A method for shot peening to form the torsional shape of a rib-less airfoil panel

Abstract

This invention belongs to the field of shot peening forming technology for aircraft wing panels, and particularly relates to a method for shot peening forming a torsional shape of a ribless wing panel, comprising the following steps: Step 1: pre-bending and clamping the torsional shape region; Step 2: performing chordal shot peening forming on the outer surface of the torsional shape region; Step 3: performing spanwise shot peening forming on the inner surface of the torsional shape region; Step 4: pre-bending and clamping the torsional shape region; Step 5: performing equal pressure shot peening on the inner and outer surfaces of the torsional shape region.

Description

Technical Field

[0001] This invention belongs to the field of shot peening forming technology for aircraft wing panels, and particularly relates to a shot peening forming method for the torsional shape of a wing panel without ribs. Background Technology

[0002] Shot peening is a plastic forming method that uses a high-speed jet of shot to impact the surface of a part, creating a plastic strain layer in the surface material. This causes beneficial changes in the microstructure of this layer and introduces a residual compressive stress layer, resulting in plastic deformation of the part to achieve the desired shape. Shot peening is particularly suitable for processing medium to large aircraft wing panels, especially complex hyperboloid wing panels. Currently, most wing panels are hyperboloid, meaning they possess both chordal and spanwise curvature. Due to aerodynamic requirements, the angle of attack at the wingtip is smaller than that at the wing root, resulting in a torsional shape for the wing panel as a whole. It can be said that almost all complex hyperboloid wing panels exhibit some degree of torsion; the torsional shape is a comprehensive manifestation of the simultaneous action of chordal and spanwise curvature in the wing panel. Currently, for stiffened paneling, since the overall structure is a rigid combination of web and stiffeners, the chordal shape can be obtained through web shot peening, and the spanwise shape can be obtained through stiffener shot peening. These two processes are performed independently, so stiffener shot peening has little impact on web shot peening. When the spanwise shape of all stiffeners meets the requirements, the panel simultaneously possesses both chordal and spanwise hyperbolic shapes, thus achieving the desired torsional shape. However, for unstiffened paneling, which is a single web structure, both chordal and spanwise shapes must be obtained through web shot peening. The current method involves first performing chordal shot peening on the outer surface of the web, and then performing spanwise shot peening on the inner surface. Since the torsional shape of the panel is most intense at the upper and lower edges, spanwise shot peening is only performed on the thickened strip areas at the upper and lower edges. The spanwise deformation at the upper and lower edges drives the overall spanwise deformation of the panel. Finally, based on the forming principle of the torsional shape of stiffened paneling, shot peening is performed at the axis of the stringers on the inner surface of the panel for correction, until the panel shape meets the requirements under load. While the aforementioned methods can produce a certain torsional shape in the panel, the limited spanner peening area on the inner surface (only the upper and lower edges) is insufficient to induce the required spanner deformation across the entire panel, resulting in an inadequate torsional shape. After shot peening, only extreme loading within the required range is necessary. Although this meets the requirements, significant stress exists during panel assembly, leading to poor assembly coordination and frequent rework. Furthermore, correcting the inner surface of the panel inevitably counteracts the chordal shape already achieved by shot peening the outer surface, sometimes even resulting in reverse chordal shaping. This necessitates re-correcting the chordal shape on the outer surface, followed by correcting the spanner shape on the inner surface, gradually approaching the final shape. However, this repeated correction process easily leads to excessive material stretching and instability in the panel, causing irreversible consequences. Therefore, a novel and efficient torsional shape shot peening method is urgently needed to address the technical challenges and risks associated with current torsional shape forming of unribbed panels, and to further improve shot peening technology. Summary of the Invention

[0003] Purpose of the invention: To solve the problem of shot peening forming of unribbed wing panels with torsional shapes, this invention provides a method for shot peening forming of unribbed wing panels with torsional shapes. By performing chordal shot peening on the outer surface of the torsional region under spanwise pre-bending and spanwise shot peening on the thickened strip areas at the upper and lower edges of the inner surface, the panel obtains the required chordal shape and preliminary spanwise shape, i.e., a preliminary torsional shape. Then, the panel is pre-bent and clamped in a torsional shape to induce torsional deformation, i.e., torsional deformation induction force. Finally, the inner and outer surfaces of the torsional region are shot-peened at equal pressure, so that the inner surface material of the panel extends spanwise while the chordal shape remains unchanged, thus obtaining the required spanwise shape. Finally, the panel obtains a chordal and spanwise hyperbolic shape, i.e., the required torsional shape is formed. Summary of the Invention:

