Electromagnetic-assisted aluminum alloy laser shock forming method and device

Abstract

The present invention provides an electromagnetic-assisted aluminum alloy laser shock forming method and apparatus. The method divides the surface of an aluminum alloy sheet into an inner concave surface and an outer convex surface according to the sheet bending forming requirements. An electric field is applied to both ends of the aluminum alloy sheet, and a magnetic field is applied to the other ends of the sheet. The electric field is perpendicular to the magnetic field. The magnetic field forces separate the positive and negative charges generated by the electric field, distributing positive charges on the inner concave surface and negative charges on the outer convex surface. An absorption layer is applied to the inner concave surface, and a continuous flow constraining layer is provided on the inner concave surface. A pulsed laser is applied to the inner concave surface to produce an aluminum alloy sheet with a curved shape. Under the action of the electric current and magnetic field, the present invention significantly reduces the flow stress and deformation resistance of the aluminum alloy sheet, effectively suppresses the surface stress rebound of the material, and significantly increases the ultimate forming size of the sheet.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloy sheet forming, and in particular to an electromagnetic-assisted aluminum alloy laser shock forming method and device. Background Art

[0002] Aluminum alloys offer low specific gravity and high strength, meeting the design and development requirements for lightweight aerospace equipment and are widely used in complex thin-walled components within the aerospace sector. Currently, thin-walled components are primarily formed using die-forming, which results in poor component quality and high mold costs. While suitable for mass production of simple thin-walled components, it struggles to meet the demands of the new era for producing a wide variety of high-performance, thin-walled components from aviation aluminum alloys in small batches. Therefore, developing efficient and precise dieless forming technologies for complex thin-walled components from aviation aluminum alloys holds significant research and application value.

[0003] Currently, in the field of sheet metal forming, a variety of dieless forming technologies exist that can achieve the forming of thin-walled aluminum alloy components, such as hammer incremental forming, digital incremental forming, and mechanical impact forming. However, these forming processes are subject to their own limitations, resulting in poor surface quality, prone to springback, and low forming precision, making them difficult to apply to aviation aluminum alloy components in complex application environments.

[0004] Laser shock forming, a new dieless forming technology, has been widely used in the field of sheet metal forming. It uses GPa-level plasma shock waves generated by laser irradiation on the surface of the metal sheet to cause the metal sheet to undergo plastic deformation with no rebound and ultra-high strain rates. It is a fast, high-precision, and integrated forming and strengthening technology for sheet metal stress forming. For example, the existing technology proposes a multi-point laser shock forming method, which uses multiple lasers to impact corresponding positions on the sheet to achieve overall forming of the sheet. However, due to the inability to overcome the work hardening of the metal sheet during the laser shock forming process, the ultimate forming size of the metal sheet is relatively small. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention provides an electromagnetic-assisted aluminum alloy laser shock forming method and apparatus. This method achieves macroscopic shaping of aluminum alloy sheets by introducing electric current and magnetic field-assisted laser shock. Under the action of electric current and magnetic field, the flow stress and deformation resistance of the aluminum alloy sheet are significantly reduced, effectively suppressing the material's surface stress rebound and significantly increasing the sheet's ultimate forming size. Influenced by electroplasticity and the Hall effect, the near-surface grains of the aluminum alloy sheet substrate prepared by electromagnetic-assisted laser shock are refined, the hardness is significantly increased, and no tensile microcracks are generated. The surface quality of the formed sheet is also effectively improved, resulting in high mechanical strength for the formed thin-walled aviation aluminum alloy components.

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

[0007] An electromagnetic-assisted aluminum alloy laser shock forming method comprises the following steps:

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

[0009] An electric field is applied to both ends of the aluminum alloy plate, and a magnetic field is applied to the other two ends of the aluminum alloy plate, wherein the direction of the electric field is perpendicular to the direction of the magnetic field, and the positive and negative charges generated by the electric field are separated by the magnetic field force, with positive charges distributed on the inner concave surface and negative charges distributed on the outer convex surface;

[0010] An absorption layer is coated on the concave surface, a continuous flow constraint layer is provided on the concave surface, and the concave surface is impacted by a pulsed laser to obtain an aluminum alloy plate with a curvature.

[0011] Furthermore, the method further comprises the following step: pre-treating the surface of the aluminum alloy plate to make the surface roughness value ≤50 μm.

[0012] 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 and dried using an anhydrous ethanol solution.

[0013] Furthermore, fixing fixtures are installed at both ends of the aluminum alloy plate. The fixing fixtures are made of conductive material. The two fixing fixtures are respectively connected to current generators to generate an electric field at both ends of the aluminum alloy plate.

