Method and system for optimizing properties of a composite sheet based on a roll-bending-ultrasonic flattening process cycle

Abstract

The application relates to a composite plate performance optimization method based on a roller bending-ultrasonic flattening process cycle, S1, selecting a composite plate blank with a corresponding thickness; S2, placing the composite plate blank into a heating furnace and heating; S3, repeatedly roller bending the heated composite plate blank to be rolled into a circular arc shape with a certain angle; S4, inverting and turning over the repeatedly roller-bent composite plate blank on a mold for ultrasonic flattening; S5, turning over the composite plate blank, reheating the composite plate blank after turning over, and then performing reverse roller bending and reverse ultrasonic flattening; S6, setting the heating composite plate-roller bending-ultrasonic flattening-turning over the composite plate blank-reheating-reverse roller bending-reverse ultrasonic flattening of steps S2-S5 as one cycle, and then recycling steps S2-S5 multiple times to obtain the composite plate blank. The application can eliminate residual stress, break grains and improve microstructure through repeated severe plastic deformation and physical ultrasonic vibration, so as to improve the performance of the plate blank.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic forming and material modification, in particular to a composite plate performance optimization method and system based on a roll-bending-ultrasonic flattening process cycle. BACKGROUND

[0002] In recent years, natural resources are scarce, and due to the poor comprehensive performance of single metal materials and alloy materials, their application fields have been greatly limited. The development, production and application of metal composite materials have been paid more and more attention by the country. With the development of science and technology, new processes and new technologies are constantly updated and iterated, and the development and application of metal composite plates have been greatly expanded, and the types of composite plate materials are more abundant and the application fields are continuously extended.

[0003] Due to the performance functionalization of metal composite materials, the selection of composite plates can maximize the performance of each alloy for special service environments. However, when the composite plate is prepared into a blank, due to various factors, serious anisotropy, coarse grains, uneven structure and incomplete release of residual stress may occur, so it is necessary to optimize the mechanical and forming properties of the composite plate in the subsequent part processing process.

[0004] There are many methods to improve the performance of the plate blank, such as: in order to improve the anisotropy of aluminum alloy plate for automobile body, an institution discloses a method for improving the anisotropy of aluminum alloy plate for automobile body, through a series of steps such as hot rolling, annealing, cross roll bending and solid solution treatment, the overall performance of the aluminum alloy plate is improved; in order to improve the performance of Al-Mg-Li alloy plate, an institution discloses a method for improving the performance of Al-Mg-Li alloy plate, adopts a multi-pass roll bending with intermediate annealing process, and after intermediate annealing, changes warm rolling to cold rolling, this method improves the deformation energy storage of the alloy, and solves the problem of low superplasticity of the plate; in order to improve the surface performance of light alloy, an institution discloses a modification device and method integrating friction stir and ultrasonic rolling, which is used for surface modification of magnesium alloy and other light alloys, significantly improves the microstructure of the alloy, greatly improves the mechanical properties and ductility, improves the plastic processing capacity, improves the corrosion resistance, greatly reduces the surface roughness, and improves the comprehensive performance index of the surface. The above methods all have their own shortcomings, or the steps are complicated, or multiple heat treatment aids are needed, or the equipment is complex, etc. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, solve the problems of anisotropy, coarse grains, uneven structure and incomplete release of residual stress in the composite plate blank, the present application inputs energy through physical ultrasonic vibration, can eliminate more residual stress, break the grains and improve the microstructure, so as to improve the performance of the blank; through the alternating action of multi-pass bending and ultrasonic flattening cycle, the residual stress of the composite plate blank can be significantly reduced, and the performance of the plate can be improved.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following solution: a composite plate performance optimization method based on a bending-ultrasonic flattening process cycle is provided, which comprises the following steps:

[0007] Specifically, the present application provides a composite plate performance optimization method based on a bending-ultrasonic flattening process cycle, which comprises the following steps:

[0008] S1, according to the set thickness and alloy material, selecting the alloy composite plate blank with the corresponding thickness;

[0009] S2, placing the composite plate blank into a heating furnace for heating;

[0010] S3, repeatedly bending the heated composite plate blank, and rolling into a circular arc shape with a certain angle:

[0011] Using a plate rolling machine to repeatedly bend the composite plate blank, so as to uniformly refine the grains of the composite plate;

[0012] S4, inverting and turning the repeatedly bent composite plate blank on the mold for ultrasonic flattening:

[0013] The ultrasonic vibration applies periodic dynamic stress to the composite plate blank, the dynamic stress and the internal residual stress of the composite plate blank are superimposed, a small plastic deformation is generated, and the release of the residual stress is completed;

[0014] S5, turning over the composite plate blank, reheating the composite plate blank after turning over, then using the plate rolling machine to roll reversely into a circular arc shape with the same preset angle, and then performing ultrasonic flattening;

[0015] S6, setting the heating composite plate-rolling-ultrasonic flattening-turning over the composite plate blank-reheating-reverse rolling-reverse ultrasonic flattening of steps S2-S5 as one cycle, then repeating steps S2-S5 multiple times to obtain the composite plate blank.

[0016] Preferably, the number of recirculations in step S6 is twice.

[0017] Preferably, in step S2, the heating furnace is used for heating, and the composite plate blank is heated to 150-200 DEG C in the heating furnace.

[0018] Preferably, the step S3 uses the roll bender to roll the heated composite plate blank in multiple passes.

[0019] The step S3 uses the roll bender to roll the heated composite plate blank in multiple passes.

[0020] S31, place the first end of the heated composite plate blank on the surface of the two lower rollers, so that the first end of the composite plate blank exceeds the lower roller on one side of the composite plate advancing direction by a certain distance.

[0021] S32, adjust the position of the composite plate blank so that the side edge of the composite plate blank is perpendicular to the generatrix of the lower roller; adjust the position of the upper roller to be in contact with the upper surface of the composite plate blank, and lower the upper roller by a certain distance with the initial reduction amount to make the composite plate blank bend and deform; rotate the lower roller to make the plate move by the friction between the roller and the composite plate, and the whole bending deformation occurs.

[0022] S33, gradually increase the reduction amount of the upper roller to make the lower roller rotate in the opposite direction, and repeatedly roll the heated composite plate blank multiple times to roll it into a circular arc shape with a preset angle.

[0023] Preferably, the step S3 of rolling into a circular arc shape with a preset angle refers to rolling the composite plate blank into a circular arc shape with an angle of 150°-160°.

[0024] Preferably, the step S4 of performing ultrasonic flattening is to set the power of the ultrasonic generator to 0-3KW, the frequency to 20KHz, and the amplitude to 30-50μm.

[0025] Preferably, in step S1, a stainless steel aluminum alloy rolled composite plate initial plate with a thickness of 2-6mm and a layer thickness ratio of 2:1 is prepared and selected, and then cut into a plate sample with a size of 600mm×300mm.

[0026] Preferably, in another aspect, the present application also provides a composite plate performance optimization system based on the roll bending-ultrasonic flattening process cycle, which comprises a heating assembly, a roll bending assembly and an ultrasonic flattening assembly, the heating assembly comprises a heating furnace, the roll bending assembly comprises a plurality of bending rollers arranged side by side, and the ultrasonic flattening assembly comprises an upper anvil, a lower anvil, a transducer, an amplitude transformer and an ultrasonic generator.

[0027] The output end of the ultrasonic generator is connected to the input end of the transducer, the output end of the transducer is connected to the first end of the amplitude transformer, the second end of the amplitude transformer is connected to the lower anvil, the lower anvil is fixed on the workbench, and the upper anvil is installed on the upper slide block of the hydraulic machine.

[0028] Preferably, the two ends of the amplitude transformer are connected to the lower anvil and the transducer by means of stud bolts.

[0029] Compared with the prior art, the present application has the beneficial effects that:

[0030] (1) The present application can eliminate most of the residual stress of the composite slab, break the grains, and improve the microstructure by inputting energy in the form of physical ultrasonic vibration, so as to improve the performance of the slab; through the alternative action of multi-pass roll bending and ultrasonic flattening, the residual stress of the composite slab can be significantly reduced, and the performance of the slab can be improved.

[0031] (2) The present application can solve the problems of anisotropy, coarse grains, uneven structure, and incomplete release of residual stress in the composite slab; the process flow is clear, the equipment operation is simple and effective, the dependence on the technical experience of the operator is low, it is easy to popularize, and the practical application effect is good.