[0005] A method for shot peening to form the torsional shape of a ribless airfoil panel includes the following steps:

[0006] Step 1: Perform spanwise pre-bending and clamping on the torsion shape region;

[0007] Step 2: Perform tangential shot peening on the outer surface of the torsion shape area;

[0008] Step 3: Perform spanwise shot peening on the surface within the torsional region;

[0009] Step 4: Perform torsion pre-bending and clamping on the torsion-shaped area;

[0010] Step 5: Apply equal pressure spraying to the inner and outer surfaces within the torsion shape area.

[0011] Furthermore, in step one, to improve the spanwise deformation capability of the wall panel and suppress the "spherical deformation" effect during tangential shot peening, the wall panel is pre-bent and clamped in the spanwise direction. The clamping process is as follows:

[0012] One load-bearing column is set at each of the left and right boundaries of the torsion area on the inner surface of the wall panel, and one force-applying column is set at each of the load-bearing columns 400mm away from the left and right boundaries on the outer surface, forming a "four-point" pre-bending clamping, so that the torsion shape area of ​​the wall panel can obtain uniform pre-deformation; the wall panel is simultaneously pre-bent in the longitudinal direction by the two force-applying columns on the outer surface, so that the wall panel bends towards the inner surface; furthermore, the longitudinal curvature of each point on the force-applying column during pre-bending is twice the curvature.

[0013] Furthermore, in step two, in order to obtain the required chordal shape on the outer surface of the panel, chordal shot peening is performed on the outer surface. The starting point of the shot peening path is the lower right corner of the part, the starting direction is horizontal to the right and then bends upward, and then the shot peening is performed in a rotating manner along the direction of maximum curvature or minimum curvature. The shot peening path rotates after exceeding the boundary L1 of the part. The value of L1 is in the range of 150mm to 200mm. The distance between the two shot peening paths is D. The value of D is in the range of 80mm to 120mm.

[0014] Furthermore, in step three, in order to achieve the required spanwise deformation in the twisted shape area of ​​the wall panel and to initially form the twisted shape, while reducing the impact on the already formed chordal shape, the wall panel is subjected to spanwise shot peening. During shot peening, only the thickened strip area near the upper and lower edges of the inner surface of the twisted shape area of ​​the wall panel is shot peened, and the width of the shot peening strip is L2; ​​the value of L2 ranges from 80mm to 100mm; the thickened strip area is an area with a thickness of not less than H, and the value of H ranges from ≥6mm.

[0015] Furthermore, in step four, to further achieve the desired torsional shape in the torsional area of ​​the wall panel, the wall panel is pre-bent and clamped to achieve the desired torsional shape. The clamping process is as follows:

[0016] One force-applying column is set on the inner and outer surfaces at the left boundary of the twisted shape area of ​​the wall panel; one force-applying screw is installed on the inner surface force-applying column corresponding to the upper edge of the wall panel, and one force-applying screw is installed on the outer surface force-applying column corresponding to the lower edge of the wall panel. The inner and outer surface screws apply force to the wall panel at the same time, so that the left boundary of the twisted area of ​​the wall panel tilts from right to left, and the tilt angle is the same as the twist angle of the wall panel.

[0017] At a point 400mm inward from the right boundary of the twisted area of ​​the wall panel, a force-applying column is installed on both the inner and outer surfaces. One force-applying screw is installed on the inner surface force-applying column corresponding to the lower edge of the wall panel, and one force-applying screw is installed on the outer surface force-applying column corresponding to the upper edge of the wall panel. The screws on both the inner and outer surfaces apply force to the wall panel simultaneously, causing the right boundary of the twisted area of ​​the wall panel to tilt from left to right, with the tilt angle being the same as the twist angle of the wall panel.

[0018] Furthermore, the position of the force-applying screw is as follows:

[0019] At the left boundary, the force-applying screw on the inner surface force-applying column contacts the thickened area at the upper edge of the inner surface of the wall panel, i.e., 30mm to 40mm from the upper edge. At the right boundary, the force-applying screw on the inner surface force-applying column contacts the corresponding outer surface of the thickened area at the lower edge of the wall panel, i.e., 20mm to 30mm from the lower edge.