[0014] Furthermore, a gap is provided between the outer convex surface of the aluminum alloy plate mounted on the fixing fixture and the bottom surface of the fixing fixture, so as to reserve space for deformation of the aluminum alloy plate.

[0015] Furthermore, the adjustable range of the current intensity in the aluminum alloy plate does not exceed 1 kA.

[0016] Furthermore, the adjustable range of the magnetic field intensity in the aluminum alloy plate does not exceed 1000 mT.

[0017] Furthermore, the spot of the pulse laser is a circular flat-top spot, the spot diameter of the pulse laser is 1 to 5 mm, the pulse frequency of the pulse laser is 10 Hz, the pulse width of the pulse laser is 10 to 25 ns, the pulse energy of the pulse laser is 1 to 11 J, and the spot overlap rate of the pulse laser is 20% to 80%.

[0018] A device for an electromagnetic-assisted aluminum alloy laser shock forming method, comprising a fixing fixture, a laser, a current generator, a magnetic field generator, and a controller;

[0019] The laser is used to generate a pulsed laser, which impacts the concave surface of the aluminum alloy plate; the two ends of the aluminum alloy plate are fixed by fixing fixtures, and the fixing fixtures are made of conductive material. The two fixing fixtures are respectively connected to a current generator to generate an electric field at the two ends of the aluminum alloy plate; magnetic field generators are placed at the other two ends of the aluminum alloy plate to generate a magnetic field; the direction of the magnetic field is perpendicular to the direction of the electric field;

[0020] The controller controls the current intensity generated by the current generator and the magnetic field intensity generated by the magnetic field generator respectively.

[0021] The beneficial effects of the present invention are:

[0022] 1. The electromagnetic-assisted aluminum alloy laser shock forming method described in the present invention, based on conventional laser shock forming, assists in regulating the sheet forming process by applying an external electromagnetic energy field. Moving charged particles in the magnetic field are acted upon by the Lorentz force and distributed on the upper and lower surfaces of the aluminum alloy sheet, causing the material to undergo flow stress softening, thereby significantly reducing the material's overall resistance to deformation. At the same time, the high current density, under the control of the magnetic field, forms a group of drift electrons that frequently and directionally impact dislocations, improving the dislocation migration ability in the material. This also reduces the elastic stress of the aluminum alloy sheet, reduces the springback of the formed part, and significantly increases the ultimate size of aviation aluminum alloy formed sheet.

[0023] 2. The electromagnetic-assisted aluminum alloy laser shock forming method described in the present invention reduces the microcrack defects generated within the sheet matrix by the huge forming pressure during laser shock forming of aviation aluminum alloy sheets through the electro-shaping and Joule heating effects generated by the current-magnetic field within the aviation aluminum alloy material. The electro-shaping generated when the current passes through the metal material significantly reduces the deformation resistance of the aluminum alloy sheet, effectively hindering the large-scale generation of microcracks within the matrix material; under the control of the magnetic field, the electrons drift in a direction. When passing through the defective lattice, the vibration frequency and energy of the atoms increase, resulting in an increase in the temperature at the defect and an increase in the diffusion capacity of the atoms. This has a good healing effect on the microcracks formed during the laser shock forming process, and the mechanical properties of the matrix material of the formed sheet are effectively improved.

[0024] 3. The electromagnetic-assisted aluminum alloy laser shock forming method described in the present invention applies the electromagnetic-magnetic coupling excitation effect to form a deeper stress-affected layer on the aviation aluminum alloy plate formed by laser shock, the grain size near the surface is reduced, the hardness is increased, and the surface quality of the formed part is significantly improved. This has an important promoting significance for the specific application of aviation aluminum alloy formed thin-walled components in complex service environments, and shows a broad industrial application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the principle of the electromagnetic-assisted aluminum alloy laser shock forming method described in the present invention.

[0027] Figure 2 This is a path diagram of electromagnetic-assisted laser shock forming of aluminum alloy in Example 1 of the present invention.

[0028] Figure 3 This is a diagram showing the actual forming effect of an aluminum alloy plate in Example 1 of the present invention.

[0029] Figure 4 These are outlines of aluminum alloy sheets formed according to various embodiments of the present invention.

[0030] Figure 5 Surface roughness diagram of aluminum alloy plates formed according to various embodiments of the present invention.

[0031] Figure 6 Graphs showing residual stress on the surface of aluminum alloy plates formed in various embodiments of the present invention.