[0032] (3) The present application sets heating composite plate-roller bending-ultrasonic flattening-flipping composite slab-reheating-reverse roller bending-reverse ultrasonic flattening as a cycle, and then repeats the above steps twice, to obtain a composite slab with significantly improved performance, the tensile strength is increased by 4.79%, the yield strength is increased by 5.43%, the elongation is increased by 4.82%, the thickness anisotropy coefficient is obviously improved from 0.729 to 0.887, the strain hardening index is increased from 0.029 to 0.042, the grain size is obviously refined and reduced by 60%, the tensile performance is significantly improved, and the cupping value is increased by an average of 21.11%. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A composite plate performance optimization process method diagram for the roll bending-ultrasonic flattening process cycle of the embodiment of the present application;

[0034] Figure 2 A flowchart of the composite plate performance optimization process for the roll bending-ultrasonic flattening process cycle of the embodiment of the present application;

[0035] Figure 3 A composite slab size diagram for the embodiment of the present application;

[0036] Figure 4 A schematic diagram of the ultrasonic flattening device for the embodiment of the present application.

[0037] In the drawings, the main reference signs are as follows:

[0038] 1-ultrasonic generator; 2-transducer; 3-amplifying rod; 4-double head stud; 5-upper anvil; 6-lower anvil; 7-composite plate. DETAILED DESCRIPTION

[0039] Hereinafter, the embodiments of the present application will be described with reference to the drawings.

[0040] The embodiment of the present application inputs energy in the way of ultrasonic vibration generated by the ultrasonic flattening device, can eliminate most of the residual stress, break the crystal grains, improve the microstructure, and achieve the purpose of improving the performance of the slab; through the multi-pass roll bending of the three-roll plate rolling machine and the multiple cycles of ultrasonic flattening, the residual stress of the composite slab is significantly reduced, and the performance of the composite plate is improved. Figure 1 As shown in the figure, it is a composite plate performance optimization process method of roll bending-ultrasonic flattening process cycle of the embodiment of the present application.

[0041] The embodiment of the present application provides a composite plate performance optimization process method of roll bending-ultrasonic flattening process cycle, as shown in the figure. Figure 2 As shown in the figure, it is a process flow chart designed according to the actual production process of the embodiment of the present application; in order to prove the applicability of the present application, it is applied to an example, which specifically includes the following steps:

[0042] S1: According to the related parameters of the composite slab to be optimized, prepare and select an alloy composite slab with a certain thickness and component ratio.

[0043] In this embodiment, a stainless steel aluminum alloy rolling composite plate initial slab with a thickness of 6mm and a layer thickness ratio of 2:1 is prepared and selected, which is cut into a plate with a size of 600mm*300mm, and a plurality of samples with a composite size standard are obtained; as shown in the figure, Figure 3 As shown in the figure, it is a size diagram of the composite slab, which is used to show the shape and size of the standard slab.

[0044] S2: Put the alloy composite slab into the heating furnace for heating.

[0045] Specifically, the composite plate is placed into the heating furnace using a clamp, and the temperature of the heating furnace is adjusted to 150-200℃.

[0046] S3: Repeatedly roll bending the heated composite slab using the plate rolling machine to roll into a preset angle arc shape;

[0047] The slab is placed into the gap between the upper and lower rollers, which is mainly used to roll the slab into a circular arc shape with an angle of 150°.

[0048] The compressive stress provided by the upper roller of the plate rolling machine exceeds the yield limit of the material, and the composite slab will be plastically deformed, then the lower roller is rotated to drive the composite plate to rotate, and the composite plate is bent into a slab with a certain arc, the outer layer of the slab is stretched, the inner layer is compressed, and the neutral layer changes to a smaller extent, and a deformation texture is formed, which reshapes the microstructure of the composite plate; according to the recrystallization data obtained under the roll bending condition, the desired grain size can be predicted and obtained by establishing the following dynamic recrystallization model:

[0049] The dynamic recrystallization critical shear strain model during the plate rolling process is shown below:

[0050]

[0051] Where: ε p Indicates peak strain; ε c denoted as critical shear strain; Z represents the temperature-to-strain-rate compensation factor; k1 represents the shear strain linear fitting coefficient; m1 represents the shear strain linear fitting exponent. Represents strain rate (s) -1 Q represents the activation energy for thermal deformation (KJ / mol); R represents the gas constant, specifically 8.314 J·(mol·K). -1 T represents the deformation temperature (K);

[0052] The dynamic recrystallization volume fraction model during the plate rolling process is shown below:

[0053]

[0054] In the formula: X drx Indicates the volume fraction of dynamic recrystallization; k d The volume fraction linear fitting coefficients are represented by m. d The linear fit index represents the volume fraction.