[0020] Furthermore, in step five, in order to fully extend the material of the inner and outer surfaces within the twisted shape area of ​​the wall panel, obtain the required torsional deformation, and reduce the impact on the already formed chordal shape, the inner and outer surfaces within the twisted shape area are subjected to equal pressure shot blasting. During shot blasting, 3 to 5 shot blasting strips are selected; the length direction of the shot blasting strips is the same as the chordal curvature direction; the width of the shot blasting strips is 80 mm to 100 mm; and the strip spacing is 80 mm to 120 mm.

[0021] Furthermore, the parameters for equal pressure jetting are as follows:

[0022] Shot peening medium and size: φ3.18mm~φ4.8mm carburizing steel shot; shot peening pressure: 0.25Mpa~0.30Mpa; shot peening flow rate: 8kg / min~12kg / min; shot peening distance: 400mm~500mm; shot peening speed: 4m / min~6m / min.

[0023] The beneficial effects of this application are as follows:

[0024] A torsional shape shot peening method is provided for unribbed wing panels. This method involves sequentially performing chordal shot peening on the outer surface of the torsional region and spanwise shot peening on the thickened strip areas at the upper and lower edges of the inner surface under a spanwise pre-bent state. This gives the panel the desired chordal and preliminary spanwise shapes, i.e., a preliminary torsional shape. The panel is then pre-bent and clamped to induce torsional deformation. Finally, the outer and inner surfaces within the torsional region are shot-peened at equal pressure. Under the influence of the torsional deformation induction force, the panel maintains the chordal shape of the outer surface while the inner surface material extends along the spanwise direction, promoting spanwise deformation. Ultimately, the panel achieves a chordal and spanwise hyperboloid shape that meets design requirements, i.e., the desired torsional shape. This method effectively solves the problems of insufficient torsional shape and high assembly stress in unribbed wing panel shot peening, while also avoiding the risk of instability during panel shaping. Attached Figure Description

[0025] Figure 1 Schematic diagram of spanwise pre-bending clamping of the torsion shape region;

[0026] Figure 2 Schematic diagram of chordal shot peening forming of the outer surface of the torsion shape region;

[0027] Figure 3 Schematic diagram of surface spanning shot peening within a torsional region;

[0028] Figure 4 Schematic diagram of torsion pre-bending clamping;

[0029] Figure 5 Schematic diagram of surface spraying within the twisted area;

[0030] The numbers in the diagram are explained as follows: 1. Diagonal bearing column; 2. Straight bearing column; 3. Straight force-applying column; 4. Diagonal force-applying column; 5. Chordal path; 6. Lower edge thickened strip area; 7. Upper edge thickened strip area; 8. Force-applying screw; 9. Spraying strip area. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0032] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] A method for shot peening to form the torsional shape of a ribless airfoil panel includes the following steps:

[0034] Step 1: Perform spanwise pre-bending and clamping on the torsional region:

[0035] Because the twisted area of ​​the wall panel is saddle-shaped, meaning it bends longitudinally toward the inner surface and chordally toward the outer surface, during clamping, firstly, one load-bearing column is set at each of the left and right boundaries of the twisted area on the inner surface of the wall panel. Then, one force-applying column is set at each of the load-bearing columns 400mm away from the left and right boundaries on the outer surface, forming a "four-point" pre-bending clamping, so that the twisted area can obtain the required pre-bending amount. Finally, the wall panel is simultaneously pre-bent longitudinally through the two force-applying columns on the outer surface, so that the wall panel bends toward the inner surface. The pre-bending amount at the force-applying columns during pre-bending, i.e., the longitudinal curvature, is twice the required amount.

[0036] Step 2: Perform tangential shot peening on the outer surface of the torsion shape region.

[0037] In the spanwise pre-bending state, the outer surface of the torsional shape area of ​​the wall panel is shot-peened in the chord direction to obtain the required chord shape and suppress the spherical deformation of the shot-peened surface. That is, the spanwise reverse deformation of the wall panel is suppressed during chord-shaped forming. At the same time, in order to make the deformation of the wall panel in the chord direction consistent with the torsional deformation trend, the shot peening is carried out along the chord curvature distribution direction of the wall panel, that is, along the chord path.

[0038] The shot peening path starts at the lower right corner of the part, initially moving horizontally to the right and then bending upwards. It then rotates and peens along the direction of maximum or minimum curvature. The shot peening path rotates after exceeding the part boundary by a distance L1. The value of L1 ranges from 150mm to 200mm. The distance between the two shot peening paths is D. The value of D ranges from 80mm to 120mm.