[0032] In the picture:

[0033] 1- pulsed laser; 2- fixing fixture; 3- current generator; 4- absorption layer; 5- inner concave surface; 6- outer convex surface; 7- N-pole magnet; 8- S-pole magnet. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] like Figure 1 and Figure 2 As shown, the electromagnetic-assisted aluminum alloy laser shock forming method of the present invention includes the following steps:

[0039] The surface of the aluminum alloy plate was pretreated by grinding and polishing the plate surface with sandpaper of different particle sizes, and the treated surface was ultrasonically cleaned and dried with anhydrous ethanol solution to make the surface roughness value ≤50μm;

[0040] 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;

[0041] An electric field is applied to both ends of the aluminum alloy sheet, and a magnetic field is applied to the other ends of the sheet. The direction of the electric field is perpendicular to the direction of the magnetic field. The magnetic field forces the positive and negative charges generated by the electric field to separate, with positive charges distributed on the inner concave surface 5 and negative charges distributed on the outer convex surface 6. Specifically, a fixing clamp 2 is installed at both ends of the aluminum alloy sheet. The aluminum alloy sheet and the fixing clamp 2 are connected with bolts to provide a high preload force. The fixing clamp 2 is made of a conductive material, typically a copper alloy. The two fixing clamps 2 are respectively connected to a current generator 3 to generate an electric field at both ends of the aluminum alloy sheet.

[0042] An absorbing layer 4 is coated on the concave surface 5, and a continuously flowing constraining layer is provided on the concave surface 5. A pulsed laser 1 is applied to the concave surface 5, and appropriate laser parameters and travel paths are selected to produce a curved aluminum alloy sheet under electromagnetic assistance. The absorbing layer 4 is black tape, and the constraining layer is flowing silicone oil.

[0043] The electromagnetic-assisted aluminum alloy laser shock forming method described in the present invention regulates the laser shock forming process of aluminum alloy sheets with the assistance of electromagnetic energy field coupling. Under the action of current-magnetic field coupling, the plastic deformation capacity of the aluminum alloy material is improved, the rebound of the laser shock sheet is reduced, and the forming limit size is greatly increased. Influenced by electroforming and Joule heating effects, microcracks within the laser shock-formed aluminum alloy sheet are effectively suppressed and closed, thereby achieving improved mechanical properties of the formed sheet matrix. At the same time, compared with conventional laser shock forming processes, the near-surface grain size of the formed aluminum alloy sheet is finer, the hardness is increased, and the surface quality of the formed part is effectively improved, resulting in the prepared aviation aluminum alloy formed thin-walled components with higher forming precision and forming quality.

[0044] In order to make the purpose, technical solutions and advantages of the present invention clearer, 2024-T351 aviation aluminum alloy is selected as the research object, and the present invention is described in detail in combination with specific embodiments.

[0045] Example 1:

[0046] The electromagnetic-assisted aluminum alloy laser shock forming method of the present invention comprises the following steps:

[0047] S01: Cut 2024-T351 aviation aluminum alloy sheets into strips with a length of 80 mm, a width of 30 mm, and a thickness of 0.8 mm. Then, use sandpaper of different particle sizes to reduce the surface roughness of the sheets to below 50 μm. The treated surface is then ultrasonically cleaned and dried.

[0048] S02: Mount the pretreated aluminum alloy plate at both ends in the length direction on a copper fixture 2. The copper fixture 2 can be used as an electrode. The aluminum alloy plate and the fixture 2 are connected with bolts to provide preload force. Black tape is adhered to the inner concave surface 5 of the aluminum alloy plate as a laser shock absorbing layer, and continuously flowing silicone oil is used as a constraining layer.

[0049] S03: N-pole magnets 7 and S-pole magnets 8 are placed on both sides of the aluminum alloy plate in the width direction. The magnetic flux lines generated by the N-pole magnets 7 and S-pole magnets 8 are perpendicular to the direction of current movement. The high-energy current flowing into the aluminum alloy is regulated so that positive and negative charges are accumulated on the upper and lower surfaces of the aluminum alloy respectively. The magnetic field strength is 500mT and the current is 500A.

[0050] S04: The aluminum alloy plate is pre-energized for 60 seconds. After the temperature rise of the upper and lower surfaces stabilizes, the aluminum alloy surface is impacted with a Nd:YAG high-repetition-rate, high-energy nanosecond pulse laser. The laser parameters are: frequency 10 Hz, pulse width 10 ns, spot diameter 3 mm, laser energy 6 J, overlap rate 20%, and impact number 1. The impact path is as follows: Figure 2 As shown, a formed aviation aluminum alloy sheet with a curvature is obtained.

