Composite board, forming structure and vehicle

Abstract

The utility model provides a composite board, a forming structure and a vehicle. The composite board comprises two metal layers, and the two metal layers are arranged in a stacked mode; the damping layer is arranged between the two metal layers so as to connect the two metal layers; the ratio of the thickness of the metal layer to the thickness of the damping layer is larger than or equal to 8.3 and smaller than 25, the forming quality and precision of the composite board are guaranteed, and the rejection rate of forming of the composite board is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of plate materials, and in particular relates to a composite plate, a forming structure and a vehicle. Background Art

[0002] In the manufacturing industry, molded structures such as covers, as important components of molded structures, play a key role in sound insulation and noise reduction.

[0003] Currently, sheet metal used to make panels is often formed by bending. However, this can cause significant springback after bending, leading to discrepancies between the final shape and size of the panel and the intended design. This impacts the panel's quality and precision, and increases the scrap rate. Utility Model Content

[0004] An object of the present invention is to provide a new technical solution for a composite panel, a formed structure and a vehicle.

[0005] According to a first aspect of the present invention, there is provided a composite board comprising:

[0006] Two metal layers, the two metal layers are stacked;

[0007] a damping layer, the damping layer being disposed between the two metal layers to connect the two metal layers;

[0008] A ratio of the thickness of the metal layer to the thickness of the damping layer is greater than or equal to 8.3 and less than 25.

[0009] Optionally, the ratio of the thickness of the metal layer to the thickness of the damping layer is in the range of 13.3-20.

[0010] Optionally, the springback angle of the composite plate is in the range of 3.0-4.7, the damping factor of the composite plate is in the range of 0.2-0.4, and the peel strength between the two metal layers is greater than or equal to 50 N / cm.

[0011] Optionally, the thickness of the metal layer is in the range of 0.5 mm to 1.2 mm.

[0012] Optionally, the metal layer is an aluminum alloy layer, and the yield strength ratio of the aluminum alloy layer is less than 0.5.

[0013] Optionally, the elongation of the composite plate is greater than or equal to 20%.

[0014] Optionally, the damping layer is one or a combination of a nitrile rubber layer, a butyl rubber layer and an epoxy resin layer.

[0015] Optionally, the thickness of the damping layer is in the range of 40 μm to 80 μm.

[0016] According to a second aspect of the present invention, a forming structure is provided, which includes the composite board described in the first aspect.

[0017] According to a third aspect of the present invention, a vehicle is provided, comprising the molding structure described in the second aspect.

[0018] One of the technical effects of the present invention is:

[0019] An embodiment of the present application provides a composite plate, which includes two metal layers, which are stacked; a damping layer, which is arranged between the two metal layers to connect the two metal layers; the ratio of the thickness of the metal layer to the thickness of the damping layer is greater than or equal to 8.3 and less than 25, thereby ensuring the quality and precision of the composite plate molding and reducing the scrap rate of the composite plate molding.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 A schematic diagram of a composite board provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0024] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] Reference Figure 1 , an embodiment of the present application provides a composite plate, the composite plate comprising:

[0030] Two metal layers 1, two metal layers 1 are stacked;

[0031] A damping layer 2 is provided between the two metal layers 1 to connect the two metal layers 1;

[0032] The ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is greater than or equal to 8.3 and less than 25.

[0033] In this embodiment, two metal layers 1 are stacked to serve as layered structures on both sides of the composite plate to protect the composite plate.

[0034] The damping layer 2 is arranged between the two metal layers 1 to form a three-layered "sandwich" structure of the composite plate. The damping layer 2 can bond the two metal layers 1 to ensure the structural integrity of the composite plate. At the same time, the two metal layers 1 sandwich the damping layer 2 in the middle, and the damping layer 2 can provide shock absorption and noise reduction, so that the composite plate can achieve the effect of damping and noise reduction.

[0035] In one embodiment, the composite panel may be used in a molded structure of a vehicle. In order to match the configuration and shape of the molded structure, the composite panel may be bent and deformed to obtain a molded structural member.

