Composite board, forming structure and vehicle

Abstract

The utility model provides a composite board, a forming structure and a vehicle, the composite board comprises a first metal layer and a second metal layer, and the first metal layer and the second metal layer are stacked; the damping layer is arranged between the first metal layer and the second metal layer so as to connect the first metal layer and the second metal layer; the ratio of the elongation of the first metal layer to the elongation of the second metal layer ranges from 0.5 to 1, and the ratio of the thickness of the first metal layer to the thickness of the second metal layer ranges from 1 to 3, so that the mechanical property of the composite board is better, the punch forming requirement of the composite board is guaranteed, and the forming diversity of the composite board is improved.

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, damping composite panels are often used for sound insulation and noise reduction. At the same time, in order to match the shape diversity of the formed structure, damping composite panels generally need to be bent and deformed.

[0003] However, due to its low elongation and poor stamping performance, damping composite panels are difficult to form into complex shapes during processing, which limits the diversity of damping composite panel forming. 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] a first metal layer and a second metal layer, wherein the first metal layer and the second metal layer are stacked;

[0007] a damping layer, the damping layer being disposed between the first metal layer and the second metal layer to connect the first metal layer and the second metal layer;

[0008] A ratio of an elongation of the first metal layer to an elongation of the second metal layer is in a range of 0.5-1, and a ratio of a thickness of the first metal layer to a thickness of the second metal layer is in a range of 1-3.

[0009] Optionally, the thickness of the second metal layer is in the range of 0.4 mm to 0.8 mm.

[0010] Optionally, a ratio of the density of the first metal layer to the density of the second metal layer is less than or equal to 40%.

[0011] Optionally, the damping layer is one or a combination of a nitrile rubber layer, a butyl rubber layer and an epoxy resin layer.

[0012] Optionally, the peel strength between the first metal layer and the second metal layer is greater than or equal to 80 N / cm.

[0013] Optionally, the thickness of the damping layer is in the range of 30 μm to 80 μm.

[0014] Optionally, the damping factor of the composite plate is in the range of 0.15-0.40.

[0015] Optionally, the first metal layer is an aluminum alloy layer, and the second metal layer is a steel layer.

[0016] Optionally, the yield strength of the composite plate is in the range of 101 MPa-112 MPa, the elongation of the composite plate is in the range of 21.2%-26.8%, and the springback angle of the composite plate is less than or equal to 5°.

[0017] Optionally, the yield strength of the first metal layer is greater than or equal to 90 MPa, the elongation of the first metal layer is greater than or equal to 20%, and the elastic modulus of the first metal layer is greater than or equal to 70 GPa;

[0018] The yield strength of the second metal layer is greater than or equal to 150 MPa, the elongation of the second metal layer is greater than or equal to 40%, and the elastic modulus of the second metal layer is within the range of 150-250 GPa.

[0019] According to a second aspect of the present invention, a forming structure is provided, comprising the composite board described in the first aspect.

[0020] According to a third aspect of the present invention, a vehicle is provided, comprising the molding structure described in the second aspect.

[0021] One of the technical effects of the present invention is:

[0022] An embodiment of the present application provides a composite plate, which includes a first metal layer and a second metal layer, which are stacked; a damping layer, which is arranged between the first metal layer and the second metal layer to connect the first metal layer and the second metal layer; the ratio of the elongation of the first metal layer to the elongation of the second metal layer is in the range of 0.5-1, and the ratio of the thickness of the first metal layer to the thickness of the second metal layer is in the range of 1-3, so as to improve the mechanical properties of the composite plate, ensure the stamping forming requirements of the composite plate, and improve the diversity of the composite plate forming.

[0023] 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

[0024] 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.

[0025] Figure 1 A schematic diagram of a composite board provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Reference Figure 1, an embodiment of the present application provides a composite plate, the composite plate comprising:

[0033] A first metal layer 1 and a second metal layer 3, wherein the first metal layer 1 and the second metal layer 3 are stacked;

[0034] The damping layer 2 is provided between the first metal layer 1 and the second metal layer 3 to connect the first metal layer 1 and the second metal layer 3;

[0035] The ratio of the elongation of the first metal layer 1 to the elongation of the second metal layer 3 is in the range of 0.5-1, and the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is in the range of 1-3.

[0036] In this embodiment, the first metal layer 1 and the second metal layer 3 are stacked to form a layered structure on both sides of the composite plate to protect the composite plate.

