Composite wedge-shaped trailing edge part with curvature interlayer, forming tool and forming method

Abstract

The application belongs to the technical field of sandwich composite parts, and discloses a sandwich composite wedge-shaped trailing edge part with curvature, a forming tool and a forming method. The forming tool of the sandwich composite wedge-shaped trailing edge part with curvature comprises a laying main mold body, a positioning mold body and a deformation limiting module. The laying main mold body is used for positioning and supporting the lower skin forming of the arc-shaped layer. The positioning mold body is used for C-shaped layer laying, transfer and bonding. The laying main mold body and the positioning mold body cooperatively complete Z-shaped layer positioning and laying. The blocking strip of the deformation limiting module is arranged on the side edge of the Z-shaped layer and the positioning mold body to limit the deformation of the side surface of the part. The cover plate is arranged on the Z-shaped layer to limit the deformation of the upper surface of the part. The application solves the problem that the sandwich composite wedge-shaped trailing edge part with curvature lacks a matched positioning forming support mold body, which leads to a long manufacturing cycle and poor forming of the part. The application improves the forming precision of the part, shortens the manufacturing cycle, and saves manufacturing time and money cost.

Description

Technical Field

[0001] This invention relates to the field of sandwich composite material parts technology, and in particular to a curved sandwich composite material wedge-shaped tail edge part, molding tooling and molding method. Background Technology

[0002] Due to their excellent mechanical properties and lightweight advantages, sandwich composite materials are widely used in aircraft tail components. Wedge-shaped tail edge parts often use honeycomb sandwich composite materials, which include a lower skin, a honeycomb core and an upper skin laid from bottom to top. The lower skin is formed by laying multiple layers.

[0003] Currently, for the molding requirements of wedge-shaped trailing edge parts with curved sandwich composite materials, there is a lack of matching positioning and molding support molds for such parts, resulting in long manufacturing cycles and difficulty in good molding, which makes it difficult to meet the high precision and high quality molding and assembly requirements of the aerospace industry for such parts.

[0004] Therefore, there is an urgent need for wedge-shaped tail edge parts with curved sandwich composite materials, molding tooling, and molding methods to solve the above problems. Summary of the Invention

[0005] The first objective of this invention is to provide a molding fixture for wedge-shaped tail edge parts with curved sandwich composite materials, which is adapted to the molding requirements of the preset curvature of the parts, accurately positions each layup and limits curing deformation, ensures the layup bonding accuracy, improves the molding accuracy of the parts, has a short manufacturing cycle and can be molded well, improves the dimensional stability of the lower skin and the overall parts, ensures the structural integrity and mechanical properties of the wedge-shaped tail edge parts with curved sandwich composite materials, and meets the requirements of high-precision molding and assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution: A molding fixture for a curved sandwich composite material wedge-shaped tail edge part is used to mold such a part. The curved sandwich composite material wedge-shaped tail edge part includes a lower skin, a core layer, and an upper skin, sequentially laid from bottom to top. The core layer includes a honeycomb core, two end ribs, and two stops. The two end ribs and the two stops are symmetrically arranged on both sides of the honeycomb core. The lower skin includes arc-shaped layups, C-shaped layups, and Z-shaped layups sequentially laid from bottom to top. The molding fixture for the curved sandwich composite material wedge-shaped tail edge part includes: The main mold body is configured to position the arc-shaped layup, support the molding and curing of the lower skin, and adapt to the preset curvature of the lower skin. The positioning mold can be used to lay the C-type layup and can be placed at a preset position on the arc-shaped layup laid on the main laying mold, so that the C-type layup is transferred and attached to the corresponding position on the arc-shaped layup; and the positioning mold and the main laying mold can cooperate to position the Z-type layup on the corresponding position on the arc-shaped layup and the C-type layup. The deformation limiting module includes a stop bar and a cover plate. The stop bar can be placed on the Z-layup and the side of the positioning mold, and is configured to limit the deformation of the side surface of the lower skin as a whole during curing. The cover plate can be placed on the Z-layup and is configured to limit the deformation of the upper surface of the lower skin as a whole during curing.

