A hot bending and cold straightening device and method for metal layered composite plates

Abstract

This invention discloses a hot bending and cold straightening device and method for metal layered composite plates, belonging to the technical field of metal layered composite plates. The device includes straightening rollers, a driving device, and a pressing device. The straightening rollers consist of at least one set of straightening concave rollers and straightening convex rollers with specific curvatures. The driving device is used to adjust the straightening speed of the straightening rollers, and the pressing device is used to adjust the roller gap spacing. The metal layered composite plate at a certain temperature is bent and deformed by the hot bending and cold straightening device, and a straight metal layered composite plate is obtained during the subsequent cooling process. The hot bending and cold straightening device for metal layered composite plates has a simple structure, high straightening efficiency, and low deformation resistance. The metal layered composite plate straightened using this method has good surface quality, and the impact on the interface bonding quality of the metal layered composite plate during the straightening process is minimal. It is particularly suitable for online straightening of hot-formed metal layered composite plates.

Description

Technical Field

[0001] This invention belongs to the technical field of metal layered composite plates, specifically relating to a hot bending and cold straightening device and method for metal layered composite plates, which is particularly suitable for online straightening of hot-formed metal layered composite plates. Background Technology

[0002] Metal layered composite plates are composed of two or more heterogeneous metal materials, combining the excellent properties of each component. They are widely used in aerospace, transportation, petrochemicals, information and communication, defense, and everyday life. Due to the different coefficients of thermal expansion of the heterogeneous metal materials in the composite plate, the straight composite plate obtained after hot working is prone to bending deformation during subsequent cooling. The higher the processing temperature or the greater the difference in the coefficients of thermal expansion of the heterogeneous metal materials, the greater the bending deformation of the composite plate, severely affecting its subsequent processing and application. Therefore, straightening of the bent composite plate is usually required before further processing and application.

[0003] Currently, metal laminated composite plates are mainly straightened using pressure straighteners, tension straighteners, or roller straighteners. When using a pressure straightener, the bent portion of the metal laminated composite plate is placed between a movable pressure head and two fixed supports, and straightening is achieved through a single-bending, strong elastic-plastic deformation method. This method is cumbersome to operate, difficult to control the amount of bending, and suffers from low straightening efficiency, poor post-straightening surface quality, and difficulties in large-scale processing. When using a tension straightener, tension exceeding the material's yield strength is applied to both ends of the metal laminated composite plate, causing elastic-plastic deformation and thus straightening the plate. This method requires applying significant tension to the metal laminated composite plate, and the dimensions of the metal laminated composite plate... Limited by limitations, straightening methods suffer from problems such as low straightening efficiency, inconsistent deformation, permanent deformation of metal layered composite plates, poor dimensional accuracy, easy generation of scrap from the clamps, and difficulty in large-volume, large-size processing. When using a roller straightener, the metal layered composite plate is straightened by passing it through two rows of staggered straightening rollers, utilizing repeated bending and elasto-plastic deformation. Generally, the thinner the metal layered composite plate, the more straightening rollers are required. This results in problems such as high equipment requirements, large reverse bending straightening force, easy formation of straightening marks on the surface, and repeated bending deformation having a significant impact on the composite interface quality of the metal layered composite plate.

[0004] As shown above, traditional straightening techniques for metal layered composite panels typically involve applying reverse bending or stretching to the bent portions of the panel offline, causing elastic-plastic deformation. Once the external force is removed, the panel elastically recovers and reaches a straight state. However, this straightening process requires significant deformation force, and the uncoordinated deformation between the individual metal layers can easily damage the interfacial bonding quality. This is especially true during repeated bending deformation in multi-roller straightening, which can easily lead to interface cracking and render the metal layered composite panel unusable. Therefore, there is an urgent need to develop new equipment and methods for straightening metal layered composite panels to achieve high-quality, high-efficiency, low-cost, and continuous straightening, particularly enabling online straightening immediately after hot forming. The development of such straightening equipment and methods will accelerate the widespread application of metal layered composite panels and is of great significance. Summary of the Invention

[0005] To address the problem of deformation occurring during the preparation or cooling of metal layered composite panels, which prevents subsequent processing or direct application, this invention aims to provide a hot bending and cold straightening device and method for metal layered composite panels. The device subjectes the metal layered composite panel, at a certain temperature, to elasto-plastic deformation through bending. The deformed panel naturally straightens during subsequent cooling. Compared to traditional pressure straighteners, tension straighteners, or roller straighteners, this hot bending and cold straightening device offers advantages such as simple structure, high straightening efficiency, and low deformation resistance. The resulting metal layered composite panel exhibits good surface quality, and the straightening process has minimal impact on the interfacial bonding quality, making it particularly suitable for online straightening of hot-formed metal layered composite panels.