[0037] The damping layer 2 is arranged between the first metal layer 1 and the second metal layer 3 to form a three-layered "sandwich" structure of the composite plate. The damping layer 2 can bond the first metal layer 1 and the second metal layer 3 to ensure the structural integrity of the composite plate. At the same time, the first metal layer 1 and the second metal layer 3 sandwich the damping layer 2 in the middle, and the damping layer 2 can provide shock absorption and noise reduction effects, so that the composite plate meets the damping and noise reduction effects.

[0038] In this embodiment, the ratio of the elongation of the first metal layer 1 to the elongation of the second metal layer 3 is in the range of 0.5-1, and the elongation of the first metal layer 1 is less than the elongation of the second metal layer 3. For example, the ratio of the elongation of the first metal layer 1 to the elongation of the second metal layer 3 is between 50% and 62.5%, so that the mechanical properties of the composite plate are better. For example, the elongation of the composite plate is greater than or equal to 20%, and the cupping value is larger, which meets the stamping forming requirements of the composite plate and improves the diversity of composite plate forming.

[0039] In this embodiment, the elongation of the first metal layer 1 can be δ1, and the elongation of the second metal layer 3 can be δ2. If δ1 / δ2 is too low, for example, δ1 / δ2 is less than 50%, the first metal layer 1 and / or the second metal layer 3 are prone to cracking when the composite plate is stamped, resulting in a decrease in the mechanical property elongation of the composite plate, and the cupping value of the composite plate will also decrease.

[0040] At the same time, the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is in the range of 1-3. Since the elongation of the first metal layer 1 is less than that of the second metal layer 3, the elongation of the composite plate can be improved by increasing the thickness of the first metal layer 1 to ensure that the stamping performance of the plate is met.

[0041] In one embodiment, the first metal layer 1 is an aluminum plate, and the second metal layer 3 is a steel plate. When the composite plate is in use, the aluminum plate faces outward and is directly exposed to the outside, while the steel plate faces inward and is also hidden. If the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is too small, for example, the thickness of the aluminum plate is less than the thickness of the steel plate, the outer aluminum plate is more likely to crack when the composite plate is stamped, resulting in a decrease in the cupping value of the composite plate.

[0042] As the thickness of the aluminum plate increases, for example, the thickness of the aluminum plate is greater than that of the steel plate, the deformation of the outer aluminum plate during stamping of the composite plate is more uniform, and thinning and cracking will not occur, which is more conducive to the transmission and dispersion of the deformation of the composite plate.

[0043] It is worth noting that since the elastic modulus of the aluminum plate itself is only 1 / 3 of that of the steel plate, the composite plate is more likely to rebound when bent, and the thinner the aluminum plate, the greater the rebound. Therefore, if the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is too small, for example, the thickness of the aluminum plate is less than the thickness of the steel plate, the large difference in the rebound values ​​of the two dissimilar metals, aluminum plate and steel plate, will cause uneven stress distribution on the composite plate. When the stress difference is large and exceeds the peel strength of the first metal layer 1 and the second metal layer 3, the size and shape accuracy of the composite plate will be reduced; and when the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is too large, for example, the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is greater than 3, the aluminum plate is thicker than the steel plate, and the strength of the composite plate is reduced due to the low proportion of the steel plate.

[0044] In this embodiment, the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is in the range of 1-3, which ensures better stamping formability of the composite plate, keeps the composite plate from cracking and keeps the shape and size stable. Specifically, the springback angle of the composite plate is smaller and the cupping value is larger. For example, the springback angle of the composite plate is less than or equal to 5°, and the cupping value of the composite plate is greater than or equal to 9.45.

[0045] In one embodiment, the composite plate can be used as the upper cover plate of the electronic control component in the vehicle. During the driving of the vehicle, the upper cover plate of the electronic control component is prone to resonance and noise. The composite plate provided in the embodiment of the present application can optimize the noise of the upper cover plate and improve the NVH (Noise, Vibration, Harshness) performance of the vehicle.

[0046] The composite plate provided in the embodiment of the present application includes a first metal layer 1 and a second metal layer 3, which are stacked; a damping layer 2, which is arranged between the first metal layer 1 and the second metal layer 3 to connect the first metal layer 1 and the second metal layer 3; the ratio of the elongation of the first metal layer 1 to the elongation of the second metal layer 3 is in the range of 0.5-1, and the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is in the range of 1-3, so as to make the mechanical properties of the composite plate better, ensure the stamping forming requirements of the composite plate, and improve the diversity of the composite plate forming.

