A high-rigidity hollow sandwich structure and manufacturing method

Abstract

The present invention belongs to the field of advanced structural design and manufacturing technology, and specifically relates to a high-rigidity hollow sandwich structure and a manufacturing method. The method first analyzes the stress and deformation of the hollow sandwich structure to determine the maximum deformation point and the fixed constraint end. Based on these points, the curve profile of the rib is designed so that the wave crest is close to or passes through the maximum deformation point, and the wave trough is close to the fixed constraint end. Then, an isolation agent is applied to the area outside the curve profile of the rib. After that, the thin plate blank and the solid blank are stacked in sequence, placed in a high-temperature environment, and isostatic pressure is applied to perform diffusion connection to make the blanks become one. Finally, an inert gas is introduced at high temperature, and superplastic forming technology is used to complete the manufacture of the high-rigidity hollow sandwich structure. Through this "S-shaped" or "zigzag" rib design, the structural rigidity is improved while ensuring the accessibility of the process.

Description

Technical Field

[0001] The present invention belongs to the field of advanced structural design and manufacturing technology, and in particular relates to a high-rigidity hollow sandwich structure and a manufacturing method. Background Art

[0002] In modern aerospace, with increasing demands for aircraft performance, particularly the need to optimize both weight and structural strength, traditional metal structure manufacturing technologies have gradually demonstrated their limitations. During the manufacturing process, particularly in the connection and integration of metal structures, conventional welding techniques can introduce structural defects such as low melting points and large heat-affected zones. These defects can not only reduce structural strength but also increase the overall weight of the structure.

[0003] The combined application of superplastic forming and diffusion bonding technologies offers an effective solution to these challenges. Superplastic forming can achieve exceptional ductility under specific temperature and strain rate conditions, enabling the precise forming of complex shapes. Diffusion bonding, on the other hand, achieves a seamless bond between metal materials through atomic-level interdiffusion, avoiding the potential defects associated with traditional welding. This combined technology not only enables near-net ...

[0004] However, when applying this technology to hollow sandwich structures, such as low-aspect-ratio wings, designers face a major challenge: how to increase the stiffness and strength of the structure without adding excessive weight. Traditional reinforcement methods, such as cross-shaped and straight-shaped reinforcements, can increase structural stiffness to a certain extent, but there is still room for improvement. In particular, straight-shaped reinforcements, while simple in structure and easy to implement, often fail to meet high-performance stiffness requirements. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] The present invention mainly addresses the above problems and proposes a high-rigidity hollow sandwich structure and a manufacturing method, the purpose of which is to solve the problems of high structural weight and manufacturing difficulty in the aerospace field, while improving structural rigidity and durability.

[0007] (2) Technical solution

[0008] To achieve the above object, the present invention provides a first aspect of a method for manufacturing a high-rigidity hollow sandwich structure, comprising the following steps:

[0009] Analyze the stress and deformation forms of the hollow sandwich structure and determine the maximum deformation point and fixed constraint end of the hollow sandwich structure;

[0010] Based on the maximum deformation point and the fixed constraint end, wavy reinforcement bars are used instead of traditional "cross" and "well" shaped reinforcement bars, eliminating the manufacturing difficulties such as severe local thinning and cracking during the forming process of the reinforcement intersection. The curve profile of the wavy reinforcement bar is designed so that the crest of the rib curve profile is close to or passes through the maximum deformation point, and the trough is close to or passes through the fixed constraint end. While taking into account the load-bearing performance in two directions, the intersection is eliminated and the manufacturing process is reduced.

[0011] According to the design result, a region to be coated with a release agent for forming the rib is obtained, wherein the region to be coated with the release agent is located outside the curved contour of the designed rib;

[0012] The thin plates and blanks required for manufacturing the high-rigidity hollow sandwich structure are stacked in sequence, and the release agent is applied to the area to be coated with the release agent;

[0013] The laid-up multiple sheet blanks and multiple solid blanks are placed in a high temperature environment, and isostatic pressing is applied to the blanks to perform diffusion bonding, so that the blanks become one;

[0014] Subsequently, an inert gas is introduced into the workpiece under a high temperature environment, and the ribs are obtained by superplastic forming to manufacture a high-rigidity hollow sandwich structure.

