Laser heating assisted ultrasonic impact forming method and system for aluminum alloy medium and thick plates

Abstract

The present invention provides a laser heating-assisted ultrasonic impact forming method and system for medium-thick aluminum alloy plate materials, comprising the following steps: dividing the surface of the aluminum alloy plate material into an inner concave surface and an outer convex surface according to the plate bending forming requirements; coating the inner concave surface with a heat-resistant layer; impacting the outer convex surface with ultrasonic shock waves, and assisting with the application of a continuous laser beam irradiation to the inner concave surface at the corresponding position of the ultrasonic shock wave impact; and synchronously moving the ultrasonic shock wave and the continuous laser beam along a travel path to obtain an aluminum alloy plate material having a curvature. The present invention utilizes the coupling effect of thermal softening by laser irradiation and acoustic softening by ultrasonic impact to effectively reduce the material's flow stress and deformation resistance, improve the forming limit of the aluminum alloy plate material, and overcome the disadvantage of the small deformation of the plate material formed by single ultrasonic impact forming.

Description

Technical Field

[0001] The present invention relates to the field of metal sheet forming and processing, and in particular to a laser heating assisted ultrasonic impact forming method and system for aluminum alloy medium and thick plates. Background Art

[0002] Due to its high strength, toughness, ductility, and excellent processability, aluminum alloy medium-thick sheets with a thickness of 4-10mm are the primary material for aircraft skins and high-speed rail car hulls, and are widely used in high-speed rail and aircraft equipment. To ensure the performance of these equipment, aluminum alloy medium-thick sheets are often processed into components with complex curvatures and precise dimensions. Due to the harsh service environments of these equipment, it is crucial to balance the surface quality of the sheet with the mechanical properties of the base material during sheet forming.

[0003] Currently, using traditional processing methods, it is difficult to achieve the required forming quality for medium- and thick-walled aluminum alloy sheet metal parts. Numerous new forming processes are being explored to achieve high-quality forming of sheet metal. Among these, laser thermal stress forming (laser bending) leverages the thermal effects of laser irradiation on the material surface, based on the material's thermal expansion and contraction properties. When a high-energy laser beam scans the surface of a metal sheet, it generates a spatial and temporal gradient temperature field within the sheet's substrate material, inducing unbalanced thermal stresses in the thickness direction, causing deformation. The accumulation of localized deformation completes the dieless forming of the sheet. For example, prior art discloses a laser bending process for aluminum alloy thin sheet metal that utilizes the thermal effects of laser irradiation on the material surface to achieve dieless forming. However, this method requires deep heating to overcome the material's dynamic yield strength during the forming process, which can easily lead to a decrease in the mechanical properties of the sheet's substrate material. Furthermore, direct laser action on the material surface can cause ablation damage, resulting in poor surface quality, uneven heating of the sheet, and difficulty in controlling stress distribution. The residual tensile stress generated after heating can reduce the service life of the formed part.

[0004] Ultrasonic impact forming technology is based on ultrasonic impact strengthening and mechanical impact forming technologies. Its principle is to use an ultrasonic generator and ultrasonic transducer to convert electrical signals into mechanical vibrations at ultrasonic frequencies. The output end of the transducer is connected to a variable amplitude rod to amplify the ultrasonic amplitude. The ultrasonic vibration is then applied to a metal striker, causing the striker to obtain high impact kinetic energy, thereby causing microscopic plastic deformation on the surface of the sheet. The uneven plastic deformation will cause residual compressive stresses within the material, causing the original balance of forces within the material to change, inducing macroscopic bending deformation of the sheet, thereby achieving the forming of the metal sheet. Compared with traditional mechanical impact forming technology, it has the advantages of greater processing flexibility and high precision. For example, the prior art discloses a method for ultrasonic shot peening of single and double curvature integral wall panels. This method realizes the automation of ultrasonic impact forming of metal sheets through CNC programming. However, when ultrasonic impact forming medium and thick aluminum alloy sheets, the force provided is relatively small and the forming ability is weak, resulting in a long processing time and difficulty in adapting to the macroscopic forming of medium and thick aluminum alloy sheets. In addition, the subsequent impact forming is more difficult to achieve due to the hardening effect of ultrasonic impact on the material. Summary of the Invention

