Supporting structure of inner cavity of carbon fiber part and forming method

Abstract

The invention discloses a supporting structure of an inner cavity of a carbon fiber part. The supporting structure comprises an air pipe, a core part, an embedded part and a fixing part. The surface of the air pipe, the surface of the core part and the surface of the fixing part are all coated with demolding layers. The core body part is fixed with the peripheral side surface of the air pipe in a fitting and contact manner; the embedded part is fixed on the peripheral side surface of the core body part; one end of the fixing piece abuts against the inner embedded piece, and the fixing piece is matched with the core body piece to limit the inner embedded piece. An air pipe, a core part, an embedded part and a fixing part are fixedly assembled together, then the surface of the air pipe, the core part, the embedded part and the fixing part are coated with at least one layer of carbon fiber cloth in a matched mode, the air pipe, the core part, the embedded part and the fixing part are placed in a mold, mold closing and pressing are conducted, hot air is blown to the air pipe to form a carbon fiber part structure, and after the air pipe, the core part, the embedded part and the fixing part are taken down, the carbon fiber part with an inner cavity can be obtained. The preparation method is simple, the forming time is short, the supporting structure can be taken out without being soaked and loosened, and the large consumption of labor and time cost is avoided.

Description

Technical Field

[0001] The present invention relates to the field of carbon fiber molding technology, and in particular to a support structure for the inner cavity of a carbon fiber part and a molding method. Background Art

[0002] Carbon fiber refers to high-strength and high-modulus fibers with a carbon content of over 90%. It has the best high-temperature resistance of all chemical fibers. It is made from acrylic and viscose fibers through high-temperature oxidation and carbonization. Carbon fiber is an excellent material for manufacturing high-tech equipment such as aerospace. Mainly composed of carbon elements, carbon fiber has the characteristics of high-temperature resistance, anti-friction, thermal conductivity and corrosion resistance. It is fibrous and soft in appearance and can be processed into various fabrics. Because its graphite microcrystalline structure is preferentially oriented along the fiber axis, it has high strength and modulus along the fiber axis. The main use of carbon fiber is as a reinforcing material combined with resins, metals, ceramics and carbon to manufacture advanced composite materials. Carbon fiber reinforced epoxy resin composites have the highest specific strength and specific modulus among existing engineering materials.

[0003] At present, the main molding processes for carbon fiber composite materials are: injection molding, vacuum induction, pressure tank and compression molding. Due to the difficulty of preparing the mold and the demoulding method, the carbon fiber composite parts produced by these molding processes are mostly rod-shaped or rod-shaped products with simple structures, and it is difficult to mold products with an inner cavity. Most of the existing technologies use a water-soluble inner core as a support. For example, Chinese patent CN202310982672 discloses a method for molding carbon fiber special-shaped parts with a large inner cavity and a small outer mouth. It uses an organic solvent to form a thin film on the surface of a water-soluble support inner core, soaks it in water after molding, waits for the inner core to loosen and soften, then takes out the inner core, and leaves the outer film, and finally molds to form an inner cavity. This method is complicated to operate and takes a long time to mold, resulting in a waste of labor and time costs. Therefore, it is necessary to propose a new solution to solve the above problems. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies in the prior art, and its main purpose is to provide a support structure and molding method for the inner cavity of a carbon fiber part, which can effectively solve the problem that the existing preparation method of carbon fiber products with an inner cavity is complex, the molding time is long, and a large amount of labor and time costs are consumed.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A support structure for the inner cavity of a carbon fiber component comprises an air duct, a core component, an embedded component, and a fixing component; the surfaces of the air duct, the core component, and the fixing component are all coated with a release layer; the core component is in contact with and fixed to the peripheral side surface of the air duct; the embedded component is fixed to the peripheral side surface of the core component; one end of the fixing component contacts the embedded component, and the fixing component and the core component cooperate to limit the embedded component.

[0007] As a preferred solution, a slot is provided on the peripheral side surface of the core member, and the slot matches and is fixed to the peripheral side surface of the air duct.

[0008] As a preferred solution, the slot is an arc-shaped slot, which increases the contact area between the slot and the air duct and makes the fit more firm and reliable.

[0009] As a preferred solution, a limiting groove is provided on the peripheral side surface of the core member, and the embedded member is embedded in the limiting groove to be fixed and limited.

