A forming device for air and space industry hollow structure composite material

Abstract

The utility model discloses a kind of forming devices for hollow structure composite material in aerospace and aviation industry, including air bag main part, the inside of air bag main part is provided with inflation assembly, air bag main part top bottom surface is provided with R angle area, the both ends of air bag main part are provided with the plane area connected with R angle area;The air bag main part includes high-temperature-resistant release rubber layer and high-temperature-resistant rigid structure, the high-temperature-resistant release rubber layer is located the outside of high-temperature-resistant rigid structure, the inflation assembly is connected with high-temperature-resistant release rubber layer;The utility model can guarantee the continuity of fiber to a great extent by structure core mould air bag in composite material forming, composite material prepreg or fiber can be directly laid on air bag surface, can provide maximum 3MPa internal pressure when structure core mould air bag in composite material forming, can realize the better surface performance of product, reduce subsequent processing procedure.

Description

Technical Field

[0001] This utility model relates to the field of hollow structure composite material molding technology, specifically a molding device for hollow structure composite materials used in the aerospace industry. Background Technology

[0002] Existing technologies for molding hollow composite materials in the aerospace industry mainly include winding process, pultrusion process, vacuum bag-assisted vacuum injection process, solid silicone mold-assisted molding process, rigid core mold-assisted molding process, silicone airbag-assisted molding process, soluble core mold process, and heat-shrinkable core mold airbag-assisted molding process.

[0003] In the aerospace industry, there are various molding processes for hollow composite materials, each with its own unique advantages and limitations. The following are the main drawbacks of these processes:

[0004] 1. Defects of the winding process: Shape limitations: It is mainly suitable for axisymmetric or simple-shaped products. Complex-shaped products are difficult to achieve using the winding process; Fiber orientation limitations: The fiber laying direction is restricted, making it difficult to achieve multi-directional reinforcement; Poor surface quality: The surface of the product is usually relatively rough and requires subsequent processing.

[0005] 2. Defects of pultrusion process: Limited shape: Primarily suitable for straight products with uniform cross-sectional shape; complex shapes are difficult to achieve through pultrusion; Restricted fiber orientation: Fibers are mainly arranged axially, resulting in lower transverse strength. High equipment cost: Pultrusion equipment is relatively complex, requiring a large initial investment.

[0006] 3. Defects of vacuum bag-assisted vacuum infusion process: Uneven resin distribution: The resin may be unevenly distributed in the fiber, resulting in insufficient local strength; Complex process: It requires precise control of vacuum degree and resin flow, with many process parameters and complicated operation.

[0007] 4. Defects in Solid Silicone Mold-Assisted Molding Process: Air Bubble Problem: Silicone molds are prone to generating air bubbles during the molding process, affecting product quality; Low Dimensional Accuracy: The thermal expansion of silicone molds may lead to low dimensional accuracy in the products; Short Mold Life: Silicone molds are prone to aging at high temperatures, resulting in a short service life.

[0008] 5. Defects of rigid core mold assisted molding process: Limited by complex shapes: Rigid core molds are difficult to adapt to products with complex shapes, making demolding difficult; High mold cost: The manufacturing and processing cost of rigid core molds is relatively high, especially for large-sized products; Heavy weight: Rigid core molds are usually heavy, increasing the difficulty of operation.

[0009] 6. Defects in Silicone Airbag-Assisted Molding Process: Structural limitations: For products with inconsistent thickness, it is difficult to provide the required pressure as designed; silicone airbags lack rigidity when uninflated, and prepreg or dry fiber materials can only be laid inside the steel mold, which cannot guarantee the fiber continuity of the composite product. Size limitations: For large-sized products, the manufacture and use of silicone airbags are difficult.

[0010] 7. Defects of soluble core mold process: Difficulty in material selection: Soluble core mold materials need to have specific solubility properties, which limits the selection of materials; Complex dissolution process: The core mold dissolution process needs to be precisely controlled, otherwise it may affect the quality of the product; Limitation on large products: For large products, the manufacturing and use of soluble core molds are difficult.