[0005] In response to the shortcomings of the prior art, the present invention provides a laser heating-assisted ultrasonic impact forming method and system for aluminum alloy medium and thick plates. By integrating the advantages of laser thermal stress forming and ultrasonic impact forming, the two technologies are closely combined, and the coupling effect of laser irradiation thermal softening and ultrasonic impact sound softening is utilized to effectively reduce the flow stress and deformation resistance of the material, improve the forming limit of the aluminum alloy plate, and overcome the shortcoming of small deformation of the plate formed by single ultrasonic impact forming; at the same time, ultrasonic impact forming introduces high-amplitude residual compressive stress in the upper and lower surfaces of the plate, effectively suppressing the harmful tensile stress effect caused by laser thermal stress, and significantly enhancing the mechanical properties of the formed aluminum alloy plate; in addition, local laser heating reduces the formation of fine-layer lamellar brittle hard phases in the heated forming area, suppresses the initiation of cracks inside the overall heated matrix material, and effectively improves the surface accuracy of the formed part.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A laser heating-assisted ultrasonic impact forming method for aluminum alloy medium and thick plates comprises the following steps:

[0008] According to the plate bending forming requirements, the surface of the aluminum alloy plate is divided into an inner concave surface and an outer convex surface;

[0009] Applying a heat-resistant layer on the concave surface;

[0010] Using ultrasonic shock waves to impact the convex surface, and assisting in applying continuous laser beam irradiation to the concave surface at positions corresponding to the impact of the ultrasonic shock waves;

[0011] The ultrasonic shock wave and the continuous laser beam are synchronously moved along the travel path to obtain an aluminum alloy plate with a curvature.

[0012] Furthermore, the method further comprises the following steps: pre-treating the surface of the aluminum alloy plate to make the surface roughness value ≤5µm.

[0013] Furthermore, the surface of the aluminum alloy plate is pretreated, specifically, the surface of the plate is ground and polished using sandpaper of different particle sizes, and the treated surface is ultrasonically cleaned using an anhydrous ethanol solution.

[0014] Furthermore, the heat-resistant layer is a flexible heat-resistant film with a thickness of 0.1~1mm.

[0015] Furthermore, during the traveling path, the continuous laser beam keeps acting perpendicularly on the inner concave surface, and the ultrasonic shock wave keeps acting perpendicularly on the outer convex surface.

[0016] Furthermore, the spot diameter of the continuous laser beam is 2-6 mm, the wavelength of the continuous laser beam is 10.6 μm, and the maximum laser power of the continuous laser beam is 250 W.

[0017] Furthermore, the ultrasonic shock wave is generated by an ultrasonic generator, the vibration frequency of the ultrasonic shock wave is 20kHz; the maximum output power of the ultrasonic shock wave is 1500W; the ultrasonic impact head striker of the ultrasonic generator has an amplitude range of 20~100μm and a striker diameter range of 2~6mm.

[0018] Furthermore, the aluminum alloy plate is a medium-thick aluminum alloy plate, and the thickness of the medium-thick aluminum alloy plate is between 4 and 10 mm.

[0019] A system for laser heating-assisted ultrasonic impact forming of medium-thick aluminum alloy plates, comprising an ultrasonic generator, a laser, and a controller; the ultrasonic generator is used to generate ultrasonic shock waves, and the laser is used to generate a continuous laser beam;

[0020] The ultrasonic shock wave acts on the convex surface of the aluminum alloy plate, and the continuous laser beam acts on the concave surface of the aluminum alloy plate at the corresponding position of the ultrasonic shock wave;

[0021] The controller controls the ultrasonic shock wave and the continuous laser beam to move synchronously.

[0022] The beneficial effects of the present invention are:

[0023] 1. The laser heating-assisted ultrasonic impact forming method for medium-thick aluminum alloy plate materials described in this invention utilizes a continuous laser beam to locally heat the impact forming area, building upon conventional ultrasonic impact forming. The combined effects of thermal and acoustic softening significantly reduce the flow stress and deformation resistance of the material in the impact zone, imparting excellent plastic deformation capability to the material, minimizing stress rebound in the formed workpiece, and improving the surface accuracy and ultimate forming dimensions. Furthermore, the thermal effect generated by laser irradiation on the material surface creates a non-uniform temperature gradient stress field across the thickness of the workpiece, effectively reducing the ultrasonic generator output power requirements for ultrasonic impact forming, increasing the deformation of a single ultrasonic impact-formed plate, and broadening the application of ultrasonic impact forming in the forming of medium-thick aluminum alloy plates, thereby enhancing the practicality and versatility of ultrasonic impact forming.

