Metal composite plate and preparation method and application thereof

Abstract

The invention provides a metal composite plate and a preparation method and application thereof. The metal composite plate comprises a first aluminum alloy layer, a first damping glue layer, a magnesium alloy layer, a second damping glue layer and a second aluminum alloy layer which are sequentially arranged in a stacked mode. And the first damping rubber layer and the second damping rubber layer are independently selected from any one of nitrile rubber, butyl rubber and epoxy resin. According to the metal composite plate, the requirement for light weight can be met while the good damping performance is achieved, the metal composite plate further has good corrosion resistance and metal machining performance, and the application scene of the metal composite plate is widened.

Description

Technical Field

[0001] The present application relates to the field of metal materials, and in particular to a metal composite plate and a preparation method and application thereof. Background Art

[0002] NVH (Noise, Vibration, Harshness) is a general term for various indicators such as automobile noise, vibration and acoustic roughness. The NVH control level has gradually become one of the important indicators for measuring the safety and comfort quality of automobiles. During the driving process of the whole vehicle, the vibration of the vehicle structure will generate noise, which in turn affects the comfort. Improving the damping coefficient of the vehicle can effectively improve the NVH performance of the vehicle, thereby improving the comfort of the whole vehicle. Therefore, the industry usually uses damping composite steel plates to improve the damping coefficient.

[0003] However, the damping composite steel plate still has the following problems: the density of the damping composite steel plate is too large to meet the requirements of lightweight automobile bodies; the corrosion resistance of the damping composite steel plate is poor and surface treatment is required, which increases the manufacturing cost. Summary of the invention

[0004] In view of this, the present application provides a metal composite plate and a preparation method and application thereof, wherein the metal composite plate comprises a first aluminum alloy layer, a first damping rubber layer, a magnesium alloy layer, a second damping rubber layer and a second aluminum alloy layer stacked in sequence. The metal composite plate provided in the present application adopts a stacking structure design of aluminum alloy-magnesium alloy-aluminum alloy, and selects a suitable damping rubber for compounding between the aluminum alloy and the magnesium alloy, so that the metal composite plate can meet the requirements of lightweight while having good shock absorption. The metal composite plate also has good corrosion resistance and metal processing properties, which broadens its application scenarios.

[0005] A first aspect of the present application provides a metal composite plate, which includes a first aluminum alloy layer, a first damping rubber layer, a magnesium alloy layer, a second damping rubber layer and a second aluminum alloy layer stacked in sequence; the material of the first damping rubber layer and the second damping rubber layer is independently selected from any one of nitrile rubber, butyl rubber and epoxy resin.

[0006] In the implementation manner of the present application, the thickness of the first damping adhesive layer is 10 μm-30 μm.

[0007] In the implementation manner of the present application, the thickness of the second damping adhesive layer is 10 μm-30 μm.

[0008] In some embodiments of the present application, the first damping adhesive layer and the second damping adhesive layer are made of the same material.

[0009] In an embodiment of the present application, the thickness ratio of the first aluminum alloy layer to the magnesium alloy layer is 1:(2-6).

[0010] In an embodiment of the present application, the thickness ratio of the second aluminum alloy layer to the magnesium alloy layer is 1:(2-6).

[0011] In the embodiment of the present application, the thickness of the first aluminum alloy layer is 0.2 mm-0.4 mm.

[0012] In the embodiment of the present application, the thickness of the second aluminum alloy layer is 0.2 mm-0.4 mm.

[0013] In the implementation manner of the present application, the total thickness of the metal composite plate is 1.4 mm-2.0 mm.

[0014] In the implementation manner of the present application, the damping coefficient of the metal composite plate is greater than or equal to 0.3.

[0015] In the implementation manner of the present application, the room temperature limit drawing ratio of the metal composite plate is greater than or equal to 1.6.

[0016] The second aspect of the present application provides a method for preparing the metal composite plate provided in the first aspect of the present application, comprising:

[0017] A magnesium alloy is placed between a first aluminum alloy and a second aluminum alloy, a first damping glue is set between the first aluminum alloy and the magnesium alloy, and a second damping glue is set between the second aluminum alloy and the magnesium alloy, and baking treatment, hot pressing composite treatment, and curing treatment are performed in sequence to obtain a metal composite plate.