[0036] In this embodiment, the thickness d1 of the single-layer metal layer 1 and the thickness d2 of the damping layer 2 meet the following conditions:

[0037] 25>d1 / d2≥8.3

[0038] The thickness of metal layer 1 is greater than that of damping layer 2, and the damping layer 2 is sandwiched between the two metal layers 1, ensuring that metal layer 1 has low rebound during stamping of the composite panel, allowing the dimensions of the composite panel to remain stable. However, if the ratio of the thickness of metal layer 1 to the thickness of damping layer 2 is too large, for example, if the ratio of the thickness of metal layer 1 to the thickness of damping layer 2 is greater than or equal to 25, that is, the thickness of metal layer 1 is too large, which limits the forming of the composite panel, or the thickness of damping layer 2 is too small, which reduces the damping effect of the composite panel and fails to suppress the rebound of the composite panel.

[0039] However, if the ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is too small, for example, the ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is less than 8.3, that is, the thickness of the metal layer 1 is too small, which reduces the structural strength of the composite plate, or the thickness of the damping layer 2 is too large, which affects the stamping performance of the composite plate and easily leads to delamination of the metal layer 1 and the damping layer 2 during stamping.

[0040] The composite plate provided in the embodiment of the present application includes two metal layers 1, which are stacked; a damping layer 2, which is arranged between the two metal layers 1 to connect the two metal layers 1; the ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is greater than or equal to 8.3 and less than 25, thereby ensuring the quality and precision of the composite plate molding and reducing the scrap rate of the composite plate molding.

[0041] In one embodiment, the ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is in the range of 13.3-20. The damping layer 2 is sandwiched between the two metal layers 1, and the thickness range of the metal layer 1 is effectively controlled, so that the metal layer 1 can be in a low rebound state when the composite plate is stamped and formed, so that the damping and noise reduction effect of the composite plate can remain stable.

[0042] In one embodiment, the rebound angle of the composite plate is in the range of 3.0-4.7, the damping factor of the composite plate is in the range of 0.2-0.4, and the peel strength of the composite plate is greater than or equal to 50 N / cm.

[0043] In this embodiment, the composite plate will rebound after bending deformation. Specifically, the bending deformation of the composite plate includes plastic deformation and elastic deformation. When the load applied to the composite plate is removed, the plastic deformation of the composite plate is retained, while the elastic deformation is elastically recovered, resulting in stress redistribution inside the composite plate, so that the shape and size of the composite plate after rebound change accordingly.

[0044] The composite plate formed by combining the damping layer 2 with the above thickness and the two metal layers 1 has a high damping factor and a good damping and noise reduction effect as a whole.

[0045] The peel strength of the composite panel is measured by the peel strength between the upper metal layer 1 and the lower metal layer 1. When the peel strength of the composite panel is greater than or equal to 50 N / cm, the composite panel can be stamped and formed according to stamping requirements without cracking, thereby increasing the molding versatility of the composite panel.

[0046] In one embodiment, the metal layer 1 can be an aluminum plate, and the two layers of aluminum plates are bonded by the damping layer 2, so that the composite plate has a lower stamping rebound elasticity; the aluminum plate produces elastic deformation during stamping bending, and the aluminum plate will rebound after the stamping force is unloaded, and the viscoelasticity of the damping layer 2 can prevent the rebound of the aluminum plate. Specifically, the damping layer 2 can produce hysteresis and mechanical loss under the action of stress to achieve the effect of preventing the aluminum plate from rebounding, so that the rebound angle of the composite plate is within the range of 3.0-4.7.

[0047] In one embodiment, the thickness of the metal layer 1 is in the range of 0.5 mm to 1.2 mm.

[0048] In this embodiment, see Figure 1 The thickness of the metal layer 1 can be d1. The metal layer 1 has a low yield strength and a high elasticity. When the thickness of the metal layer 1 is controlled within the range of 0.5 mm to 1.2 mm, the rebound amount of the composite plate can be reduced while ensuring the strength of the composite plate.

[0049] In one embodiment, the metal layer 1 is an aluminum alloy layer, and the yield strength ratio of the aluminum alloy layer is less than 0.5.

[0050] In this embodiment, the yield strength ratio of the aluminum alloy layer is the ratio of the yield strength σs to the tensile strength σb of the aluminum alloy layer. The yield strength ratio of the aluminum alloy layer satisfies the following formula:

[0051] σs / σb<0.5

[0052] In the composite plate in which the two aluminum alloy layers are connected by the damping layer 2, the composite plate is more easily formed into complex shapes and structures during the processing, so that complex parts and structures can be obtained through the composite plate; and the aluminum alloy layer is more likely to disperse stress through uniform deformation, thereby reducing the risk of stress concentration, which helps to reduce the risk of fracture of the composite plate in the stress concentration area.