[0051] The actual effect of the formed aluminum alloy plate prepared in Example 1 is as follows Figure 3 As shown, the contour curve of the deformation of the aluminum alloy plate is as follows Figure 4 As shown in the figure, under the single laser shock plastic forming mechanism, the maximum deformation depth of the formed aluminum alloy sheet is only 1.91mm, while the maximum deformation depth of the aluminum alloy sheet formed by electromagnetic assisted forming is 2.93mm. Compared with the aluminum alloy sheet formed by laser shock forming without energy field assistance, the maximum deformation depth is increased by 53.4%. The electromagnetic energy field assistance effectively improves the plastic deformation ability of the aluminum alloy material, making the laser shock forming achieve a larger plate deformation. Figure 5 As shown in the figure, the surface roughness of the aluminum alloy plate formed in Example 1 is 6.7 μm, which is 34.9% lower than the surface roughness of 10.3 μm of the aluminum alloy plate formed by laser shock assisted without energy field. The aluminum alloy plate formed by electromagnetic assisted laser shock assisted has higher surface quality. Figure 6 As shown, the average compressive residual stress on the laser-shocked side of the formed aviation aluminum alloy sheet produced in Example 1 reached -219 MPa, a significant improvement compared to the average residual stress of -21 MPa on the surface of the untreated sample, and a 9% increase compared to the average compressive residual stress of -201 MPa on the surface of the sample produced by the non-field-assisted laser shock forming process. The electromagnetic energy field-assisted laser shock forming increases the forming capability of aviation aluminum alloy sheet and significantly improves the forming quality of the sheet.

[0052] Example 2

[0053] Based on Example 1, the laser shock process parameters in Example 2 are set as: pulse width 20ns, spot diameter 4mm, laser energy 8J, overlap rate 50%; the electromagnetic assisted process parameters are: magnetic field intensity 800mT, current size 800A.

[0054] The contour curve of the formed aviation aluminum alloy plate prepared in Example 2 is as follows: Figure 4 As shown in FIG. 1 , the maximum deformation depth of the aluminum alloy sheet formed by electromagnetic-assisted laser shock forming is 3.55 mm, which is 19.4% higher than the maximum deformation depth of 2.93 mm of the aluminum alloy sheet formed in Example 1. Figure 5 As shown in FIG. 1 , the surface roughness of the aluminum alloy plate formed in Example 2 is 6.9 μm, which is slightly higher than that of the plate formed in Example 1. Figure 6 As shown, the residual stress on the laser-shocked side surface of the formed aluminum alloy sheet produced in Example 2 reached -235 MPa, a 7.3% increase compared to the -219 MPa residual stress on the surface of the formed aluminum alloy sheet produced in Example 1. With the increase in the electromagnetic energy field and laser shock parameters, the forming volume of the aluminum alloy sheet and the residual compressive stress value within the base material further increased, improving the mechanical properties of the formed sheet.

[0055] Example 3

[0056] Based on Example 1, the laser shock process parameters in Example 3 are set as follows: pulse width 25ns, spot diameter 5mm, laser energy 10J, overlap rate 80%; electromagnetic assisted process parameters are: magnetic field strength 1000mT, current size 1000A.

[0057] Example 3 The deformation profile curve of the aluminum alloy plate is as follows Figure 4 As shown, the maximum deformation depth of the formed aluminum alloy plate is 3.89 mm, which is 32.7% higher than the maximum deformation depth of 2.93 mm of the formed aluminum alloy plate prepared in Example 1, and 9.6% higher than the maximum deformation depth of 3.55 mm of the formed aluminum alloy plate prepared in Example 2. Figure 5 As shown in the figure, the surface roughness of the aluminum alloy plate formed in Example 3 is 7.5 μm, which is 8.6% higher than the surface roughness of the aluminum alloy plate formed in Example 2, which is 6.9 μm. The laser shock energy in Example 3 is greatly increased, but due to the influence of the electromagnetic energy field, the increase in the surface roughness of the formed plate is relatively small. Figure 6 As shown in the figure, due to the effect of laser shock stress saturation, the residual stress value on the laser-shocked side of the aluminum alloy sheet prepared in Example 3 is -236 MPa, which is almost the same as the residual compressive stress within the base material of the aluminum alloy sheet formed in Example 2, both of which have high residual compressive stress values. The electromagnetic-assisted aluminum alloy laser shock forming method proposed in this invention achieves a significant improvement in the strength of the base material and the surface quality of the sheet while increasing the forming limit of the aluminum alloy sheet.