[0006] According to a first aspect of the technical solution of the present invention, a hot bending and cold straightening device for metal layered composite plates is provided, comprising straightening rollers, a driving device, a pressing device, a frame and a transmission shaft;

[0007] The straightening roller comprises at least one set of straightening concave rollers and straightening convex rollers with specific curvatures. The straightening concave rollers and the straightening convex rollers are installed in the middle of the frame and are connected to the drive shaft.

[0008] The drive device is installed on the side of the straightening roller and connected to the transmission shaft, and is used to drive the straightening roller and adjust the straightening speed of the straightening roller.

[0009] The pressing device is installed on the upper end of the frame and is used to adjust the gap between the straightening rollers.

[0010] Furthermore, the straightening roller may be composed of multiple sets of straightening concave rollers and straightening convex rollers. Each set of straightening concave rollers and straightening convex rollers is symmetrically distributed vertically and corresponds one-to-one. Multiple sets of straightening concave rollers are arranged horizontally on the same side, and multiple sets of straightening convex rollers are arranged horizontally on the other side.

[0011] Furthermore, based on the coefficients of thermal expansion of each component metal material in the metal layered composite plate, the component metal material layer with a large coefficient of thermal expansion is classified as the base layer, and the component metal material layer with a small coefficient of thermal expansion is classified as the cladding layer; the coefficient of thermal expansion of the base layer is α1, and the coefficient of thermal expansion of the cladding layer is α2, where α1 is greater than α2; the total thickness of the metal layered composite plate is H.

[0012] Furthermore, the straightening temperature of the metal layered composite plate is T, the application environment temperature is T0, and the difference between the straightening temperature and the application environment temperature is represented by ΔT, resulting in ΔT = T - T0; the yield strength of the metal layered composite plate at the straightening temperature T is σ. s The elastic modulus is E.

[0013] Furthermore, the roller profile of the straightening roller is represented by the curvature K, where K = 2 × (α1 - α2) × ΔT / H + 4 × σ s / (E×H); The curvature is a description of the geometry of the straightening roller. By setting the curvature according to the physical property parameters of the metal layered composite material, the metal layered composite material can be bent and deformed precisely, thereby ensuring that a flat and high-quality metal layered composite material is obtained in the subsequent cooling process.

[0014] Furthermore, the gap between the rollers of the straightening roller is H.

[0015] Furthermore, the curvature of the straightening roller and the roller gap spacing of the straightening roller can be adjusted according to the actual situation of the metal layered composite plate.

[0016] Furthermore, the straightening concave roller and the straightening convex roller are axially symmetrical, and their installation positions are interchangeable.

[0017] Furthermore, the hot bending and cold straightening equipment for the metal layered composite plate can be used in conjunction with at least one of the following straightening equipment: pressure straightening machine, tension straightening machine, or roller straightening machine.

[0018] Furthermore, the straightening equipment can be used as a rolling equipment to simultaneously perform rolling plastic deformation and straightening processes.

[0019] According to a second aspect of the present invention, a method for hot bending and cold straightening of a metal layered composite plate is provided. The method employs a metal layered composite plate hot bending and cold straightening device according to any of the above aspects to complete the straightening process. The specific steps are as follows:

[0020] Step 1: Based on the actual application of the metal layered composite panel, determine the application environment temperature T0 and the straightening temperature T, and calculate the difference between them ΔT = T - T0; determine the physical performance parameters of the metal layered composite panel, including the thermal expansion coefficient α1 of the base layer, the thermal expansion coefficient α2 of the coating layer, and the total thickness H; determine the yield strength σ of the metal layered composite panel at the straightening temperature T. s Elastic modulus E;

[0021] Step 2: Calculate the curvature K of the straightening roller: K = 2 × (α1 - α2) × ΔT / H + 4 × σ s / (E×H);

[0022] Step 3: Process the straightening roller with the curvature K;

[0023] Step 4: Install the straightening roller and adjust the roller gap to H using the pressing device;

[0024] Step 5: Start the drive device and adjust the straightening speed;

[0025] Step 6: The metal layered composite plate at temperature T is subjected to hot bending deformation through the straightening roller with curvature K. During the deformation process, the cladding layer faces the straightening convex roller, and the base layer faces the straightening concave roller.

