Integrated molding method of composite material skin, covering cap and opening frame

Abstract

The invention provides a composite material skin, covering cap and covering frame integrated forming method which comprises the following steps: firstly, performing covering cap marking on a corresponding junction of a covering cap and a skin on a mold, and taking the covering cap and the skin as a reference when the covering cap and the skin are paved; then, positioning blocks are arranged on the mold, and the mouth frame can be laid on the upper surface of the skin on the basis; then, carbon fiber prepreg blanking is carried out; laser is used for projecting the laying layer position and the laying reference of the carbon fiber prepreg; covering layer laying is conducted, and covering cap layer laying is conducted synchronously; after the skin and the covering cap are laid, positioning the position of the positioning block by laser projection, and laying the covering frame prepreg by taking the positioning block as a laying reference; then curing is carried out; and finally, removing the coating material, and taking down the opening cover. On the premise that the product precision is guaranteed, the machining and adapting procedures added due to independent forming of the covering cap and the covering frame are avoided, the production cost of the product is reduced, and the production period is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite material manufacturing, and particularly relates to a method for integrally forming a composite skin, an access panel, and an access frame. Background Art

[0002] Lightweight carbon fiber composite materials have the advantages of light weight, high strength, and designability, and are widely used in aerospace structures. As Figure 2 shown, in the prior art, common composite skin and access panel products are formed separately for the skin, the access panel, and the access frame. Since mold design needs to be carried out separately, processes such as product production and product trimming are required during the production process. Therefore, the processes are relatively cumbersome, there are many part transfer processes, and it takes a long time. In addition, there are certain fitting requirements for the access panel and the access frame, resulting in time-consuming and laborious part fitting processes, and the resulting time cost, economic cost, and labor cost are relatively large. Therefore, it is necessary to carry out process innovation to avoid product transfer and operation risks caused by numerous processes, improve work efficiency, and reduce production costs. Summary of the Invention

[0003] In view of this, the present invention aims to overcome the defects in the prior art and proposes a method for integrally forming a composite skin, an access panel, and an access frame.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A method for integrally forming a composite skin, an access panel, and an access frame includes the following steps:

[0006] S1. Perform access panel scribing at the junction of the access panel and the skin on the mold, and use this as a reference when laying the access panel and the skin;

[0007] S2. Set positioning blocks on the mold, and use this as a reference for laying the access frame on the upper surface of the skin;

[0008] S3. Cut the carbon fiber prepreg;

[0009] S4. Use laser projection to project the laying position and laying reference of the carbon fiber prepreg;

[0010] S5. Lay the skin according to the laying projection line in step S4, synchronously lay the access panel, and also lay the access panel;

[0011] S6. After the skin and the access panel are laid, use laser projection to position the position of the positioning block, and use the positioning block as a laying reference to lay the access frame prepreg;

[0012] S7. Cure according to the curing system required by the curing performance of the prepreg;

[0013] S8. Remove the covering material and take off the access panel.

[0014] Furthermore, in step S3, after cutting the carbon fiber prepreg, classify and place the prepreg according to the shape and number of the prepreg blocks, and mark the quantity.

[0015] Furthermore, in step S5, before laying the access panel, first lay a release film at the access panel position on the mold.

[0016] Furthermore, in step S5, lay the access panel prepreg along the scribed line of the access panel on the mold. During the laying process, perform covering and compaction. After the compaction is completed, check the laying quality. Iron out the wrinkles and then proceed with the subsequent prepreg laying.

[0017] Furthermore, in step S5, use a vacuum bag for covering and compaction during the laying.

[0018] Furthermore, in step S6, perform vacuum compaction during the laying process.

[0019] Furthermore, in step S7, monitor the entire curing process and record the curing process.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The integrated molding method of composite skin, access panel, and access frame provided by the present invention avoids the additional processing and fitting processes caused by separately molding the access panel and access frame, reduces the production cost of the product, saves the production cycle, and at the same time avoids the product transfer and operation risks caused by numerous processes, on the premise of ensuring the product accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings that form a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic diagram when the molding method of the present invention is implemented;

[0024] Figure 2 is a flowchart of a conventional molding method in the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0028] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0029] A method for integrally forming a composite skin, access panel, and access frame is as Figure 1 shown, and includes the following steps:

[0030] S1. Perform access panel scribing at the junction of the access panel 1 and the skin 2 on the mold, which serves as a reference when laying the access panel and the skin.

[0031] S2. Set positioning blocks 3 on the mold, and the access frame 6 can be laid on the upper surface of the skin based on this.

[0032] S3. Cut the carbon fiber prepreg.

[0033] S4. Use laser projection to project the laying position and laying reference of the carbon fiber prepreg.

