A composite material cylinder segment co-curing molding and demolding device

Abstract

This utility model belongs to the field of mold design technology and discloses a composite material cylindrical segment co-curing molding and demolding device. The composite material cylindrical segment co-curing molding and demolding device includes a first mold, a second mold, and a fixing component. The first mold includes a large end and a small end, with the inner diameter gradually decreasing from the large end to the small end. The outer surface of the first mold has a receiving groove and a positioning hole. The receiving groove is used to receive a hat-shaped stringer, and the side of the receiving groove near the small end of the mold is connected to the positioning hole. The second mold can be fixedly installed in the positioning hole. The second mold includes a mounting flange and a forming groove. The mounting flange can fit against the inner surface of the first mold, and the forming groove is used to form the end of the hat-shaped stringer. The fixing component is configured to fix the first mold and the second mold. This utility model can solve the problem of interference between the end of the hat-shaped stringer and the inner wall of the first mold during demolding, thus improving demolding efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mold design technology, and in particular to a composite material cylinder segment co-curing molding and demolding device. Background Technology

[0002] Co-curing is a key technology in composite material manufacturing. It refers to integrating the molding and bonding processes of multiple composite components within the same curing cycle, achieving integrated manufacturing through a single heating and pressurization process for component molding and interfacial bonding. In civil aircraft structural manufacturing, the co-curing process is used for the fuselage skin section and the cap stringer. This reduces the use of fasteners in traditional assembly, lowers structural weight, and meets the lightweight design requirements of aircraft. Simultaneously, it improves the interfacial bonding strength and structural integrity between the fuselage skin section and the cap stringer, avoids stress concentration problems caused by assembly gaps, and enhances the structure's fatigue resistance and durability.

[0003] The implementation of co-curing processes relies on molds and tooling. In existing technologies, molds are mainly divided into two categories: modular segmented molds and integral molds. Modular segmented molds achieve part demolding by splitting the mold into multiple parts, which requires extremely high precision in the fit between the mold parts and strict control of assembly gaps and positioning errors. This increases the difficulty of mold design and processing, and raises costs. In integral molds, when the demolding direction of the part is the fuselage heading, the end of the cap-shaped stringer will interfere with the inner wall of the mold, making the demolding process impossible. Utility Model Content

[0004] The purpose of this invention is to provide a composite material cylindrical section co-curing molding and demolding device to solve the problem of interference between the end of the cap-shaped stringer and the inner wall of the mold during demolding.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A composite material cylindrical segment co-curing molding and demolding device is used for co-curing aircraft fuselage cylindrical segment skin and cap-shaped stringers, comprising:

[0007] The first mold includes a large end and a small end. The first mold is cylindrical in shape, and its inner diameter gradually decreases from the large end to the small end. The outer surface of the first mold is provided with multiple receiving grooves and multiple positioning holes. The receiving grooves extend along the axial direction of the first mold. The multiple receiving grooves are circumferentially spaced on the outer surface of the first mold. The receiving grooves are used to receive the hat-shaped stringer. The positioning holes are close to the small end of the first mold. The side of each receiving groove near the small end of the mold is connected to the positioning hole.

[0008] The second mold can be fixedly installed in the positioning hole and the top surface of the second mold protrudes from the outer surface of the first mold. The second mold includes a mounting flange and a forming groove. The mounting flange can fit into the inner surface of the first mold. The forming groove is used to form the end of the hat-shaped stringer. The distance from the top surface of the second mold to the bottom of the forming groove is less than the distance from the top surface of the second mold to the outer surface of the first mold.

[0009] The fastener is configured to secure the first mold and the second mold.

[0010] The aforementioned composite material cylinder segment co-curing molding and demolding device includes a second mold comprising a first mounting block and a second mounting block. The first mounting block is provided with a mounting flange, and the second mounting block is detachably and fixedly connected to the side of the first mounting block opposite to the mounting flange. The second mounting block is provided with a molding groove.