[0053] Specifically, the yield strength ratio test method of the aluminum alloy layer is obtained using "GB / T 228.1-2010 Tensile tests on metallic materials - Part 1: Room temperature test methods". Specifically, the tension-displacement curve (also called tensile curve) of the aluminum alloy layer is obtained from a tensile testing machine, and the maximum tension (i.e., tensile strength) when the aluminum alloy layer breaks and the tension at the yield point (i.e., yield strength) are recorded. The yield strength ratio is the ratio of yield strength to tensile strength.

[0054] Specifically, the aluminum alloy layer can be prepared by using a first-series aluminum alloy, a second-series aluminum alloy, a third-series aluminum alloy, a fourth-series aluminum alloy, a fifth-series aluminum alloy, a sixth-series aluminum alloy or a seventh-series aluminum alloy material.

[0055] In one embodiment, the composite panel has an elongation greater than or equal to 20%.

[0056] In this embodiment, the elastic modulus of the metal layer 1 can be in the range of 65-75GPa, and the elongation of the composite plate is greater than or equal to 20%, so that the composite plate can be deformed more easily and not easily broken when subjected to external force, thereby exhibiting better flexibility; and the composite plate can have good deformation ability, and when impacted, it can absorb more energy, reducing the degree of damage to the composite plate caused by the impact.

[0057] Therefore, the composite board is easier to perform operations such as stamping, bending and folding during the processing process, and is not prone to cracking during stamping, ensuring the diversity and stability of the composite board forming.

[0058] Specifically, the elongation of composite plates is determined using the method described in GB / T 228.1-2010, Metallic Materials - Tensile Tests - Part 1: Room Temperature Test Methods. A tensile force is applied to the composite plate specimen using a tensile testing machine. During the tensile process, the machine automatically records data such as force and displacement, and an extensometer measures the specimen's deformation.

[0059] When the composite plate specimen breaks, the tensile testing machine will stop working.

[0060] The elongation δ of the composite plate is:

[0061] δ=((l1-l0) / l0)×100%

[0062] Among them, l1 is the length of the composite plate when it breaks, and l0 is the length of the composite plate before stretching.

[0063] In one embodiment, the damping layer 2 is one or a combination of a nitrile rubber layer, a butyl rubber layer and an epoxy resin layer.

[0064] In this embodiment, the nitrile rubber layer, the butyl rubber layer and the epoxy resin layer can all achieve good bonding effects with the metal layer, thereby ensuring the bonding strength between the two metal layers 1 in the composite plate and improving the structural integrity of the composite plate.

[0065] In one embodiment, the thickness of the damping layer 2 is in the range of 40 μm to 80 μm.

[0066] In this embodiment, when the thickness of the damping layer 2 is 40-80 μm, for example, setting the thickness of the damping layer 2 to 50 μm, 60 μm or 70 μm, the damping and noise reduction effect of the entire composite plate can be increased.

[0067] When the damping layer 2 is too thin, for example, the thickness of the damping layer 2 is less than 40 μm, the damping factor of the composite plate is low, which affects the noise reduction effect of the composite plate; when the damping layer 2 is too thick, for example, the thickness of the damping layer 2 is greater than 80 μm, since the damping layer 2 is arranged between the two metal layers 1, the stamping performance and peeling strength of the composite plate will be reduced.

[0068] An embodiment of the present application further provides a forming structure, which includes the above-mentioned composite plate.

[0069] In this embodiment, the molding structure can use composite plates to make the shell or box of the molding structure. Specifically, the molding structure can be applied to vehicles, for example, the molding structure can use composite plates to make the vehicle body or powertrain structural parts.

[0070] The composite plate of the molding structure includes two metal layers 1, which are stacked; a damping layer 2, which is arranged between the two metal layers 1 to connect the two metal layers 1; the ratio of the thickness of the metal layer 1 to the thickness of the damping layer 2 is greater than or equal to 8.3 and less than 25, thereby ensuring the molding quality and precision of the composite plate and reducing the scrap rate of the composite plate molding.

[0071] An embodiment of the present application also provides a vehicle, which includes the above-mentioned molding structure.