[0015] Furthermore, the steps of stacking the thin plates and blanks required for manufacturing high-rigidity hollow sandwich structures in sequence and coating the isolation agent in the area to be coated with the isolation agent include: stacking multiple thin plate blanks and multiple solid blanks in the order of: first thin plate blank, first solid blank, second thin plate blank, third thin plate blank, second solid blank, and fourth thin plate blank; during the stacking process, coating the isolation agent on a specific area on the surface of any one thin plate blank selected from the second thin plate blank or the third thin plate blank, wherein the surface of any one thin plate blank is the relative surface between the second thin plate blank or the third thin plate blank, and the specific area of ​​the surface is the area to be coated with the isolation agent.

[0016] Furthermore, the subsequent step of introducing an inert gas in a high-temperature environment includes introducing an inert gas into the region to be coated with the release agent between the second thin plate blank and the third thin plate blank.

[0017] Furthermore, the curved profile of the rib is a sinusoidal function curve, a continuous corrugated smooth curve or a broken line.

[0018] Furthermore, the starting point and the end point of the sinusoidal function curve, the continuous corrugated smooth curve or the broken line are located at the leading edge and the trailing edge of the high-rigidity hollow sandwich structure.

[0019] Furthermore, if there is a local area with large deformation in the high-rigidity hollow sandwich structure, incomplete reinforcement ribs are added in the local area with large deformation.

[0020] Furthermore, the first solid blank and the second solid blank form a solid area; when there are two or more solid areas bearing concentrated loads and the spacing between the solid areas is equal, the reinforcement rib peaks between the solid areas are spaced apart by one cycle or an integer multiple of the cycle.

[0021] Furthermore, the first solid blank and the second solid blank form solid areas. When there are two or more solid areas bearing concentrated loads and the spacing between the solid areas is unequal, the peak intervals of the reinforcing ribs between the solid areas change periodically, and the reinforcing ribs change smoothly.

[0022] Furthermore, the strength and rigidity of the designed structure were verified through the finite element analysis model, and the design scheme was iteratively optimized based on the numerical calculation results.

[0023] Furthermore, it also includes determining the shape and thickness of the rib cross section so that its height is connected to the upper and lower skins.

[0024] Furthermore, the shape of the cross section of the rib includes a rectangular cross section, an I-shaped cross section, a T-shaped cross section or an L-shaped cross section.

[0025] To achieve the above-mentioned object, a second aspect of the present invention provides a high-rigidity hollow sandwich structure manufactured by the above-mentioned manufacturing method.

[0026] (3) Beneficial effects

[0027] Compared to existing technologies, the present invention provides a high-rigidity hollow sandwich structure and manufacturing method that solves the problems of structural weight and manufacturing difficulty in the aerospace field, while significantly improving the rigidity and durability of the structure. By analyzing the stress and deformation patterns of the hollow sandwich structure, the present invention identifies the maximum deformation point and fixed constraint end of the hollow sandwich. Based on the maximum deformation point and fixed constraint end, the ribs are designed so that the crest of the rib waveform approaches or passes through the maximum deformation point, and the trough approaches or passes through the fixed constraint end, thereby enhancing the rigidity and durability of the structure without significantly increasing its weight. This rib design optimizes the stress distribution of the structure, making it more suitable for withstanding the complex loads encountered during actual flight, thereby optimizing the stress distribution and enhancing the overall structure's ability to resist deformation.

[0028] By applying isostatic pressing at high temperature and in an inert gas environment, the precise formation of the ribs and the one-shot molding of the overall structure are ensured. This method improves manufacturing efficiency, reduces manufacturing difficulty, and achieves better structural performance, solving weight and strength optimization issues that traditional technologies cannot overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a top-view projection outline disclosed in this application.

[0030] Figure 2 This is a schematic diagram of a structure disclosed in this application in which there is a region with large local deformation.

[0031] Figure 3 This is a schematic diagram of a structure in which the main reinforcement rib is designed in a zigzag shape disclosed in this application.

[0032] Figure 4 This is a structural schematic diagram of a paving thin plate blank and a local reinforcement structure disclosed in this application.

