limitations when processing single-layer thin plates, the heating and pressurizing characteristics of hot pressing connection methods can greatly expand the thickness range of composite plates by alternately stacking and compounding multiple layers of plates, making them flexibly adaptable to various complex operating conditions and performance requirements. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the laser cutting processing area of ​​the present invention.

[0028] Figure 2 This is a schematic diagram of the material laying sequence before hot pressing connection of the present invention. The upper diagram is a schematic diagram of the cutting and filling of the second metal sheet and the second fiber reinforced plastic sheet of the middle layer. The lower left diagram is a schematic diagram of the composite board after laying. The lower right diagram is a cross-sectional view of the composite board after laying.

[0029] Figure 3 This is a schematic diagram of the hot-press connection of the present invention.

[0030] Explanation of the attached figures: 1-Second metal sheet; 2-Laser beam; 3-Second fiber reinforced plastic sheet; 4-First cutting sheet; 5-First metal sheet; 6-First fiber reinforced plastic sheet; 7-Upper pressure head; 8-Clamp; 9-Lower pressure head; 10-Second cutting sheet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Rather, this invention covers any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined by the claims. Furthermore, to provide the public with a better understanding of this invention, certain specific details are described in detail below; however, those skilled in the art can fully understand the invention even without these details.

[0032] In this embodiment, the equipment used for laser surface treatment is a fiber laser (M7 500-1000W, JPT laser), which can precisely cut the experimental material by adjusting parameters such as laser power, cutting speed, and laser frequency, combined with a path drawn by control software. The hot press can manufacture metal and fiber-reinforced plastic composite boards by adjusting parameters such as hot pressing temperature, hot pressing pressure, and holding time.

[0033] A method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing includes the following steps:

[0034] S1: Prepare the materials for the composite board, the materials of which include a first metal sheet 5, an intermediate layer and a first fiber-reinforced plastic sheet 6, the intermediate layer including a plurality of second metal sheets 1 and second fiber-reinforced plastic sheets 3;

[0035] S2: The adjacent second metal sheet 1 and the second fiber reinforced plastic sheet 3 are laser-cut using a laser beam 2, and the adjacent second metal sheet 1 and the second fiber reinforced plastic sheet 3 are cut with the same number of holes, and the first cut sheet 10 of the second fiber reinforced plastic sheet 3 and the second cut sheet 4 of the second metal sheet 1 are obtained.

[0036] S3: Place the first cut sheet 10 into the hole of the adjacent second metal sheet 1, and place the second cut sheet 4 into the hole of the adjacent second fiber-reinforced plastic sheet 3;

[0037] S4: Several second metal sheets 1 and second fiber-reinforced plastic sheets 3 processed in step S3 are alternately stacked to form an intermediate layer to be pressurized. The second metal sheets 1 and second fiber-reinforced plastic sheets 3 on both sides of the intermediate layer to be pressurized are respectively attached to the first fiber-reinforced plastic sheet 6 and the first metal sheet 5. Then, the second metal sheet 1, the second fiber-reinforced plastic sheet 3, the first metal sheet 5 and the first fiber-reinforced plastic sheet 6 are fixed together by the clamp 8 and then hot-pressed together.

[0038] To minimize material burn-off variations, this laser cutting design employs different parameter ranges to standardize the dimensions of the two types of cut sheets, ensuring structural uniformity. Furthermore, the diameter of the resulting circular sheet is smaller than the aperture, preventing additional stress when the other material is inserted and allowing space for material expansion during hot pressing. In addition, while traditional welding methods only connect dissimilar materials within a limited area of ​​the contact surface, this method provides multi-area connections not only on the surface of the sheet (horizontal direction) but also extending into the interior (vertical direction), creating more contact interfaces between the two materials. Under hot pressing, the dissimilar materials diffuse and react chemically, forming a stronger and more stable bond, significantly improving the overall performance of the composite material. Simultaneously, in terms of spatial structure, the two materials intertwine like two interwoven nets. This design effectively disperses stress across the entire board area when subjected to load, thereby significantly improving the load-bearing capacity and fatigue resistance of the composite board. Secondly, although laser cutting technology has thickness limitations when processing single-layer thin plates, the heating and pressurizing characteristics of the hot-pressing connection method allow for the alternating stacking and composite of multiple layers of boards, which can greatly expand the thickness range of the composite board and enable it to flexibly adapt to various complex operating conditions and performance requirements.