[0011] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the thickness of the first mounting block is equal to the thickness of the first mold.

[0012] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the receiving groove is a rectangular groove with rounded corners at the bottom.

[0013] The aforementioned composite material cylinder segment co-curing molding and demolding device includes a receiving groove on the outer surface of the first mold and a protrusion on the inner surface of the first mold.

[0014] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the fixing member is a fastening bolt, the mounting flange has a mounting hole, the inner surface of the first mold has a mounting thread hole, and the fixing member can pass through the mounting hole and be screwed into the mounting thread hole.

[0015] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the shape of the mounting flange is rectangular, and one mounting hole is opened on one set of opposite corners of the mounting flange, and two mounting holes are opened on the other set of opposite corners of the mounting flange.

[0016] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the mounting hole is an oblong hole, the mounting flange is rectangular in shape, and a mounting hole is provided at each of the four corner points of the mounting flange.

[0017] In the aforementioned composite material cylinder segment co-curing molding and demolding device, the molding groove is a rectangular groove or a circular groove.

[0018] The aforementioned composite material cylinder segment co-curing molding and demolding device includes a first mold with a release agent applied to its outer surface.

[0019] The beneficial effects of this utility model are:

[0020] The composite material cylindrical segment co-curing molding and demolding device provided by this utility model involves fixing a second mold in a positioning hole during use, laying a hat-shaped stringer in the receiving groove of the first mold, with the end of the hat-shaped stringer placed in the forming groove of the second mold, and then performing a co-curing molding process. During demolding, the second mold is disassembled from the inside of the first mold. Since the distance from the top surface of the second mold to the bottom of the forming groove is less than the distance from the top surface of the second mold to the outer surface of the first mold, there is a certain gap between the end of the hat-shaped stringer and the surface of the first mold after the second mold is disassembled. The hat-shaped stringer will not interfere with the first mold when demolding along the fuselage flight direction. At the same time, the first mold and the second mold have less interaction, which can reduce the processing difficulty and improve the molding efficiency of the aircraft fuselage cylindrical segment skin. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first mold and the second mold in cooperation from a first perspective, provided in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the first mold and the second mold in cooperation from a second perspective, provided in an embodiment of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the first mold provided in this embodiment of the present invention from a first perspective;

[0024] Figure 4 This is a structural schematic diagram of the first mold provided in this embodiment of the present invention from a second perspective;

[0025] Figure 5 This is a schematic diagram of the structure of the second mold provided in this embodiment of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the aircraft fuselage section skin and the hat-shaped stringer provided in this embodiment of the utility model.

[0027] In the picture:

[0028] 1. First mold; 11. Large end of mold; 12. Small end of mold; 13. Receiving groove; 14. Positioning hole;

[0029] 2. Second mold; 21. Install the flange; 211. Mounting hole;

[0030] 100. Aircraft fuselage section skin; 101. Hat-shaped stringer. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, 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 utility model according to the specific circumstances.

[0033] In the description of this utility model, 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 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 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.

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] like Figures 1-6As shown, the composite material cylindrical segment co-curing molding and demolding device includes a first mold 1, a second mold 2, and a fixing component. The first mold 1 includes a large end 11 and a small end 12. The first mold 1 is cylindrical in shape, and its inner diameter gradually decreases from the large end 11 to the small end 12. Multiple receiving grooves 13 and multiple positioning holes 14 are provided on the outer surface of the first mold 1. The receiving grooves 13 extend along the axial direction of the first mold 1, and the multiple receiving grooves 13 are circumferentially spaced on the outer surface of the first mold 1. The receiving grooves 13 are used to accommodate the cap-shaped stringer 101. The positioning holes 14... Near the small end 12 of the first mold 1, each receiving groove 13 is connected to the positioning hole 14 on one side near the small end 12 of the mold 1; the second mold 2 can be fixedly installed in the positioning hole 14 and the top surface of the second mold 2 protrudes from the outer surface of the first mold 1. The second mold 2 includes a mounting flange 21 and a forming groove. The mounting flange 21 can fit against the inner surface of the first mold 1. The forming groove is used to form the end of the hat-shaped stringer 101. The distance from the top surface of the second mold 2 to the bottom of the forming groove is less than the distance from the top surface of the second mold 2 to the outer surface of the first mold 1; the fastener is configured to fix the first mold 1 and the second mold 2.