[0024] 2. The laser heating-assisted ultrasonic impact forming method for medium-thick aluminum alloy plate described in this invention uses ultrasonic impact to induce uniform grain refinement and high-density dislocations near the workpiece surface. Simultaneously, high-amplitude residual compressive stress-affected layers are formed on both the upper and lower surfaces of the workpiece. This not only effectively regulates the tensile stress generated by laser heating but also significantly increases the fatigue strength of the workpiece substrate, thereby extending the service life of the workpiece under complex working conditions.

[0025] 3. Compared to bulk heating of aluminum alloy sheet forming, the laser heating-assisted ultrasonic impact forming method described in this invention suppresses the formation of fine, lamellar, brittle, hard phases in the heated forming zone and promotes the production of a large number of high-toughness grains. This solves the problems of internal crack initiation and low surface forming accuracy in the substrate material after bulk heating of the sheet, effectively enhancing the mechanical properties of the formed workpiece.

[0026] 4. The laser-heating-assisted ultrasonic impact forming method for aluminum alloy medium-thick plate described in this invention incorporates a layer of cored asbestos mesh, a flexible, heat-resistant film, within the laser heating zone, effectively preventing direct laser action on the workpiece surface and causing ablation damage. All process parameters can be effectively configured on a computer, making it easy to implement on a large scale in industrial production and promising broad industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1This is a schematic diagram of the principle of the laser heating assisted ultrasonic impact forming method for medium and thick aluminum alloy plates described in the present invention.

[0029] Figure 2 This is a diagram of the ultrasonic impact forming path of Example 1 of the present invention.

[0030] Figure 3 This is a diagram showing the actual effect of aluminum alloy sheet forming according to Example 1 of the present invention.

[0031] Figure 4 Graphs showing deformation profiles of various embodiments of the present invention.

[0032] Figure 5 Graphs of residual stress on the surface of various embodiments of the present invention.

[0033] In the picture:

[0034] 1- continuous laser beam; 2- ultrasonic shock wave; 3- ultrasonic impact head; 4- heat-resistant layer; 5- concave surface; 6- convex surface. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] like Figure 1 As shown, the laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate of the present invention comprises the following steps:

[0040] Pre-treat the surface of the aluminum alloy plate: use sandpaper of different particle sizes to grind and polish the plate surface to a surface roughness value of ≤5µm, and use anhydrous ethanol solution to ultrasonically clean the treated surface and dry it;

[0041] According to the plate bending forming requirements, the surface of the aluminum alloy plate is divided into an inner concave surface 5 and an outer convex surface 6;

[0042] A heat-resistant layer is applied to the inner concave surface 5; the heat-resistant layer is a flexible heat-resistant film;

[0043] The convex surface 6 is impacted by an ultrasonic shock wave 2, and a continuous laser beam 1 is applied to the concave surface 5 at a position corresponding to the impact of the ultrasonic shock wave 2, so as to assist in ultrasonic shock forming by using a laser thermal field;

[0044] The scanning speed of the heated continuous laser beam 1 is the same as the feed speed of the ultrasonic impact head, and their travel trajectories overlap. That is, the ultrasonic shock wave 2 and the continuous laser beam 1 are moved synchronously along the travel path to produce a curved aluminum alloy sheet. The continuous laser beam 1 remains perpendicular to the concave surface 5, and the ultrasonic shock wave 2 remains perpendicular to the convex surface 6.

[0045] Based on the sheet forming requirements, the corresponding travel path and ultrasonic impact parameters are set, and ultrasonic impact forming is performed on medium-thick aluminum alloy sheets with an effective laser thermal field to obtain curved aluminum alloy sheets. The aluminum alloy sheets are medium-thick aluminum alloy sheets with a thickness between 4 and 10 mm.

[0046] The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plates described in the present invention proposes a method for moldless stress control forming of aluminum alloy medium and thick plates, introduces a local laser thermal field to assist the ultrasonic impact plate forming, and under the combined action of the acoustic softening effect and the thermal softening effect, increases the plastic deformation capacity of the plate; at the same time, the ultrasonic impact high-frequency vibration residual stress bending forming is combined with the laser-material thermal effect temperature gradient softening forming. Compared with the conventional ultrasonic impact forming process, the forming limit size of the aluminum alloy plate is increased, and a larger plate deformation amount is obtained, so that ultrasonic impact forming can be applied in the field of aluminum alloy medium and thick plate forming; in addition, ultrasonic impact will form high-amplitude residual compressive stress in the influence layer on the upper and lower surfaces of the formed plate, effectively suppressing the tensile stress generated by laser heating, and significantly improving the mechanical properties and service life of the formed plate.