[0039] In step S1 of the present invention, the length, width, and thickness of the first metal sheet 5, the second metal sheet 1, the first fiber-reinforced plastic sheet 6, and the second fiber-reinforced plastic sheet 3 are all the same, and the thickness of the first metal sheet 5 is 0.2-0.5 mm; the first metal sheet 5 and the second metal sheet 1 are made of the same material, and the first metal sheet 5 is made of aluminum alloy, magnesium alloy, or titanium alloy; the first fiber-reinforced plastic sheet 6 and the second fiber-reinforced plastic sheet 3 are made of the same material, and the first fiber-reinforced plastic sheet 6 includes fibers and plastic, wherein the fibers are made of carbon fiber or glass fiber; and the plastic is made of thermoplastic plastic.

[0040] In step S2 of the present invention, the laser power used for the second metal sheet laser cutting process is 800-1500W; the cutting speed of the second metal sheet laser cutting process is 150-200mm / s; and the auxiliary gas pressure of the metal material laser cutting process is 1MPa.

[0041] The laser power for laser cutting of the second fiber-reinforced plastic sheet is 800-1200W, the cutting speed is 15-25mm / s, and the auxiliary gas pressure is 0.5-0.7MPa. Processing under these parameters improves cutting efficiency, avoids excessive material loss due to overheating, standardizes the dimensions of the two types of cut sheets, and achieves highly precise filling of the pore areas in the cut sheets. This synergistic optimization strategy of laser and hot pressing technology not only effectively curbs the generation of internal pore defects in the composite board but also greatly enhances the overall quality and performance of the board, providing a good foundation for subsequent processing steps.

[0042] In step S2 of the present invention, the second metal sheet and the second fiber-reinforced plastic sheet are subjected to laser cutting. The laser cutting path is through circular lines arrayed simultaneously in the X and Y directions. The diameter of the resulting circular holes is 3-4 times the thickness of the sheet, and the center distance between adjacent circular holes is 2-2.5 times the diameter of the circular holes. The number of arrays is even. The second metal sheet is cut with odd-numbered rows and columns of circles, and the second fiber-reinforced plastic sheet is cut with even-numbered rows and columns of circles, thereby ensuring that the number of the first and second cut sheets is equal.

[0043] In step S2 of the present invention, the distance between the edge of the second metal sheet and the hole processed by the laser cutting of the adjacent second metal sheet is more than 4 times the diameter of the hole; the distance between the edge of the second fiber reinforced plastic sheet and the hole processed by the laser cutting of the second fiber reinforced plastic sheet is more than 4 times the diameter of the circle.

[0044] In step S4 of the present invention, before hot pressing, the second metal sheet 1, the second fiber-reinforced plastic sheet 3, the first metal sheet 5, and the first fiber-reinforced plastic sheet 6 are laid in the following order: the first fiber-reinforced plastic sheet 6 is placed at the bottom, and then the second metal sheet 1 and the second fiber-reinforced plastic sheet 3 after step S3 are laid alternately from bottom to top, and the first metal sheet 5 is placed at the top; the composite board formed by the first metal sheet 5, the intermediate layer, and the first fiber-reinforced plastic sheet 6 has an overall thickness of 0.8-8mm.

[0045] In step S4 of the present invention, the hot pressing temperature of the hot pressing connection is 280-450°C, the hot pressing pressure of the hot pressing connection is 4-15 MPa, and the heat preservation time of the hot pressing connection is 5-45 min, so as to ensure that the material is fully heated during the hot pressing process, thereby promoting the tight bonding between the materials.