[0055] The dynamic recrystallization grain size model during the plate rolling process is shown below:

[0056]

[0057] In the formula: k2 represents the linear fitting coefficient of grain size; m2 represents the linear fitting exponent of grain size;

[0058] The average grain size of the microstructure after dynamic recrystallization during the rolling process of a plate rolling machine is called the average grain size of dynamic recrystallization, and its calculation formula is as follows:

[0059] D avg =D drx X drx +D0(1-X drx );

[0060] In the formula: D avg D0 represents the average grain size during dynamic recrystallization; D0 represents the initial grain size.

[0061] The composite slab heated by multiple roll bending processes using a plate rolling machine in step S3 specifically involves:

[0062] S31. Use a clamp to place the first end of the heated composite slab flat on the surface of the two lower rollers, so that the first end of the composite slab extends a certain distance beyond the lower roller on the side of the composite slab's forward direction.

[0063] S32. Adjust the position of the composite slab blank so that the side of the composite slab blank is perpendicular to the generatrix of the lower roller; adjust the position of the upper roller to contact the upper surface of the composite slab blank, and press down a certain distance with the initial pressing amount to make the composite slab blank bend and deform. Rotate the lower roller to use the friction between the roller and the composite slab to make the board move and cause the overall bending deformation.

[0064] S33. Gradually increase the pressure of the upper roller to make the lower roller rotate in the opposite direction, and repeatedly roll the heated composite slab into an arc shape with a set angle.

[0065] During the rolling process, the compressive stress provided by the upper roller of the rolling mill exceeds the yield limit of the material, causing the composite slab to undergo plastic deformation. Then, the lower roller of the rolling mill rotates, causing the composite plate to rotate and bend into an arc-shaped slab with a certain curvature. At this time, the outer grains and structure of the slab are stretched, while the inner grains and structure are compressed.

[0066] S4: Invert the heated composite slab onto the mold and perform ultrasonic leveling.

[0067] The slab was inverted and flipped onto the mold for ultrasonic leveling. The device was set to a power of 3KW, a frequency of 20KHz, and an amplitude of 40μm. Figure 4 The diagram shown is a schematic of the ultrasonic leveling device according to an embodiment of the present invention. By inputting energy through physical ultrasonic vibration, it can eliminate most of the residual stress, break up grains, and improve the microstructure, thereby improving the performance of the slab.

[0068] Ultrasonic vibration can apply periodic dynamic stress to metal components. The dynamic stress is superimposed on the residual stress inside the metal component. When the superposition amplitude is greater than the yield limit of the metal component, a small plastic deformation will occur, thereby releasing the residual stress.

[0069] The formula for calculating the reduction in residual stress based on the results before and after ultrasonic vibration is as follows:

[0070]

[0071] Where: ε x ε represents the reduction in transverse residual stress. y ν represents the reduction in shear stress and residual stress; E represents the elastic modulus of the composite slab; ν represents the Poisson's ratio of the composite slab. The calibration factor representing axial stress; The calibration coefficient represents the shear stress; ε1 represents the first principal stress; ε3 represents the third principal stress.

[0072] Due to the ultrasonic vibration, the residual stress generated by the roll bending process is released more completely, reducing warping, twisting deformation and cracking of the composite board under subsequent inappropriate heat treatment, welding and cutting conditions.

[0073] Ultrasonic vibration can not only eliminate residual stress in roll-bent plates, but also increase the activity of internal grains and structures after absorbing vibration energy, increase thermal vibration speed, raise material temperature, and cause dislocation-related thermal softening, thereby reducing the dynamic deformation resistance and flow stress of the material and enhancing the fluidity of the metal during plastic deformation of the composite plate. On the other hand, during plastic deformation, high-frequency ultrasonic vibration can break up the grains to a certain extent, significantly improving the internal structure of the composite plate, greatly improving mechanical properties and ductility, and enhancing machining, plastic deformation, and overall mechanical properties.

[0074] S5: Flip the composite slab and repeat S2-S4;

[0075] After flipping, the composite slab is reheated and then rolled into an arc shape with the same angle using a plate rolling machine. Finally, it is ultrasonically leveled. Reverse ultrasonic leveling improves the comprehensive mechanical properties of the composite slab, releases the residual stress generated by the multiple roll bending process, and can restore the problem of reduced plastic deformation capacity caused by the roll bending process, laying the foundation for cyclic action.

