Cap-type stringer co-bonding process wall plate core mold and preparation method of cap-type stringer co-bonding process wall plate core mold
Through the hat-shaped long stringer co-bonding process and the assembly method of foam core mold and vacuum bag, the problem of insufficient strength of traditional core mold materials was solved, and high-quality molding and low-cost production of composite reinforced wall panels were achieved.
Patent Information
- Application Number
- CN202511070574.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-09-12
AI Technical Summary
During the bonding process between the long stringer and the skin, traditional core mold materials have insufficient strength and poor heat resistance, and deform after curing or have a complex water-soluble process, which leads to uneven pressure on the skin surface and affects the molding quality of the composite reinforced wall panels.
The hat-shaped long stringer co-bonding process is adopted. By designing the assembly method of the foam core mold, tubular vacuum bag, peelable cloth and isolation film, the sealing and pressurization effect of the vacuum bag are ensured, the risk of inclusion is avoided, and uniform pressurization of the skin is achieved.
The molding quality of composite reinforced wall panels is improved, production costs and operating difficulties are reduced, production efficiency is improved, and material waste is reduced, with higher reliability and environmental sustainability.
Smart Images
Figure CN120620518A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of wall panel core moulds, and in particular to a hat-shaped long-beam co-bonding process wall panel core mould and a preparation method thereof. Background Art
[0002] Composite materials, due to their lightweight and high-strength properties, have found widespread application in a variety of fields, including aerospace, automotive, and construction. In aerospace, composite reinforced panels, a typical integrated structure, are manufactured through a co-bonding or co-curing process of stringers and skins. This significantly reduces the number of connecting fasteners and significantly improves the mechanical properties of the panels. This structure is widely used in major load-bearing components such as aircraft fuselages, wings, and tailplanes.
[0003] However, insufficient pressure within the stringer cavity during the gluing process can lead to uneven pressure on the skin surface, resulting in quality issues such as fiber wrinkling. The molding quality of these structural components is difficult to control, so the stringer cavity must be filled with a core mold material to uniformly pressurize the skin. The use of core molds is a key technology in the manufacturing of composite reinforced panels. The design and material selection of the core mold have a significant impact on the molding process and the quality of the final product.
[0004] At present, for the co-bonding technology of complex wall panels, the traditional process route is to install the core mold into the long stringer during the bonding process, or to insert the core mold into the tubular vacuum bag after the bag making is completed, prop it up, and complete the bag making. Common core mold materials include foam core molds and water-soluble core molds. When choosing a process route for curing the core mold and the wall panel together, the foam core mold has the advantages of low density, good compression resistance, and is easy to process and demold. However, it may have problems with insufficient strength and heat resistance. After curing, the core mold deforms and cannot be used again, and the cost is slightly higher. The advantage of water-soluble core molds is that they can be removed by dissolving after the curing process, avoiding the demolding problem of traditional core molds. They are suitable for structural parts with complex shapes, but they have problems such as the complex and difficult water-soluble process.
[0005] If the core mold is removed after bagging is complete but before curing, the vacuum bag's pressurization effect on the skin may not be maintained properly, resulting in a decrease in the quality of the panel molding. In addition, if the core mold deforms during the curing process, it may directly affect the surface quality of the final product.
[0006] In view of this, the present invention is proposed. Summary of the Invention
[0007] The object of the present invention is to provide a hat-shaped long girder co-gluing process wall panel core mold and a preparation method thereof, so as to solve or improve the above technical problems.
[0008] The present invention can be achieved like this: In a first aspect, the present invention provides a method for preparing a core mold for a hat-shaped long-beam co-bonding process wall panel, comprising the following steps: Design the foam core mold according to the size that matches the hat-shaped long stringer cavity; Assembling the foam core mold with auxiliary materials: wherein the auxiliary materials include a tubular vacuum bag, a peelable cloth and an isolation film; the assembly process includes: laying the isolation film, the peelable cloth and the tubular vacuum bag in order from bottom to top, wrapping the isolation film around the tubular vacuum bag and fixing it, inserting the foam core mold into the tubular vacuum bag, sealing the isolation film corresponding to one end of the foam core mold and vacuuming the isolation film corresponding to the other end of the foam core mold.
