Core mold structure

Abstract

The utility model belongs to the technical field of composite material manufacturing, and discloses a core mold structure. The core mold structure comprises a collapsible core mold body, the interior of the collapsible core mold body is hollow, and the collapsible core mold body can be supported on the inner wall of a cavity of a hollow stringer; the collapsible core mold body can deform to be separated from the cavity of the hollow stringer. The core mold structure can support the inner surface of the cap-shaped stringer cavity in the co-bonding and curing process of the cap-shaped stringer and the wall plate, the problem that the whole cap-shaped stringer wall plate product has quality defects due to the fact that the pressure at the position is inconsistent with that at other positions is solved, the cap-shaped stringer wall plate is convenient to disassemble after being formed, and the production efficiency is improved. And the finished product quality and the manufacturing efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of composite material manufacturing, in particular to a core mold structure. Background Art

[0002] Carbon fiber composite materials are widely used in many fields due to their advantages such as light weight, high strength, fatigue resistance and corrosion resistance. Hat-shaped long-beam reinforced wall panels are an important form of achieving lightweight carbon fiber composite structures. The hat-shaped long-beam reinforced wall panels formed by the autoclave co-bonding process have the following difficulties in manufacturing: a closed trapezoidal cavity is formed inside the cured hat-shaped long beam, and the lower surface of the trapezoidal cavity is uncured prepreg, which has uneven pressure distribution. The subsequent wall panels are prone to wrinkle defects during the curing process with the prepreg, affecting product quality.

[0003] In order to ensure that the curing pressure in the cavity of the hat-shaped long stringer reinforced wall panel is consistent with the external surface pressure, the tubular vacuum bag method is commonly used for manufacturing. The tubular vacuum bag process can improve the curing quality of the carbon fiber prepreg at the angle formed by the chamfer of the bonding surface of the hat-shaped long stringer and the wall panel ply to a certain extent, but certain quality defects will still occur during the product manufacturing process. First, the angle formed by the inner inclined surface of the hat-shaped long stringer and the wall panel ply is generally less than 90°. The process materials such as the demoulding cloth, isolation film and breathable felt have a certain thickness. The vacuum bag film cannot completely fit the inner wall of the cavity of the hat-shaped long stringer reinforced wall panel. The carbon fiber prepreg at the angle will still have defects such as wrinkles during the curing process. Secondly, the hat-shaped long stringer is a slender strip with a narrow internal cavity. It is impossible to accurately control whether the tubular vacuum bag is smooth and neat inside the cavity, which makes the operation difficult and time-consuming. Finally, the tubular vacuum bag is prone to damage during the pressurized expansion process. Once damaged, the entire hat-shaped long girder reinforced wall panel will face the risk of being scrapped, and the yield rate cannot be guaranteed.

[0004] Therefore, a core mold structure is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a core mold structure, which can support the inner surface of the hat-shaped long girder cavity during the gluing and curing process of the hat-shaped long girder and the wall panel, so as to prevent the pressure here from being inconsistent with other positions and causing quality defects in the entire hat-shaped long girder wall panel product. The core mold structure is easy to disassemble after the hat-shaped long girder wall panel is formed, which is beneficial to improving the quality of the finished product and manufacturing efficiency.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The core mold structure includes:

[0008] A collapsible core mold body, wherein the collapsible core mold body is hollow inside and can be supported on the inner wall of the cavity of the hollow long stringer;

[0009] The collapsible core mold body can be deformed to escape from the cavity of the hollow stringer.

[0010] As a preferred solution of the core mold structure provided by the utility model, the collapsible core mold body includes an outer supporting layer, a prepreg layer and an inner supporting layer, the prepreg layer is sandwiched between the outer supporting layer and the inner supporting layer, and the inner supporting layer is surrounded to form a penetration space.

[0011] As a preferred solution of the core mold structure provided by the utility model, the outer supporting layer and the inner supporting layer are both unvulcanized silicone rubber layers.

[0012] As a preferred solution of the core mold structure provided by the utility model, the prepreg layer includes a plurality of strip prepreg members which are spaced apart from each other and sandwiched between the outer supporting layer and the inner supporting layer, and the strip prepreg members are arranged along the length direction of the collapsible core mold body.

[0013] As a preferred solution of the core mold structure provided by the utility model, the strip-shaped prepreg piece is a carbon fiber fabric sheet.

[0014] As a preferred solution of the core mold structure provided by the utility model, the core mold structure further includes an isolation membrane, and the isolation membrane is coated on the outside of the collapsible core mold body.

[0015] Beneficial effects of the utility model:

[0016] The core mold structure provided by the utility model includes a collapsible core mold body, which is hollow inside and can be supported on the inner wall of the cavity of the hollow long stringer; the collapsible core mold body can be deformed to escape from the cavity of the hollow long stringer. In other words, the collapsible core mold body can support the inner wall of the cavity of the hollow long stringer, and during the process of gluing and curing the hollow long stringer and the wall panel, the inner surface of the cavity of the hollow long stringer is supported to prevent the pressure here from being inconsistent with other positions, which may cause quality defects in the entire long stringer wall panel product. The collapsible core mold body can be deformed, that is, after the hollow long stringer and the wall panel are fixedly formed, the collapsible core mold body can escape from the cavity of the hollow long stringer by deformation, which is convenient for disassembly and is conducive to improving the quality of the finished product and manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the use of the core mold structure provided by the embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the core mold structure provided by an embodiment of the utility model.