[0007] As an optional solution for forming a wedge-shaped tail edge part of a curved sandwich composite material, the forming tooling for forming a wedge-shaped tail edge part of a curved sandwich composite material further includes a forming punch, which is provided with a forming protrusion adapted to the end rib, and the end rib can be attached to the forming punch and formed into a C-shaped structural part.

[0008] As an optional solution for forming a wedge-shaped tail edge part of a composite material with curvature sandwich layer, the forming tooling for the wedge-shaped tail edge part of the composite material with curvature sandwich layer further includes two limiting molds. The two limiting molds are configured to position and press and fix the two ends of the whole part after the upper skin, the sandwich layer and the lower skin are assembled.

[0009] As an optional solution for forming a wedge-shaped tail edge part of a composite material with curvature sandwich, the limiting mold body is provided with a positioning groove, which is adapted to the contour of the upper skin end, the core layer end and the lower skin end to position the bonding reference of the upper skin, the core layer and the lower skin.

[0010] As an optional solution for forming a wedge-shaped tail edge part of a composite material with curvature sandwich, the positioning mold body is provided with an arc-shaped positioning surface, which is adapted to the forming contour of the C-type layup and the contour of the surface to be bonded by the arc-shaped layup, so as to realize the transfer and placement positioning of the C-type layup.

[0011] As an alternative solution for forming a wedge-shaped tail edge part with a curved sandwich composite material, both the upper skin and the lower skin are made of a heat-curing material.

[0012] As an optional solution for forming a wedge-shaped tail edge part of a composite material with curvature sandwich, the surfaces of the main mold body, the positioning mold body, and the deformation limiting module are all provided with a release coating.

[0013] The second objective of this invention is to provide a method for forming a wedge-shaped tail edge part of a composite material with curvature sandwich layer, which is applied to the above-mentioned forming fixture for the wedge-shaped tail edge part of the composite material with curvature sandwich layer. This method adapts to the forming requirements of the preset curvature of the part, ensures the layup bonding accuracy and assembly consistency, guarantees the forming accuracy and dimensional stability of the part, and optimizes the aerodynamic and mechanical properties of the wedge-shaped tail edge part.

[0014] To achieve this objective, the present invention adopts the following technical solution: A method for forming a wedge-shaped tail edge part of a composite material with curvature sandwich layer, applied to the aforementioned forming fixture for such a part, includes the following steps: Step S100: Process the sandwich layer, and machine the honeycomb core, the two end ribs, and the two stops; Step S200: Position the arc-shaped ply onto the main plying mold, lay the C-shaped ply onto the positioning mold, align and place the positioning mold and the C-shaped ply on it onto the arc-shaped ply on the main plying mold and attach them together, and then lay the Z-shaped ply onto the corresponding positions on the arc-shaped ply and the C-shaped ply. Step S300: Place the stop bar on the Z-shaped ply and the side of the positioning mold, place the cover plate on the Z-shaped ply, and heat and cure to form the lower skin; Step S400: Remove the baffle, the cover plate and the positioning mold, remove the lower skin and trim the edges to correct the dimensions. After the trimming meets the standard, put it back on the main mold and fix it in position. Step S500: Apply structural adhesive film to the upper and lower surfaces of the two end ribs, the stop block and the upper and lower surfaces of the honeycomb core, apply expanding foam around the honeycomb core, place the honeycomb core on the lower skin, place the two end ribs symmetrically on both sides of the honeycomb core, place the two stop blocks symmetrically on both sides of the honeycomb core, and the end of the end rib abuts against the end of the stop block on its corresponding side, and then apply the upper skin to the sandwich layer and the lower skin. Step S600: Remove the integral part after adhesive bonding and curing, and trim the edges to correct the dimensions. After the trimming meets the standards, the finished product with curved sandwich composite material wedge tail edge part is obtained.

[0015] As an optional scheme for the molding method of a wedge-shaped tail edge part with curved sandwich composite material, step S100 and step S200 are implemented normally, and the end rib prepreg is laid. Step S200 is directly connected to step S500 and steps S300 and S400 are omitted. Step S500 is followed by step S501. In step S501: after the upper skin, the core layer and the lower skin are assembled, the whole part is thermo-cured. The cured whole part is removed and the edges are trimmed and the dimensions are corrected. After the trimming meets the standard, the finished product of the wedge-shaped tail edge part with curved sandwich composite material is obtained. Step S600 is omitted.