[0009] In an optional embodiment, the distance between the two R corners of the hat-shaped long stringer - the length of the bottom side of the foam core mold is ≥3 mm.
[0010] In an optional embodiment, the length of the peelable cloth is ≤ the length of the bottom surface of the foam core mold.
[0011] In an optional embodiment, the width of the peelable cloth is 1 / 3 to 1 / 2 of the width of the tubular vacuum bag.
[0012] In an optional embodiment, the width of the peelable cloth is 1 / 2 of the width of the tubular vacuum bag.
[0013] In an alternative embodiment, the peelable cloth is centrally located on the bottom surface of the foam core mold.
[0014] In an optional embodiment, before the foam core mold is inserted into the tubular vacuum bag, the method further includes: wrapping an auxiliary isolation film on the surface of the foam core mold.
[0015] In an optional embodiment, the auxiliary isolation membrane is completely adhered to the surface of the foam core mold without wrinkles.
[0016] In an optional embodiment, the isolation membrane corresponding to the other end of the foam core mold is connected to the vacuum source through a one-way valve.
[0017] In a second aspect, the present invention provides a core mold for a hat-shaped long-beam co-gluing process wall panel, which is prepared by the preparation method of any one of the aforementioned embodiments.
[0018] The beneficial effects of the present invention include: The method for preparing a core mold for a hat-shaped long stringer co-bonding siding provided by this invention reduces the risk of contamination in the tubular vacuum bag by adjusting the assembly method of the foam core mold and tubular vacuum bag, enabling precise control of the tubular vacuum bag's dimensions. This simplifies the assembly process of the foam core mold and long stringer, reducing overall costs. This solution further optimizes the co-bonding process for complex siding panels, ensuring product quality while improving production efficiency and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0020] Figure 1 This is a schematic diagram of the assembly of the foam core mold and auxiliary materials in the preparation method provided by the present invention.
[0021] Icon: 1-Isolation film; 2-Peelable cloth; 3-Tubular vacuum bag; 4-Foam core mold. DETAILED DESCRIPTION
[0022] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer are used. Where the manufacturer of the reagents or instruments is not specified, all are conventional products that can be purchased commercially.
[0023] The following is a detailed description of the hat-shaped long girder co-bonding process wall panel core mold and its preparation method provided by the present invention.
[0024] The method for preparing a core mold for a hat-shaped long girder co-bonding process wall panel provided by the present invention comprises the following steps: S1: Design the foam core mold 4 according to the size that matches the hat-shaped long stringer cavity.
[0025] Factors that primarily influence panel forming quality include the distance between the core mold side and the stringer cap waist, and the size of the core mold base. The closer the core mold base is to the distance between the two rounded corners of the stringer, the better the pressure applied to the skin. However, the ease of core mold removal must be considered. This invention, designed for hyperbolic stringer core molds, sets the distance between the two rounded corners of the cap-shaped stringer to a value equal to or greater than 3mm, which ensures panel skin quality while reducing the risk of difficulty in removing the foam core mold.
[0026] S2: Assemble the foam core mold 4 with auxiliary materials.
[0027] The assembly diagram of the foam core mold 4 and the auxiliary materials is as follows Figure 1 The auxiliary materials include a tubular vacuum bag 3, a peelable cloth 2 and an isolation film 1.
[0028] The assembly process includes: laying the isolation film 1, the peelable cloth 2 and the tubular vacuum bag 3 in order from bottom to top, wrapping the isolation film 1 around the tubular vacuum bag 3 and fixing it, inserting the foam core mold 4 into the tubular vacuum bag 3, sealing the isolation film 1 corresponding to one end of the foam core mold 4 and vacuuming the isolation film 1 corresponding to the other end of the foam core mold 4.