[0039] Step 3: Perform spanwise shot peening on the surface within the torsional region.

[0040] The inner surface of the wall panel is shot peened in the spanwise pre-bending state. Since the torsional shape of the wall panel is most severe at the upper and lower edges, and the spanwise shape at the upper and lower edges has no effect on the overall chordal shape of the wall panel, the shot peening is only performed on the thickened strip area near the upper and lower edges of the inner surface of the torsional shape area of ​​the wall panel. The width of the shot peening strip is L2; ​​the value of L2 ranges from 80mm to 100mm. Before shot peening, the adjacent areas of the shot peening strip are protected. After shot peening, the wall panel initially obtains the spanwise shape while the overall chordal shape remains unchanged, that is, the torsional shape of the wall panel is initially formed.

[0041] Step 4: Perform torsion pre-bending clamping on the torsion shape region:

[0042] One force-applying column is installed on both the inner and outer surfaces at the left boundary of the twisted shape area of ​​the wall panel. A force-applying screw is installed on the inner surface force-applying column at the thickened area at the upper edge of the wall panel, 30mm–40mm from the upper edge. Another force-applying screw is installed on the outer surface force-applying column at the thickened area at the lower edge of the wall panel, 20mm–30mm from the lower edge. The inner and outer surface screws simultaneously apply force to the wall panel, causing the left boundary of the twisted area to tilt from right to left at the same angle as the twist angle. Similarly, on the right boundary of the twisted shape area of ​​the wall panel, one force-applying column is installed on both the inner and outer surfaces. Each panel is equipped with one force-applying column. One force-applying screw is installed on the inner surface force-applying column at the thickened area at the lower edge of the wall panel, with the screw 20mm to 30mm from the lower edge. One force-applying screw is installed on the outer surface force-applying column at the thickened area at the upper edge of the wall panel, with the screw 30mm to 40mm from the upper edge. The inner and outer surface screws apply force to the wall panel simultaneously, causing the right boundary of the torsion area of ​​the wall panel to tilt from left to right at the same angle as the torsion angle of the wall panel. At this time, the tilt directions of the left and right boundaries of the wall panel are opposite, so that the wall panel as a whole has a torsion shape and the torsion angle is twice the required value.

[0043] Step 5: Perform equal-pressure spraying on the inner and outer surfaces within the torsional shape area.

[0044] In the torsional pre-bending clamping state, the inner and outer surfaces of the torsional area are shot-blasted together with 3 to 5 shot-blasting strips, with a strip spacing of 80 mm to 120 mm. The direction of the shot-blasting strips is consistent with the chordal curvature direction. Since the wall panel already has a chordal shape during shot blasting, if the shot blasting parameters of the inner and outer surfaces are inconsistent, i.e., there is a shot blasting pressure difference, the chordal curvature of the wall panel will inevitably change after shot blasting. At the same time, according to the forming principle of the torsional shape of the ribbed wall panel, the inner surface material must be extended along the spanning direction while the chordal curvature of the outer surface remains unchanged during forming. Therefore, the inner and outer surfaces are shot-blasted with an equal pressure difference during torsional shape forming. Under the action of the torsional deformation induction force, the chordal shape of the outer surface remains unchanged, while the inner surface material is extended along the spanning direction to promote spanning deformation. Finally, the wall panel has a chordal spanning hyperbolic shape that meets the design requirements, i.e., the required torsional shape is formed.

[0045] Example

[0046] like Figure 1-5 As shown, the following uses a typical torsion area of ​​an aircraft wing panel without stiffeners as an example to illustrate the specific implementation of the present invention.

[0047] 1. Perform longitudinal pre-bending clamping on the torsional shape area of ​​the wall panel. Since the torsional shape area of ​​the unreinforced wall panel is usually "saddle" shaped, that is, the longitudinal direction bends towards the inner surface and the chord direction bends towards the outer surface, during clamping, first set one diagonal bearing column 1 and one straight bearing column 2 at the left and right boundaries of the torsional shape area on the inner surface of the wall panel, respectively. Then, set one diagonal bearing column 4 400mm away from the left boundary on the outer surface and one straight bearing column 3 400mm away from the right boundary on the outer surface. Finally, the wall panel is pre-bent longitudinally by the straight bearing column 3 and the diagonal bearing column 4 on the outer surface, so that the wall panel bends towards the inner surface. The pre-bending amount at the straight bearing column 3 and the diagonal bearing column 4 during pre-bending, that is, the longitudinal curvature, is twice the design requirement to ensure that the deformation of the wall panel is within the elastic range.

