Large-angle honeycomb sandwich structure forming auxiliary device

Abstract

The utility model discloses an auxiliary forming device, belongs to the technical field of large-angle honeycomb sandwich structures, and particularly relates to the auxiliary forming device for the large-angle honeycomb sandwich structures, in the forming and curing process of the large-angle honeycomb sandwich structures, the viscosity of resin is gradually reduced along with the rising of temperature, so that the fluidity of the resin is increased, and the forming quality of the large-angle honeycomb sandwich structures is improved. Meanwhile, the friction coefficient between the prepreg and the honeycomb core is gradually reduced; a rubber auxiliary forming die with an inflation nozzle and a vacuum valve is manufactured, the auxiliary forming die is of a hollow structure, one side of the auxiliary forming die is matched with the honeycomb bevel angle of the large-angle honeycomb sandwich structure, and the other side of the auxiliary forming die is 10-20 degrees; the rubber auxiliary forming die can effectively balance the pressure difference in the chamfer curing process of the edge of the honeycomb core, reduce the lateral pressure of the honeycomb, avoid the slippage phenomenon of the honeycomb and ensure the quality of a large-angle honeycomb sandwich structure product through the friction force with the die and the breathable felt and the internal structural tension.

Description

Technical Field

[0001] This utility model discloses a molding auxiliary device, belonging to the technical field of large-angle honeycomb sandwich structure, specifically relating to a molding auxiliary device for large-angle honeycomb sandwich structure. Background Technology

[0002] In the aerospace field, honeycomb sandwich structures, as an important composite material structure, are widely used in aircraft and spacecraft manufacturing. This structure, formed by the curing of the panels, honeycomb core layer, and adhesives into a single unit, not only possesses excellent flexural stiffness but also effectively transmits shear forces. However, in practical applications, honeycomb sandwich structures face a challenge: increasing the cross-sectional height of the honeycomb core material makes connection with adjacent structures difficult. To solve this problem, a ramp transition is typically used to connect the sandwich structure to the laminate structure, thus forming a honeycomb beveled zone.

[0003] However, due to the influence of lateral compressive strength, interlayer friction coefficient, chamfering of the honeycomb core edge, and curing pressure difference, honeycomb slippage is prone to occur in the beveled area of ​​the honeycomb, resulting in compression deformation of the honeycomb core and wrinkling of the skin fiber. In particular, due to structural load-bearing and design space limitations, when the chamfering of the honeycomb core edge is designed to be greater than 25°, the honeycomb sandwich structure is very prone to slippage during curing, which seriously affects the quality of the product.

[0004] Therefore, based on the mechanism of honeycomb slippage, a method and auxiliary device for forming a large-angle honeycomb sandwich structure is proposed to avoid and improve the oblique angle slippage of the large-angle honeycomb sandwich structure, which is of great significance for improving the product quality of honeycomb sandwich structure components. Utility Model Content

[0005] Purpose of the utility model: To provide an auxiliary device for forming a large-angle honeycomb sandwich structure, and to solve the problems mentioned above.

[0006] Technical solution: A molding auxiliary device for a large-angle honeycomb sandwich structure, wherein the rubber auxiliary molding mold includes: a large-angle honeycomb sandwich structure, a rubber auxiliary molding mold, a breathable felt, a sealing strip, and a molding die;

[0007] In a further embodiment, the rubber auxiliary molding mold is mounted on the molding mold, the rubber auxiliary molding mold is a hollow structure forming an installation cavity, the large-angle honeycomb sandwich structure is mounted in the installation cavity of the rubber auxiliary molding mold, the breathable felt and the sealing strip are mounted between the rubber auxiliary molding mold and the molding mold, and the sealing strip is located on the outside of the breathable felt.

[0008] In a further embodiment, the mounting cavity of the rubber-assisted molding mold matches the surface of the large-angle honeycomb sandwich structure, one side of the rubber-assisted molding mold matches the honeycomb angle of the large-angle honeycomb sandwich structure, and the other side is tilted at 10°-20°.

[0009] In a further embodiment, the large-angle honeycomb sandwich structure has a honeycomb core structure inside.