[0018] In the embodiment of the present application, the temperature of the baking treatment is 100° C.-200° C., and the time of the baking treatment is 5 min-10 min.

[0019] In the implementation manner of the present application, the hot pressing composite is rolling, the rolling temperature is 200° C.-300° C., the rolling pressure is 2 MPa-10 MPa, and the rolling speed is 2 mm / min-10 mm / min.

[0020] In the embodiment of the present application, the temperature of the curing treatment is 150° C.-200° C., and the time of the curing treatment is 2 min-10 min.

[0021] A third aspect of the present application provides a structural member, which includes the metal composite plate provided in the first aspect of the present application or the metal composite plate prepared by the preparation method provided in the second aspect of the present application.

[0022] A fourth aspect of the present application provides a powertrain system, which includes the structural components provided in the third aspect of the present application.

[0023] A fifth aspect of the present application provides a vehicle, which includes the powertrain system provided by the fourth aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the prior art description. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0025] Figure 1 A schematic diagram of the cross-sectional structure of a metal composite plate provided in one embodiment of the present application;

[0026] Figure 2 A flow chart of a method for preparing a metal composite plate provided in one embodiment of the present application;

[0027] Figure 3 A schematic diagram of a production line for a method for preparing a metal composite plate provided in one embodiment of the present application.

[0028] Description of Figure Numbers

[0029] 100-metal composite plate; 101-first aluminum alloy layer; 102-first damping rubber layer; 103-magnesium alloy layer; 104-second damping rubber layer; 105-second aluminum alloy layer; 1-first aluminum coil; 11-first aluminum alloy; 2-magnesium coil; 21-magnesium alloy; 3-second aluminum coil; 31-second aluminum alloy; 4-metal composite coil; 41-metal composite plate; 5-first baking treatment device; 6-second baking treatment device; 7-curing treatment device; 8-first roller coating device; 9-second roller coating device; 10-hot pressing composite device. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] NVH (Noise, Vibration, Harshness) is a general term for various indicators such as automobile noise, vibration and acoustic roughness. The NVH control level has gradually become one of the important indicators for measuring the safety and comfort quality of automobiles. During the driving process of the whole vehicle, the vibration of the vehicle structure will generate noise, which in turn affects the comfort. The powertrain system is one of the most core components of electric vehicles and hybrid vehicles. It is crucial to achieve noise reduction of the powertrain system through material innovation to achieve the comfort of the whole vehicle. Improving the damping coefficient of the powertrain system can effectively improve the NVH performance of the vehicle, thereby improving the comfort of the whole vehicle.

[0032] At present, the industry usually uses damping composite steel plates to improve the damping coefficient. However, the density of the damping composite steel plate is too large, and the use of gas to make structural parts will significantly improve the overall quality of the vehicle, which cannot meet the current industry demand for lightweight automobile bodies. In addition, since the main component of the damping composite steel plate is steel, the surface corrosion resistance is poor and cannot meet the corrosion resistance requirements of the body structure. Subsequent surface treatment processes such as powder spraying, painting, and electrophoresis are required to improve corrosion resistance, thereby extending the production process and increasing production costs. In addition, there are some methods that use aluminum alloys and steel composites to reduce the weight of metal composite plates, but the peeling strength between the metal layers after the composite is low and cannot meet the stamping forming of complex structural parts.

[0033] In view of the above problems, the present application provides a metal composite plate, which includes a first aluminum alloy layer, a first damping rubber layer, a magnesium alloy layer, a second damping rubber layer and a second aluminum alloy layer stacked in sequence. The metal composite plate provided by the present application adopts a stacking structure design of aluminum alloy-magnesium alloy-aluminum alloy, and selects a suitable damping rubber for compounding between the aluminum alloy and the magnesium alloy, so that the metal composite plate can have good shock absorption and meet the requirements of lightweight. The metal composite plate also has good corrosion resistance and metal processing properties, which broadens its application scenarios.