[0016] The third objective of this invention is to provide a wedge-shaped trailing edge part with curved sandwich composite material, which is manufactured using the above-mentioned molding method for the wedge-shaped trailing edge part with curved sandwich composite material, thereby improving the strength and deformation resistance of the part, achieving a balance between lightweight and high load-bearing capacity, optimizing the aerodynamic and mechanical properties of the wedge-shaped trailing edge part, and meeting the high-precision and high-quality molding and assembly requirements of the aerospace field for such parts.

[0017] To achieve this objective, the present invention adopts the following technical solution: A curved sandwich composite material wedge-shaped tail edge part is manufactured using the above-described molding method for curved sandwich composite material wedge-shaped tail edge parts. The curved sandwich composite material wedge-shaped tail edge part includes a lower skin, a core layer, and an upper skin that are sequentially laid from bottom to top. The core layer includes a honeycomb core, two end ribs, and two stops. The two end ribs are symmetrically arranged on both sides of the honeycomb core, and the two stops are symmetrically arranged on both sides of the honeycomb core. The lower skin includes an arc-shaped ply, a C-shaped ply, and a Z-shaped ply that are sequentially laid from bottom to top. The lower skin, the core layer, and the upper skin are fixedly connected to each other.

[0018] The beneficial effects of this invention are: This invention provides a molding fixture for a wedge-shaped tail edge part made of curved sandwich composite material. This fixture achieves precise placement and positioning of the arc-shaped layup through a main mold body, adapting to the preset curvature of the lower skin. A positioning mold body transfers and adheres the C-shaped layup to the arc-shaped layup. Simultaneously, the main mold body positions the Z-shaped layup, and a retaining strip in the deformation limiting module restricts deformation of the side surfaces of the lower skin during curing, while a cover plate restricts deformation of the upper surface. Through the coordinated operation of the main mold body, positioning mold body, and deformation limiting module, this molding fixture adapts to the molding requirements of the part's preset curvature, precisely positions each layup, and limits curing deformation, ensuring layup adhesion accuracy and effectively improving part molding precision. It also features a short manufacturing cycle, good molding performance, and improved dimensional stability of the lower skin and the overall part. This ensures the structural integrity and mechanical properties of the curved sandwich composite material wedge-shaped tail edge part, meeting the requirements for high-precision molding and assembly.

[0019] This invention also provides a method for molding a wedge-shaped tail edge part of a composite material with curvature sandwich layer. The method involves first machining a honeycomb core, two end ribs, and two stops to initially obtain a sandwich layer. Then, an arc-shaped layup is positioned by laying a main mold body. A C-shaped layup is then bonded to the arc-shaped layup using the positioning mold body. A Z-shaped layup is then laid on top, followed by the placement of a stop strip and a cover plate. The lower skin is then heated and cured to form a molded surface. The relevant tooling is removed, the lower skin is trimmed, and then placed back onto the main mold body for fixation. Subsequently, a structural adhesive film is laid on the surface of each component of the sandwich layer. The honeycomb core, end ribs, and stops are then assembled into their corresponding positions on the lower skin. After laying the upper skin, a second bonding and curing process is achieved. Finally, a second trimming and correction process is performed to obtain the finished part. This molding method, through the coordinated cooperation of the main mold body, positioning mold body, stop strip and cover plate, adapts to the molding requirements of the preset curvature of the part, ensures the accuracy of the layup and the consistency of the assembly, and improves the overall structure through thermosetting and secondary adhesive curing, effectively ensuring the molding accuracy and dimensional stability of the part, and optimizing the aerodynamic and mechanical properties of the wedge-shaped tail edge part.