[0033] Figure 5 This is a schematic diagram of the structure after diffusion disclosed in this application.

[0034] Figure 6 This is a schematic diagram of a hollow sandwich structure with high rigidity that is finally formed into a shape disclosed in this application.

[0035] The reference numerals shown in the figure are: 1. Projection profile; 2. Constraint position; 3. Maximum position of warping deformation; 4. Area of ​​large local deformation; 5. First thin plate blank; 6. First solid blank; 7. Second thin plate blank; 8. Third thin plate blank; 9. Second solid blank; 10. Fourth thin plate blank; 11. Blank area. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below with reference to the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The invention proposes a method for manufacturing a high-rigidity hollow sandwich structure. Its innovation lies in combining longitudinal and transverse reinforcement elements with curved ribs. This method enhances structural rigidity and achieves a lightweight design while taking into account process accessibility. The manufacturing method is as follows:

[0040] Step S1: Analyze the stress and deformation forms of the hollow sandwich structure, and determine the maximum deformation point and fixed constraint end of the hollow sandwich structure.

[0041] A detailed analysis of the various external forces and resulting deformations to which the designed structure is subjected in actual use is performed. In this embodiment, the force distribution and deformation characteristics of a low-aspect-ratio wing under the influence of aerodynamic forces (such as lift) need to be determined. Specifically, it is necessary to understand the overall warping of the wing when subjected to a certain vertical pressure and identify the location of maximum deformation. This provides a basis for subsequent rib design, ensuring that the structure meets strength requirements while maintaining good rigidity and weight reduction.

[0042] Step S2: Design the curve profile of the rib according to the maximum deformation point and the fixed constraint end, so that the crest of the rib curve profile approaches or passes through the maximum deformation point, and the trough approaches or passes through the fixed constraint end.

[0043] When designing stiffeners, the direction of the ribs should be determined based on the deformation characteristics of the structure after being subjected to stress. Specifically, through analysis, the locations on the structure with the greatest stress and the most significant deformation can be determined. During design, the crests and troughs of the ribs are placed close to these key locations to optimize the stress distribution of the structure and enhance its ability to resist deformation. This design takes into account that when the structure is loaded, the material at the point of maximum deformation will experience the greatest tensile or compressive stress. Therefore, adding crests to the ribs in these areas can provide additional support and enhance local stiffness, thereby resisting structural failure caused by excessive deformation. At the same time, placing the trough near the fixed constraint end can effectively transfer the load to the supporting structure and enhance the stability of the connection.

[0044] like Figure 1 As shown, the left figure is the projection profile of the overall structure, and the right figure is a cross-sectional view of its internal structure. In the cross-sectional view on the right, the crest of the projection profile 1 is close to or passes through the maximum warping deformation position 3; the trough is close to or passes through the fixed constraint end 2.

[0045] Step S3: obtaining a region to be coated with a release agent for forming the rib according to the design result, wherein the region to be coated with the release agent is located outside the curved contour of the designed rib.

[0046] During the manufacturing process of high-rigidity hollow sandwich structures, after the shape and position of the ribs are designed, areas requiring a release agent coating are determined. The release agent prevents these areas from undesirable bonding or reactions with other materials during the manufacturing process. The "release agent-coated areas" are areas outside the rib's curved contours. These areas are coated with release agent as required to ensure the ribs maintain their designed shape and function during manufacturing without interference from surrounding materials.

[0047] Step S4: stacking the thin plate blanks and solid blanks required for manufacturing the high-rigidity hollow sandwich structure in sequence, and applying a release agent to the area to be coated with the release agent;

[0048] The operator first needs to stack the sheet metal blanks and solid blanks in a predetermined order. These sheet metal blanks and solid blanks will form the basic materials of the final structure. During the stacking process, specific areas, previously defined as the "release agent application area" in the design, are coated with release agent.

[0049] Step S5: placing the laid-up plurality of thin plate blanks and the plurality of solid blanks in a high-temperature environment, applying isostatic pressing to the blanks to perform diffusion bonding, so that the blanks become one;

[0050] In this step, multiple sheet blanks and solid blanks, stacked sequentially and coated with a release agent in specific areas, are placed in a high-temperature environment. This high temperature is designed to cultivate the material properties suitable for diffusion bonding, allowing atoms between the materials to diffuse across the contact surface and achieve bonding. Simultaneously, isostatic pressing—the application of uniform pressure in all directions—is applied to the stacked materials. This helps ensure close contact and uniform bonding between the materials, further promoting the diffusion bonding effect.