[0026] Step 7: Cool the hot-bent and deformed metal layered composite plate to the application environment temperature to obtain a flat metal layered composite plate.

[0027] The main advantages of this invention are:

[0028] (1) The straightening equipment of the present invention has a simple structure, high straightening efficiency, low deformation resistance, and good surface quality of the straightened metal layered composite plate. Usually, only one set of straightening rollers is needed to complete the online continuous batch industrial hot straightening process of the metal layered composite plate, which significantly reduces the adverse effects of repeated bending deformation on the surface quality and composite interface bonding quality of the metal layered composite plate during the traditional multi-roller straightening process.

[0029] (2) The straightening equipment of the present invention combines straightening technology with rolling technology to achieve the purpose of rolling and straightening in one pass, and is particularly suitable for the integrated synchronous rolling and straightening processing of hot-rolled plastic deformation metal layered composite plates.

[0030] (3) The straightening method of the present invention combines hot deformation processing with straightening, and can directly perform hot bending and cold straightening using the residual heat after hot deformation processing. There is no need to reheat the metal layered composite plate before straightening, which improves production efficiency and reduces energy consumption.

[0031] (4) The straightening method of the present invention can straighten to different degrees according to the different application environment temperatures of the metal layered composite plate, so as to obtain a flat and high-quality metal layered composite plate that meets the application environment temperature. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a hot bending and cold straightening equipment for metal layered composite panels. In the diagram, 1-straightening concave roller, 2-straightening convex roller, 3-drive device, 4-pressing device, 5-frame, and 6-drive shaft.

[0034] Figure 2 This is a schematic diagram of the hot bending and cold straightening process for metal layered composite panels.

[0035] Figure 3 This is a photograph showing the change in curvature of a pure titanium / Q235 steel layered composite plate with temperature during the cooling process after hot bending deformation. Detailed Implementation

[0036] The present invention will be described in detail below with reference to the embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make non-essential improvements and adjustments based on the content of the present invention.

[0037] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The technical solution of this invention first provides a hot bending and cold straightening device for metal layered composite plates, such as... Figure 1As shown, the machine consists of a straightening roller, a drive device 3, a pressing device 4, a frame 5, and a transmission shaft 6. The straightening roller is composed of a set of straightening concave rollers 1 and straightening convex rollers 2 with specific curvatures. The straightening concave rollers 1 and straightening convex rollers 2 are symmetrically distributed vertically in the middle of the frame and connected to the transmission shaft. The drive device 3 is installed on the side of the straightening roller and connected to the transmission shaft, and is used to drive the straightening roller and adjust the straightening speed of the straightening roller. The pressing device 4 is installed on both sides of the upper end of the frame and is used to adjust the roller gap of the straightening roller.

[0039] Furthermore, the straightening roller may be composed of multiple sets of straightening concave rollers and straightening convex rollers. Each set of straightening concave rollers and straightening convex rollers is symmetrically distributed vertically and corresponds one-to-one. Multiple sets of straightening concave rollers are arranged horizontally on the same side, and multiple sets of straightening convex rollers are arranged horizontally on the other side.

[0040] Furthermore, based on the coefficients of thermal expansion of each component metal material in the metal layered composite plate, the component metal material layer with a large coefficient of thermal expansion is classified as the base layer, and the component metal material layer with a small coefficient of thermal expansion is classified as the cladding layer; the coefficient of thermal expansion of the base layer is α1, and the coefficient of thermal expansion of the cladding layer is α2, where α1 is greater than α2; the total thickness of the metal layered composite plate is H.