[0047] In one embodiment, the thickness of the second metal layer 3 is in the range of 0.4 mm to 0.8 mm.

[0048] In this embodiment, see Figure 1 The thickness of the first metal layer 1 can be d1, and the thickness of the second metal layer 3 can be d2. Since the second metal layer 3 has greater rigidity and good elongation, when the thickness of the second metal layer 3 is controlled in the range of 0.4mm-0.8mm, the elongation of the composite plate can be improved while ensuring the strength of the composite plate.

[0049] In one embodiment, the sum of the thickness of the first metal layer 1 and the thickness of the second metal layer 3 is 1.6 mm, and the thickness of the second metal layer 3 is controlled to be above 0.4 mm and less than or equal to 0.8 mm to ensure that the composite plate has sufficient strength; when the thickness of the second metal layer 3 is less than 0.4 mm, the strength of the composite plate is too low, and when the thickness of the second metal layer 3 is greater than 0.8, the thickness of the first metal layer 1 is small, the thinning, cracking and rebound of the first metal layer 1 are increased, and it is easy to cause poor stamping of the composite plate.

[0050] In one embodiment, the ratio of the density of the first metal layer 1 to the density of the second metal layer 3 is less than or equal to 40%.

[0051] In this embodiment, since the thickness of the first metal layer 1 is greater than or equal to the thickness of the second metal layer 3, a low-density material is used to prepare the first metal layer 1, which can not only reduce the weight of the composite plate and meet the lightweight requirements of the composite plate, but also ensure the structural strength of the composite plate.

[0052] 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.

[0053] In this embodiment, the nitrile rubber layer, the butyl rubber layer and the epoxy resin layer can all achieve good bonding effects with metals, ensuring the bonding strength of the first metal layer 1 and the second metal layer 3 in the composite plate and improving the structural integrity of the composite plate.

[0054] In one embodiment, the peel strength between the first metal layer 1 and the second metal layer 3 is greater than or equal to 80 N / cm.

[0055] In this embodiment, the peel strength of the composite plate is reflected by the peel strength between the first metal layer 1 and the second metal layer 3. When the peel strength of the composite plate is greater than or equal to 80 N / cm, the composite plate can be punched and formed according to the punching requirements without cracking, thereby improving the forming diversity of the composite plate.

[0056] In this embodiment, when testing the peel strength of the composite panel, two clamps can be used to clamp the first metal layer 1 and the second metal layer 3, respectively. The two clamps are moved away from each other to gradually peel the first metal layer 1 and the second metal layer 3 apart. The average peel force is measured from the peel force vs. peel length curve, in units of N.

[0057] The peel strength t satisfies the following formula:

[0058] t=F / W........................(1)

[0059] Where:

[0060] t - peel strength, in Newton per centimeter (N / cm);

[0061] F——average peel force, in Newton (N);

[0062] W——specimen width, in millimeters (mm).

[0063] In one embodiment, the thickness of the damping layer 2 is in the range of 30 μm to 80 μm.

[0064] In this embodiment, the thickness of the damping layer 2 is controlled within the range of 30 μm to 80 μm, for example, setting the thickness of the damping layer 2 to 40 μm, 50 μm, 60 μm, or 70 μm, which can enhance the damping and noise reduction effect of the composite panel as a whole. However, if the damping layer 2 is too thin, for example, if the thickness of the damping layer 2 is less than 30 μm, the noise reduction effect of the composite panel is affected. If the damping layer 2 is too thick, for example, if the thickness of the damping layer 2 is greater than 80 μm, the stamping performance and peel strength of the composite panel will be reduced due to the damping layer 2 being disposed between the first metal layer 1 and the second metal layer 3.

[0065] In one embodiment, the composite panel has a damping factor in the range of 0.15-0.40.

[0066] In this embodiment, the damping factor of the composite plate can be maintained at a level greater than or equal to 0.15, which can increase the overall damping and noise reduction effect of the composite plate. When the damping factor of the composite plate is low, for example, when the damping layer 2 of the composite plate is too thin, the damping factor of the composite plate will be less than 0.15, affecting the noise reduction effect of the composite plate; and when the damping layer 2 of the composite plate is too thick, the damping factor of the composite plate will be large, for example, when the damping factor of the composite plate is greater than 0.40, the composite plate will absorb and dissipate more energy when subjected to external force, and the composite plate will not be able to return to its original shape, resulting in a decrease in the stamping performance of the composite plate; and after the composite plate absorbs energy and deforms, the bonding force between the damping layer and the metal layer will be weakened, resulting in a decrease in the peel strength of the composite plate. Moreover, when the damping layer 2 is too thick, the uniformity of the damping layer 2 during the preparation process is poor, and the voids in the damping layer 2 will increase, thereby affecting the stamping performance and peel strength of the composite plate.