[0019] In the figure:

[0020] 10. Collapsible core mold body; 11. External support layer; 12. Internal support layer; 13. Strip prepreg material;

[0021] 20. Wear space;

[0022] 30. Isolation film. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0027] Figure 1 The schematic diagram of the use of the core mold structure provided by the embodiment of the utility model is shown. Figure 1 , this embodiment provides a core mold structure.

[0028] Specifically, the collapsible core mold body 10 is hollow inside and can support the inner wall of the cavity of the hollow long stringer, and the collapsible core mold body 10 can be deformed to escape from the cavity of the hollow long stringer. Through the above arrangement, when the hollow long stringer no longer needs to be supported by the collapsible core mold body 10, the volume of the collapsible core mold body 10 can be reduced for easy disassembly.

[0029] Figure 2 A schematic diagram showing the core mold structure provided by an embodiment of the utility model is shown. Figure 2 The collapsible core mold body 10 includes an outer support layer 11, a prepreg layer and an inner support layer 12. The prepreg layer is sandwiched between the outer support layer 11 and the inner support layer 12, and the inner support layer 12 is surrounded to form a penetration space 20. A volume-variable auxiliary component, such as a tubular vacuum bag, etc., can be penetrated in the penetration space 20. Its volume is increased, and the collapsible core mold body 10 can be supported from the inside, ensuring the reliability of the collapsible core mold body 10 supporting the inside of the hollow long stringer.

[0030] As an option, the outer support layer 11 and the inner support layer 12 are both uncured silicone rubber layers. Uncured silicone rubber has strong plasticity and can be cured to form a silicone rubber core mold structure with a stable shape, that is, a collapsible core mold body 10, after being treated with high temperature and high pressure.

[0031] Specifically, the prepreg layer includes a plurality of strip-shaped prepreg pieces 13 which are arranged at intervals from each other and are sandwiched between the outer support layer 11 and the inner support layer 12. The strip-shaped prepreg pieces 13 are arranged along the length direction of the collapsible core mold body 10.

[0032] In this embodiment, the strip prepreg 13 can be specifically a carbon fiber fabric sheet. Adding the carbon fiber fabric sheet between the soft outer support layer 11 and the soft inner support layer 12 can effectively improve the rigidity of the collapsible core mold body 10, keep the soft silicone rubber core mold structure straight and stable, and enable the collapsible core mold body 10 to collapse in a preset deformation mode during demolding, which is convenient for demolding.

[0033] Specifically, in this embodiment, there are eight strip-shaped prepreg pieces 13, and the eight strip-shaped prepreg pieces 13 are evenly distributed between the inner supporting layer 12 and the outer supporting layer 11. That is, two strip-shaped prepreg pieces 13 are respectively arranged at the top, bottom and opposite sides of the inner supporting layer 12 to support the outer supporting layer 11, ensure the uniformity of the force of the outer supporting layer 11 and the inner supporting layer 12, and reduce the number of the strip-shaped prepreg pieces 13 as much as possible.

[0034] More specifically, the core mold structure further includes an isolation film 30, which is coated on the outside of the collapsible core mold body 10. When the core mold structure is used to manufacture a long stringer wall panel, the isolation film 30 is first coated on the outside of the collapsible core mold body 10, and then placed in the cavity of the hollow long stringer. Through the above arrangement, it is convenient to remove the collapsible core mold body 10 after the long stringer wall panel is formed.

[0035] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. The core mold structure is characterized by: include: A collapsible core mold body (10), the interior of the collapsible core mold body (10) being hollow and capable of being supported on the inner wall of the cavity of a hollow long stringer; The collapsible core mold body (10) is capable of deforming to escape from the cavity of the hollow long stringer; The collapsible core mold body (10) comprises an outer supporting layer (11), a prepreg layer and an inner supporting layer (12), wherein the prepreg layer is sandwiched between the outer supporting layer (11) and the inner supporting layer (12), and the inner supporting layer (12) is surrounded to form a penetration space (20).

2. The core mold structure according to claim 1, characterized in that: The outer supporting layer (11) and the inner supporting layer (12) are both unvulcanized silicone rubber layers.

3. The core mold structure according to claim 1, characterized in that: The prepreg layer comprises a plurality of strip-shaped prepreg pieces (13) which are arranged at intervals from each other and are sandwiched between the outer supporting layer (11) and the inner supporting layer (12); the strip-shaped prepreg pieces (13) are arranged along the length direction of the collapsible core mold body (10).

4. The core mold structure according to claim 3, characterized in that: The strip-shaped prepreg piece (13) is a carbon fiber fabric sheet.

5. The core mold structure according to any one of claims 1 to 4, characterized in that: The core mold structure further comprises an isolation membrane (30), wherein the isolation membrane (30) is coated on the outside of the collapsible core mold body (10).

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