[0029] The above method is to assemble auxiliary materials such as tubular vacuum bag 3, peelable cloth 2, isolation film 1 and foam core mold 4. After assembly, the isolation film 1 is vacuumed, and the isolation film 1 is used as a vacuum bag to fix the tubular auxiliary materials on the surface of the core mold by vacuuming for shaping. This method can avoid the problem of the core mold and the tubular vacuum bag 3 being mixed during the assembly of the long stringer, and can reduce the cost of the core mold, which has an important impact on improving the quality of the wall panel and increasing production efficiency.
[0030] In some optional embodiments, the assembly can be performed as follows: S21: Prepare auxiliary materials such as the foam core mold 4, tubular vacuum bag 3, peelable cloth 2, and isolation film 1. Lay the tubular vacuum bag 3 flat on the work surface to ensure it is smooth and wrinkle-free. Cut the isolation film 1 to the size of the tubular vacuum bag 3, ensuring that the size of the isolation film 1 is not smaller than the size of the tubular vacuum bag 3.
[0031] In some optional embodiments, the isolation film 1 can just completely wrap the tubular vacuum bag 3 .
[0032] S22: Laying the peelable cloth 2 on the isolation film 1.
[0033] In some optional embodiments, the length of the peelable cloth 2 is less than or equal to the bottom length of the foam core mold 4 to ensure that the peelable cloth 2 is always located in the bag during the subsequent bag making process to avoid air leakage.
[0034] In some optional embodiments, the width of the peelable cloth 2 is 1 / 3 to 1 / 2 of the width of the tubular vacuum bag 3. If the width of the peelable cloth 2 is too wide, the quality of the internal corners on both sides will be affected. In some preferred embodiments, the width of the peelable cloth 2 is 1 / 2 of the width of the tubular vacuum bag 3.
[0035] In some typical embodiments, the peelable cloth 2 is centrally located on the bottom surface of the foam core mold 4. The peelable cloth 2 is a dry peelable cloth 2.
[0036] S23: Lay the tubular vacuum bag 3 flat on the isolation film 1, then wrap both sides of the isolation film 1 and fix them with pressure-sensitive tape to ensure that the tubular vacuum bag 3 is tightly attached to the isolation film 1. During this operation, avoid damaging the isolation film 1.
[0037] S24: Insert the foam core mold 4 into the tubular vacuum bag 3.
[0038] In some optional embodiments, before the foam core mold 4 is inserted into the tubular vacuum bag 3, the foam core mold 4 is further wrapped with an auxiliary isolation film 1. The auxiliary isolation film 1 is completely adhered to the surface of the foam core mold 4 without wrinkles. The auxiliary isolation film 1 can reduce friction between the foam core mold 4 and the tubular vacuum bag 3.
[0039] In some optional embodiments, after the foam core mold 4 is inserted into the tubular vacuum bag 3, the position of the auxiliary materials can be further arranged so that the peelable cloth 2 is centered on the bottom surface of the foam core mold 4; if there are excess auxiliary materials on both sides of the foam core mold 4, these auxiliary materials can be arranged to the sides of the foam core mold 4 and pleated.
[0040] S25: Use a sealing tape to seal the isolation membrane 1 corresponding to one end of the foam core mold 4 to ensure its sealing; and vacuum the isolation membrane 1 corresponding to the other end of the foam core mold 4.
[0041] In some optional embodiments, a plastic one-way valve can be fixed on the other side of the foam core mold 4. Before connecting the vacuum source, check that the isolation membrane 1 is sealed to ensure that there will be no air leakage during the vacuuming process. Connect the vacuum source to the one-way valve and vacuumize. During the vacuuming process, continuously organize the auxiliary materials to prevent wrinkles or damage.
[0042] S26: After the vacuuming is completed, the vacuum source is removed to obtain the core mold of the hat-shaped long girder co-bonding process wall panel.