[0036] The composite material cylindrical segment co-curing molding and demolding device provided by this utility model involves fixing the second mold 2 in the positioning hole 14 during use, laying a hat-shaped stringer 101 in the receiving groove 13 of the first mold 1, with the end of the hat-shaped stringer 101 set in the molding groove of the second mold 2, and then performing a co-curing molding process. During demolding, the second mold 2 is removed from the inside of the first mold 1. Since the distance from the top surface of the second mold 2 to the bottom of the molding groove is less than the distance from the top surface of the second mold 2 to the outer surface of the first mold 1, there is a certain gap between the end of the hat-shaped stringer 101 and the surface of the first mold 1 after the second mold 2 is removed. The hat-shaped stringer 101 will not interfere with the first mold 1 when demolding along the fuselage flight direction. At the same time, the first mold 1 and the second mold 2 have less contact, which can reduce the processing difficulty and improve the molding efficiency of the aircraft fuselage cylindrical segment skin 100.

[0037] This embodiment does not specifically limit the number of receiving slots 13; the number of receiving slots 13 can be designed based on the number of fuselage cap-shaped stringers 101. For example, see... Figures 1 to 4 The machine body is provided with four hat-shaped stringers 101, and therefore four receiving slots 13 are provided to place the hat-shaped stringers 101. Correspondingly, four positioning holes 14 are provided to install the second mold 2, and then the end of the hat-shaped stringer 101 is placed in the forming slot of the second mold 2.

[0038] It should be noted that a long string is provided on one side of the first mold 1. Since the long string extends directly to the small end 12 of the first mold 1, there is no need to set a positioning hole 14 to install the second mold 2. Only a clearance groove needs to be opened to place the long string.

[0039] Specifically, the second mold 2 includes a first mounting block and a second mounting block. The first mounting block is provided with a mounting flange 21. The second mounting block is detachably and fixedly connected to the side of the first mounting block away from the mounting flange 21. The second mounting block is provided with a forming groove. The second mounting block and the first mounting block are detachably connected, which allows for the replacement of forming grooves of different shapes, thereby improving applicability.

[0040] Furthermore, the thickness of the first mounting block is equal to the thickness of the first mold 1. After the mounting flange 21 is attached to the inner surface of the first mold 1, the first mounting block is aligned with the outer surface of the first mold 1. This ensures that the bottom of the forming groove of the second mounting block protrudes from the outer surface of the first mold 1, eliminating the need for additional checks on whether the bottom of the forming groove protrudes from the outer surface of the first mold 1 and improving forming efficiency.

[0041] Meanwhile, the first mounting block is flush with the outer surface of the first mold 1, which can avoid the hat-shaped stringer 101. There is no need to cut a groove on the side of the first mounting block to avoid the hat-shaped stringer 101. Only a groove needs to be cut on the side of the second mounting block to facilitate the placement of the end of the hat-shaped stringer 101 in the forming groove, thereby reducing processing steps and improving processing efficiency.

[0042] In this embodiment, the receiving groove 13 is a rectangular groove with rounded corners at the bottom. The rounded corners can reduce stress concentration and improve the strength of the aircraft fuselage section skin 100 after co-curing. At the same time, the rounded corners at the bottom can reduce the adhesion between the molding groove and the hat-shaped stringer 101, making demolding easier and improving demolding efficiency.

[0043] The receiving groove 13 of the first mold 1 can be formed by milling or stamping. Optionally, the receiving groove 13 of the first mold 1 is stamped. The receiving groove 13 is formed on the outer surface of the first mold 1, and the inner surface of the first mold 1 has a protrusion. The stamping process creates a receiving groove 13 on the surface of the first mold 1, while creating a protrusion on the inner surface of the first mold 1. This not only creates a receiving groove 13 but also compensates for the thickness, avoiding insufficient strength due to excessive thickness. This improves the strength of the first mold 1 and meets the requirements of the co-curing process.