[0067] In a specific embodiment, when the thickness of the damping layer 2 is 50 μm, the damping factor of the composite plate is approximately 0.25; when the thickness of the damping layer 2 is 30 μm, the damping factor of the composite plate is approximately 0.15; when the thickness of the damping layer 2 is 30 μm and the thickness of the first metal layer 1 and the second metal layer 3 is 3, the damping factor of the composite plate is 0.15; when the thickness ratio of the first metal layer 1 to the second metal layer 3 is less than 3, the damping factor of the composite plate will be greater than 0.15; when the thickness ratio of the first metal layer 1 to the second metal layer 3 is greater than 3, since the damping factor of the first metal layer 1 is lower than the damping factor of the second metal layer 3, the damping factor of the composite plate will decrease slightly, that is, the damping factor of the composite plate will be lower than 0.15.

[0068] In one embodiment, the damping layer 2 can be coated on one side surface of the first metal layer 1 , and the second metal layer 3 is rolled and laminated on the baked surface of the damping layer 2 .

[0069] In this embodiment, a damping layer is disposed on one surface of the first metal layer; the damping layer is baked; a second metal layer is adhered to the side of the damping layer away from the first metal layer, and the second metal layer is rolled, which is beneficial to improving the peel strength of the composite plate and ensuring the structural stability of the layered structure in the composite plate.

[0070] In one embodiment, the first metal layer 1 is an aluminum alloy layer, and the second metal layer 3 is a steel layer. By combining the aluminum alloy and the steel, the weight of the composite plate can be reduced while ensuring the strength of the composite plate.

[0071] In one embodiment, the yield strength of the composite plate ranges from 101 MPa to 112 MPa, the elongation of the composite plate ranges from 21.2% to 26.8%, and the springback angle of the composite plate is less than or equal to 5°, thereby improving the stamping performance of the composite plate while ensuring the strength of the composite plate.

[0072] In this embodiment, the yield strength of the first metal layer 1 formed by the aluminum alloy layer is greater than or equal to 90 MPa, the elongation of the first metal layer 1 is greater than or equal to 20%, and the elastic modulus of the first metal layer 1 is greater than or equal to 70 GPa; the yield strength of the second metal layer 3 formed by the steel layer is greater than or equal to 150 MPa, the elongation of the second metal layer 3 is greater than or equal to 40%, and the elastic modulus of the second metal layer 3 is in the range of 150-250 GPa, which can not only reduce the weight of the composite plate, but also meet the strength requirements of the composite plate and ensure the structural strength of the composite plate.

[0073] In one embodiment, the steel layer is one of electro-galvanized steel sheet, aluminized steel sheet and stainless steel.

[0074] In one embodiment, when the composite plate is in use, the surface of the aluminum alloy layer away from the damping layer 2 is the exposed surface. The aluminum alloy layer is the layer of the composite plate in contact with the outside world. Since the aluminum alloy layer has good corrosion resistance, the composite plate can have good stability without surface treatment, thereby reducing the protection cost of the composite plate.

[0075] Specifically, the aluminum alloy layer can be prepared 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; the stainless steel layer can be prepared using 302 stainless steel, 303 stainless steel, 304 stainless steel, 305 stainless steel, 309 stainless steel, 310 stainless steel, 316 stainless steel or 317 stainless steel material.

[0076] In one embodiment, the composite board forming process further includes:

[0077] The first metal layer, the damping layer and the second metal layer are heated and cured.

[0078] In this embodiment, after the first metal layer and the second metal layer are rolled together, they can enter a drying tunnel together for heating and curing to ensure the bonding effect of the damping layer on the first metal layer and the second metal layer.

[0079] The present application also provides a composite plate forming process, which is applied to the composite plate described above. The composite plate forming process includes:

[0080] S101, disposing a damping layer on one side surface of the first metal layer;

[0081] S102, baking the damping layer;

[0082] S103 , attaching the second metal layer to the side of the damping layer away from the first metal layer.