[0034] like Figure 1As shown, the present application provides a metal composite plate 100, which includes a first aluminum alloy layer 101, a first damping rubber layer 102, a magnesium alloy layer 103, a second damping rubber layer 104, and a second aluminum alloy layer 105 stacked in sequence. The metal composite plate provided by the present application is obtained by compounding an aluminum alloy and a magnesium alloy. The density of the magnesium alloy and the aluminum alloy are both less than the density of steel. The metal composite plate obtained by compounding the magnesium alloy and the aluminum alloy in the present application can significantly reduce weight and meet the requirements for lightweight materials in various vibration reduction fields. The density of the magnesium alloy is less than the density of its common metal alloys. The use of magnesium alloy and aluminum alloy for compounding can further reduce the overall mass of the metal composite plate compared to pure aluminum alloy. Compared with aluminum alloy and steel, magnesium alloy has a higher vibration damping capacity and a strong vibration reduction effect. The structural parts made of it can be used in vehicles to meet the vehicle's demand for comfort. In addition, the structure of "aluminum alloy-damping glue-magnesium alloy-damping glue-aluminum alloy" with multiple layers of metal and glue alternately stacked can also achieve a better vibration reduction effect, effectively alleviate the vibration and noise generated during the use of the car, and enhance the user experience. In this application, the first aluminum alloy layer 101 and the second aluminum alloy layer 105 are arranged on the outermost layer of the metal composite plate as the exposed surface during use. This is because aluminum alloy has excellent corrosion resistance compared to magnesium alloy. Using it as the surface metal layer of the metal composite plate can improve the surface performance of the metal composite plate, especially the corrosion resistance, and avoid surface treatment processes such as powder spraying, painting, and electrophoresis to improve the corrosion resistance of the material, thereby shortening the preparation process and reducing production costs. In addition, since the ultimate tensile strength of the magnesium alloy layer 103 at room temperature is relatively small, the stamping forming performance is poor, which is not conducive to the subsequent preparation of complex structural parts at room temperature. By sandwiching the magnesium alloy layer 103 with the first aluminum alloy layer 101 and the second aluminum alloy layer 105, the aluminum alloy can play a role in restraining the deformation of the magnesium alloy and reinforcing the ability of the magnesium alloy to resist deformation, thereby improving the ultimate tensile strength of the metal composite plate at room temperature and the stamping forming performance of the metal composite plate at room temperature. In the subsequent stamping process of preparing structural parts, heating is not required, which shortens the process and saves costs. In the embodiment of the present application, the material of the first damping rubber layer 102 and the second damping rubber layer 104 is independently selected from any one of nitrile rubber, butyl rubber and epoxy resin. On the one hand, the first damping rubber layer 102 and the second damping rubber layer 104 effectively connect the aluminum alloy layer and the magnesium alloy layer, thereby improving the peeling strength between the metal composite plate layers and the overall bonding performance of the metal composite plate layers, thereby avoiding peeling and falling off between the aluminum alloy and the magnesium alloy during subsequent processing such as stamping. On the other hand, the bonding and buffering effect of the damping rubber can effectively alleviate the uneven deformation stress of the magnesium alloy layer 103 and cracking caused by stress concentration, thereby improving the deformation capacity of the metal composite plate, facilitating subsequent forming processing, and broadening its application scenarios.

[0035] In the implementation manner of the present application, the metal composite plate can be a metal processing raw material, which can be subsequently formed and processed according to actual use requirements to obtain corresponding products. In the implementation manner of the present application, there is no requirement for the shape of the metal composite plate. According to different use requirements, the shape of the metal composite plate includes but is not limited to thick plates, foils, and strips (coils).

[0036] In the embodiment of the present application, the thickness of the first damping rubber layer 102 is 10 μm-30 μm, and the thickness of the second damping rubber layer 104 is 10 μm-30 μm. In some embodiments of the present application, the thickness of the first damping rubber layer 102 can be, for example, 10 μm, 12 μm, 14 μm, 15 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 25 μm, 26 μm, 28 μm, 30 μm, and the thickness of the second damping rubber layer 104 can be, for example, 10 μm, 12 μm, 14 μm, 15 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 25 μm, 26 μm, 28 μm, 30 μm. The present application controls the thickness of the damping adhesive layer within a suitable range to ensure that the aluminum alloy layer and the magnesium alloy layer are effectively bonded, while not affecting the mechanical properties of the metal composite plate, so that the metal composite plate has both good mechanical properties and overall bonding.