[0072] The composite board provided in the embodiments of the present application is described below through specific examples and comparative examples.

[0073] In the following embodiments and comparative examples, the metal layer is an aluminum alloy layer obtained from a six-series aluminum alloy, the damping layer is a nitrile rubber layer, the damping layer is arranged between the two metal layers to connect the two metal layers, and the thickness of the metal layer is the thickness of a single metal layer.

[0074] Example 1

[0075] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.5 mm, and the thickness of the damping layer is 0.06 mm.

[0076] Example 2

[0077] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.06 mm.

[0078] Example 3

[0079] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 1.2 mm, and the thickness of the damping layer is 0.06 mm.

[0080] Example 4

[0081] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.04 mm.

[0082] Example 5

[0083] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.06 mm.

[0084] Example 6

[0085] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.08 mm.

[0086] Example 7

[0087] The yield strength ratio of the metal layer is 0.50, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.06 mm.

[0088] Example 8

[0089] The yield strength ratio of the metal layer is 0.52, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.06 mm.

[0090] Comparative Example 1

[0091] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.2 mm, and the thickness of the damping layer is 0.06 mm.

[0092] Comparative Example 2

[0093] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.032 mm.

[0094] Comparative Example 3

[0095] The yield strength ratio of the metal layer is 0.46, the thickness of the metal layer is 0.8 mm, and the thickness of the damping layer is 0.1 mm.

[0096] Test method:

[0097] The composite panels obtained from the above examples and comparative examples were tested.

[0098] 1. Peel strength test

[0099] 1 Tensile testing device

[0100] 1.1 Experimental Notes

[0101] A device capable of separating the grips and applying tensile force at a constant rate over a wide load range should be used. This device should be equipped with a force measurement system and an indication and recording system. The force indication error should not exceed 2%, and the response time of the entire device should be sufficiently short to not affect measurement accuracy. This means that the applied force can be measured when the bonded specimen fails. The specimen failure load should be between 10% and 80% of the full load.

[0102] 1.2 Chuck

[0103] The chuck can firmly clamp the sample, specifically the upper and lower chucks clamp the two metal layers respectively.

[0104] 2 Test Methods

[0105] 2.1 Sampling

[0106] Randomly select a damping board from the test unit as a sample product; cut off the head and tail of the sample product, the cut portion should be no less than 150mm; then cut a 150mm wide test piece from both ends. Cut off both sides of the test piece, the cut portion should be no less than 50mm, and divide the remaining portion into four equal parts to produce a sample blank with a length × width = 150mm × 25mm.

[0107] 2.2 Sample preparation

[0108] Clamp the sample in a bench vise, tighten, lock and keep it vertical, leaving 50mm above the vise surface. Split it from the middle of the bonding surface and flatten it. The split part should be perpendicular to the remaining part. The test sample should be T-shaped before it can be used for testing.

[0109] 2.3 Test speed

[0110] The T-peel strength of the shock-absorbing plate was tested using a material tensile testing machine at a test tensile speed of 100 mm / min.

[0111] 2.4T-type peel strength test

[0112] 2.5 Test results

[0113] For each specimen, measure the average peel force in N from the peel force vs. peel length curve. The peel length for calculating the peel force must be at least 75 mm, excluding the initial uneven section. The average peel force can be obtained using an estimated contour line or the planimetric method. Other appropriate methods may be used if more accurate results are required.

[0114] After obtaining the average peel force, the T-peel strength can be calculated according to formula (1). The test results are expressed as the arithmetic mean of the peel strength.

[0115] t=F / W........................(1)

[0116] Where:

[0117] t - peel strength, in Newton per centimeter (N / cm);

[0118] F——average peel force, in Newton (N);

[0119] W——specimen width, in millimeters (mm)

[0120] Two- and three-point bending tests

[0121] The three-point bending test uses a metal sheet with a size of 25 mm × 150 mm × t mm (t is the thickness of the sheet). The bending test is carried out on an electronic universal testing machine. The three-point bending mold used is shown in the figure.

[0122] During the bending test, a punch speed of 20 mm / min was used to press the sheet metal to bending angles of 60°, 90°, and 120°. The downward displacement of the punch was recorded and used for subsequent tests of each bending angle. After pressing to the specified displacement, the punch stopped descending and the actual bending angle α after each bending was measured with a digital angle ruler. After measurement, the sheet metal was unloaded and the bent part rebounded. The angle α' after rebound was measured again, and the rebound angle α = α'-α was calculated.