[0034] S5. Lay the skin layer according to the laying projection line in step S4, synchronously lay the access panel layer, and also lay the access panel layer;

[0035] S6. After the skin and access panel layers are completed, use laser projection to position the position of the positioning block, and use the positioning block as the laying reference to lay the access frame prepreg.

[0036] S7, curing, the curing system is: the product uses high temperature curing prepreg, the mold temperature is used for temperature control during curing, the room temperature is heated to 130℃ for insulation, and the temperature is raised to 180℃ for the second stage of insulation after the insulation is completed, and the temperature is lowered after the insulation is completed. The entire curing process is in a vacuum pressure state;

[0037] S8. Remove the covering material and take off the cover.

[0038] In step S3, after the carbon fiber prepregs are cut, the prepregs are classified and placed according to the shapes and numbers of the prepreg blocks, and the quantities are marked.

[0039] In step S5, before the flap is laid, an isolation film 4 is laid on the flap of the mold. In an optional embodiment, an isolation sheet 5 is arranged between the flap and the skin. For example, the isolation sheet can be an aluminum sheet. The isolation sheet can be arranged on the inner side of the isolation film. Due to the blue isolation film and the isolation sheet barrier, the flap can be easily demoulded. The flap frame is directly connected to the body, so demoulding is not required.

[0040] In step S5, the flap prepreg is laid along the flap score line on the mold, and the layering is compacted. After the compaction is completed, the laying quality is checked, and the subsequent prepreg laying is carried out after the wrinkles are ironed out.

[0041] In step S5, the ply is coated and compacted using a vacuum bag.

[0042] In step S6, vacuum compaction is performed during the paving process.

[0043] In step S7, the curing process is monitored throughout and the curing process is recorded.

[0044] The invention provides an integrated molding method for a skin, a mouth frame and a mouth cover. When the skin is molded, the mouth frame and the mouth cover are also molded, and the mouth cover and the skin are laid in corresponding layers. By applying the method of the invention, the mouth cover and the skin have a better matching relationship, and no subsequent processing steps are required, thereby avoiding appearance errors caused by the separate molding of each structure, reducing the adaptation process between parts, reducing product production costs, reducing product production cycles, reducing parts circulation processes, avoiding product circulation and operation risks caused by numerous processes, and improving the comprehensive performance of the product.

[0045] The present invention provides a method for integrally forming a skin, a frame, and a cover. The frame and the cover are formed while the skin is being formed, and the cover and the skin are laid up correspondingly. In this solution, the cooperation relationship between the cover and the skin is good, no post-processing is required, the external shape processing caused by separate forming is avoided, the fitting process between parts is reduced, the production cost of the product is lowered, the production cycle of the product is shortened, the part transfer process is reduced, the product transfer and operation risks caused by numerous processes are avoided, and the comprehensive performance of the product is improved.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite material skin, mouth cover, mouth frame integrated molding method, characterized in that: The steps include: S1. Mark the mouth cover at the junction of the mouth cover and the skin on the mold, and use this as a reference when laying the mouth cover and the skin; S2. Setting a positioning block on the mold, and laying the mouth frame on the upper surface of the skin with the positioning block as a reference; S3, cutting carbon fiber prepreg for skin, mouth cover and mouth frame; S4. Using laser projection to project the carbon fiber prepreg ply position and laying benchmark; S5, laying out the skin according to the projection line in step S4, and laying out the flap simultaneously; S6. After the skin and mouth cover are laid, the positioning block is positioned by laser projection, and the mouth frame prepreg is laid with the positioning block as the laying reference; S7, curing; S8. Remove the covering material and take off the cover.

2. A composite material skin, mouth cover, and mouth frame integrated molding method according to claim 1, characterized in that: In step S3, after the carbon fiber prepregs are cut, the prepregs are classified and placed according to the shapes and numbers of the prepreg blocks, and the quantities are marked.

3. The method for integrated molding of composite material skin, mouth cover and mouth frame according to claim 1, characterized in that: In step S5, before the cover is laid, a release film is laid on the mold cover.

4. The method for integrated molding of composite material skin, mouth cover and mouth frame according to claim 1, characterized in that: In step S5, the flap prepreg is laid along the flap score line on the mold, and the layering is compacted. After the compaction is completed, the laying quality is checked, and the subsequent prepreg laying is carried out after the wrinkles are ironed out.

5. The method for integrated molding of composite material skin, mouth cover and mouth frame according to claim 1, characterized in that: In step S5, the ply is coated and compacted using a vacuum bag.

6. The method for integrated molding of composite material skin, mouth cover and mouth frame according to claim 1, characterized in that: In step S6, vacuum compaction is performed during the paving process.

7. The method for integrated molding of composite material skin, mouth cover and mouth frame according to claim 1, characterized in that: In step S7, the curing process is monitored throughout and the curing process is recorded.

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