A T-shaped composite part layup structure and method

Abstract

The application relates to the field of aircraft composite material manufacturing and discloses a T-shaped composite material part laying forming structure and method, which respectively utilize a first forming die, a second forming die, a lower forming die, a plate on the T-shaped composite material part, a second L-shaped assembly and a first L-shaped assembly; the first L-shaped assembly and the second L-shaped assembly are combined back to form a T-shaped preformed body; the first forming die with the plate is placed on the lower forming die, the plate is combined with the transverse top surface of the T-shaped preformed body to form the T-shaped preformed body; and the T-shaped preformed body is formed into the overall structure of the T-shaped composite material part by using a preset forming process. The T-shaped composite material part laying forming structure and method have good processability, can not only reduce the difficulty of putty strip filling and rolling and pressing of an operator, avoid the appearance of twisted core material indentation on the surface of the plate on the T-shaped bottom surface, but also well control the thickness of the T-shaped composite material part, and improve the part manufacturing efficiency and quality.

Description

Technical Field

[0001] This invention relates to the field of aircraft composite material manufacturing, and discloses a T-shaped composite material part laying and molding structure and method. Background Technology

[0002] T-shaped composite materials are one of the most common types of composite reinforcement structures, widely used in composite paneling, ribs, and beams. Typically, two L-shaped products are first laid out, then pressed back-to-back together using a mold to form a T. Twisted core strips are then filled into the gaps at the rounded corners of the two L-shaped products. Finally, a strip is laid on the bottom surface of the T-shape. This traditional laying and forming method requires high precision in the filling and rolling of the twisted core strips; otherwise, raised marks on the putty strips on the bottom surface of the T-shape are easily caused. Summary of the Invention

[0003] The purpose of this invention is to provide a T-shaped composite material part laying and molding structure and method, which can reduce the requirements for operators to fill and roll the twisted core strip, and improve the surface quality of the T-shaped bottom strip plate.

[0004] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: A T-shaped composite material part layup molding structure, wherein the T-shaped composite material part includes a strip plate, a first L-shaped component, and a second L-shaped component, the first L-shaped component and the second L-shaped component being back-to-back bonded to form a T-shaped preform, and the strip plate being fixed to the transverse top surface of the T-shaped preform to form a T-shaped composite material part; characterized in that the T-shaped composite material part layup molding structure includes: The lower forming mold includes an upper horizontal surface and a lower horizontal surface, and a vertical surface is provided between the upper horizontal surface and the lower horizontal surface for forming a first L-shaped component through the upper horizontal surface and the vertical surface; The first forming mold includes a first contact surface that can be placed on the lower horizontal surface, and a first forming surface for forming the strip plate, wherein the first contact surface is perpendicular to the first forming surface; The second molding die includes a second contact surface that can be placed on the upper horizontal surface, and a second molding surface that is perpendicular to the second contact surface. The second contact surface and the second molding surface are used to combine and mold the second L-shaped component, and the second molding surface is arranged facing the first molding surface.

[0005] Furthermore, a first limiting block is provided on the upper horizontal surface, and a second limiting block is provided on the lower horizontal surface. The first molding die and the second molding die are disposed between the first limiting block and the second limiting block.

[0006] Furthermore, a first baffle is provided between the first molding surface and the second molding surface, and a second baffle is provided between the first molding surface and the vertical surface.

[0007] Furthermore, it also includes a third molding die, which includes a rigid die and a flexible layer attached to the outer wall of the rigid die; the surface of the second L-shaped component that contacts the second molding die is a third contact surface, and the flexible layer is used to adhere to the third contact surface.