[0051] Step S6: Then, inert gas is introduced into the workpiece under a high temperature environment to obtain the ribs by superplastic forming, thereby manufacturing a high-rigidity hollow sandwich structure.

[0052] Further forming is performed within the already prefabricated structure by diffusion bonding. While maintaining a high temperature environment, an inert gas, such as argon or nitrogen, is introduced into the inner sheet blank, causing it to expand under the high temperature. Due to the gas pressure, the inner sheet blank begins to deform, ultimately achieving the desired hollow sandwich effect under the high temperature, thereby increasing the rigidity and stability of the entire structure.

[0053] The rib design of this invention takes into account structural stress and deformation, optimizing rib layout through curved profiles to more effectively enhance structural rigidity and durability while simultaneously controlling weight. The application of isostatic pressing at high temperatures and an inert gas environment ensures precise rib formation and a single-shot molding of the entire structure. This method improves manufacturing efficiency, reduces manufacturing complexity, and achieves superior structural performance, resolving weight and strength optimization challenges that have been insurmountable with conventional technologies.

[0054] Preferably, the steps of stacking the sheet blanks and solid blanks required for manufacturing the high-rigidity hollow sandwich structure in sequence and coating the release agent in the area to be coated with the release agent include: arranging the layers of material in sequence according to the previously determined design scheme, such as Figure 4 As shown, the specific order is the first thin plate blank 5, the first solid blank 6, the second thin plate blank 7, the third thin plate blank 8, the second solid blank 9, and the fourth thin plate blank 10. During the stacking process, any thin plate blank is selected from the second thin plate blank 7 and the third thin plate blank 8 adjacent to each other, for example, the second thin plate blank 7, and then the release agent is applied to the surface of the second thin plate blank 7 facing the third thin plate blank 8. The position where the release agent is applied is the release agent to be applied area mentioned above. In other words, the position without the release agent is the position of the reinforcement rib to prevent these areas from being diffusely connected during the subsequent processing, and ultimately achieve the expected structure and function.

[0055] In step S6, the inert gas is introduced into the position as Figure 5 As shown, an inert gas, such as argon or nitrogen, is introduced into the blank area 11 between the second thin plate blank 7 and the third thin plate blank 8 to inflate the blank under high temperature. Due to the effect of the gas pressure, the second thin plate blank 7 and the third thin plate blank 8 will begin to deform (see FIG. Figure 6 ), and ultimately achieve the desired hollow sandwich effect in a high temperature environment.

[0056] In this embodiment, the "S-shaped rib" projection profile 1 is a sinusoidal function curve, with the starting and ending points located at the front and rear edges of the structure. If there is a local area with large deformation 4 in the structure, incomplete reinforcement ribs can be added in the local area to improve the structural rigidity, such as Figure 2 In addition, the main reinforcement ribs can also be designed as zigzag lines, such as Figure 3 as shown, or a continuous wavy smooth curve.

[0057] like Figure 2 、 Figure 3 As shown, the complete periodically changing reinforcement ribs can be one or more. If there is a local area 4 with large deformation in the high-rigidity hollow sandwich structure, incomplete reinforcement ribs can be added in the local area 4 with large deformation to improve the local rigidity of the structure.

[0058] Preferably, the thin plate blank is composed of four layers of thin plates and partial solid blanks, wherein the first thin plate blank 5 and the fourth thin plate blank 10 on the outside form the outer shape of the structure, the second thin plate blank 7 and the third thin plate blank 8 on the inside form a reinforcement structure, and the first solid blank 6 and the second solid blank 9 form a solid area; the solid area is used to bear concentrated loads, and the reinforcement varies between these solid areas.

[0059] When there are two or more solid areas bearing concentrated loads and the spacing between the solid areas is equal, the peak intervals of the reinforcing ribs between the solid areas are one cycle or an integer multiple of the cycle.