[0083] In this embodiment, the damping layer is baked and then the second metal layer is laminated to the first metal layer. After lamination, the second metal layer is rolled, which is beneficial to improving the peel strength of the composite board.

[0084] However, when the baking and rolling temperatures are too low and the rolling pressure is too low, it is easy to cause insufficient infiltration between the damping layer and the metal layer; when the baking and rolling temperatures are too high, the damping layer is easy to carbonize, which will reduce the damping effect of the composite plate. Moreover, when the rolling pressure is too high, it is easy to cause the damping layer to overflow the gap between the second metal layer and the first metal layer, reducing the actual thickness of the damping layer.

[0085] An embodiment of the present application further provides a forming structure, which includes the above-mentioned composite plate.

[0086] 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.

[0087] The composite plate of the forming structure includes a first metal layer 1 and a second metal layer 3, which are stacked; a damping layer 2, which is arranged between the first metal layer 1 and the second metal layer 3 to connect the first metal layer 1 and the second metal layer 3; the ratio of the elongation of the first metal layer 1 to the elongation of the second metal layer 3 is in the range of 0.5-1, and the ratio of the thickness of the first metal layer 1 to the thickness of the second metal layer 3 is in the range of 1-3, so as to make the mechanical properties of the composite plate better, ensure the stamping forming requirements of the composite plate, and improve the diversity of the forming structure.

[0088] An embodiment of the present application also provides a vehicle, which includes the above-mentioned molding structure.

[0089] The composite board provided in the embodiments of the present application is described below through specific examples and comparative examples.

[0090] In the following embodiments and comparative examples, the first metal layer is an aluminum alloy layer obtained from a six-series aluminum alloy, the second metal layer is a stainless steel layer obtained from 304 stainless steel, the damping layer is a nitrile rubber layer, and the thickness of the damping layer is 50 μm.

[0091] Example 1

[0092] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 40%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0093] Example 2

[0094] The elongation of the aluminum alloy layer is 20%, the elongation of the stainless steel layer is 40%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0095] Example 3

[0096] The elongation of the aluminum alloy layer is 20%, the elongation of the stainless steel layer is 35%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0097] Example 4

[0098] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 1.2 mm, and the thickness of the stainless steel layer is 0.4 mm.

[0099] Example 5

[0100] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0101] Example 6

[0102] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 0.8 mm, and the thickness of the stainless steel layer is 0.8 mm.

[0103] Comparative Example 1

[0104] The elongation of the aluminum alloy layer is 15%, the elongation of the stainless steel layer is 40%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0105] Comparative Example 2

[0106] The elongation of the aluminum alloy layer is 20%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 1 mm, and the thickness of the stainless steel layer is 0.6 mm.

[0107] Comparative Example 3

[0108] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 1.4 mm, and the thickness of the stainless steel layer is 0.2 mm.

[0109] Comparative Example 4

[0110] The elongation of the aluminum alloy layer is 25%, the elongation of the stainless steel layer is 45%, the thickness of the aluminum alloy layer is 0.6 mm, and the thickness of the stainless steel layer is 1.0 mm.

[0111] Test method:

[0112] The composite panels obtained from the above examples and comparative examples were tested.

[0113] 1. Mechanical tensile test

[0114] The yield strength and elongation of the material were tested using GB / T 228.1-2010 Tensile tests on metallic materials, Part 1: Test methods at room temperature.

[0115] The above-mentioned test sample is stretched to form a tensile test bar. The test sample includes an aluminum alloy layer, a stainless steel layer and a composite plate. The size of the tensile test bar is 6.4 mm in diameter and 50 mm in gauge length. The tensile performance test is carried out using an electronic universal testing machine model CMT5105 with a gauge length of 50 mm and a loading rate of 2 mm / min. The measurement data is recorded. Six samples are tested for each recipe point, where the yield strength and elongation are the average of the six data, and the relative standard deviation of the yield strength is the percentage of the standard deviation of the six yield strength data to the average.

[0116] Two- and three-point bending tests

[0117] 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), and the bending test is carried out on an electronic universal testing machine.

[0118] 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.

[0119] 3. Cupping test

[0120] The cupping test simulates forming performance, measuring the ability of a sheet metal to resist localized necking or cracking due to thickness reduction under biaxial tensile stress. The cupping test uses the material bulging depth, h, as a performance indicator for the bulging process. During the test, there is a certain amount of material flow into the die cavity, not pure bulging, but with some characteristics of a stretching process. This is closer to the actual bulging process in production, and the data closely reflects actual conditions.