[0008] To achieve the above technical effects, the present invention also provides a method for laying and molding T-shaped composite material parts, which is based on the aforementioned T-shaped composite material part laying and molding structure; the molding method includes: According to the design structure of the T-shaped composite material part, the strip plate of the T-shaped composite material part is formed on the first forming surface of the first forming mold; the second L-shaped component of the T-shaped composite material part is formed on the second contact surface and the second forming surface of the second forming mold. The lower molding die is placed horizontally, and the first L-shaped component of the T-shaped composite material part is formed on the upper horizontal and vertical surfaces; then the second molding die with the second L-shaped component is placed on the lower molding die, so that the first L-shaped component and the second L-shaped component are back-to-back to form a T-shaped preform; the first molding die with the strip plate is placed on the lower molding die, so that the strip plate is attached to the transverse top surface of the T-shaped preform. Using a preset molding process, the first L-shaped component, the second L-shaped component, and the strip are molded into an integral structure of a T-shaped composite material part.

[0009] Furthermore, a rounded transition section is provided at the connection between the two support plates forming the first L-shaped component or the second L-shaped component, and a cavity structure is formed in the rounded transition section inside the T-shaped composite material part, and the cavity structure is filled with core material.

[0010] Furthermore, the preset molding process is to heat and pressurize the material in an autoclave for curing.

[0011] Furthermore, the surface of the second L-shaped component that contacts the second molding mold is the third contact surface. Before hot pressing and curing, flexible layup material is sequentially laid on the rigid mold, so that the flexible layup material is cured on the surface of the rigid mold to form a flexible layer that can fit with the third contact surface. Then, the second molding mold is replaced with a rigid mold with a flexible layer, and then it is heated and pressurized in a hot autoclave for curing.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the T-shaped composite material parts laying and molding structure and method provided by the present invention have good processability, which not only reduces the difficulty for operators to fill and roll the putty strips, avoids the appearance of twisted core material indentations on the T-shaped bottom plate surface, but also effectively controls the circumferential thickness of the T-shaped composite material parts, thereby improving the manufacturing efficiency and quality of the parts. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the T-shaped composite material part laying and molding structure in Example 1 or 2; Figure 2 This is a schematic diagram of the structure of the lower molding die, the first molding die, and the second molding die in Example 1 or 2; Figure 3 This is a schematic diagram of the structure of the third molding die in Example 1 or 2; Figure 4 This is a schematic diagram showing the positional relationship between the third molding die and the T-shaped preform in Example 2; Among them, 1. T-shaped preform; 101. Strip plate; 102. First L-shaped component; 103. Second L-shaped component; 2. Lower forming mold; 201. Upper horizontal surface; 202. Lower horizontal surface; 203. Vertical surface; 3. First forming mold; 301. First contact surface; 302. First forming surface; 4. Second forming mold; 401. Second contact surface; 402. Second forming surface; 5. First limiting block; 6. Second limiting block; 7. First stop bar; 8. Second stop bar; 9. Third forming mold; 901. Hard mold; 902. Flexible layer; 903. Third contact surface; 10. Core material. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0015] Example 1 See Figures 1 to 3 A T-shaped composite material part layup molding structure, wherein the T-shaped composite material part includes a strip plate 101, a first L-shaped component 102, and a second L-shaped component 103, the first L-shaped component 102 and the second L-shaped component 103 being back-to-back bonded to form a T-shaped preform 1, and the strip plate 101 being fixed to the transverse top surface of the T-shaped preform 1 to form a T-shaped composite material part; characterized in that the T-shaped composite material part layup molding structure includes: The lower forming mold 2 includes an upper horizontal surface 201 and a lower horizontal surface 202, and a vertical surface 203 is provided between the upper horizontal surface 201 and the lower horizontal surface 202 for forming the first L-shaped component 102 through the upper horizontal surface 201 and the vertical surface 203; The first molding die 3 includes a first contact surface 301 that can be placed on the lower horizontal surface 202, and a first molding surface 302 for molding the strip plate 101, wherein the first contact surface 301 is perpendicular to the first molding surface 302. The second molding die 4 includes a second contact surface 401 that can be placed on the upper horizontal surface 201, and a second molding surface 402 that is perpendicular to the second contact surface 401. The second contact surface 401 and the second molding surface 402 are used to combine and mold the second L-shaped component 103, and the second molding surface 402 is arranged opposite to the first molding surface 302.