[0047] In order to make the purpose, technical solutions and advantages of the present invention clearer, the material 2024-T351 aluminum alloy plate is selected as the research object, and the present invention is described in detail in combination with specific embodiments.

[0048] Example 1:

[0049] The laser heating-assisted ultrasonic impact forming method for aluminum alloy medium and thick plates described in Example 1 includes the following specific steps:

[0050] A 160mm×40mm×4mm 2024-T351 aviation aluminum alloy sheet was selected and polished using sandpaper of varying grit sizes to a surface roughness of ≤5µm. The treated surface was ultrasonically cleaned with anhydrous ethanol solution and dried. A 0.2mm thick, cored asbestos mesh, flexible, heat-resistant film was applied to the laser-heated side of the sheet.

[0051] The ultrasonic impact head 3 is adjusted to the impact starting point of the convex surface 6 of the plate, and the laser thermal field is applied synchronously at the relative position of the concave surface 5 of the plate. The scanning speed of the heating laser beam is the same as the feed speed of the ultrasonic impact head, and the trajectory coincides. The continuous laser beam 1 and the ultrasonic impact head 3 always act perpendicularly on the symmetrical two sides of the formed plate. The laser heating power is selected to be 40W;

[0052] According to the forming requirements of the plate, use Figure 2 The travel path shown uses an ultrasonic impact head striker with a diameter of 3 mm, an amplitude of 20 μm, and an impact overlap rate of 0%. The aluminum alloy sheet is ultrasonically impact formed with the assistance of an effective laser thermal field to obtain a formed aluminum alloy sheet with a curvature.

[0053] The actual forming effect of the aviation aluminum alloy sheet prepared in Example 1 is as follows: Figure 3 As shown, the deformation contour curve of the aluminum alloy sheet is as follows Figure 4As shown in the figure, the arc height of the aluminum alloy sheet prepared by conventional ultrasonic impact bending is 0.27mm. Under the influence of the laser thermal field assisted forming mechanism, the yield strength of the aluminum alloy sheet is reduced, and the arc height of the formed aluminum alloy sheet is 1.35mm, which is increased by 400%. Therefore, laser local heating can improve the plastic forming ability of the aluminum alloy sheet, making the deformation of the ultrasonic impact formed sheet significantly increased. Figure 5 As shown in the figure, the average residual stress on the upper surface of the formed aluminum alloy plate prepared in Example 1 is -189.7 MPa, while the residual compressive stress induced on the plate surface by conventional ultrasonic impact is -190.1 MPa. The addition of the laser thermal field does not have a significant effect on the stress value on the surface of the ultrasonic impact formed plate, and can effectively improve the mechanical properties of the matrix material after the plate is formed.

[0054] Example 2:

[0055] On the basis of Example 1, in Example 2, the laser heating power is set to 100 W, a 0.5 mm thick cored asbestos mesh flexible heat-resistant film is selected, the diameter of the ultrasonic impact head striker is selected to be 4 mm, and the amplitude is 50 μm.

[0056] The deformation profile curve of the aluminum alloy plate prepared in Example 2 is as follows: Figure 4 As shown in the figure, the arc height of the formed aluminum alloy plate is 2.68 mm, which is 98.5% higher than the arc height of 1.35 mm of the formed aluminum alloy plate in Example 1. By using a larger laser heating power and ultrasonic impact head striker amplitude, a larger arc height of the formed plate is obtained. Figure 5 As shown in the figure, the average residual stress on the upper surface of the formed aluminum alloy plate prepared in Example 2 is -220.7 MPa, which is 16.3% higher than the residual compressive stress of -189.7 MPa induced in Example 1. As the amplitude of the ultrasonic impact head needle increases, the ultrasonic impact intensity increases accordingly, and the impact force of the needle on the plate surface becomes greater, inducing a larger and deeper residual compressive stress distribution on the plate surface. At the same time, the macro-forming amount of the plate is also effectively increased.

[0057] Example 3:

[0058] On the basis of Example 1, in Example 3, the laser heating power is set to 150W, a 1mm thick cored asbestos mesh flexible heat-resistant film is selected, the diameter of the ultrasonic impact head striker is selected to be 6mm, and the amplitude is 100μm.