[0011] 8. Defects of heat shrink core mold airbag assisted molding process: Non-reusable: The heat shrink core mold cannot be reused after curing, which increases production costs. Utility Model Content

[0012] The purpose of this invention is to provide a molding device for hollow composite materials in the aerospace industry, so as to solve the existing problems mentioned in the background art.

[0013] To achieve the above objectives, this utility model provides the following technical solution: a molding device for hollow structural composite materials in the aerospace industry, comprising an airbag body, an inflation component disposed inside the airbag body, an R-angle region disposed on the top and bottom surfaces of the airbag body, planar regions connected to the R-angle regions disposed at both ends of the airbag body, and a structural core mold disposed inside the airbag body.

[0014] The airbag body includes a high-temperature resistant release rubber layer and a high-temperature resistant rigid structure. The high-temperature resistant release rubber layer is located on the outside of the high-temperature resistant rigid structure, and the inflation component is connected to the high-temperature resistant release rubber layer.

[0015] Preferably, the inflation assembly includes a connecting nozzle, an air nozzle, an air jet pipe, and a limiting block. The connecting nozzle is located on one side of the airbag body, and an air nozzle is provided on the inner side of the connecting nozzle. One side of the air nozzle extends into the interior of the airbag body and is provided with an air jet pipe. A limiting block connected to a high-temperature resistant release rubber layer is provided on the outer side of the air nozzle for inflating the airbag body.

[0016] Preferably, the high-temperature resistant release rubber layer is made of EPDM rubber, which has extremely low surface tension and very low surface energy, and a temperature resistance range of 120℃-220℃.

[0017] Preferably, the structural core mold is made of polymethacrylimide foam, which has a low density and excellent temperature resistance, and can still be used normally at 200°C.

[0018] Preferably, the connector is made of polyhexamethylene adipate, which has good high-temperature resistance.

[0019] Preferably, a sealing ring is provided on the outer side of the limiting block to improve the sealing performance of the connection point.

[0020] Compared with the prior art, the beneficial effects of this utility model are: the molding device for hollow structural composite materials in the aerospace industry;

[0021] 1. In the molding of composite materials, the prepreg or fiber of the composite material can be directly laid on the surface of the airbag, which can greatly ensure the continuity of the fiber.

[0022] 2. The structural mandrel airbag can provide a maximum internal pressure of 3MPa during composite material molding, which can achieve better surface properties of the product and reduce subsequent processing steps;

[0023] 3. The structural core mold airbag-assisted molding process can be used in conjunction with processes such as compression molding, injection molding, and autoclave molding, with low equipment investment;

[0024] 4. The lightweight internal structural core mold in the structural core mold airbag reduces the molding difficulty of large hollow composite material products;

[0025] 5. Due to the high deformation temperature of the structural core mold and the small dimensional change rate at high temperatures, it can be reused multiple times, greatly reducing the cost of use. Attached Figure Description

[0026] Figure 1 This is a perspective view of the present utility model;

[0027] Figure 2 This is the front sectional view of the present invention.

[0028] In the diagram: 1. Airbag body; 11. High-temperature resistant release rubber layer; 12. High-temperature resistant rigid structure; 2. Inflation component; 21. Connecting nozzle; 22. Air nozzle; 23. Air jet pipe; 24. Limiting block; 3. R-angle area; 4. Planar area; 5. Structural core mold. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-2 The present invention provides an embodiment of a molding device for hollow structural composite materials in the aerospace industry, comprising an airbag body 1, an inflation component 2 disposed inside the airbag body 1, a radius (R) corner region 3 disposed on the top and bottom surfaces of the airbag body 1, and planar regions 4 disposed at both ends of the airbag body 1 that are connected to the radius (R) corner region 3. The planar regions 4 need to be thickened at the positions where shaping is required to maintain dimensional stability. In the presence of radius (R) corner regions, due to the difference between the internal and external pressure areas and the pressure-bearing area, the areas need to be thinned according to the design. A structural core mold 5 is disposed inside the airbag body 1.

[0031] The airbag is designed with a hollow composite material structure, and its shape is scaled according to the thickness of the composite material wall. The scaling ratio is generally 0.6-0.8 of the composite material wall thickness. After the composite material is cured, there will be a gap of 0.2-0.4 of the composite material wall thickness. The airbag can be easily removed by using the gap.