[0044] In this embodiment, the fastener is a fastening bolt, the mounting flange 21 has a mounting hole 211, and the inner surface of the first mold 1 has a mounting thread hole. The fastener can pass through the mounting hole 211 and be screwed into the mounting thread hole. The threaded connection is convenient and has high connection strength.

[0045] Optionally, the mounting flange 21 is rectangular in shape. One mounting hole 211 is formed on one set of opposite diagonals of the mounting flange 21, and two mounting holes 211 are formed on the other set of opposite diagonals. Having one mounting hole 211 on each diagonal of one set creates a two-point positioning reference, preventing overall misalignment or optional parts during assembly and improving installation accuracy. Having two mounting holes 211 on each diagonal of the other set prevents the mounting holes 211 from misaligning with the mounting threaded holes due to dimensional tolerances or positional deviations, compensating for machining and assembly errors and ensuring smooth installation.

[0046] Optionally, the mounting hole 211 is an oblong hole, and the mounting flange 21 is rectangular in shape. A mounting hole 211 is provided at each of the four corner points of the mounting flange 21. In addition to compensating for dimensional tolerances and positional deviations, the oblong hole can also further compensate for displacement caused by temperature deformation and vibration, ensuring a stable and reliable connection and ensuring the smooth progress of the co-curing molding process.

[0047] In other embodiments, the fastener may also be an adhesive. Optionally, the fastener is an oxidation-responsive adhesive, such as a biomimetic mussel adhesive based on catechol oxidation, which can adhere to the first mold 1 and the second mold 2 under normal conditions, and the adhesion decreases after contact with potassium permanganate, making it easier to separate the first mold 1 and the second mold 2.

[0048] The shape of the forming groove needs to be designed according to construction requirements. For example, the forming groove can be a rectangular groove or a circular groove to adapt to the shape of the end of the aircraft fuselage cap stringer 101. When the forming groove is circular, it can form a circular end of the cap stringer 101. The radius of curvature of the circular cross section makes the load transfer more uniform and can reduce the peel stress between the aircraft fuselage skin 100 and the cap stringer 101. When the forming groove is circular, it can form a rectangular end of the cap stringer 101. In areas that bear concentrated loads, such as the landing gear connection area, the rectangular end of the cap stringer 101 can easily add a web to increase strength and thus increase service life.

[0049] In this embodiment, a release agent is applied to the outer surface of the first mold 1 to improve demolding efficiency. The release agent can be a fluorinated release agent, which can effectively prevent the composite material from sticking to the mold. Furthermore, the chemical inertness of the fluorinated release agent allows it to withstand the temperatures during co-curing and the highly corrosive substances encountered during the dendrite curing process.

[0050] Specifically, a release agent is also provided in the molding groove of the second mold 2 to facilitate demolding.