[0059] The deformation profile curve of the aluminum alloy plate prepared in Example 3 is as follows: Figure 4As shown in FIG, the arc height of the formed aluminum alloy plate is 3.89 mm, which is 45.1% higher than the arc height of 2.68 mm of the formed aluminum alloy plate in Example 2. With the increase of laser heating power and ultrasonic impact needle amplitude, the bending deformation of the plate increases continuously. The average residual stress on the upper surface of the formed aluminum alloy plate prepared in Example 3 is shown in FIG. Figure 5 As shown, the residual compressive stress is -231.7MPa, which is further improved compared to the residual compressive stress of -220.7Mpa induced in Example 2. On the side of the plate subjected to ultrasonic impact forming, the surface of the plate was measured using an MVC-1000A1 Vickers microhardness tester. The surface hardness of the aluminum alloy plate after ultrasonic impact was 171HV, which was about 31.5% higher than the surface hardness of the aluminum alloy plate without ultrasonic impact, which was 130HV. In addition, on the laser heating side, the hardness of the aluminum alloy plate was also improved, and the surface roughness values ​​before and after plate forming were almost the same, and the thermal effect had little effect on the surface of the formed plate. The laser heating-assisted ultrasonic impact forming method for medium and thick aluminum alloy plates proposed in the present invention achieves the effective strengthening of the matrix material while realizing the macroscopic shaping of the aluminum alloy plate.

[0060] A system for laser heating-assisted ultrasonic impact forming of medium-thick aluminum alloy plates, comprising an ultrasonic generator, a laser, and a controller; the ultrasonic generator is used to generate ultrasonic shock waves 2, and the laser is used to generate a continuous laser beam 1; the ultrasonic shock waves 2 act on the convex surface 6 of the aluminum alloy plate, and the continuous laser beam 1 acts on the concave surface 5 of the aluminum alloy plate at the corresponding position of the ultrasonic impact; the controller controls the synchronous movement of the ultrasonic shock waves 2 and the continuous laser beam 1.

[0061] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0062] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laser heating assisted ultrasonic impact forming method for aluminum alloy medium and thick plates, characterized in that: The following steps are involved: According to the plate bending forming requirements, the surface of the aluminum alloy plate is divided into an inner concave surface (5) and an outer convex surface (6); A heat-resistant layer is applied to the inner concave surface (5); the heat-resistant layer is a flexible heat-resistant film with a thickness of 0.1 to 1 mm; Utilizing an ultrasonic shock wave (2) to impact the outer convex surface (6), and assisting in applying a continuous laser beam (1) to irradiate the inner concave surface (5) at a position corresponding to the impact of the ultrasonic shock wave (2); The ultrasonic shock wave (2) and the continuous laser beam (1) are synchronously moved along a travel path to obtain an aluminum alloy plate with a curvature.

2. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 1, characterized in that: The method further comprises the following steps: pre-treating the surface of the aluminum alloy plate to make the surface roughness value ≤5µm.

3. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 2, characterized in that: The surface of the aluminum alloy plate is pretreated, specifically, the surface of the plate is ground and polished by sandpaper of different particle sizes, and the treated surface is ultrasonically cleaned and dried using an anhydrous ethanol solution.

4. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 1, characterized in that: During the traveling path, the continuous laser beam (1) keeps acting perpendicularly on the inner concave surface (5), and the ultrasonic shock wave (2) keeps acting perpendicularly on the outer convex surface (6).

5. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 1, characterized in that: The spot diameter of the continuous laser beam (1) is 2-6 mm, the wavelength of the continuous laser beam (1) is 10.6 μm, and the maximum laser power of the continuous laser beam (1) is 250 W.

6. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 1, characterized in that: The ultrasonic shock wave (2) is generated by an ultrasonic generator, and the vibration frequency of the ultrasonic shock wave (2) is 20 kHz; the maximum output power of the ultrasonic shock wave (2) is 1500 W; the ultrasonic impact head (3) of the ultrasonic generator has a striker amplitude range of 20 to 100 μm and a striker diameter range of 2 to 6 mm.

7. The laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plate according to claim 1, characterized in that: The aluminum alloy plate is a medium-thick aluminum alloy plate, and the thickness of the medium-thick aluminum alloy plate is between 4 and 10 mm.

8. A system for the laser heating assisted ultrasonic impact forming method of aluminum alloy medium and thick plates according to claim 1, characterized in that: It comprises an ultrasonic generator, a laser and a controller; the ultrasonic generator is used to generate ultrasonic shock waves (2), and the laser is used to generate a continuous laser beam (1); The ultrasonic shock wave (2) acts on the outer convex surface (6) of the aluminum alloy plate, and the continuous laser beam (1) acts on the inner concave surface (5) of the aluminum alloy plate at a position corresponding to the ultrasonic shock wave; The controller controls the ultrasonic shock wave (2) and the continuous laser beam (1) to move synchronously.

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