[0020] This invention also provides a wedge-shaped tail edge part with curved sandwich composite material. The lower skin is laid with arc-shaped, C-shaped, and Z-shaped plies sequentially from bottom to top, and together with the upper skin, it clamps the core layer. The core layer uses honeycomb core, end ribs, and blocks to enhance the structural rigidity, improve the strength and deformation resistance of the part, achieve both lightweight and high load-bearing performance, optimize the aerodynamic and mechanical properties of the wedge-shaped tail edge part, and meet the high-precision and high-quality forming and assembly requirements of the aerospace field for this type of part. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the forming tooling for the wedge-shaped tail edge part of the composite material with curvature sandwich layer described in an embodiment of the present invention; Figure 2 This is an exploded view of the forming tooling for the wedge-shaped tail edge part of the composite material with curvature sandwich layer described in the embodiment of the present invention; Figure 3 This is a schematic diagram of the wedge-shaped tail edge part with curved sandwich composite material according to an embodiment of the present invention; Figure 4 This is an exploded view of the wedge-shaped tail edge part with curved sandwich composite material described in the embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of point A in the middle; Figure 6 This is a first schematic diagram of step S200 of the method for forming a wedge-shaped tail edge part with a curved sandwich composite material according to an embodiment of the present invention; Figure 7This is a second schematic diagram of step S200 of the method for forming a wedge-shaped tail edge part with a curved sandwich composite material according to an embodiment of the present invention; Figure 8 This is a third schematic diagram of step S200 in the method for forming a wedge-shaped tail edge part with a curved sandwich composite material according to an embodiment of the present invention; Figure 9 This is a schematic diagram of step S300 of the method for forming a wedge-shaped tail edge part with a curved sandwich composite material according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the molding tooling and end ribs described in an embodiment of the present invention.

[0022] In the picture: 110. Lower skin; 111. Arc-shaped ply; 112. C-type ply; 113. Z-type ply; 120. Sandwich layer; 121. Honeycomb core; 122. End rib; 123. Stop block; 130. Upper skin; 1. Lay out the main mold body; 2. Position the mold body; 21. Curved positioning surface; 3. Deformation limiting module; 31. Stop bar; 32. Cover plate; 4. Forming punch; 5. Limiting mold body. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1 like Figures 1 to 2 As shown, this embodiment provides a wedge-shaped tail edge part with curved sandwich composite material, a molding tooling, and a molding method. The molding tooling for the wedge-shaped tail edge part with curved sandwich composite material is used to mold the wedge-shaped tail edge part with curved sandwich composite material. The molding method for the wedge-shaped tail edge part with curved sandwich composite material is applied to the molding tooling for the wedge-shaped tail edge part with curved sandwich composite material. The wedge-shaped tail edge part with curved sandwich composite material is manufactured using the molding method for the wedge-shaped tail edge part with curved sandwich composite material of this embodiment.

[0028] like Figures 3 to 5 As shown, the curved sandwich composite material wedge-shaped tail edge part of this embodiment includes a lower skin 110, a core layer 120 and an upper skin 130 laid sequentially from bottom to top. The core layer 120 includes a honeycomb core 121, two end ribs 122 and two blocks 123. The two end ribs 122 are symmetrically arranged on both sides of the honeycomb core 121, and the two blocks 123 are symmetrically arranged on both sides of the honeycomb core 121. The lower skin 110 includes an arc-shaped layup 111, a C-shaped layup 112 and a Z-shaped layup 113 laid sequentially from bottom to top. The lower skin 110, the core layer 120 and the upper skin 130 are fixedly connected to each other. The lower skin 110 is laid from bottom to top with arc-shaped ply 111, C-shaped ply 112 and Z-shaped ply 113, which together with the upper skin 130 hold the core layer 120. The core layer 120 uses honeycomb core 121, end ribs 122 and stop blocks 123 to enhance the structural rigidity, improve the strength and deformation resistance of the parts, achieve both lightweight and high load-bearing performance, optimize the aerodynamic and mechanical characteristics of the wedge-shaped tail edge parts, and meet the high precision and high quality forming and assembly requirements of the aerospace field for such parts.

[0029] like Figures 6 to 9As shown, the forming fixture for a wedge-shaped tail edge part of a composite material with curvature sandwich structure includes a main mold body 1 for laying, a positioning mold body 2, and a deformation limiting module 3. The main mold body 1 is used for laying and positioning the arc-shaped ply 111, supporting the forming and curing of the lower skin 110, and adapting to the preset curvature of the lower skin 110. The positioning mold body 2 can lay C-shaped ply 112 on it and can be placed at a preset position on the arc-shaped ply 111 laid on the main mold body 1, so that the C-shaped ply 112 is transferred and attached to the arc-shaped ply 111. The corresponding positions; and the positioning mold 2 and the main laying mold 1 can work together to position the Z-shaped lay-up 113 on the corresponding positions of the arc-shaped lay-up 111 and the C-shaped lay-up 112; the deformation limiting module 3 includes a baffle 31 and a cover plate 32. The baffle 31 can be placed on the Z-shaped lay-up 113 and the side of the positioning mold 2 to limit the deformation of the side surface of the lower skin 110 during the curing process; the cover plate 32 can be placed on the Z-shaped lay-up 113 to limit the deformation of the upper surface of the lower skin 110 during the curing process.