[0051] The usage process of the composite material cylinder segment co-curing molding and demolding device provided by this utility model is as follows: S1, clean the first mold 1 and the second mold 2 to ensure that the surface is free of contamination and foreign matter, thereby improving the molding quality; S2, install the second mold 2 onto the first mold 1, ensuring that the bottom of the molding groove of the second mold 2 protrudes beyond the outer surface of the first mold 1; S3, seal the inner surface of the first mold 1 with a vacuum bag and seal the surrounding area with sealing tape to ensure airtightness; S4, place the cap-shaped stringer 101 in the receiving groove 13 of the first mold 1, and then place the co-curing core mold and the R-zone twisting strip to raise the cap-shaped stringer 101. S5. The molding quality of the first mold 1; S6. The aircraft fuselage section skin 100 is laid on the outer surface of the first mold 1, and then the process cover plate is placed; S7. The vacuum bag is sealed on the process cover plate to ensure airtightness, and then the co-curing process of the aircraft fuselage section skin 100 and the cap-shaped stringer 101 is carried out; S8. The vacuum sealing bag on the inner surface of the first mold 1 is removed, and the second mold 2 is removed from the inside of the first mold 1; S9. The vacuum sealing bag on the outside of the first mold 1 is removed, and then other auxiliary materials and the process cover plate are removed; S10. The co-cured part is demolded from the mold large end 11 to the mold small end 12 of the first mold 1.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A composite material cylindrical segment co-curing molding and demolding device for co-curing aircraft fuselage cylindrical segment skin (100) and cap-shaped stringer (101), characterized in that, include: The first mold (1) includes a large end (11) and a small end (12). The first mold (1) is cylindrical in shape, and the inner diameter of the first mold (1) gradually decreases from the large end (11) to the small end (12). The outer surface of the first mold (1) is provided with a plurality of receiving grooves (13) and a plurality of positioning holes (14). The receiving grooves (13) extend along the axial direction of the first mold (1). The plurality of receiving grooves (13) are circumferentially spaced on the outer surface of the first mold (1). The receiving grooves (13) are used to receive the hat-shaped stringer (101). The positioning holes (14) are close to the small end (12) of the first mold (1). The side of each receiving groove (13) close to the small end (12) is connected to the positioning hole (14). The second mold (2) can be fixedly installed in the positioning hole (14) and the top surface of the second mold (2) protrudes from the outer surface of the first mold (1). The second mold (2) includes a mounting flange (21) and a forming groove. The mounting flange (21) can fit against the inner surface of the first mold (1). The forming groove is used to form the end of the hat-shaped stringer (101). The distance from the top surface of the second mold (2) to the bottom of the forming groove is less than the distance from the top surface of the second mold (2) to the outer surface of the first mold (1). The fastener is configured to secure the first mold (1) and the second mold (2).

2. The composite material cylinder segment co-curing molding and demolding device according to claim 1, characterized in that, The second mold (2) includes a first mounting block and a second mounting block. The first mounting block is provided with the mounting flange (21). The second mounting block is detachably fixedly connected to the side of the first mounting block away from the mounting flange (21). The second mounting block is provided with the forming groove.

3. The composite material cylinder segment co-curing molding and demolding device according to claim 2, characterized in that, The thickness of the first mounting block is equal to the thickness of the first mold (1).

4. The composite material cylinder segment co-curing molding and demolding device according to claim 1, characterized in that, The receiving groove (13) is a rectangular groove, and the bottom of the rectangular groove is rounded.

5. The composite material cylinder segment co-curing molding and demolding device according to claim 1, characterized in that, The outer surface of the first mold (1) is provided with a receiving groove (13), and the inner surface of the first mold (1) has a protrusion.

6. The composite material cylinder segment co-curing molding and demolding device according to claim 1, characterized in that, The fastener is a fastening bolt. The mounting flange (21) has a mounting hole (211). The inner surface of the first mold (1) has a mounting thread hole. The fastener can pass through the mounting hole (211) and be screwed into the mounting thread hole.

7. The composite material cylinder segment co-curing molding and demolding device according to claim 6, characterized in that, The mounting flange (21) is rectangular in shape. One mounting hole (211) is opened on one set of diagonals of the mounting flange (21), and two mounting holes (211) are opened on the other set of diagonals of the mounting flange (21).

8. The composite material cylinder segment co-curing molding and demolding device according to claim 6, characterized in that, The mounting hole (211) is an oblong hole, and the mounting flange (21) is rectangular in shape. Each of the four corner points of the mounting flange (21) has a mounting hole (211).

9. The composite material cylindrical segment co-curing molding and demolding apparatus according to any one of claims 1-8, characterized in that, The forming groove is a rectangular groove or a circular groove.

10. The composite material cylindrical section co-curing molding and demolding device according to claim 1, characterized in that, The outer surface of the first mold (1) is coated with a release agent.

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