[0037] In the embodiments of the present application, the thickness of the first damping adhesive layer 102 and the second damping adhesive layer 104 may be the same or different. In some embodiments of the present application, the absolute value of the difference between the thickness of the first damping adhesive layer 102 and the thickness of the second damping adhesive layer 104 is less than or equal to 10 μm. By controlling the thickness of the first damping adhesive layer and the second damping adhesive layer within a relatively close range, the overall mechanical uniformity of the metal composite plate can be further improved.

[0038] In the implementation manner of the present application, the material of the first damping rubber layer 102 is selected from any one of nitrile rubber, butyl rubber and epoxy resin, and the material of the second damping rubber layer 104 is selected from any one of nitrile rubber, butyl rubber and epoxy resin. The materials of the first damping rubber layer and the second damping rubber layer can be the same or different. The present application selects suitable damping rubbers according to the characteristics of the aluminum alloy and magnesium alloy of the metal layer to be combined. These damping rubbers have the advantages of viscoelasticity, oil resistance, aging resistance and high damping ratio. The use of the above damping rubber to prepare the first damping rubber layer and the second damping rubber layer can effectively absorb and dissipate vibration energy. By selecting a suitable damping rubber, the bonding force between the layers of the metal composite plate can be improved, thereby improving the subsequent processing and forming performance of the metal composite plate. In some implementation manners of the present application, the material of the first damping rubber layer 102 and the second damping rubber layer 104 is the same. The use of the same material for the two damping layers can further improve the overall mechanical uniformity of the metal composite plate.

[0039] In the embodiment of the present application, the thickness ratio of the first aluminum alloy layer 101 to the magnesium alloy layer 103 is 1:(2-6), and the thickness ratio of the second aluminum alloy layer 105 to the magnesium alloy layer 103 is 1:(2-6). In some specific embodiments, the thickness ratio of the first aluminum alloy layer 101 to the magnesium alloy layer 103 may be, for example, 1:2, 1:3, 1:4, 1:5, 1:6, and the thickness ratio of the second aluminum alloy layer 105 to the magnesium alloy layer 103 may be, for example, 1:2, 1:3, 1:4, 1:5, 1:6. By controlling the thickness ratio of the aluminum alloy and the magnesium alloy within a suitable range, the present application can ensure that the metal composite plate has the good mechanical properties and corrosion resistance of the aluminum alloy, while using as much magnesium alloy as possible to reduce the weight of the metal composite plate and improve its damping coefficient.

[0040] In the implementation manner of the present application, the thickness of the first aluminum alloy layer 101 is 0.2mm-0.4mm, and the thickness of the second aluminum alloy layer 105 is 0.2mm-0.4mm. In some implementation manners of the present application, the thickness of the first aluminum alloy layer 101 can be, for example, 0.2mm, 0.22mm, 0.24mm, 0.25mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.38mm, 0.4mm, and the thickness of the second aluminum alloy layer 105 can be, for example, 0.2mm, 0.22mm, 0.24mm, 0.25mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.38mm, 0.4mm. The present application can ensure that the metal composite plate has good surface corrosion resistance and good mechanical properties by controlling the thickness of the aluminum alloy layer within a suitable range. In the embodiment of the present application, the thickness of the first aluminum alloy layer 101 and the second aluminum alloy layer 105 may be the same or different. In some embodiments of the present application, the absolute value of the difference between the thickness of the first aluminum alloy layer 101 and the thickness of the second aluminum alloy layer 105 is less than or equal to 0.2nm. In some specific embodiments of the present application, the absolute value of the difference between the thickness of the first aluminum alloy layer 101 and the thickness of the second aluminum alloy layer 105 may be less than or equal to 0.1nm. In some specific embodiments, the absolute value of the difference between the thickness of the first aluminum alloy layer 101 and the thickness of the second aluminum alloy layer 105 may be, for example, 0nm, 0.02nm, 0.03nm, 0.05nm, 0.06nm, 0.08nm, 0.1nm, 0.15nm, 0.2nm. By controlling the thickness of the first aluminum alloy layer and the second aluminum alloy layer within a relatively close range, the overall mechanical uniformity of the metal composite plate can be further improved.

[0041] In the embodiment of the present application, the total thickness of the metal composite plate 100 is 1.4 mm-2.0 mm. In some specific embodiments, the total thickness of the metal composite plate can be, for example, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2.0 mm.