[0016] This embodiment describes a method for laying and molding T-shaped composite material parts using the above structure, including: According to the design structure of the T-shaped composite material part, the strip plate 101 of the T-shaped composite material part is formed on the first forming surface 302 of the first forming mold 3; the second L-shaped component 103 of the T-shaped composite material part is formed on the second contact surface 401 and the second forming surface 402 of the second forming mold 4. The lower molding mold 2 is placed horizontally, and the first L-shaped component 102 of the T-shaped composite material part is formed on the upper horizontal surface 201 and the vertical surface 203; then the second molding mold 4 with the second L-shaped component 103 is placed on the lower molding mold 2, so that the first L-shaped component 102 and the second L-shaped component 103 are back-to-back to form a T-shaped preform 1; the first molding mold 3 with the strip plate 101 is placed on the lower molding mold 2, so that the strip plate 101 is attached to the transverse top surface of the T-shaped preform 1; The first L-shaped component 102, the second L-shaped component 103, and the strip plate 101 are molded into an integral structure of a T-shaped composite material part using a preset molding process.

[0017] The T-shaped composite material parts laying and molding structure and method provided in this embodiment have good processability. It not only reduces the difficulty for operators to fill and roll the putty strips, avoids the appearance of indentations of the twisted core material 10 on the surface of the T-shaped bottom plate 101, but also effectively controls the circumferential thickness of the T-shaped composite material parts, thereby improving the manufacturing efficiency and quality of the parts.

[0018] Example 2 See Figures 1 to 4A method for laying and molding a T-shaped composite material part, the T-shaped composite material part including a strip plate 101, a first L-shaped component 102, and a second L-shaped component 103, the first L-shaped component 102 and the second L-shaped component 103 being back-to-back bonded to form a T-shaped preform 1, the strip plate 101 being fixed to the transverse top surface of the T-shaped preform 1 to form a T-shaped composite material part; the molding method includes: Step 1: Place the lower forming mold 2, which has an upper horizontal surface 201, a lower horizontal surface 202 and a vertical surface 203, horizontally, and form the first L-shaped component 102 of the T-shaped composite material part on the upper horizontal surface 201 and the vertical surface 203. Step 2: Based on the design structure of the T-shaped composite material part, form the strip plate 101 of the T-shaped composite material part on the first forming surface 302 of the first forming mold 3; In this embodiment, the first molding die 3 includes a first contact surface 301 that can be placed on the lower horizontal surface 202, and a first molding surface 302 for molding the strip plate 101, wherein the first contact surface 301 is perpendicular to the first molding surface 302.

[0019] Step 3: Form the second L-shaped component 103 of the T-shaped composite material part on the second contact surface 401 and the second forming surface 402 of the second forming mold 4; In this embodiment, the second molding die 4 includes a second contact surface 401 that can be placed on the upper horizontal surface 201, and a second molding surface 402 that is perpendicular to the second contact surface 401. The second contact surface 401 and the second molding surface 402 are used to combine and mold the second L-shaped component 103, and the second molding surface 402 is arranged opposite to the first molding surface 302.

[0020] In this embodiment, the molding process of steps one to three all adopts the prepreg laying process. It should be ensured that the laying is flat and wrinkle-free. Then, a vacuum bag is made and vacuumed to compact it.

[0021] Step 4: Place the second molding mold 4, which has the second L-shaped component 103 formed, on the lower molding mold 2, so that the first L-shaped component 102 and the second L-shaped component 103 are back-to-back to form a T-shaped preform 1; place the first molding mold 3, which has the strip plate 101 formed, on the lower molding mold 2, so that the strip plate 101 is in contact with the transverse top surface of the T-shaped preform 1. To prevent slippage of the first molding mold 3 and the second molding mold 4 after bonding, this embodiment provides a first limiting block 5 on the upper horizontal surface 201 and a second limiting block 6 on the lower horizontal surface 202. The first molding mold 3 and the second molding mold 4 are positioned between the first limiting block 5 and the second limiting block 6 to avoid affecting the molding quality of the T-shaped composite material parts due to slippage.