[0046] In step S4 of the present invention, before hot pressing, the sample needs to be sealed and stored. After cleaning the dust and impurities from the surfaces of the first metal sheet 5, the second metal sheet 1, the second fiber-reinforced plastic sheet 3, and the first fiber-reinforced plastic sheet 6, the sample is placed flat between the upper pressure head 7 and the lower pressure head 9, with the upper pressure head 7 and the lower pressure head 9 arranged parallel to each other. The sample is then clamped and fixed with a clamp 8 to ensure that the sample surface is uniformly pressed during pressurization.

[0047] Example

[0048] In this example, laser cutting and hot pressing were used to successfully prepare a composite sheet composed of 6061 aluminum alloy and 30% carbon fiber reinforced PEEK. All raw materials used were thin sheets measuring 80mm × 80mm × 0.3mm. Before hot pressing, the two types of sheets were arranged in an orderly manner: an uncut aluminum alloy sheet at the bottom and an uncut carbon fiber reinforced PEEK sheet on top, with laser-cut sheets alternately stacked in between.

[0049] Step 1: Draw the laser cutting path. First, draw a circular line with a diameter of 1mm. Then, using this as a reference, simultaneously array 34 (including the initial shape) in the X and Y directions, with an array length of 2mm, to obtain the cutting path.

[0050] Step 2: Set the laser cutting parameters. The process parameters for laser cutting of metal materials are: laser power 800-1500W, cutting speed 150-200mm / s, and auxiliary gas pressure 1MPa. The process parameters for laser cutting of fiber-reinforced plastics are: laser power 800-1200W, cutting speed 15-25mm / s, and auxiliary gas pressure 0.5-0.7MPa. During cutting, ensure that the distance between the boundary of the laser cutting area and the edge of the thin plate is 5.5mm.

[0051] Step 3: Lay out the pre-pressed panels. Place the untreated 0.3mm 6061 aluminum alloy sheet at the bottom, then lay the cut carbon fiber reinforced PEEK sheet, and fill the gaps with 6061 aluminum alloy circular sheets. Repeat this process four times, and place the untreated 0.3mm carbon fiber reinforced PEEK sheet on top. The theoretical thickness of the composite panel is 3mm.

[0052] Step 4: Securely tighten the clamps around the mold to ensure the laid-out sheet material is firmly fixed. Then, start the heating program, gradually increasing the temperature of the mold from room temperature to 280-450℃ at a uniform rate of 15℃ per minute, and maintaining this temperature after it is reached. During this process, apply a pressure of 4-15 MPa and hold at this temperature for 20 minutes. After the hot-pressing connection is complete, allow the sheet material to cool down slowly by letting it cool naturally, effectively preventing additional stress problems that may occur during rapid cooling.

[0053] The above description is merely an embodiment of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for manufacturing composite panels using laser cutting and hot pressing, characterized in that, Includes the following steps: S1: Prepare the materials for the composite board, the materials of which include a first metal sheet (5), an intermediate layer and a first fiber-reinforced plastic sheet (6), the intermediate layer including a plurality of second metal sheets (1) and second fiber-reinforced plastic sheets (3). S2: The adjacent second metal sheet (1) and the second fiber reinforced plastic sheet (3) are laser-cut using a laser beam (2). The laser cutting path is through circular lines arrayed simultaneously in the X and Y directions, with an even number of arrays. The second metal sheet (1) is cut with an odd number of rows and columns of circles, and the second fiber reinforced plastic sheet (3) is cut with an even number of rows and columns of circles. The adjacent second metal sheet (1) and the second fiber reinforced plastic sheet (3) are cut with the same number of holes, and the first cut sheet (10) of the second fiber reinforced plastic sheet (3) and the second cut sheet (4) of the second metal sheet (1) are obtained. S3: Place the first cut sheet (10) into the hole of the adjacent second metal sheet (1), and place the second cut sheet (4) into the hole of the adjacent second fiber reinforced plastic sheet (3); S4: Several second metal sheets (1) and second fiber reinforced plastic sheets (3) processed in step S3 are stacked alternately to form a middle layer to be pressurized. The second metal sheets (1) and second fiber reinforced plastic sheets (3) on both sides of the middle layer to be pressurized are respectively attached to the first fiber reinforced plastic sheet (6) and the first metal sheet (5). Then, the second metal sheet (1), the second fiber reinforced plastic sheet (3), the first metal sheet (5) and the first fiber reinforced plastic sheet (6) are fixed together by the clamp (8) and then hot-pressed together.

2. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 1, characterized in that, In step S1, the length, width and thickness of the first metal sheet (5), the second metal sheet (1), the first fiber-reinforced plastic sheet (6) and the second fiber-reinforced plastic sheet (3) are all the same, and the thickness of the first metal sheet (5) is 0.2-0.5 mm; the first metal sheet (5) and the second metal sheet (1) are made of the same material, and the first metal sheet (5) is made of aluminum alloy, magnesium alloy or titanium alloy; the first fiber-reinforced plastic sheet (6) and the second fiber-reinforced plastic sheet (3) are made of the same material, and the first fiber-reinforced plastic sheet (6) includes fiber and plastic, the fiber is made of carbon fiber or glass fiber; the plastic is made of thermoplastic plastic.

3. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 1, characterized in that, In step S2, the laser power used for the second metal sheet laser cutting process is 800-1500W; the cutting speed of the second metal sheet laser cutting process is 150-200mm / s; and the auxiliary gas pressure of the metal material laser cutting process is 1MPa. The laser power for laser cutting of the second fiber reinforced plastic sheet is 800-1200W, the cutting speed is 15-25mm / s, and the auxiliary gas pressure is 0.5-0.7MPa.

4. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 3, characterized in that, In step S2, the diameter of the circular hole obtained by the laser cutting process is 3-4 times the thickness of the thin plate, and the center distance between adjacent circular holes is 2-2.5 times the diameter of the circular hole.

5. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 4, characterized in that, In step S2, the distance between the edge of the second metal sheet and the hole processed by the laser cutting of the adjacent second metal sheet is more than 4 times the diameter of the hole; the distance between the edge of the second fiber reinforced plastic sheet and the hole processed by the laser cutting of the second fiber reinforced plastic sheet is more than 4 times the diameter of the circle.

6. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 1, characterized in that, In step S4, before hot pressing, the second metal sheet (1), the second fiber-reinforced plastic sheet (3), the first metal sheet (5), and the first fiber-reinforced plastic sheet (6) are laid in the following order: the first fiber-reinforced plastic sheet (6) is placed at the bottom, and then the second metal sheet (1) and the second fiber-reinforced plastic sheet (3) after step S3 are laid alternately from bottom to top, and the first metal sheet (5) is placed at the top; the composite board formed by the first metal sheet (5), the middle layer and the first fiber-reinforced plastic sheet (6) has an overall thickness of 0.8-8mm.

7. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 6, characterized in that, In step S4, the hot-pressing temperature of the hot-pressing connection is 280-450℃, the hot-pressing pressure of the hot-pressing connection is 4-15 MPa, and the heat preservation time of the hot-pressing connection is 5-45 min.

8. The method for manufacturing metal and fiber-reinforced plastic composite sheets using laser cutting and hot pressing according to claim 7, characterized in that, In step S4, before hot pressing, the plates need to be sealed and stored. After cleaning the dust and impurities from the surfaces of the first metal sheet (5), the second metal sheet (1), the second fiber-reinforced plastic sheet (3), and the first fiber-reinforced plastic sheet (6), they are placed flat between the upper pressure head (7) and the lower pressure head (9), with the upper pressure head (7) and the lower pressure head (9) arranged parallel to each other, and then clamped and fixed with a clamp (8).

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