[0030] The forming fixture for the curved sandwich composite material wedge-shaped tail edge part achieves precise placement and positioning of the arc-shaped lay-up 111 through the laying main mold body 1, and adapts to the preset curvature of the lower skin 110. The positioning mold body 2 can transfer and attach the C-shaped lay-up 112 to the arc-shaped lay-up 111. At the same time, it works with the laying main mold body 1 to position the Z-shaped lay-up 113. The baffle 31 in the deformation limiting module 3 limits the deformation of the side surface of the lower skin 110 during the curing process, and the cover plate 32 limits the deformation of the upper surface of the lower skin 110 during the curing process. This molding fixture, through the coordinated operation of the main mold body 1, the positioning mold body 2, and the deformation limiting module 3, adapts to the molding requirements of the preset curvature of the part, accurately positions each layup and limits the curing deformation, ensures the layup bonding accuracy, effectively improves the molding accuracy of the part, has a short manufacturing cycle and can form well, effectively improves the dimensional stability of the lower skin 110 and the overall part, ensures the structural integrity and mechanical properties of the wedge-shaped tail edge part with curved sandwich composite material, and meets the requirements of high-precision molding and assembly.

[0031] like Figures 1 to 9 As shown, the molding method for a wedge-shaped tail edge part with curved sandwich composite material is applied to the molding fixture for the wedge-shaped tail edge part with curved sandwich composite material in this embodiment. The molding method for the wedge-shaped tail edge part with curved sandwich composite material includes the following steps: Step S100: Process the sandwich layer 120, and machine the honeycomb core 121, two end ribs 122 and two stops 123; Step S200: Position the arc-shaped ply 111 on the main ply body 1, lay the C-shaped ply 112 on the positioning body 2, align and place the positioning body 2 and the C-shaped ply 112 on the arc-shaped ply 111 on the main ply body 1 and attach them, and then lay the Z-shaped ply 113 on the corresponding positions of the arc-shaped ply 111 and the C-shaped ply 112; Step S300: Place the baffle 31 on the Z-shaped layup 113 and the side of the positioning mold 2, place the cover plate 32 on the Z-shaped layup 113, and heat and cure to form the lower skin 110; Step S400: Remove the baffle strip 31, cover plate 32 and positioning mold 2, remove the lower skin 110 and trim the edges to correct the size. After the trimming meets the standard, put it back on the main mold 1 and fix it in position. Step S500: Apply structural adhesive film to the upper and lower surfaces of the two end ribs 122, the stop blocks 123 and the upper and lower surfaces of the honeycomb core 121. Apply expanding foam around the honeycomb core 121. Place the honeycomb core 121 on the lower skin 110. Place the two end ribs 122 symmetrically on both sides of the honeycomb core 121. Place the two stop blocks 123 symmetrically on both sides of the honeycomb core 121. The ends of the end ribs 122 abut against the ends of the stop blocks 123 on their corresponding sides. Then apply the upper skin 130 to the sandwich layer 120 and the lower skin 110. Step S600: Remove the integral part after adhesive bonding and curing, and trim the edges to correct the dimensions. After the trimming meets the standards, the finished product with curved sandwich composite material wedge tail edge part is obtained.