[0042] In the implementation manner of the present application, the damping coefficient of the metal composite plate 100 is greater than or equal to 0.3. In the present application, the test method of the damping coefficient may be a cantilever beam method, the test equipment may be, for example, a vibration damping characteristic test analyzer, and the test standard may be, for example, ASTM E756-05 (Standard Test Method for Measuring Vibration Damping Properties of Materials). In some specific implementation manners of the present application, the damping coefficient of the metal composite plate 100 may be, for example, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.45, 0.5, 0.6. It is generally believed in the field that a damping coefficient greater than or equal to 0.3 is high damping, that is, it has a good damping and vibration reduction effect.

[0043] In the implementation manner of the present application, the room temperature limit drawing ratio of the metal composite plate 100 is greater than or equal to 1.6. The room temperature limit drawing ratio of the present application can be measured by a drawing test at room temperature. The drawing test is also called a deep drawing test, which is a simulated forming test method for evaluating the drawing performance of a material. The drawing performance refers to the ability of a metal sheet to resist cracking at the radius of the punch when the main deformation zone of the flange does not wrinkle during deep drawing. In the present application, the drawing test mainly refers to the Sweet cup test, which uses the limit drawing ratio LDR as a test method for evaluating the drawing performance index of the sheet metal. During the test, metal composite plates of different diameters are placed in a mold, and the test is carried out under specified conditions to determine the maximum blank diameter (D0) of the drawn part under the condition that no cracking occurs. max With the punch diameter d p This ratio is called the limiting drawing ratio and is represented by LDR, that is, LDR = (D0) max / d p The larger the LDR value, the better the drawing performance of the corresponding plate. In some specific embodiments of the present application, the room temperature limit drawing ratio of the metal composite plate 100 can be, for example, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, 1.97, 2, 2.01, 2.05, 2.1, 2.12, 2.15, 2.2, 2.25, 2.3, 2.35, 2.4, 2.5.

[0044] The metal composite plate provided in the present application is formed by sandwiching a magnesium alloy layer between two aluminum alloy layers, and bonding the magnesium alloy layer and the aluminum alloy layer with a suitable damping adhesive. The obtained metal composite plate has good shock absorption and meets the requirements of lightweight. The metal composite plate also has good corrosion resistance and metal processability, which broadens its application scenarios.

[0045] The present application also provides a method for preparing the metal composite plate 100 provided above, comprising:

[0046] A magnesium alloy is placed between a first aluminum alloy and a second aluminum alloy, a first damping glue is set between the first aluminum alloy and the magnesium alloy, and a second damping glue is set between the second aluminum alloy and the magnesium alloy, and baking treatment, hot pressing composite treatment, and curing treatment are performed in sequence to obtain a metal composite plate.

[0047] In some specific embodiments, the flow chart of the method for preparing the metal composite plate 100 is as follows: Figure 2 As shown, including:

[0048] S101, placing a magnesium alloy between a first aluminum alloy and a second aluminum alloy, coating a first damping adhesive on a surface of the first aluminum alloy to be bonded with the magnesium alloy and performing a baking treatment, and coating a second damping adhesive on a surface of the second aluminum alloy to be bonded with the magnesium alloy and performing a baking treatment;

[0049] S102, hot-pressing the first aluminum alloy coated with the first damping adhesive, the magnesium alloy, and the second aluminum alloy coated with the second damping adhesive, and then performing a curing treatment to obtain a metal composite plate.

[0050] In some embodiments of the present application, the shapes of the magnesium alloy, the first aluminum alloy, the second aluminum alloy and the metal composite plate 100 include but are not limited to plates, strips, and foils, and the hot pressing composite method is rolling. In step S101, the magnesium alloy is placed between the first aluminum alloy and the second aluminum alloy, and specifically, the first aluminum alloy, the magnesium alloy and the second aluminum alloy are stacked in sequence in the thickness direction. The following takes this case as an example to explain in detail the preparation method of the metal composite plate 100, and the specific production line schematic diagram is as follows Figure 3 As shown. In step S101, the magnesium alloy 21 is placed between the first aluminum alloy 11 and the second aluminum alloy 31, and the first aluminum alloy 11, the magnesium alloy 21 and the second aluminum alloy 31 are respectively obtained by unwinding the first aluminum coil 1, the magnesium coil 2 and the second aluminum coil 3. After unwinding, the first aluminum alloy 11 is coated with the first damping glue by the first roller coating device 8, and the coated surface is the surface to be combined with the magnesium alloy 21. After coating, it is simultaneously conveyed to the first baking treatment device 5 for baking treatment with the magnesium alloy 21; at the same time, the second aluminum alloy 31 is coated with the second damping glue by the second roller coating device 9, and the coated surface is the surface to be combined with the magnesium alloy 21. After coating, it is conveyed to the second baking treatment device 6 for baking treatment.