[0041] Furthermore, the straightening temperature of the metal layered composite plate is T, the application environment temperature is T0, and the difference between the straightening temperature and the application environment temperature is represented by ΔT, resulting in ΔT = T - T0; the yield strength of the metal layered composite plate at the straightening temperature T is σ. s The elastic modulus is E.

[0042] Furthermore, the roller profile of the straightening roller is represented by the curvature K, where curvature K = 2 × (α1 - α2) × ΔT / H + 4 × σ s / (E×H); The gap between the rollers of the straightening roller is H.

[0043] Furthermore, the curvature of the straightening roller and the roller gap spacing of the straightening roller can be adjusted according to the actual situation of the metal layered composite plate.

[0044] Furthermore, the straightening concave roller and the straightening convex roller are axially symmetrical, and their installation positions are interchangeable.

[0045] Furthermore, the hot bending and cold straightening equipment for the metal layered composite plate can be used in conjunction with at least one of the following straightening equipment: pressure straightening machine, tension straightening machine, or roller straightening machine.

[0046] Furthermore, the straightening equipment can be used as a rolling equipment to simultaneously perform rolling plastic deformation and straightening processes.

[0047] The present invention provides a method for hot bending and cold straightening of metal layered composite panels. This method utilizes the aforementioned hot bending and cold straightening equipment for metal layered composite panels to complete the straightening process. The specific steps are as follows:

[0048] Step 1: Based on the actual application of the metal layered composite panel, determine the application environment temperature T0 and the straightening temperature T, and calculate the difference between them ΔT = T - T0; determine the physical performance parameters of the metal layered composite panel, including the thermal expansion coefficient α1 of the base layer, the thermal expansion coefficient α2 of the coating layer, and the total thickness H; determine the yield strength σ of the metal layered composite panel at the straightening temperature T. s Elastic modulus E;

[0049] Step 2: Calculate the curvature K of the straightening roller: K = 2 × (α1 - α2) × ΔT / H + 4 × σ s / (E×H);

[0050] Step 3: Process the straightening roller with the curvature K;

[0051] Step 4: Install the straightening roller and adjust the roller gap to H using the pressing device;

[0052] Step 5: Start the drive device and adjust the straightening speed;

[0053] Step 6: According to... Figure 2 The hot bending and cold straightening process of the metal layered composite plate shown involves hot bending the metal layered composite plate at a temperature of T through the straightening roller with a curvature of K. During the deformation process, the cladding layer faces the straightening convex roller, and the base layer faces the straightening concave roller. Subsequently, the hot-bent metal layered composite plate is cooled to the application environment temperature to obtain a flat metal layered composite plate.

[0054] Example 1:

[0055] The hot bending and cold straightening processes for pure titanium / Q235 steel layered composite plates are as follows:

[0056] Step 1: Based on the actual application of the pure titanium / Q235 steel layered composite plate, the application environment temperature is determined to be room temperature (25℃), and the straightening temperature is determined to be 650℃; the total thickness of the pure titanium / Q235 steel layered composite plate is determined to be 0.002 μm, and the coefficient of thermal expansion of Q235 steel is determined to be 12 × 10⁻⁶. -6 ℃ -1 The coefficient of thermal expansion of pure titanium is 9×10⁻⁶. -6℃ -1 The yield strength of the pure titanium / Q235 steel layered composite plate at 650℃ was determined to be 110MPa and the elastic modulus to be 120000MPa.

[0057] Step 2: The curvature of the straightening roller is calculated to be 3.7m. -1 ;

[0058] Step 3: Process to achieve a curvature of 3.7m -1 Straightening rollers;

[0059] Step 4: Install the straightening rollers and adjust the roller gap to 0.002m using the pressing device;

[0060] Step 5: Start the drive unit and adjust the straightening speed to 1 m / s;

[0061] Step 6: Pass the pure titanium / Q235 steel layered composite plate, heated to 650℃, through a curvature of 3.7m. -1 The straightening rolls are subjected to hot bending deformation, with the pure titanium side facing the convex roll and the Q235 steel side facing the concave roll during the deformation process.

[0062] Step 7: Cool the hot-bent pure titanium / Q235 steel layered composite plate to room temperature using air cooling. A physical image showing the change in curvature of the pure titanium / Q235 steel layered composite plate with temperature during the cooling process is shown below. Figure 3 As shown, the pure titanium / Q235 steel layered composite plate bent at high temperature gradually reaches a straight state during the cooling process, and finally a straight pure titanium / Q235 steel layered composite plate is obtained.