[0058] like Figure 1 As shown, the device of the electromagnetic-assisted aluminum alloy laser shock forming method of the present invention includes a fixing fixture 2, a laser, a current generator 3, a magnetic field generator and a controller;

[0059] The laser is used to generate a pulsed laser 1, which impacts the concave surface 5 of the aluminum alloy plate; the two ends of the aluminum alloy plate in the length direction are fixed by a fixing clamp 2, and the fixing clamp 2 is a conductive material. The two fixing clamps 2 are respectively connected to the current generator 3, which is used to generate an electric field at both ends of the aluminum alloy plate; magnetic field generators are placed at both ends of the aluminum alloy plate in the width direction, which are used to generate a magnetic field; the direction of the magnetic field is perpendicular to the direction of the electric field; the controller controls the current intensity generated by the current generator 3 and the magnetic field intensity generated by the magnetic field generator respectively.

[0060] The magnetic field generator is an N-pole magnet 7 and an S-pole magnet 8. By moving the N-pole magnet 7 and the S-pole magnet 8, the distance between the N-pole magnet 7 and the S-pole magnet 8 is changed, thereby changing the magnitude of the force exerted by the magnetic field on the charge. By adjusting the magnitude of the magnetic field force, the positive and negative charges generated by the electric field are separated. Positive charges are distributed on the concave surface 5, and negative charges are distributed on the convex surface 6. The direction of the magnetic field always remains perpendicular to the direction of the current.

[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. An electromagnetic-assisted aluminum alloy laser shock forming method, characterized in that: The steps include: 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); Fixing fixtures (2) are installed at both ends of the aluminum alloy plate, wherein the fixing fixtures (2) are made of conductive material, and the two fixing fixtures (2) are respectively connected to a current generator (3) for generating an electric field at both ends of the aluminum alloy plate; An electric field is applied to both ends of the aluminum alloy plate, and a magnetic field is applied to the other two ends of the aluminum alloy plate, wherein the direction of the electric field is perpendicular to the direction of the magnetic field, and the positive and negative charges generated by the electric field are separated by the action of the magnetic field force, and the positive charges are distributed on the inner concave surface (5) and the negative charges are distributed on the outer convex surface (6); An absorption layer (4) is coated on the inner concave surface (5), a continuously flowing constraint layer is provided on the inner concave surface (5), and the inner concave surface (5) is impacted by a pulse laser (1) to obtain an aluminum alloy plate with a curvature.

2. The electromagnetic-assisted aluminum alloy laser shock forming method 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 ≤50 μm.

3. The electromagnetic-assisted aluminum alloy laser shock forming method 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 electromagnetic-assisted aluminum alloy laser shock forming method according to claim 1, characterized in that: A gap is provided between the outer convex surface (6) of the aluminum alloy plate mounted on the fixing fixture (2) and the bottom surface of the fixing fixture (2), for reserving space for deformation of the aluminum alloy plate.

5. The electromagnetic-assisted aluminum alloy laser shock forming method according to claim 1, characterized in that: The adjustable range of current intensity in the aluminum alloy plate does not exceed 1kA.

6. The electromagnetic-assisted aluminum alloy laser shock forming method according to claim 1, characterized in that: The adjustable range of the magnetic field intensity in the aluminum alloy plate does not exceed 1000 mT.

7. The electromagnetic-assisted aluminum alloy laser shock forming method according to claim 1, characterized in that: The light spot of the pulse laser (1) is a circular flat-top light spot, the light spot diameter of the pulse laser (1) is 1 to 5 mm, the pulse frequency of the pulse laser (1) is 10 Hz, the pulse width of the pulse laser (1) is 10 to 25 ns, the pulse energy of the pulse laser (1) is 1 to 11 J, and the light spot overlap rate of the pulse laser (1) is 20% to 80%.

8. A device for electromagnetic-assisted aluminum alloy laser shock forming according to any one of claims 1 to 7, characterized in that: It includes a fixing fixture (2), a laser, a current generator (3), a magnetic field generator and a controller; The laser is used to generate a pulsed laser (1), and the pulsed laser (1) impacts the inner concave surface (5) of the aluminum alloy plate; the two ends of the aluminum alloy plate are fixed by a fixing fixture (2), and the fixing fixture (2) is made of a conductive material. The two fixing fixtures (2) are respectively connected to a current generator (3) for generating an electric field at the two ends of the aluminum alloy plate; a magnetic field generator is placed at the other two ends of the aluminum alloy plate for generating a magnetic field; the direction of the magnetic field is perpendicular to the direction of the electric field; The controller controls the current intensity generated by the current generator (3) and the magnetic field intensity generated by the magnetic field generator respectively.

Images