[0010] As a preferred solution, a first fixing hole is provided on the embedded part, and a second fixing hole is provided on the fixing part to cooperate with the external fixing mechanism. The second fixing hole is a through hole and is directly connected to the first fixing hole.

[0011] As a preferred solution, the first fixing hole and the second fixing hole are both screw holes, and the external fixing mechanism is a screw. Fixing by screws can make the limiting effect of the fixing member on the embedded body more reliable.

[0012] As a preferred solution, the core member is made of silicone material.

[0013] A method for forming an inner cavity of a carbon fiber part comprises the following steps:

[0014] (1) A release agent is pre-applied on the surfaces of the air duct, core member and fixing member to form a release layer;

[0015] (2) The core member is fixedly attached to the peripheral side of the air duct, and the embedded member is fixed to the peripheral side of the core member. Then, one end of the fixing member is brought into contact with the embedded member. The fixing member and the core member cooperate with each other to limit the embedded member, thereby forming a support structure for the inner cavity of the carbon fiber member.

[0016] (3) coating the support structure of the inner cavity of the carbon fiber component obtained in step (2) with at least one layer of carbon fiber cloth, then placing it in a molding die, pressing it, and using hot air to blow it into an air duct to form it, thereby obtaining a carbon fiber component structure;

[0017] (4) Remove the air duct, core part, embedded parts and fixing parts from the carbon fiber part structure obtained in step (3) to obtain a carbon fiber part with an inner cavity.

[0018] As a preferred solution, the hot air temperature in step (2) is 140-150° C., and the duration of the hot air is 60 minutes.

[0019] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0020] By fixing the air duct, core part, embedded part and fixing part together, and then covering at least one layer of carbon fiber cloth on the surface, placing it in a mold, closing the mold and pressing, and blowing hot air to the air duct to form a carbon fiber part structure, after removing the air duct, core part, embedded part and fixing part, a carbon fiber part with an inner cavity can be obtained. The preparation method is simple and the molding time is short. The supporting structure can be taken out without soaking and loosening, and will not cause a large amount of labor and time costs.

[0021] To more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of an assembly perspective view of a preferred embodiment of the present invention;

[0023] Figure 2 It is an exploded view of a preferred embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of a preferred embodiment of the present invention;

[0025] Figure 4 It is a three-dimensional schematic diagram of the carbon fiber component structure of the present invention;

[0026] Figure 5 is a schematic three-dimensional diagram of a carbon fiber member with an inner cavity in the present invention;

[0027] Figure 6 4 is a cross-sectional view of a carbon fiber member having an inner cavity according to the present invention.

[0028] Description of the accompanying drawings:

[0029] 10. Air duct 20. Core parts

[0030] 21. Card slot 22. Limit slot

[0031] 30. Embedded part 31. First fixing hole

[0032] 40. Fixing piece 41. Second fixing hole. DETAILED DESCRIPTION

[0033] Please refer to Figures 1 to 3 As shown, it shows the specific structure of a preferred embodiment of the present invention, including an air duct 10, a core member 20, an embedded member 30 and a fixing member 40; the surface of the air duct 10, the surface of the core member 20 and the surface of the fixing member 40 are all coated with a release layer (not shown in the figure).

[0034] The core member 20 is in contact with and fixed to the peripheral side surface of the air duct 10; in this embodiment, a card slot 21 is provided on the peripheral side surface of the core member 20, and the card slot 21 matches and is fixed with the peripheral side surface of the air duct 10. Specifically, the card slot 21 is an arc-shaped groove, which makes the contact area between the card slot 21 and the air duct 10 larger and the fit is more firm and reliable; in addition, a limiting groove 22 is provided on the peripheral side surface of the core member 20; and the core member 20 is made of silicone material.

[0035] The embedded component 30 is fixed on the peripheral side of the core component 20. In this embodiment, the embedded component 30 is embedded in the limiting groove 22 for fixed position. A first fixing hole 31 is formed on the embedded component 30, and the first fixing hole 31 is a screw hole.

[0036] One end of the fixing part 40 is in conflict with the embedded part 30, and the fixing part 40 cooperates with the aforementioned core part 20 to limit the embedded part 30; in this embodiment, a second fixing hole 41 that cooperates with the external fixing mechanism is opened on the fixing part 40, and the second fixing hole 41 is a through hole and is directly connected to the first fixing hole 31. The second fixing hole 41 is a screw hole, and the external fixing mechanism is a screw. Fixing by the screw can make the limiting effect of the fixing part 40 on the embedded body 30 more reliable.