[0032] The airbag body 1 includes a high-temperature resistant release rubber layer 11 and a high-temperature resistant rigid structure 12. The high-temperature resistant release rubber layer 11 is located on the outside of the high-temperature resistant rigid structure 12. The inflation component 2 is connected to the high-temperature resistant release rubber layer 11. The high-temperature resistant release rubber layer 11 is made of EPDM rubber. The rubber material has extremely low surface tension and very low surface energy, and its temperature resistance range is 120℃-220℃.

[0033] The inflation assembly 2 includes a connecting nozzle 21, an air nozzle 22, an air jet pipe 23, and a limiting block 24. The connecting nozzle 21 is located on one side of the airbag body 1. The connecting nozzle 21 is made of polyhexamethylene adipate, which has good high temperature resistance. The air nozzle 22 is provided on the inner side of the connecting nozzle 21. One side of the air nozzle 22 extends into the interior of the airbag body 1 and is provided with an air jet pipe 23. The limiting block 24, which is connected to the high temperature resistant release rubber layer 11, is provided on the outer side of the air nozzle 22. A sealing ring is provided on the outer side of the limiting block 24 to improve the sealing of the connection of the connecting nozzle 21. It is used to inflate the airbag body 1. By connecting the connecting nozzle 21 to the inflation device, the airflow can be delivered to the air jet pipe 23 and sprayed into the airbag body 1, causing the high temperature resistant release rubber layer 11 to expand.

[0034] Working principle: In the aerospace industry, when processing hollow composite materials, the composite material can be laid on the surface of the airbag body 1. Inflation component 2 is used to inflate the airbag body 1. At this time, the high temperature release rubber layer 11 expands to form the hollow structure shape of the composite material. After the composite material is cured, the airflow inside the high temperature release rubber layer 11 is discharged through the inflation component 2. At this time, the high temperature release rubber layer 11 can create a gap with the inside of the composite material, so the device can be easily removed.

[0035] The rigidity of the airbag body 1 is improved by the high-temperature resistant rigid structure 12, and the prepreg can be laid directly on the surface of the airbag. The structural core mold 5 has a high deformation temperature and a small high-temperature dimensional change rate, and can be reused multiple times.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A molding device for hollow structural composite materials in the aerospace industry, comprising an airbag body (1), characterized in that: An inflation component (2) is provided inside the airbag body (1). An R-corner area (3) is provided on the top and bottom surfaces of the airbag body (1). Planar areas (4) connected to the R-corner area (3) are provided at both ends of the airbag body (1). A structural core mold (5) is provided inside the airbag body (1). The airbag body (1) includes a high-temperature resistant release rubber layer (11) and a high-temperature resistant rigid structure (12). The high-temperature resistant release rubber layer (11) is located on the outside of the high-temperature resistant rigid structure (12), and the inflation component (2) is connected to the high-temperature resistant release rubber layer (11).

2. The molding apparatus for hollow structural composite materials in the aerospace industry according to claim 1, characterized in that: The inflation assembly (2) includes a connecting nozzle (21), an air nozzle (22), an air jet pipe (23), and a limiting block (24). The connecting nozzle (21) is located on one side of the airbag body (1). An air nozzle (22) is provided on the inner side of the connecting nozzle (21). One side of the air nozzle (22) extends into the interior of the airbag body (1) and is provided with an air jet pipe (23). A limiting block (24) connected to a high-temperature release rubber layer (11) is provided on the outer side of the air nozzle (22).

3. The molding apparatus for hollow structural composite materials in the aerospace industry according to claim 1, characterized in that: The high-temperature resistant release rubber layer (11) is made of EPDM rubber.

4. The molding apparatus for hollow structural composite materials in the aerospace industry according to claim 1, characterized in that: The structural core mold (5) is made of polymethacrylimide foam.

5. A molding apparatus for hollow structural composite materials in the aerospace industry according to claim 2, characterized in that: The connector (21) is made of polyhexamethylene adipate.

6. A molding apparatus for hollow structural composite materials in the aerospace industry according to claim 2, characterized in that: A sealing ring is provided on the outer side of the limiting block (24).

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