[0060] When there are two or more solid areas bearing concentrated loads and the spacing between the solid areas is not equal, the periodicity of the rib peak intervals between the solid areas can vary, but the rib changes must be smooth.

[0061] The ribs on both sides of the thin-walled structure should be located at the midpoint. The cross-sectional shape and thickness are determined based on the structural requirements. Options include, but are not limited to, rectangular, I-shaped, T-shaped, and L-shaped sections. The rib height should be consistent with the upper and lower surfaces of the thin-walled structure. Finally, a finite element analysis model is created based on the designed structural dimensions to analyze the strength and stiffness of the structure. The design solution is then iteratively optimized based on the numerical calculation results, ultimately finalizing the final design.

[0062] Preferably, before step S3, the process further includes determining the shape and thickness of the rib cross section so that the rib has a height that is connected to the upper and lower skins.

[0063] Preferably, the crests and troughs of the changing reinforcement ribs are close to the solid area, or are integrated with the solid area.

[0064] As a more optimal solution of this embodiment, the skin and the reinforcement are perpendicular to each other, and the reinforcement is distributed in the structure in the form of a sine function.

[0065] The present invention also proposes a high-rigidity hollow sandwich structure, which is composed of four layers of thin plate blanks and a local reinforcement structure. The outer thin plate blank is formed into a thin-walled skin of the structure, the inner two layers of film blanks are formed into an I-shaped reinforcement rib structure, and the local reinforcement structure is formed by the local solid blank between the inner and outer sides.

[0066] The present invention provides a method for manufacturing a high-rigidity hollow sandwich structure. This method combines longitudinal and transverse reinforcement elements using curved ribs, enhancing structural rigidity and achieving a lightweight design while maintaining process accessibility. Furthermore, this method is suitable for the design of aerospace structures such as low-aspect-ratio wings, enabling the development of a corresponding design solution based on specific design requirements. Furthermore, this method can provide a new design approach for engineering applications of hollow sandwich load-bearing structures, reducing structural weight and manufacturing costs, generating economic benefits.

[0067] The following is a specific example of a method for manufacturing a high-rigidity hollow sandwich structure provided by the present invention, which is applied to a low-aspect-ratio wing. The specific implementation method is as follows:

[0068] a) Analyze the stress and deformation of the structure. The design object in this example is an aluminum alloy wing with a small aspect ratio. Its top view projection is a rectangle, such as Figure 1 As shown, the size is 10m×2m (chord length is 10m, span is 2m, aspect ratio is 0.2), and the skin thickness is 1mm. There are three solid areas that bear concentrated loads on the entire wing, located at Figure 1 The number 1 is connected to the fuselage and transfers the load. The structure is affected by aerodynamic forces, and the main consideration in design is the lift force. Figure 1 For example, the wing surface is subjected to a pressure of 0.1 MPa in the outward direction perpendicular to the paper. The structural deformation is upward warping, and the maximum deformation point is at Figure 1 There are 3 places marked;

[0069] b) Design the top view projection shape of the "S-shaped reinforcement" according to the stress and deformation form of the structure. Considering the strength and stiffness of the structure, the reinforcement shape is like a sine curve, with its peaks and troughs passing through the fixed constraint end and the maximum deformation point respectively, such as Figure 1 As shown;

[0070] c) Design the cross-sectional shape of the ribs as needed. In this embodiment, the cross-sectional shape of the ribs is rectangular, the height is connected to the upper and lower skins, and the thickness is 0.8 mm;

[0071] d) Finite element modeling and calculation were performed on the design scheme. The numerical simulation results showed that the stiffness of the design scheme was greater than that of a "straight-shaped rib" structure with the same cross-sectional shape;

[0072] e) According to the structural form designed in the above steps, lay the thin plate blank and local reinforcement structure. Figure 4 As shown, the blanks after cleaning the surface are stacked together in the order of: a first thin plate blank, a first solid blank, a second thin plate blank, a third thin plate blank, a second solid blank, and a fourth thin plate blank. During the stacking process, a release agent is applied to a specific area on the surface of any one of the second thin plate blanks or the third thin plate blanks, wherein the surface of any one of the thin plate blanks is the surface facing each other of the second thin plate blanks or the third thin plate blanks, and the specific area on the surface is the area outside the top projection outline of the designed ribs, that is, the position without the release agent is the position of the reinforcing ribs;

[0073] f) If Figure 5As shown, the blank is placed in a high temperature environment, isostatic pressure is applied to the surface of the structure to achieve diffusion bonding, and then in the high temperature environment, inert gas is introduced between the inner and outer thin plate blanks and the inner thin plate blank in sequence;

[0074] g) finally formed into the required high rigidity hollow sandwich structure, such as Figure 6 shown.