[0051] In step S101, the first damping glue and / or the second damping glue include any one of nitrile rubber, butyl rubber and epoxy resin. In the implementation mode of the present application, the first damping glue and the second damping glue also include a solvent and a curing agent. In some specific embodiments, the solvent includes but is not limited to ethyl acetate; in the first damping glue and the second damping glue, the mass percentage of the solvent is 30%-70%. The present application can help the first damping glue and the second damping glue to fully dissolve each component by selecting a suitable solvent and controlling the content of the solvent within a suitable range, thereby improving the uniformity of the first damping glue and the second damping glue. In some specific implementation modes of the present application, the curing agent includes one or more of substituted urea, ethylenediamine, dicyandiamide and polyamide; in the first damping glue and the second damping glue, the mass percentage of the curing agent is 1%-10%. The present application can further improve the bonding force between the damping glue and the metal plate (aluminum alloy and magnesium alloy) by selecting a suitable curing agent and controlling the content of the curing agent within a suitable range.

[0052] In the implementation manner of the present application, the temperature of the baking treatment is 100°C-200°C, and the time of the baking treatment is 5min-10min. In some specific implementation manners, the temperature of the baking treatment can be, for example, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C; the time of the baking treatment can be, for example, 5min, 6min, 7min, 8min, 9min, 10min. The present application ensures that the solvent in the damping glue is removed as much as possible by controlling the temperature and time of the baking treatment within a suitable range.

[0053] In step S102, hot pressing and bonding is rolling. In some embodiments, rolling can be hot rolling. The first aluminum alloy 11 coated with the first damping glue, the magnesium alloy 21 and the second aluminum alloy 31 coated with the second damping glue are conveyed to the hot pressing and bonding device 10 in a stacked order for rolling and hot pressing and bonding. In some embodiments of the present application, the number of rolling rollers can be, for example, 3 pairs. The effect of rolling and hot pressing bonding can be further improved by controlling the number of rollers to 3 pairs. Controlling the number of rollers can better remove excess gas in the damping glue during the hot pressing and bonding process on the one hand; on the other hand, it can also better complete the infiltration and pre-curing of the damping glue on the metal plate (aluminum alloy and magnesium alloy), which is convenient for subsequent curing treatment.

[0054] In the embodiment of the present application, the rolling temperature is 200°C-300°C, the pressure is 2MPa-10 MPa, and the rolling speed is 2mm / min-10mm / min. In some specific embodiments, the rolling temperature can be, for example, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C; the rolling pressure can be, for example, 2MPa, 3MPa, 4MPa, 5MPa, 6MPa, 7MPa, 8MPa, 9MPa, 10MPa; the rolling speed can be, for example, 2mm / min, 3mm / min, 4mm / min, 5mm / min, 6mm / min, 7mm / min, 8mm / min, 9mm / min, 10mm / min. Hot pressing composite is a prerequisite for subsequent curing treatment. The present application can make the damping glue better infiltrate the aluminum alloy and magnesium alloy by controlling the relevant parameters of the hot pressing treatment within a suitable range, thereby further improving the bonding strength between the metal composite plate layers.

[0055] In the embodiment of the present application, after hot pressing and compounding, it also includes conveying to the curing treatment device 7 for curing treatment to obtain the metal composite plate 41, and the metal composite coil 4 is obtained after winding. In the embodiment of the present application, the temperature of the curing treatment is 150℃-200℃, and the time of the curing treatment is 2min-10min. In some specific embodiments, the temperature of the curing treatment can be, for example, 150℃, 160℃, 170℃, 180℃, 190℃, 200℃; the time of the curing treatment can be, for example, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, 10min. The curing treatment can solidify the damping glue to form a damping glue layer, thereby enhancing the bonding strength between the layers of the metal composite plate.