[0048] 2. Perform chordal shot peening on the outer surface of the torsional shape area of ​​the wall panel. Perform chordal shot peening on the outer surface of the torsional shape area of ​​the wall panel under a pre-bent state in the spanwise direction to obtain the desired chordal shape and suppress spherical deformation during shot peening. That is, suppress reverse deformation of the wall panel in the spanwise direction during chordal forming. Simultaneously, to ensure that the deformation in the chordal direction of the wall panel is consistent with the torsional deformation trend, shot peening is performed along the chordal curvature distribution direction of the wall panel, i.e., along chordal path 5.

[0049] 3. Perform spanning shot peening on the surface within the torsional shape area. The inner surface is shot peened in the spanning pre-bent state. Since the torsional shape of the panel is most severe at the upper and lower edges, and the spanning shape at the upper and lower edges has no effect on the overall chordal shape of the panel, only the thickened strip area 6 at the lower edge and the thickened strip area 7 at the upper edge of the surface within the torsional area are shot peened. The shot peening strip width is 80mm. Adjacent areas to the shot peening strip are protected during shot peening. After shot peening, the panel initially obtains its spanning shape while maintaining its overall chordal shape, thus initially forming the torsional shape of the panel.

[0050] 4. Perform torsion pre-bending clamping on the torsion shape area. At the left boundary of the twisted shape area of ​​the wall panel, one inclined force-applying column 4 is installed on both the inner and outer surfaces. One force-applying screw 8 is installed on the inner surface inclined force-applying column 4 corresponding to the upper edge of the wall panel, and another force-applying screw 8 is installed on the outer surface inclined force-applying column 4 corresponding to the lower edge of the wall panel. The inner and outer surface force-applying screws 7 simultaneously apply force to the wall panel, causing the left boundary of the twisted area to tilt from right to left at the same angle as the twist angle of the wall panel. Similarly, at the right boundary of the twisted shape area of ​​the wall panel, one straight force-applying column 3 is installed on both the inner and outer surfaces. One force-applying screw 8 is installed on the inner surface straight force-applying column 3 corresponding to the lower edge of the wall panel, and another force-applying screw 8 is installed on the outer surface straight force-applying column 3 corresponding to the upper edge of the wall panel. The inner and outer surface force-applying screws 8 simultaneously apply force to the wall panel, causing the right boundary of the twisted area to tilt from left to right at the same angle as the twist angle of the wall panel. At this point, the tilt directions of the left and right boundaries of the wall panel are opposite, resulting in an overall twisted shape for the wall panel with a twist angle twice the required value.

[0051] 5. Perform equal-pressure shot blasting on the inner and outer surfaces within the torsional shape area. While the panel is in a pre-bent clamped state, perform shot blasting on the inner and outer surfaces within the torsional shape area. Select 3 out of 9 shot blasting strips with a strip spacing of 120mm. The direction of the 9 shot blasting strips should be consistent with the chordal curvature direction. Since the panel already has a chordal shape during shot blasting, if the shot blasting parameters of the inner and outer surfaces are inconsistent, i.e., there is a shot blasting pressure difference, the chordal curvature of the panel will inevitably change after shot blasting. Simultaneously, according to the forming principle of torsional shape of ribbed panels, the inner surface material must be stretched along the spanning direction while maintaining the chordal curvature of the outer surface during forming. Therefore, equal pressure is used on the inner and outer surfaces during shot blasting of the torsional shape area. This ensures that the chordal shape of the outer surface remains unchanged under the action of the torsional deformation induced force, while simultaneously promoting spanning deformation by stretching the inner surface material along the spanning direction. Ultimately, this results in the panel having a chordal-spanning hyperbolic shape that meets the design requirements, i.e., forming the desired torsional shape.

[0052] Through the implementation of the above steps, the problems of insufficient torsional shape, high assembly stress, and easy instability during the shot peening forming of unribbed wing panels have been successfully solved. This has achieved a breakthrough in torsional shape shot peening forming technology, filled the technical gap in conventional shot peening for torsional shape forming of unribbed wing panels, and greatly improved the level of shot peening forming technology.

[0053] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present invention is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0054] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of the present invention, can make many other forms without departing from the spirit and scope of protection of the claims, and all such forms are within the protection scope of the present invention.