[0075] Therefore, from any point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the application is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in this application. Any figure mark in the claims should not be regarded as limiting the claim involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim may also be implemented by the same unit or device through software or hardware. The words first, second, etc. are used to indicate names and do not indicate any particular order.

[0076] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for manufacturing a high-rigidity hollow sandwich structure, characterized in that: The following steps are involved: Analyze the stress and deformation forms of the hollow sandwich structure and determine the maximum deformation point and fixed constraint end of the hollow sandwich structure; According to the maximum deformation point and the fixed constraint end, the curve profile of the rib is designed so that the crest of the rib curve profile approaches or passes through the maximum deformation point, and the trough approaches or passes through the fixed constraint end; According to the design result, a region to be coated with a release agent for forming the rib is obtained, wherein the region to be coated with the release agent is located outside the curved contour of the designed rib; The thin plate blanks and solid blanks required for manufacturing the high-rigidity hollow sandwich structure are stacked in sequence, and the release agent is applied to the release agent coating area; The laid-up multiple sheet blanks and multiple solid blanks are placed in a high temperature environment, and isostatic pressing is applied to the blanks to perform diffusion bonding, so that the blanks become one; Subsequently, an inert gas is introduced into the workpiece under a high temperature environment, and the ribs are obtained by superplastic forming to manufacture a high-rigidity hollow sandwich structure.

2. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 1, characterized in that: The steps of stacking the thin plates and blanks required for manufacturing a high-rigidity hollow sandwich structure in sequence and coating the isolation agent in the area to be coated with the isolation agent include: stacking multiple thin plate blanks and multiple solid blanks in the order of: first thin plate blank, first solid blank, second thin plate blank, third thin plate blank, second solid blank, and fourth thin plate blank; during the stacking process, coating the isolation agent on a specific area on the surface of any one of the second thin plate blanks or the third thin plate blank, wherein the surface of any one of the thin plate blanks is the relative surface between the second thin plate blank and the third thin plate blank, and the specific area of ​​the surface is the area to be coated with the isolation agent.

3. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 2, characterized in that: The step of subsequently introducing an inert gas in a high-temperature environment includes introducing an inert gas into the region between the second thin plate blank and the third thin plate blank where the release agent is to be coated.

4. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 1, characterized in that: The curved profile of the rib is a sinusoidal function curve, a continuous corrugated smooth curve or a broken line.

5. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 4, characterized in that: The starting point and the end point of the sinusoidal function curve, the continuous corrugated smooth curve or the broken line are located at the leading edge and the trailing edge of the high-rigidity hollow sandwich structure.

6. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 1, characterized in that: If there are areas with large local deformation in the hollow sandwich structure, incomplete reinforcement ribs are added in the areas with large local deformation.

7. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 2, characterized in that: The first solid blank and the second solid blank form a solid area; when there are two or more solid areas bearing concentrated loads and the solid areas are equidistant, the reinforcing rib peaks between the solid areas are spaced apart by a period or an integer multiple of the period.

8. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 2, characterized in that: The first solid blank and the second solid blank form a solid area. When there are two or more solid areas bearing concentrated loads and the spacing between the solid areas is unequal, the peak intervals of the reinforcement ribs between the solid areas change periodically, and the reinforcement ribs change smoothly.

9. The method for manufacturing a high-rigidity hollow sandwich structure according to claim 1, characterized in that: The cross-section of the rib includes a rectangular cross-section, an I-shaped cross-section, a T-shaped cross-section or an L-shaped cross-section.

10. A high-rigidity hollow sandwich structure, characterized in that: The invention is manufactured by the manufacturing method according to any one of claims 1 to 9.

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