[0037] The present invention also discloses a method for forming an inner cavity of a carbon fiber part, comprising the following steps:

[0038] (1) A release agent is pre-applied on the surfaces of the air duct, core member and fixing member to form a release layer.

[0039] (2) The core member is fitted and fixed to the peripheral side surface of the air duct, and then the embedded member is fixed to the peripheral side surface of the core member. Next, one end of the fixing member is brought into contact with the embedded member. The fixing member and the aforementioned core member cooperate with each other to limit the embedded member, so as to form a supporting structure for the inner cavity of the aforementioned carbon fiber member.

[0040] (3) The support structure of the inner cavity of the carbon fiber component obtained in step (2) is covered with at least one layer of carbon fiber cloth, and then placed in a molding mold for pressing and blown into an air duct using hot air to form a carbon fiber component structure; specifically, the hot air temperature is 140-150° C., and the duration of the hot air is 60 minutes.

[0041] (4) Remove the air duct, core part, embedded parts and fixing parts from the carbon fiber part structure obtained in step (3) to obtain a carbon fiber part with an inner cavity.

[0042] The key design feature of this invention is that by assembling the duct, core component, embedded component, and fixing component together, and then covering its surface with at least one layer of carbon fiber cloth, placing it in a mold, pressing it with the mold closed, and blowing hot air onto the duct to form a carbon fiber component structure, a carbon fiber component with an inner cavity can be obtained after removing the duct, core component, embedded component, and fixing component. The preparation method is simple, the molding time is short, and the support structure can be removed without soaking and loosening, thus avoiding a large amount of labor and time costs.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A support structure for the inner cavity of a carbon fiber part, characterized in that: It includes an air duct, a core member, an embedded member and a fixing member; the surfaces of the air duct, the core member and the fixing member are all coated with a demoulding layer; the core member is in contact with and fixed to the peripheral side of the air duct; the embedded member is fixed to the peripheral side of the core member; one end of the fixing member is in contact with the embedded member, and the fixing member and the core member cooperate with each other to limit the embedded member.

2. The support structure for the inner cavity of a carbon fiber component according to claim 1, characterized in that: A clamping groove is provided on the peripheral side surface of the core member, and the clamping groove matches and is fixed with the peripheral side surface of the air duct.

3. The support structure of the inner cavity of the carbon fiber component according to claim 2, characterized in that: The clamping slot is an arc-shaped slot.

4. The support structure for the inner cavity of a carbon fiber member according to claim 1, characterized in that: A limiting groove is arranged on the peripheral side surface of the core member, and the embedded member is embedded in the limiting groove for fixed limiting.

5. The support structure for the inner cavity of a carbon fiber component according to claim 1, characterized in that: The embedded part is provided with a first fixing hole, and the fixing part is provided with a second fixing hole matched with the external fixing mechanism. The second fixing hole is a through hole and is directly connected with the first fixing hole.

6. The support structure for the inner cavity of a carbon fiber member according to claim 5, characterized in that: The first fixing hole and the second fixing hole are both screw holes, and the external fixing mechanism is a screw.

7. The support structure for the inner cavity of a carbon fiber member according to claim 1, characterized in that: The core member is made of silicone material.

8. A method for forming an inner cavity of a carbon fiber part, characterized in that: The following steps are included: (1) A release agent is pre-applied on the surfaces of the air duct, the core member and the fixing member to form a release layer; (2) The core member is fixedly contacted with the peripheral side of the air duct, and then the embedded member is fixed on the peripheral side of the core member. Then, one end of the fixing member is abutted against the embedded member, and the fixing member and the core member cooperate with each other to limit the embedded member, so as to form a support structure for the inner cavity of the carbon fiber member according to any one of claims 1 to 7; (3) coating the support structure of the inner cavity of the carbon fiber component obtained in step (2) with at least one layer of carbon fiber cloth, then placing it in a molding mold for pressing and using hot air to blow into an air duct to form it, thereby obtaining a carbon fiber component structure; (4) Remove the air duct, core part, embedded parts and fixing parts from the carbon fiber part structure obtained in step (3) to obtain a carbon fiber part with an inner cavity.

9. The method for forming the inner cavity of a carbon fiber part according to claim 1, characterized in that: The hot air temperature in step (2) is 140-150° C., and the duration of the hot air is 60 minutes.

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