[0063] Example 2:

[0064] The hot bending and cold straightening processes for pure titanium / pure aluminum layered composite plates are as follows:

[0065] Step 1: Based on the actual application of the pure titanium / pure aluminum layered composite plate, the application environment temperature is determined to be room temperature (25℃) and the straightening temperature to be 400℃; the total thickness of the pure titanium / pure aluminum layered composite plate is determined to be 0.003 μm, and the coefficient of thermal expansion of pure aluminum is 24 × 10⁻⁶. -6 ℃ -1 The coefficient of thermal expansion of pure titanium is 9×10⁻⁶. -6 ℃ -1 The yield strength of the pure titanium / pure aluminum layered composite plate at 400℃ was determined to be 85MPa and the elastic modulus to be 64000MPa.

[0066] Step 2: The curvature of the straightening roller is calculated to be 5.5m. -1 ;

[0067] Step 3: Process to achieve a curvature of 5.5m -1 Straightening rollers;

[0068] Step 4: Install the straightening rollers and adjust the roller gap to 0.003m using the pressing device;

[0069] Step 5: Start the drive unit and adjust the straightening speed to 0.5 m / s;

[0070] Step 6: Pass the pure titanium / pure aluminum layered composite plate at 400℃ through a curvature of 5.5m. -1 The straightening rollers are subjected to hot bending deformation, with the pure titanium side facing the convex roller and the pure aluminum side facing the concave roller during the deformation process;

[0071] Step 7: Cool the hot-bent and deformed pure titanium / pure aluminum layered composite plate to room temperature with water to obtain a flat pure titanium / pure aluminum layered composite plate.

[0072] Example 3:

[0073] The specific steps for hot bending and cold straightening of AZ31 magnesium alloy / Q235 steel layered composite plates are as follows:

[0074] Step 1: Based on the actual application of the AZ31 magnesium alloy / Q235 steel layered composite plate, the application environment temperature is determined to be room temperature (25℃) and the straightening temperature to be 400℃; the total thickness of the AZ31 magnesium alloy / Q235 steel layered composite plate is determined to be 0.005 μm, and the coefficient of thermal expansion of AZ31 magnesium alloy is 27 × 10⁻⁶. -6 ℃ -1 The coefficient of thermal expansion of Q235 steel is 12×10⁻⁶. -6 ℃ -1 The yield strength of the AZ31 magnesium alloy / Q235 steel layered composite plate at 400℃ was determined to be 90MPa and the elastic modulus to be 100000MPa.

[0075] Step 2: The curvature of the straightening roller is calculated to be 3.0m. -1 ;

[0076] Step 3: Process to achieve a curvature of 3.0m -1 Straightening rollers;

[0077] Step 4: Install the straightening rollers and adjust the roller gap to 0.005m using the pressing device;

[0078] Step 5: Start the drive unit and adjust the straightening speed to 0.8 m / s;

[0079] Step 6: Pass the AZ31 magnesium alloy / Q235 steel layered composite plate, heated to 400℃, through a curvature of 3.0m. -1 The straightening rolls are subjected to hot bending deformation. During the deformation process, the Q235 steel side faces the convex roll, and the AZ31 magnesium alloy side faces the concave roll.

[0080] Step 7: Cool the hot-bent AZ31 magnesium alloy / Q235 steel layered composite plate to room temperature using air cooling to obtain a flat AZ31 magnesium alloy / Q235 steel layered composite plate.

[0081] Comparative Example 1:

[0082] A multi-roller straightener was used to straighten pure titanium / Q235 steel layered composite plates. The straightening temperature was room temperature (25℃). Room temperature straightening resulted in higher deformation resistance, requiring higher coercivity from the equipment. During multi-roller straightening, repeated bending deformation was necessary. The thinner the pure titanium / Q235 steel layered composite plate, the more straightening rollers and the more repeated bending deformation passes were required. Due to the uncoordinated deformation of the heterogeneous metal components in the pure titanium / Q235 steel layered composite plate, the bonding quality of the composite interface was damaged during deformation, which could lead to cracking of the composite interface in severe cases. When the degree of bending deformation of the pure titanium / Q235 steel layered composite plate to be straightened was large, especially when the deformation amplitude was much higher than the roller gap, it was difficult to feed it into the multi-roller straightener for straightening.