Claims

1. A method for shot peening to form the torsional shape of a ribless airfoil panel, characterized in that: Includes the following steps: Step 1: Perform spanwise pre-bending and clamping on the torsion region, as follows: One load-bearing column is set at the left and right boundaries of the torsion area on the inner surface of the wall panel, and one force-applying column is set at the outer surface 400mm away from the load-bearing columns at the left and right boundaries, forming a "four-point" pre-bending clamp; the wall panel is simultaneously pre-bent in the longitudinal direction by the two force-applying columns on the outer surface, so that the wall panel bends towards the inner surface. Step 2: Perform tangential shot peening on the outer surface of the torsion shape area; Step 3: Perform spanning shot peening on the surface within the twisted shape area. During spanning shot peening deformation, only the thickened strip area near the upper and lower edges of the surface within the twisted shape area of ​​the wall panel is shot peened. Step 4: Perform torsion pre-bending and clamping on the torsion-shaped area, as follows: One force-applying column is set on the inner and outer surfaces at the left boundary of the twisted shape area of ​​the wall panel; one force-applying screw is installed on the inner surface force-applying column corresponding to the upper edge of the wall panel, and one force-applying screw is installed on the outer surface force-applying column corresponding to the lower edge of the wall panel. The inner and outer surface screws apply force to the wall panel at the same time, so that the left boundary of the twisted area of ​​the wall panel tilts from right to left, and the tilt angle is the same as the twist angle of the wall panel. A force-applying column is installed on both the inner and outer surfaces at a point 400mm inward from the right boundary of the twisted shape area of ​​the wall panel. One force-applying screw is installed on the inner surface force-applying column corresponding to the lower edge of the wall panel, and one force-applying screw is installed on the outer surface force-applying column corresponding to the upper edge of the wall panel. The screws on both the inner and outer surfaces apply force to the wall panel simultaneously, causing the right boundary of the twisted area of ​​the wall panel to tilt from left to right, with the tilt angle being the same as the twist angle of the wall panel. Step 5: Apply equal pressure spraying to the inner and outer surfaces within the torsion shape area.

2. The method according to claim 1, characterized in that: During pre-bending, the spanwise curvature of each point on the column under force is twice the curvature.

3. The method according to claim 2, characterized in that: In step two, the starting point of the shot peening path is the lower right corner of the part. The starting direction is horizontal to the right and then bends upward. After that, the shot peening is performed in a rotating manner along the direction of maximum curvature or minimum curvature. The shot peening path rotates after exceeding the boundary L1 of the part. The value of L1 is in the range of 150mm to 200mm. The distance between the two shot peening paths is D. The value of D is in the range of 80mm to 120mm.

4. The method according to claim 3, characterized in that: In step three, the width of the shot peening strip is L2; ​​the value of L2 ranges from 80mm to 100mm; the thickened strip area is the area with a thickness of not less than H, and the value of H ranges from ≥6mm.

5. The method according to claim 4, characterized in that: The position of the force-applying screw is as follows: At the left boundary, the force-applying screw on the inner surface force-applying column contacts the thickened area at the upper edge of the inner surface of the wall panel, 30mm~40mm from the upper edge. The force-applying screw on the outer surface force-applying column contacts the corresponding outer surface of the thickened area at the lower edge of the wall panel, 20mm~30mm from the lower edge. At the right boundary, the force-applying screw on the inner surface force-applying column contacts the thickened area at the lower edge of the inner surface of the wall panel, 20mm~30mm from the lower edge. The force-applying screw on the outer surface force-applying column contacts the corresponding outer surface of the thickened area at the upper edge of the wall panel, 30mm~40mm from the upper edge.

6. The method according to claim 5, characterized in that: In step five, when applying equal pressure for shot peening, select 3 to 5 shot peening strips; the length direction of the shot peening strips should be the same as the chordal curvature direction; the width of the shot peening strips should be 80 mm to 100 mm; and the strip spacing should be 80 mm to 120 mm.

7. The method according to claim 6, characterized in that: The parameters for constant pressure jet spraying are as follows: Shot peening medium and size: φ3.18mm~φ4.8mm carburizing steel shot; shot peening pressure: 0.25Mpa~0.30Mpa; shot peening flow rate: 8kg / min~12kg / min; shot peening distance: 400mm~500mm; shot peening speed: 4m / min~6m / min.

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