[0056] The preparation method of the metal composite plate provided in the present application has a simple process flow, does not require unnecessary surface treatment, reduces production costs, and has good bonding performance between layers of the prepared metal composite plate. The metal composite plate has a light overall weight, good vibration reduction effect, good corrosion resistance, and good forming and processing performance, which is convenient for subsequent processing as a raw material to obtain structural parts.

[0057] The present application also provides a structural part, which includes the metal composite plate provided above or the metal composite plate prepared by the preparation method provided above. In the implementation mode of the present application, the structural part includes but is not limited to an electric control box, a vehicle power box, a controller housing, a transmission assembly box, an electric drive housing and a battery pack tray.

[0058] The present application also provides a powertrain system, at least one component of which adopts the structural member provided in the foregoing text of the present application.

[0059] The present application also provides a vehicle, which includes the powertrain system provided above.

[0060] The effect of the technical solution of the present application is further illustrated below through specific examples.

[0061] Example 1

[0062] like Figure 3 As shown, the first aluminum coil No. 1 and the second aluminum coil No. 3 are unrolled, and the first roller coating device No. 8 and the second roller coating device No. 9 are roll-coated with nitrile rubber damping glue; the first baking treatment device No. 5 and the second baking treatment device No. 6 are respectively baked on the magnesium coil and the aluminum coil after rolling, and the baking temperature is 200°C and the baking time is 10 minutes; then the baked aluminum coil and magnesium coil are subjected to three-roll stacking hot pressing composite (the order from top to bottom is aluminum coil with damping glue layer, magnesium coil, aluminum coil with damping glue layer), the rolling temperature is 200°C, the rolling pressure is 5MPa, and the rolling speed is 5mm / min; finally, the metal plate after hot pressing composite is cured by the curing treatment device No. 7, the curing temperature is 150°C, the curing time is 10 minutes, and the metal composite plate is obtained after winding. In the metal composite plate prepared in this embodiment, the first aluminum alloy layer is 5052-O aluminum alloy with a thickness of 0.1 mm; the magnesium alloy layer is AZ31 magnesium alloy with a thickness of 1.4 mm; and the second aluminum alloy layer is 5052-O aluminum alloy with a thickness of 0.1 mm.

[0063] Example 2

[0064] The difference from Example 1 is that the thickness of the first aluminum alloy layer is 0.2 mm, the thickness of the magnesium alloy layer is 1.2 mm, and the thickness of the second aluminum alloy layer is 0.2 mm.

[0065] Example 3

[0066] The difference from Example 1 is that the thickness of the first aluminum alloy layer is 0.3 mm, the thickness of the magnesium alloy layer is 1.0 mm, and the thickness of the second aluminum alloy layer is 0.3 mm.

[0067] Example 4

[0068] The difference from Example 1 is that the thickness of the first aluminum alloy layer is 0.4 mm, the thickness of the magnesium alloy layer is 0.8 mm, and the thickness of the second aluminum alloy layer is 0.4 mm.

[0069] Example 5

[0070] The difference from Example 1 is that the thickness of the first aluminum alloy layer is 0.5 mm, the thickness of the magnesium alloy layer is 0.6 mm, and the thickness of the second aluminum alloy layer is 0.5 mm.

[0071] Comparative Example 1

[0072] The difference from Example 1 is that in the metal composite plate prepared in this comparative example, the first aluminum alloy layer is replaced by an AZ31 magnesium alloy with a thickness of 0.1 mm, and the second aluminum alloy layer is replaced by an AZ31 magnesium alloy with a thickness of 0.1 mm.

[0073] Comparative Example 2

[0074] The difference from Example 1 is that in the metal composite plate prepared in this comparative example, the magnesium alloy layer is replaced by a 5052-O aluminum alloy with a thickness of 1.4 mm.

[0075] Comparative Example 3

[0076] The difference from Example 1 is that the metal composite plate prepared in this comparative example does not have a second aluminum alloy layer.

[0077] Performance Testing

[0078] Performance tests were performed on Examples 1 to 5 and Comparative Examples 1 to 3, and the results are shown in Table 1.