[0043] It should be noted that during the co-bonding process, the qualified hat-shaped long stringer co-bonding process wall panel core mold prepared above can be placed into the long stringer, the position of the core mold can be adjusted, and the long stringer can be positioned. After the wall panel bonding and bagging are completed, the core mold can be pulled out. This allows the auxiliary material to maintain the shape of the core mold while avoiding inclusions, thereby achieving a more ideal pressurization effect of the tubular vacuum bag 3. The specific operations of the co-bonding process in the present invention can be referred to the relevant technologies in the prior art and will not be described in detail here.
[0044] Correspondingly, the present invention provides a hat-shaped long-beam co-gluing process wall panel core mold, which is prepared by the above-mentioned preparation method.
[0045] The features and performance of the present invention are further described in detail below with reference to the embodiments.
[0046] Example 1 This embodiment provides a hat-shaped long-beam co-gluing process wall panel core mold, the preparation process of which includes the following steps: S1: Design the foam core mold 4 according to the size that matches the hat-shaped long stringer cavity.
[0047] The distance between the two R corners of the hat-shaped long stringer - the length of the bottom side of the foam core mold 4 is 3mm.
[0048] S2: Assemble the foam core mold 4 with auxiliary materials.
[0049] S21: Prepare the foam core mold 4 designed in S1, as well as auxiliary materials such as the tubular vacuum bag 3, the peelable fabric 2, and the isolation film 1. Lay the tubular vacuum bag 3 flat on the work surface, ensuring it is smooth and wrinkle-free. Cut the isolation film 1 to the size of the tubular vacuum bag 3 so that it completely covers the tubular vacuum bag 3.
[0050] S22: Laying the peelable cloth 2 on the isolation film 1.
[0051] The peelable cloth 2 is a dry peelable cloth 2, which is centered on the bottom surface of the foam core mold 4. That is, the length of the peelable cloth 2 is less than the bottom surface length of the foam core mold 4, and the width of the peelable cloth 2 is 1 / 2 of the width of the tubular vacuum bag 3.
[0052] S23: Lay the tubular vacuum bag 3 flat on the isolation film 1, then wrap both sides of the isolation film 1 and fix them with pressure-sensitive tape to ensure that the tubular vacuum bag 3 is tightly attached to the isolation film 1. During this operation, avoid damaging the isolation film 1.
[0053] S24: Wrap the surface of the foam core mold 4 with an auxiliary isolation film 1, which is completely adhered to the surface of the foam core mold 4 without wrinkles; insert the foam core mold 4 into the tubular vacuum bag 3; after the foam core mold 4 is inserted into the tubular vacuum bag 3, arrange the position of the auxiliary materials so that the peelable cloth 2 is centered on the bottom surface of the foam core mold 4; if there are excess auxiliary materials on both sides of the foam core mold 4, arrange these auxiliary materials to the side of the foam core mold 4 and pleat them.
[0054] S25: Use a sealing strip to seal the isolation membrane 1 corresponding to one end of the foam core mold 4. Fix a plastic one-way valve to the other end of the foam core mold 4. Before connecting the vacuum source, check whether the isolation membrane 1 is sealed intact to ensure that there will be no air leakage during the vacuuming process. Connect the vacuum source to the one-way valve and vacuumize. During the vacuuming process, continuously organize the auxiliary materials to prevent them from wrinkling or being damaged.
[0055] S26: After the vacuuming is completed, the vacuum source is removed to obtain the core mold of the hat-shaped long girder co-bonding process wall panel.
[0056] Example 2 This embodiment provides a hat-shaped long-beam co-gluing process wall panel core mold, the preparation process of which includes the following steps: S1: Design the foam core mold 4 according to the size that matches the hat-shaped long stringer cavity.
[0057] The distance between the two R corners of the hat-shaped long stringer - the length of the bottom side of the foam core mold 4 is 3.5mm.
[0058] S2: Assemble the foam core mold 4 with auxiliary materials.
[0059] S21: Prepare the foam core mold 4 designed in S1, as well as auxiliary materials such as the tubular vacuum bag 3, the peelable fabric 2, and the isolation film 1. Lay the tubular vacuum bag 3 flat on the work surface, ensuring it is smooth and wrinkle-free. Cut the isolation film 1 to the size of the tubular vacuum bag 3 so that it completely covers the tubular vacuum bag 3.