[0032] The method for forming a wedge-shaped tail edge part of a curved sandwich composite material firstly involves machining a honeycomb core 121, two end ribs 122, and two stops 123 to initially obtain a sandwich layer 120. Then, an arc-shaped layup 111 is positioned by laying a main mold body 1. With the help of a positioning mold body 2, a C-shaped layup 112 is bonded to the arc-shaped layup 111. After laying a Z-shaped layup 113 on top, a stop strip 31 and a cover plate 32 are placed. The lower skin 110 is then formed by heating and curing. The relevant tooling is removed, the lower skin 110 is trimmed, and then placed back on the main mold body 1 for fixation. Subsequently, a structural adhesive film is laid on the surface of each component of the sandwich layer 120. The honeycomb core 121, end ribs 122, and stops 123 are assembled into the corresponding positions on the lower skin 110. After laying the upper skin 130, a second bonding and curing is achieved. Finally, a second trimming and correction is performed to obtain the finished part. This molding method, through the coordinated cooperation of the main mold body 1, positioning mold body 2, stop strip 31 and cover plate 32, adapts to the molding requirements of the preset curvature of the part, ensures the accuracy of the layup and the consistency of the assembly, and improves the overall structure through thermosetting and secondary adhesive curing, effectively ensuring the molding accuracy and dimensional stability of the part, and optimizing the aerodynamic and mechanical properties of the wedge-shaped tail edge part.

[0033] like Figure 10As shown, the forming fixture for the wedge-shaped tail edge part of the curved sandwich composite material also includes a forming punch 4. The forming punch 4 is provided with forming protrusions that are adapted to the end rib 122. The end rib 122 can be laid on the forming punch 4 and formed into a C-shaped structural part. This ensures the forming accuracy and structural consistency of the end rib 122, further improves the overall assembly accuracy of the part, helps to ensure the structural stability and mechanical properties of the wedge-shaped tail edge part of the curved sandwich composite material, and meets the requirements of high-precision forming.

[0034] like Figure 1 As shown, the molding fixture for the curved sandwich composite wedge-shaped tail edge part also includes two limiting molds 5. These two limiting molds 5 are used to position and press and fix the two ends of the overall part after the upper skin 130, the core layer 120, and the lower skin 110 are assembled. The two limiting molds 5 effectively prevent displacement and misalignment of the part after assembly, ensuring the consistency and positional accuracy of the assembly of each component, reducing deformation at both ends during curing, and further improving the molding quality and dimensional stability of the curved sandwich composite wedge-shaped tail edge part, thus meeting high-precision molding requirements.

[0035] In this embodiment, the limiting mold body 5 is provided with a positioning groove, which is adapted to the contours of the ends of the upper skin 130, the core layer 120, and the lower skin 110 to position the bonding reference of the upper skin 130, the core layer 120, and the lower skin 110. The positioning groove on the limiting mold body 5 is precisely adapted to the end contours of the upper skin 130, the core layer 120, and the lower skin 110, ensuring accurate bonding position, effectively avoiding bonding misalignment and offset, improving the firmness and assembly accuracy of the connection of each component, further ensuring the molding quality and structural stability of the overall part, and meeting high-precision molding requirements.

[0036] like Figure 2 and Figure 7 As shown, the positioning mold 2 has an arc-shaped positioning surface 21, which is adapted to the forming contour of the C-type layup 112 and the surface contour of the arc-shaped layup 111 to be bonded, so as to realize the transfer and placement positioning of the C-type layup 112. The arc-shaped positioning surface 21 on the positioning mold 2 is adapted to the forming contour of the C-type layup 112 and the surface contour of the arc-shaped layup 111 to be bonded, which can realize the precise transfer and placement positioning of the C-type layup 112, effectively reduce the layup positioning deviation, ensure the layup bonding quality and consistency, and improve the overall forming accuracy and process stability of the wedge-shaped tail edge parts of the curved sandwich composite material.

[0037] In this embodiment, both the upper skin 130 and the lower skin 110 are made of thermosetting materials. The use of thermosetting materials for the upper skin 130 and lower skin 110 allows for good molding and curing effects during the thermosetting process, ensuring the dimensional stability of the skin structure, improving the overall molding quality and structural reliability of the parts, and meeting the usage requirements of wedge-shaped tail edge parts with curved sandwich composite materials.

[0038] In this embodiment, the surfaces of the main mold body 1, the positioning mold body 2, and the deformation-limiting module 3 are all coated with a release coating. The release coating on the surfaces of the main mold body 1, the positioning mold body 2, and the deformation-limiting module 3 effectively prevents adhesion to the parts during the heating and curing process, ensuring the molding accuracy and surface quality of the parts, improving production efficiency and product qualification rate, and meeting the molding requirements of complex curved surface parts. Optionally, the release coating can be a polytetrafluoroethylene coating, an organosilicon release coating, or a ceramic-based release coating, etc., and is not specifically limited here.