[0121] Table 1 Cupping test table

[0122]

[0123] Table 2 Test results of the composite panels obtained from the above examples and comparative examples

[0124]

[0125]

[0126] Note: The elongation of the first metal layer is δ1, the elongation of the second metal layer is δ2, the thickness of the first metal layer is d1, and the thickness of the second metal layer is d2.

[0127] As shown in Table 2, in Examples 1 to 6, the ratio of the elongation of the first metal layer to the elongation of the second metal layer ranges from 0.5 to 1, and the ratio of the thickness of the first metal layer to the thickness of the second metal layer ranges from 1 to 3. The yield strength of the composite panels ranges from 101 MPa to 112 MPa, and the elongation of the composite panels ranges from 21.2% to 26.8%. The springback angle of the composite panels is less than or equal to 5°, and the cupping value of the composite panels is greater than or equal to 9.45, resulting in improved mechanical properties for the composite panels, ensuring the stamping requirements of the composite panels and increasing the versatility of the composite panel forming process.

[0128] In Comparative Examples 1 and 2, the ratio of the elongation of the first metal layer to the elongation of the second metal layer is less than 50%. For example, the elongation of the first metal layer is too small or the elongation of the second metal layer is too large, resulting in the elongation of the composite plate being less than 20%, affecting the stamping performance of the composite plate.

[0129] In Comparative Example 3, the ratio of the thickness of the first metal layer to the thickness of the second metal layer is greater than 3. For example, the thickness of the second metal layer is too small, resulting in a yield strength of the composite plate of only 95 MPa. The first metal layer is an aluminum alloy layer obtained by a six-series aluminum alloy, and the second metal layer is a stainless steel layer obtained by 304 stainless steel. The thickness of the low-strength aluminum alloy layer is too large, and the thickness of the high-strength stainless steel layer is too small, so the peel strength of the composite plate is only 65 N / cm.

[0130] In Comparative Example 4, the ratio of the thickness of the first metal layer to the thickness of the second metal layer is less than 1. For example, the thickness of the first metal layer is too small, resulting in a springback angle of the composite plate reaching 6.21°, affecting the structural stability of the composite plate after deformation.

[0131] 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: A first metal layer (1) and a second metal layer (3), wherein the first metal layer (1) and the second metal layer (3) are stacked; a damping layer (2), the damping layer (2) being arranged between the first metal layer (1) and the second metal layer (3) to connect the first metal layer (1) and the second metal layer (3); The ratio of the elongation of the first metal layer (1) to the elongation of the second metal layer (3) is in the range of 0.5-1, and the ratio of the thickness of the first metal layer (1) to the thickness of the second metal layer (3) is in the range of 1-3.

2. The composite panel according to claim 1, wherein: The thickness of the second metal layer (3) is in the range of 0.4 mm to 0.8 mm.

3. The composite panel according to claim 1, wherein: The ratio of the density of the first metal layer (1) to the density of the second metal layer (3) is less than or equal to 40%.

4. 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.

5. The composite panel according to claim 1, characterized in that The peel strength between the first metal layer (1) and the second metal layer (3) is greater than or equal to 80 N / cm.

6. The composite panel according to claim 1, wherein: The thickness of the damping layer (2) ranges from 30 μm to 80 μm.

7. The composite panel according to claim 1, wherein: The damping factor of the composite plate is in the range of 0.15-0.

40.

8. The composite panel according to claim 1, wherein: The first metal layer (1) is an aluminum alloy layer, and the second metal layer (3) is a steel layer.

9. The composite panel according to claim 1, wherein: The yield strength of the composite plate is in the range of 101 MPa to 112 MPa, the elongation of the composite plate is in the range of 21.2% to 26.8%, and the springback angle of the composite plate is less than or equal to 5°.

10. The composite panel according to claim 1, wherein The yield strength of the first metal layer (1) is greater than or equal to 90 MPa, the elongation of the first metal layer (1) is greater than or equal to 20%, and the elastic modulus of the first metal layer (1) is greater than or equal to 70 GPa; The yield strength of the second metal layer (3) is greater than or equal to 150 MPa, the elongation of the second metal layer (3) is greater than or equal to 40%, and the elastic modulus of the second metal layer (3) is within the range of 150-250 GPa.

11. A molding structure, characterized in that: The composite board comprises the composite board according to any one of claims 1 to 10.

12. A vehicle, characterized in that: The molding structure comprises the molding structure according to claim 11.

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