[0060] S22: Laying the peelable cloth 2 on the isolation film 1.
[0061] The peelable cloth 2 is a dry peelable cloth 2, which is located on the bottom surface of the foam core mold 4. The length of the peelable cloth 2 is less than the bottom length of the foam core mold 4, and the width of the peelable cloth 2 is 1 / 3 of the width of the tubular vacuum bag 3.
[0062] S23: Lay the tubular vacuum bag 3 flat on the isolation film 1, then wrap both sides of the isolation film 1 and fix them with pressure-sensitive tape to ensure that the tubular vacuum bag 3 is tightly attached to the isolation film 1. During this operation, avoid damaging the isolation film 1.
[0063] S24: Wrap the surface of the foam core mold 4 with an auxiliary isolation film 1, which is completely adhered to the surface of the foam core mold 4 without wrinkles; insert the foam core mold 4 into the tubular vacuum bag 3; after the foam core mold 4 is inserted into the tubular vacuum bag 3, arrange the position of the auxiliary materials so that the peelable cloth 2 is centered on the bottom surface of the foam core mold 4; if there are excess auxiliary materials on both sides of the foam core mold 4, arrange these auxiliary materials to the side of the foam core mold 4 and pleat them.
[0064] S25: Use a sealing strip to seal the isolation membrane 1 corresponding to one end of the foam core mold 4. Fix a plastic one-way valve to the other end of the foam core mold 4. Before connecting the vacuum source, check whether the isolation membrane 1 is sealed intact to ensure that there will be no air leakage during the vacuuming process. Connect the vacuum source to the one-way valve and vacuumize. During the vacuuming process, continuously organize the auxiliary materials to prevent them from wrinkling or being damaged.
[0065] S26: After the vacuuming is completed, the vacuum source is removed to obtain the core mold of the hat-shaped long girder co-bonding process wall panel.
[0066] That is, the difference between this embodiment and embodiment 1 is that: in S1, the distance between the two R corners of the hat-shaped long stringer is different - the length of the bottom side of the foam core mold 4. In S22, the position of the peelable cloth 2 is different.
[0067] Example 3 This embodiment provides a hat-shaped long-beam co-gluing process wall panel core mold, the preparation process of which includes the following steps: S1: Design the foam core mold 4 according to the size that matches the hat-shaped long stringer cavity.
[0068] The distance between the two R corners of the hat-shaped long stringer - the length of the bottom side of the foam core mold 4 is 4 mm.
[0069] S2: Assemble the foam core mold 4 with auxiliary materials.
[0070] S21: Prepare the foam core mold 4 designed in S1, as well as auxiliary materials such as the tubular vacuum bag 3, the peelable fabric 2, and the isolation film 1. Lay the tubular vacuum bag 3 flat on the work surface, ensuring it is smooth and wrinkle-free. Cut the isolation film 1 to the size of the tubular vacuum bag 3 so that it completely covers the tubular vacuum bag 3.
[0071] S22: Laying the peelable cloth 2 on the isolation film 1.
[0072] The peelable cloth 2 is a dry peelable cloth 2, which is centered on the bottom surface of the foam core mold 4. That is, the length of the peelable cloth 2 is less than the bottom surface length of the foam core mold 4, and the width of the peelable cloth 2 is 1 / 2 of the width of the tubular vacuum bag 3.
[0073] S23: Lay the tubular vacuum bag 3 flat on the isolation film 1, then wrap both sides of the isolation film 1 and fix them with pressure-sensitive tape to ensure that the tubular vacuum bag 3 is tightly attached to the isolation film 1. During this operation, avoid damaging the isolation film 1.
[0074] S24: inserting the foam core mold 4 into the tubular vacuum bag 3; after the foam core mold 4 is inserted into the tubular vacuum bag 3, arranging the position of the auxiliary materials so that the peelable cloth 2 is centered on the bottom surface of the foam core mold 4.