[0010] In a further embodiment, the inner surface of the rubber-assisted molding mold is provided with a fiber reinforcement layer.

[0011] In a further embodiment, the surface of the rubber auxiliary molding mold is provided with an inflation nozzle and a vacuum valve. The inflation nozzle is installed on one side of the inclined edge of the rubber auxiliary molding mold, and the vacuum valve is installed on the bottom surface of the rubber auxiliary molding mold and connected to the breathable felt.

[0012] In a further embodiment, the rubber auxiliary molding mold has a structure that is narrow at the top and wide at the bottom, and an air cavity is provided at the connection between the upper and lower parts.

[0013] This utility model has the following beneficial effects:

[0014] 1. The rubber-assisted molding mold can effectively balance the pressure difference during the chamfering and curing process of the honeycomb core by using the friction between the mold and the breathable felt, as well as the internal structural tension. This reduces the lateral pressure on the honeycomb, prevents honeycomb slippage, and ensures the quality of large-angle honeycomb sandwich structure products.

[0015] 2. The rubber-assisted molding die is elastic and deformable, matching and compensating for errors in honeycomb processing and laying, and ensuring pressure transmission.

[0016] 3. Simple packaging reduces the risk of vacuum bag bridging.

[0017] 4. Rubber-assisted molding molds and molding dies are used to ensure the quality of the inner and outer surfaces of the large-angle honeycomb sandwich structure.

[0018] 5. The rubber auxiliary molding mold can be reused, reducing the consumption of auxiliary materials such as vacuum bags and lowering manufacturing costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the large-angle honeycomb sandwich structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the rubber auxiliary molding mold of this utility model.

[0021] Figure 3 This is a schematic diagram of the large-angle honeycomb sandwich structure packaging of this utility model.

[0022] Figure 4This is a schematic diagram of the use of the rubber auxiliary molding mold of this utility model.

[0023] Figure 5 This is a schematic diagram of the principle of the rubber-assisted molding mold of this utility model.

[0024] Figure reference numerals: 1. Large-angle honeycomb sandwich structure; 1.1. Honeycomb core; 2. Rubber auxiliary molding mold; 2.1. Inflation nozzle; 2.2. Vacuum valve; 3. Breathable felt; 4. Sealing strip; 5. Molding mold. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] A large-angle honeycomb sandwich structure forming auxiliary device includes: the rubber auxiliary forming mold 2 includes: a large-angle honeycomb sandwich structure 1, a rubber auxiliary forming mold 2, a breathable felt 3, a sealing strip 4, and a forming mold 5;

[0027] In one embodiment, such as Figures 1 to 5 As shown, the rubber auxiliary molding mold 2 is installed on the molding mold 5. The rubber auxiliary molding mold 2 has a hollow structure to form an installation cavity. The large-angle honeycomb sandwich structure 1 is installed in the installation cavity of the rubber auxiliary molding mold 2. The breathable felt 3 and the sealing strip 4 are installed between the rubber auxiliary molding mold 2 and the molding mold 5. The sealing strip 4 is located on the outside of the breathable felt 3.

[0028] In one embodiment, such as Figures 1 to 5 As shown, the mounting cavity of the rubber-assisted molding mold 2 matches the surface of the large-angle honeycomb sandwich structure 1. One side of the rubber-assisted molding mold 2 matches the honeycomb angle of the large-angle honeycomb sandwich structure, and the other side is inclined at 10°-20°.

[0029] In one embodiment, such as Figures 1 to 5 As shown, the interior of the large-angle honeycomb sandwich structure 1 is a honeycomb core 1.1 structure.

[0030] In one embodiment, such as Figures 1 to 5 As shown, the inner surface of the rubber-assisted molding mold 2 is provided with a fiber reinforcement layer.

[0031] In one embodiment, such as Figures 1 to 5As shown, the surface of the rubber auxiliary molding mold 2 is provided with an air inlet 2.1 and a vacuum valve 2.2. The air inlet 2.1 is installed on one side of the inclined side of the rubber auxiliary molding mold 2, and the vacuum valve 2.2 is installed on the bottom surface of the rubber auxiliary molding mold 2 and connected to the breathable felt 3.