[0123] Table 1 Test results of the composite panels obtained from the above examples and comparative examples

[0124]

[0125]

[0126] Note: The thickness of the single metal layer is d1, and the thickness of the damping layer 2 is d2.

[0127] The specific operation of bending the composite plate is to fix most of the area of ​​the composite plate and bend a small part of the exposed part. During the bending process, the two metal layers have different degrees of bending deformation, and observe whether the two metal layers are delaminated at the extreme edges of the bending.

[0128] From the table above we can see that:

[0129] In Examples 1 to 8, the ratio of the thickness of the metal layer to the thickness of the damping layer is greater than or equal to 8.3 and less than 25, ensuring low rebound of the metal layer during stamping of the composite plate and maintaining the forming quality of the composite plate.

[0130] In Examples 2 to 5, the ratio of the thickness of the metal layer to the thickness of the damping layer is in the range of 13.3 to 20, which can ensure that the rebound angle of the composite plate is in the range of 3.0-4.7, the damping factor of the composite plate is in the range of 0.2-0.4, the peel strength between the two metal layers is greater than or equal to 50 N / cm, and the elongation of the composite plate is greater than 20%.

[0131] By comparing Example 2, Example 7 and Example 8, it can be found that as the yield ratio increases, the springback angle gradually increases. When the yield ratio is 0.5, the springback angle is 5°, which is a relatively large springback. Therefore, the yield ratio is preferably less than 0.5.

[0132] Comparing Examples 1 to 3 and Comparative Example 1, the thickness ratio of Comparative Example 1 is 3.3, the springback angle is too large, and the elongation of the composite plate is only 18.8%; the thickness ratio of Example 1 is 8.3, and the springback angle is 4.9, which meets the low rebound requirement; Comparing Examples 1 to 3, when the thickness of the damping layer 2 remains unchanged, as the thickness of the aluminum plate increases, the thickness ratio increases and the springback angle decreases, so the thickness ratio needs to be greater than or equal to 8.3;

[0133] Comparison Examples 4 to 6 and Comparative Example 2; the thickness ratio of Comparative Example 2 is 25, and the rebound angle is 5.0; Comparison Examples 4 to 6, as the thickness of the damping layer increases, the thickness ratio decreases, and at the same time, the effect of the damping layer on the rebound becomes greater and greater, and the rebound angle becomes smaller and smaller, so it is necessary to control the thickness ratio to be less than 25;

[0134] Comparing Example 2 and Comparative Example 3, the thickness of the damping layer 2 in Comparative Example 3 is too large, resulting in a peel strength of the composite plate of only 33 N / cm, which easily causes delamination during the bending process of the composite plate, and the elongation of the composite plate is only 19.5%.

[0135] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A composite board, characterized in that: include: Two metal layers (1), the two metal layers (1) are stacked; a damping layer (2), the damping layer (2) being arranged between the two metal layers (1) to connect the two metal layers (1); The ratio of the thickness of the metal layer (1) to the thickness of the damping layer (2) is greater than or equal to 8.3 and less than 25.

2. The composite panel according to claim 1, wherein: The ratio of the thickness of the metal layer (1) to the thickness of the damping layer (2) is in the range of 13.3-20.

3. The composite panel according to claim 1, wherein: The range of the rebound angle of the composite plate is 3.0-4.7, the range of the damping factor of the composite plate is 0.2-0.4, and the peel strength between the two metal layers (1) is greater than or equal to 50N / cm.

4. The composite panel according to claim 1, wherein The thickness of the metal layer (1) ranges from 0.5 mm to 1.2 mm.

5. The composite panel according to claim 1, wherein: The metal layer (1) is an aluminum alloy layer, and the yield strength ratio of the aluminum alloy layer is less than 0.

5.

6. The composite panel according to claim 1, wherein: The elongation of the composite plate is greater than or equal to 20%.

7. The composite panel according to claim 1, wherein: The damping layer (2) is one or a combination of a nitrile rubber layer, a butyl rubber layer and an epoxy resin layer.

8. The composite panel according to claim 1, wherein: The thickness of the damping layer (2) ranges from 40 μm to 80 μm.

9. A molding structure, characterized in that: The composite board comprises the composite board according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the forming structure described in claim 9.

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