[0083] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A hot bending and cold straightening device for metal layered composite plates, characterized in that, It includes straightening rollers, drive unit, pressing device, frame, and drive shaft; The straightening roller includes at least one set of straightening concave rollers and straightening convex rollers with a specific curvature K. The straightening concave rollers and the straightening convex rollers are installed in the middle of the frame, and the straightening concave rollers and the straightening convex rollers are connected to the drive shaft. The drive device is installed on the side of the straightening roller and connected to the transmission shaft, and is used to drive the straightening roller and adjust the straightening speed of the straightening roller. The pressing device is installed on the upper end of the frame and is used to adjust the gap between the straightening rollers; In the metal layered composite plate, the component metal material layer with a large coefficient of thermal expansion is the base layer, and the component metal material layer with a small coefficient of thermal expansion is the cladding layer; the coefficient of thermal expansion of the base layer is α1, and the coefficient of thermal expansion of the cladding layer is α2, where α1 is greater than α2; the total thickness of the metal layered composite plate is H. The straightening temperature of the metal layered composite plate is T, and the application environment temperature is T0. The difference between the straightening temperature and the application environment temperature is represented by... express, The yield strength of the metal layered composite plate at the straightening temperature T is: The elastic modulus is E; The shape of the straightening roller's curve is represented by the curvature K. The gap between the rollers of the straightening roller is the total thickness of the metal layered composite plate.

2. The hot bending and cold straightening equipment for metal layered composite plates as described in claim 1, characterized in that, Adjust the curvature of the straightening roller and the roller gap spacing according to the actual situation of the metal layered composite plate.

3. The hot bending and cold straightening equipment for metal layered composite plates as described in claim 1, characterized in that, The straightening roller is composed of multiple sets of straightening concave rollers and straightening convex rollers. Each set of straightening concave rollers and straightening convex rollers is symmetrically distributed vertically and corresponds one-to-one. Multiple sets of straightening concave rollers are arranged horizontally on the same side, and multiple sets of straightening convex rollers are arranged horizontally on the other side.

4. The hot bending and cold straightening equipment for metal layered composite plates as described in claim 1, characterized in that, The straightening concave roller and the straightening convex roller are axially symmetrical, and their installation positions can be interchanged.

5. The hot bending and cold straightening equipment for metal layered composite plates as described in claim 1, characterized in that, The hot bending and cold straightening equipment for metal layered composite plates is used in conjunction with at least one of the following straightening equipment: pressure straightening machine, tension straightening machine, or roller straightening machine.

6. The hot bending and cold straightening equipment for metal layered composite plates as described in claim 1, characterized in that, The straightening equipment is used as a rolling equipment to perform both rolling plastic deformation and straightening processes.

7. A method for hot bending and cold straightening of a metal layered composite plate, characterized in that, The hot bending and cold straightening method for the metal layered composite plate is completed using the hot bending and cold straightening equipment for the metal layered composite plate according to any one of claims 1 to 6. The specific steps are as follows: Step 1: Determine the application environment temperature T0 and the straightening temperature T, and calculate the difference between them. Determine the physical performance parameters of the metal layered composite plate, including the thermal expansion coefficient α1 of the base layer, the thermal expansion coefficient α2 of the cladding layer, and the total thickness H; determine the yield strength σ of the metal layered composite plate at the straightening temperature T. s Elastic modulus E; Step 2: Calculate the curvature of the straightening roller, curvature ; Step 3: Process the straightening roller with the curvature K; Step 4: Install the straightening rollers and adjust the roller gap to the total thickness of the metal layered composite plate using the pressing device; Step 5: Start the drive device and adjust the straightening speed; Step 6: The metal layered composite plate is hot-bent and deformed by the straightening roller with curvature K. During the deformation process, the cladding layer faces the straightening convex roller, and the base layer faces the straightening concave roller. Step 7: Cool the hot-bent and deformed metal layered composite plate to the application environment temperature to obtain a flat metal layered composite plate.

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