[0076] S6: Repeat S2-S5 twice more to obtain a composite slab with significantly improved performance through cyclic action.

[0077] The cyclic process is as follows: one cycle consists of heating the composite plate, rolling, ultrasonic leveling, reverse rolling, and reverse ultrasonic leveling. Two cycles are performed in total, resulting in a composite slab with significantly improved performance. The tensile strength, yield strength, and elongation are all improved; the thickness anisotropy coefficient is improved; the strain hardening index is increased; the grain size is refined; the tensile properties are significantly improved; and the average cupping value is increased. The performance indicators of the composite slab are significantly improved.

[0078] A second aspect of the invention provides a system for optimizing the performance of composite panels based on a roll bending-ultrasonic leveling process cycle, comprising a heating assembly, a roll bending assembly, and an ultrasonic leveling assembly. The heating assembly includes a heating furnace for heating. The roll bending assembly is used to perform multiple roll bending operations.

[0079] The output of ultrasonic generator 1 is connected to the input of transducer 2. The output of transducer 2 is connected to the input of amplitude transformer 3. The input of amplitude transformer 3 is connected to lower anvil 6, which is fixed on the worktable. Upper anvil 5 is mounted on the upper slide of the hydraulic press. The ultrasonic leveling assembly is used to flatten and ultrasonically level the sheet material. Upper anvil 5, mounted on the upper slide of the hydraulic press, is responsible for opening and closing the composite plate 7. Lower anvil 6 is fixed on the worktable and connected to amplitude transformer 3, transducer 2, and ultrasonic generator 1 via a matching double-ended stud 4.

[0080] The various indicators of the final formed composite sheet were tested. The microstructure and geometry of the composite sheet were observed and analyzed using an optical microscope. The comprehensive mechanical properties, thickness anisotropy coefficient r, and deformation strengthening index n of the samples were tested on a universal testing machine. The deep drawing performance of the composite sheet was tested using a cupping test. On the one hand, the comprehensive mechanical properties of the composite sheet after reverse ultrasonic leveling have been improved. The residual stress generated by the multi-pass roll bending process has been basically completely released, and the problem of reduced plastic deformation caused by the roll bending process has been restored to a certain extent. This creates conditions for re-deformation of the subsequent roll bending process and also creates the preconditions for cyclic action. On the other hand, the cycle of heating the composite sheet - roll bending process - ultrasonic leveling - reverse roll bending process - reverse ultrasonic leveling is one cycle. The first cycle plus the After two more cycles, a total of three cycles were performed, resulting in a composite slab with significantly improved performance. The tensile strength increased by 4.79%, the yield strength by 5.43%, the elongation by 4.82%, the thickness anisotropy coefficient was significantly improved from 0.729 to 0.887, the strain hardening index increased from 0.029 to 0.042, the grain size was significantly refined and reduced by 60%, the tensile properties were significantly improved, and the cupping value increased by an average of 21.11%, reaching the performance indicators for the end of the cycle. Table 1 shows the comparison of material properties of the composite slab after 0, 1, 2, and 3 cycles. The data in the table shows that the tensile strength, yield strength, elongation, and other performance indices of the composite slab obtained using this process are all significantly improved.

[0081] Table 1 Comparison of Composite Panel Performance

[0082] Cycles 0 1 2 3 Tensile strength (MPa) 277.4 284.2 287.3 290.7 Yield strength (MPa) 211.7 216.9 220.7 223.2 Elongation (%) 24.9 25.6 25.9 26.1 Thick anisotropy coefficient (r) 0.729 0.747 0.821 0.887 Strain hardening exponent (n) 0.029 0.034 0.038 0.042 Grain size (μm) 120 75 55 48 Average cupping value ① (mm) 10.1 10.7 11.4 11.9 Average cupping value ② (mm) 8.2 8.8 9.6 10.2

[0083] In the table, the average cupping value ① represents the average level of cupping value of the composite panel when the stainless steel layer is on the outside; the average cupping value ② represents the average level of cupping value of the composite panel when the aluminum layer is on the outside.

[0084] As can be seen from the table, after three cycles, all properties have been greatly improved. This also shows that the composite plate performance optimization process of the roller bending-ultrasonic leveling cycle in this case proves that it has a very good application effect.