[0039] Example 2 This embodiment provides a method for molding a wedge-shaped tail edge part of a composite material with curvature sandwich layer. The difference between this method and Embodiment 1 is that steps S100 and S200 are performed normally, and the prepreg of the end rib 122 is laid and the limiting mold body 5 is positioned. Step S200 is directly connected to step S500 and steps S300 and S400 are omitted. Step S501 is included after step S500. Step S501: After the upper skin 130, the core layer 120 and the lower skin 110 are assembled, the whole part is thermo-cured. The cured whole part is removed and the edges are trimmed and the dimensions are corrected. After the trimming meets the standard, the finished product wedge-shaped tail edge part of the composite material with curvature sandwich layer is obtained. Step S600 is omitted.

[0040] After assembling the upper skin 130, core layer 120, and lower skin 110, they are thermosetting and then trimmed to obtain the finished product. The core layer 120 and lower skin 110, as well as the upper skin 130 and core layer 120, are directly bonded together using a structural adhesive film. This process reduces one trimming step, integrates the molding process, simplifies the molding process, reduces tooling disassembly and reassembly and multiple positioning operations, improves production efficiency, and saves curing costs and time, thus reducing costs. The dual curing methods of thermosetting and structural adhesive film ensure the connection strength and structural stability of the upper skin 130, core layer 120, and lower skin 110, effectively guaranteeing the molding accuracy and mechanical properties of the parts. Optionally, the structural adhesive film can be replaced with expanding foam; no specific limitation is made here.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material, used for forming a wedge-shaped tail edge part with a curved sandwich composite material, characterized in that, The curved sandwich composite material wedge-shaped tail edge part includes a lower skin (110), a core layer (120), and an upper skin (130) laid sequentially from bottom to top. The core layer (120) includes a honeycomb core (121), two end ribs (122), and two stops (123). The two end ribs (122) are symmetrically arranged on both sides of the honeycomb core (121), and the two stops (123) are symmetrically arranged on both sides of the honeycomb core (121). The lower skin (110) includes an arc-shaped layup (111), a C-shaped layup (112), and a Z-shaped layup (113) laid sequentially from bottom to top. The forming fixture for the curved sandwich composite material wedge-shaped tail edge part includes: The main mold body (1) is configured to position the arc-shaped lay-up (111) and support the molding and curing of the lower skin (110), and is adapted to the preset curvature of the lower skin (110). The positioning mold (2) is capable of laying the C-type layup (112) on it and can be placed at a preset position on the arc-shaped layup (111) laid on the main laying mold (1) so that the C-type layup (112) can be transferred and attached to the corresponding position on the arc-shaped layup (111); and the positioning mold (2) and the main laying mold (1) can cooperate to position the Z-type layup (113) laid on the corresponding position on the arc-shaped layup (111) and the C-type layup (112); The deformation limiting module (3) includes a baffle (31) and a cover plate (32). The baffle (31) can be placed on the Z-shaped layup (113) and the side of the positioning mold (2), and is configured to limit the deformation of the side surface of the lower skin (110) as a whole during the curing process. The cover plate (32) can be placed on the Z-shaped layup (113) and is configured to limit the deformation of the upper surface of the lower skin (110) as a whole during the curing process.

2. The forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material according to claim 1, characterized in that, The forming tooling for the curved sandwich composite material wedge tail edge part also includes a forming punch (4), which has a forming protrusion adapted to the end rib (122). The end rib (122) can be attached to the forming punch (4) and formed into a C-shaped structure.

3. The forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material according to claim 1, characterized in that, The forming fixture for the curved sandwich composite material wedge-shaped tail edge part also includes two limiting molds (5). The two limiting molds (5) are configured to position and press and fix the two ends of the whole part after the upper skin (130), the sandwich layer (120) and the lower skin (110) are assembled.

4. The forming fixture for the wedge-shaped tail edge part with curved sandwich composite material according to claim 3, characterized in that, The limiting mold (5) is provided with a positioning groove, which is adapted to the contours of the end of the upper skin (130), the end of the core layer (120) and the end of the lower skin (110) to position the bonding reference of the upper skin (130), the core layer (120) and the lower skin (110).