[0079] Damping coefficient: The cantilever beam method is adopted, the test equipment is a vibration damping characteristic test analyzer, and the test standard is ASTME756-05 (standard test method for measuring vibration damping characteristics of materials).

[0080] Limit drawing ratio at room temperature: The test method adopts the drawing and drawing load test part of Part 3 in GB / T 15825.3-2008 (Forming properties and test methods of metal sheets).

[0081] Corrosion resistance: The test method adopts the 5.2 neutral salt spray test (NSS test) section of GB / T 10125-2012 (artificial atmosphere corrosion test smoke test).

[0082] Table 1

[0083]

[0084] As can be seen from Table 1, compared with the metal composite plates of Comparative Examples 1 to 3, the metal composite plates of Examples 1 to 5 of the present application adopt a laminated structure of aluminum alloy-magnesium alloy-aluminum alloy, and a suitable damping glue is selected between the aluminum alloy and the magnesium alloy for compounding, so that the metal composite plates have a higher damping coefficient, that is, good shock absorption, and also have a higher limit drawing ratio at room temperature, that is, good metal processability. In addition, compared with the pure aluminum alloy of Comparative Example 2, it can also have a significant weight reduction effect, meeting the demand for lightweight.

[0085] The above is a preferred embodiment of the present application, but it should not be understood as limiting the scope of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A metal composite plate, characterized in that: The metal composite plate includes a first aluminum alloy layer, a first damping rubber layer, a magnesium alloy layer, a second damping rubber layer and a second aluminum alloy layer stacked in sequence; the material of the first damping rubber layer and the second damping rubber layer is independently selected from any one of nitrile rubber, butyl rubber and epoxy resin.

2. The metal composite plate according to claim 1, characterized in that: The thickness of the first damping adhesive layer is 10 μm-30 μm; and / or the thickness of the second damping adhesive layer is 10 μm-30 μm.

3. The metal composite plate according to claim 1 or 2, characterized in that: The first damping adhesive layer and the second damping adhesive layer are made of the same material.

4. The metal composite plate according to any one of claims 1 to 3, characterized in that: The thickness ratio of the first aluminum alloy layer to the magnesium alloy layer is 1:(2-6); and / or the thickness ratio of the second aluminum alloy layer to the magnesium alloy layer is 1:(2-6).

5. The metal composite plate according to any one of claims 1 to 4, characterized in that: The thickness of the first aluminum alloy layer and / or the second aluminum alloy layer is 0.2 mm-0.4 mm; the total thickness of the metal composite plate is 1.4 mm-2.0 mm.

6. The metal composite plate according to any one of claims 1 to 5, characterized in that: The damping coefficient of the metal composite plate is greater than or equal to 0.3; the room temperature limit drawing ratio of the metal composite plate is greater than or equal to 1.

6.

7. A method for preparing a metal composite plate according to any one of claims 1 to 6, characterized in that: include: A magnesium alloy is placed between a first aluminum alloy and a second aluminum alloy, a first damping glue is set between the first aluminum alloy and the magnesium alloy, and a second damping glue is set between the second aluminum alloy and the magnesium alloy, and baking treatment, hot pressing composite treatment, and curing treatment are performed in sequence to obtain a metal composite plate.

8. The method for preparing the metal composite plate according to claim 7, characterized in that: The baking treatment temperature is 100° C.-200° C., and the baking treatment time is 5 min-10 min.

9. The method for preparing a metal composite plate according to claim 7 or 8, characterized in that: The hot pressing composite is rolling, the rolling temperature is 200° C.-300° C., the rolling pressure is 2 MPa-10 MPa, and the rolling speed is 2 mm / min-10 mm / min.

10. The method for preparing a metal composite plate according to any one of claims 7 to 9, characterized in that: The temperature of the curing treatment is 150° C.-200° C., and the time of the curing treatment is 2 min-10 min.

11. A structural member, characterized in that: The structural member comprises the metal composite plate according to any one of claims 1 to 6 or the metal composite plate prepared by the preparation method according to any one of claims 7 to 10.

12. A powertrain system, characterized in that: The powertrain system comprises the structural component according to claim 11.

13. A vehicle, characterized in that: The vehicle includes the powertrain system of claim 12.

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