[0085] In the remaining embodiments, different numbers of cycles can be selected according to the needs of different materials, and plates with beneficial properties can be obtained in all cases.

[0086] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for optimizing the performance of composite panels based on a roller bending-ultrasonic leveling process cycle, characterized in that, It includes the following steps: S1. Select an alloy composite slab of appropriate thickness based on the set thickness and alloy material. S2. The composite slab is placed in a heating furnace and heated. S3. Repeatedly roll and bend the heated composite slab to form an arc shape at a certain angle: The composite slab blank is repeatedly rolled and bent using a plate rolling machine to make the grains of the composite slab uniform and refined. S4. After repeated rolling and bending, the composite slab is inverted and flipped onto the mold for ultrasonic leveling: Ultrasonic vibration applies periodic dynamic stress to the composite slab. The dynamic stress is superimposed on the residual stress inside the composite slab, causing the alloy composite slab to undergo slight plastic deformation, thus releasing the residual stress. S5. Flip the composite slab blank, reheat the composite slab blank after flipping, and then use a plate rolling machine to roll it into an arc shape with the same preset angle, and then perform ultrasonic leveling. S6. Set the heating composite plate-roll bending-ultrasonic leveling-turning composite blank-reheating-reverse roll bending-reverse ultrasonic leveling of steps S2-S5 as a cycle, and then repeat steps S2-S5 multiple times to obtain the composite blank. The composite slab heated by multiple roll bending processes using a plate rolling mill in step S3 specifically refers to: S31. Place the first end of the heated composite slab flat on the surface of the two lower rollers, so that the first end of the composite slab extends a certain distance beyond the lower roller on the side of the composite slab's forward direction. S32. Adjust the position of the composite slab blank so that the side of the composite slab blank is perpendicular to the generatrix of the lower roller; adjust the position of the upper roller to contact the upper surface of the composite slab blank, and press down a certain distance with the initial pressing amount to make the composite slab blank bend and deform. Rotate the lower roller to use the friction between the roller and the composite slab to make the board move and cause the overall bending deformation. S33. Gradually increase the pressure of the upper roller to make the lower roller rotate in the opposite direction, and repeatedly roll the heated composite slab into an arc shape with a set angle. During the rolling process, the compressive stress provided by the upper roller of the rolling mill exceeds the yield limit of the material, causing the composite slab to undergo plastic deformation. Then, the lower roller of the rolling mill rotates, causing the composite plate to rotate and bend into an arc-shaped slab with a certain curvature. At this time, the outer grains and structure of the slab are stretched, while the inner grains and structure are compressed.

2. The composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to claim 1, characterized in that: The loop in step S6 is repeated twice.

3. The composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to claim 1, characterized in that: In step S2, a heating furnace is used to heat the composite slab, which is placed inside the furnace and heated to 150°C-200°C.

4. The composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to claim 1, characterized in that: The step S3 of rolling the composite slab into a pre-set angle arc shape refers to rolling the composite slab into an arc shape with an angle of 150°-160°.

5. The composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to claim 1, characterized in that: The ultrasonic leveling in step 4 involves setting the ultrasonic generator to a power of 0-3KW, a frequency of 20KHz, and an amplitude of 30-50μm.

6. The composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to claim 1, characterized in that: In step S1, an initial slab of stainless steel-aluminum alloy rolled composite plate with a thickness of 2-6 mm and a layer thickness ratio of 2:1 is prepared and selected in advance, and cut into 600 mm × 300 mm plate samples.

7. A composite plate performance optimization system for implementing the composite plate performance optimization method based on the roll bending-ultrasonic leveling process cycle according to any one of claims 1 to 4, characterized in that: The system includes a heating assembly, a roller bending assembly, and an ultrasonic leveling assembly. The heating assembly includes a heating furnace, the roller bending assembly includes multiple bending rollers arranged in parallel, and the ultrasonic leveling assembly includes an upper anvil, a lower anvil, a transducer, an amplitude transformer, and an ultrasonic generator. The output end of the ultrasonic generator is connected to the input end of the transducer, the output end of the transducer is connected to the first end of the amplitude transformer, the second end of the amplitude transformer is connected to the lower anvil, the lower anvil is fixed on the worktable, and the upper anvil is installed on the upper slide of the hydraulic press.

8. The composite panel performance optimization system according to claim 7, characterized in that: The two ends of the amplitude transformer are connected to the lower anvil and the transducer respectively by means of double-ended studs.

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