5. The forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material according to any one of claims 1-4, characterized in that, The positioning mold (2) is provided with an arc-shaped positioning surface (21), which is adapted to the forming contour of the C-type layup (112) and to the contour of the surface to be bonded of the arc-shaped layup (111), so as to realize the transfer and laying positioning of the C-type layup (112).

6. The forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material according to any one of claims 1-4, characterized in that, Both the upper skin (130) and the lower skin (110) are made of heat-curing materials.

7. The forming fixture for a wedge-shaped tail edge part with a curved sandwich composite material according to any one of claims 1-4, characterized in that, The surfaces of the main mold body (1), the positioning mold body (2), and the deformation limiting module (3) are all provided with a release coating.

8. A method for molding a wedge-shaped tail edge part with a curved sandwich composite material, characterized in that, The tooling for forming a wedge-shaped trailing edge part of a composite material with curvature sandwich structure, applicable to any one of claims 1-6, comprises the following steps: Step S100: Process the sandwich layer (120), and machine the honeycomb core (121), the two end ribs (122) and the two stops (123). Step S200: Position the arc-shaped ply (111) on the main plying mold (1), lay the C-shaped ply (112) on the positioning mold (2), align the positioning mold (2) and the C-shaped ply (112) on it on the arc-shaped ply (111) on the main plying mold (1) and attach them together, and then lay the Z-shaped ply (113) on the corresponding positions of the arc-shaped ply (111) and the C-shaped ply (112); Step S300: Place the baffle (31) on the Z-shaped layup (113) and the side of the positioning mold (2), place the cover plate (32) on the Z-shaped layup (113), and heat and solidify to form the lower skin (110). Step S400: Remove the baffle (31), the cover plate (32) and the positioning mold (2), remove the lower skin (110) and trim the edges to correct the dimensions. After the trimming meets the standard, put it back on the laying main mold (1) and fix it in position. Step S500: Apply structural adhesive film to the upper and lower surfaces of the two end ribs (122), the stop block (123), and the upper and lower surfaces of the honeycomb core (121). Apply expanding foam around the honeycomb core (121). Place the honeycomb core (121) on the lower skin (110). Place the two end ribs (122) symmetrically on both sides of the honeycomb core (121). Place the two stop blocks (123) symmetrically on both sides of the honeycomb core (121). The end of the end rib (122) abuts against the end of the stop block (123) on its corresponding side. Then apply the upper skin (130) to the sandwich layer (120) and the lower skin (110). Step S600: Remove the integral part after adhesive bonding and curing, and trim the edges to correct the dimensions. After the trimming meets the standards, the finished product with curved sandwich composite material wedge tail edge part is obtained.

9. The method for forming a wedge-shaped tail edge part with a curved sandwich composite material according to claim 8, characterized in that, The steps S100 and S200 are implemented normally, and the prepreg of the end rib (122) is laid. The step S200 is directly connected to the step S500 and the steps S300 and S400 are omitted. The step S500 is followed by the step S501. The step S501 is as follows: After the upper skin (130), the sandwich layer (120) and the lower skin (110) are assembled, the whole part is thermo-cured. The whole part after curing is removed and the edge is trimmed to correct the size. After the edge trimming meets the standard, the finished product of the curved sandwich composite material wedge tail edge part is obtained. Step S600 is omitted.

10. A wedge-shaped tail edge part with a curved sandwich composite material, characterized in that, The part is manufactured using the molding method of the curved sandwich composite material wedge-shaped tail edge as described in claim 8 or 9. The curved sandwich composite material wedge-shaped tail edge part includes the lower skin (110), the core layer (120) and the upper skin (130) laid sequentially from bottom to top. The core layer (120) includes the honeycomb core (121), two end ribs (122) and two stops (123). The two end ribs (122) are symmetrically arranged on both sides of the honeycomb core (121), and the two stops (123) are symmetrically arranged on both sides of the honeycomb core (121). The lower skin (110) includes the arc-shaped layup (111), the C-shaped layup (112) and the Z-shaped layup (113) laid sequentially from bottom to top. The lower skin (110), the core layer (120) and the upper skin (130) are fixedly connected to each other.

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