[0032] In one embodiment, such as Figures 1 to 5 As shown, the rubber auxiliary molding mold 2 has a structure that is narrow at the top and wide at the bottom, and an air cavity is provided at the connection between the upper and lower parts.

[0033] In one embodiment, such as Figures 1 to 5 As shown, this utility model uses a rubber-assisted molding mold 2 with an inflation nozzle 2.1 and a vacuum valve 2.2. The rubber-assisted molding mold 2 has a hollow structure, with one side matching the honeycomb angle of the large-angle honeycomb sandwich structure, and the other side at 10°-20°.

[0034] In one embodiment, such as Figures 1 to 5 As shown, a rubber-assisted molding mold 2 is made on the inner surface of the large-angle honeycomb sandwich structure, which can increase the fiber reinforcement layer and ensure the shape.

[0035] In one embodiment, such as Figures 1 to 5 As shown, the rubber-assisted molding mold 2 is made of rubber material, which is elastic, deformable, and provides matching compensation to ensure a close fit. The rubber-assisted molding mold 2 is soft and deformable, facilitating demolding.

[0036] Working principle: The molding method of this utility model is as follows:

[0037] Step 1: Fabricate a rubber auxiliary molding mold, with its inner shape matching the inner surface of the large-angle honeycomb sandwich structure. Prefabricate the inflation nozzle and vacuum nozzle, and install the valves;

[0038] Step 2: Lay the large-angle honeycomb sandwich structure on the molding mold;

[0039] Step 3: Assemble the rubber auxiliary molding mold, pre-inflate the air nozzle and close the air valve, match and fit, and shape;

[0040] Step 4: Use sealing strips to seal the periphery of the rubber auxiliary molding mold with the molding mold, and check the vacuum through the vacuum valve of the rubber auxiliary molding mold;

[0041] Step 5: Open the inflation valve of the rubber auxiliary molding mold to connect the tank pressure, balance the internal and external pressure, and ensure pressure.

[0042] Step 6: The quality of the outer surface is ensured by the molding die, and the quality of the inner surface is ensured by the rubber-assisted molding die;

[0043] Step 7: Curing and demolding.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An auxiliary device for forming a large-angle honeycomb sandwich structure, characterized in that, include: Large-angle honeycomb sandwich structure, rubber auxiliary molding mold, breathable felt, sealing strip and molding die; The rubber auxiliary molding mold is installed on the molding mold. The rubber auxiliary molding mold has a hollow structure to form an installation cavity. The large-angle honeycomb sandwich structure is installed in the installation cavity of the rubber auxiliary molding mold. The breathable felt and the sealing strip are installed between the rubber auxiliary molding mold and the molding mold. The sealing strip is located on the outside of the breathable felt.

2. The auxiliary device for forming a large-angle honeycomb sandwich structure according to claim 1, characterized in that, The mounting cavity of the rubber-assisted molding mold matches the surface of the large-angle honeycomb sandwich structure. One side of the rubber-assisted molding mold matches the honeycomb angle of the large-angle honeycomb sandwich structure, while the other side is tilted at 10°-20°.

3. The auxiliary device for forming a large-angle honeycomb sandwich structure according to claim 1, characterized in that, The large-angle honeycomb sandwich structure has a honeycomb core structure inside.

4. The auxiliary device for forming a large-angle honeycomb sandwich structure according to claim 1, characterized in that, The inner surface of the rubber-assisted molding mold is provided with a fiber reinforcement layer.

5. The auxiliary device for forming a large-angle honeycomb sandwich structure according to claim 1, characterized in that, The surface of the rubber auxiliary molding mold is provided with an air inlet and a vacuum valve. The air inlet is installed on one side of the inclined side of the rubber auxiliary molding mold, and the vacuum valve is installed on the bottom surface of the rubber auxiliary molding mold and connected to the breathable felt.

6. The auxiliary device for forming a large-angle honeycomb sandwich structure according to claim 1, characterized in that, The rubber auxiliary molding mold has a structure that is narrow at the top and wide at the bottom, and an air cavity is provided at the connection between the upper and lower parts.

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