[0075] S25: Use a sealing strip to seal the isolation membrane 1 corresponding to one end of the foam core mold 4. Fix a plastic one-way valve to the other end of the foam core mold 4. Before connecting the vacuum source, check whether the isolation membrane 1 is sealed intact to ensure that there will be no air leakage during the vacuuming process. Connect the vacuum source to the one-way valve and vacuumize. During the vacuuming process, continuously organize the auxiliary materials to prevent them from wrinkling or being damaged.
[0076] S26: After the vacuuming is completed, the vacuum source is removed to obtain the core mold of the hat-shaped long girder co-bonding process wall panel.
[0077] That is, the difference between this embodiment and embodiment 1 is that in S1, the distance between the two R corners of the hat-shaped long stringer is different from the length of the bottom side of the foam core mold 4. In S24, the foam core mold 4 is not wrapped with the auxiliary isolation film 1 before being inserted into the tubular vacuum bag 3.
[0078] In summary, the solution provided by the present invention has at least the following advantages: (1) After the foam core mold 4 is used for shaping, the risk of inclusion of the tubular vacuum bag 3 can be basically avoided, and the size of the tubular vacuum bag 3 can be accurately controlled, ensuring that the vacuum bag can uniformly pressurize the skin during the curing process, thereby improving the overall quality of the product; (2) The present invention reduces the cost of core molds. Each wall panel of different size and structure only requires one set of core molds to complete the manufacture of the entire wall panel, which reduces the replacement frequency and greatly reduces the production cost; (3) The assembly method of the foam core mold 4 and the tubular vacuum bag 3 proposed in the present invention can be used directly after the bag making process is completed in the production preparation process, thereby reducing the difficulty of operation and time consumption, and further improving production efficiency; (4) The core mold and vacuum bag assembly technology of the present invention reduces the risk of inclusions and improves molding quality, resulting in higher reliability of the final product; (5) The implementation of the present invention not only improves production efficiency and product quality, but also makes a positive contribution to environmental sustainability by reducing material waste and optimizing production processes.
[0079] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.
Claims
1. A method for preparing a core mold for a hat-shaped long girder co-bonding process wall panel, characterized in that: The following steps are involved: Design the foam core mold according to the size that matches the hat-shaped long stringer cavity; Assemble the foam core mold with auxiliary materials: wherein the auxiliary materials include a tubular vacuum bag, a peelable cloth and an isolation film; the assembly process includes: laying the isolation film, the peelable cloth and the tubular vacuum bag in order from bottom to top, wrapping the tubular vacuum bag with the isolation film and fixing it, inserting the foam core mold into the tubular vacuum bag, sealing the isolation film corresponding to one end of the foam core mold and vacuuming the isolation film corresponding to the other end of the foam core mold.
2. The preparation method according to claim 1, characterized in that The distance between the two R corners of the hat-shaped long stringer - the length of the bottom edge of the foam core mold ≥ 3mm.
3. The preparation method according to claim 1, characterized in that The length of the peelable cloth is less than or equal to the bottom length of the foam core mold.
4. The preparation method according to claim 1, characterized in that The width of the peelable cloth is 1 / 3 to 1 / 2 of the width of the tubular vacuum bag.
5. The preparation method according to claim 4, characterized in that The width of the peelable cloth is 1 / 2 of the width of the tubular vacuum bag.
6. The preparation method according to claim 1, characterized in that The peelable cloth is centrally located on the bottom surface of the foam core mold.
7. The preparation method according to claim 1, characterized in that Before the foam core mold is inserted into the tubular vacuum bag, the method further includes: wrapping an auxiliary isolation film on the surface of the foam core mold.
8. The preparation method according to claim 7, characterized in that The auxiliary isolation membrane is completely adhered to the surface of the foam core mold without wrinkles.
9. The preparation method according to claim 1, characterized in that The isolation membrane corresponding to the other end of the foam core mold is connected to the vacuum source through a one-way valve.
10. A core mold for a hat-shaped long girder co-bonding process wall panel, characterized in that: The product is prepared by the preparation method according to any one of claims 1 to 9.