[0022] In this embodiment, a rounded transition section is provided at the connection between the two support plates forming the first L-shaped component 102 or the second L-shaped component 103. A cavity structure is formed inside the T-shaped composite material part within the rounded transition section, and the cavity structure is filled with core material 10. The core material 10 can be prepreg twisted yarn (the filling amount of core material 10 is calculated based on the gap volume). During the filling process, a hot air gun is used to heat and soften the twisted yarn while a scraper is used to roll and press it to ensure that the gap is filled tightly without voids.

[0023] Step 5: Using the preset molding process, the first L-shaped component 102, the second L-shaped component 103, and the strip plate 101 are molded into an integral structure of a T-shaped composite material part; In this embodiment, the T-shaped preform 1 formed by the bonded assembly tooling, the first L-shaped component 102, the second L-shaped component 103, and the strip plate 101 is pushed into a hot autoclave for heating and pressurization to solidify and form.

[0024] In this embodiment, during the bonding process of the first L-shaped component 102, the second L-shaped component 103, and the strip 101, a silicone rubber thickness control strip (such as the first strip 7, the second strip 8, and the third strip set between the second contact surface 401 and the upper horizontal surface 201) is placed at each of the three end faces of the T-shaped preform 1 to prevent the preform from becoming thinner due to glue overflow during pressure curing.

[0025] The T-shaped composite material part laying and molding result in this embodiment also includes a third molding mold 9, which includes a rigid mold 901 and a flexible layer 902 attached to the outer wall of the rigid mold 901. The surface of the second L-shaped component 103 that contacts the second molding mold 4 is the third contact surface 903, and the flexible layer 902 is used to adhere to the third contact surface 903. In specific applications, the rigid mold 901 is a rigid structure that can provide stable support for the third contact surface 903 of the second L-shaped component 103, ensuring the molding accuracy of the third contact surface 903 during the molding process. The flexible layer 902 attached to the outer wall of the rigid mold 901 has good flexibility and adhesion, and can closely adhere to the third contact surface 903 of the second L-shaped component 103, ensuring that the third contact surface 903 does not suffer from poor molding quality due to uneven stress during the curing process.

[0026] The processing method of the third molding mold 9 is as follows: Before hot pressing and curing, the shape and size of the rigid mold 901 are determined according to the structure of the second L-shaped component; flexible layup material is sequentially laid on the rigid mold 901, so that the flexible layup material is cured on the surface of the rigid mold 901 to form a flexible layer 902 that can be adhered to the third contact surface 903, and finally an L-shaped third molding mold 9 is formed; when entering the pressure curing process, the second molding mold 4 is replaced with the rigid mold 901 with the flexible layer 902, and the T-shaped preform 1 is heated and pressure-cured in the autoclave.

[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A T-shaped composite material part lay-up molding structure, the T-shaped composite material part comprising a strip plate (101), a first L-shaped component (102), and a second L-shaped component (103), the first L-shaped component (102) and the second L-shaped component (103) being back-to-back bonded to form a T-shaped preform (1), the strip plate (101) being fixed to the transverse top surface of the T-shaped preform (1) to form a T-shaped composite material part; characterized in that, T-shaped composite material parts layup and molding structures include: The lower forming mold (2) includes an upper horizontal surface (201) and a lower horizontal surface (202), and a vertical surface (203) is provided between the upper horizontal surface (201) and the lower horizontal surface (202) for forming the first L-shaped component (102) through the upper horizontal surface (201) and the vertical surface (203); The first molding die (3) includes a first contact surface (301) that can be placed on the lower horizontal plane (202) and a first molding surface (302) for molding the strip plate (101), wherein the first contact surface (301) is perpendicular to the first molding surface (302); The second molding die (4) includes a second contact surface (401) that can be placed on the upper horizontal surface (201) and a second molding surface (402) that is perpendicular to the second contact surface (401). The second contact surface (401) and the second molding surface (402) are used to combine and mold the second L-shaped component (103), and the second molding surface (402) is arranged opposite to the first molding surface (302).

2. The T-shaped composite material part laying and molding structure according to claim 1, characterized in that, A first limiting block (5) is provided on the upper horizontal surface (201), and a second limiting block (6) is provided on the lower horizontal surface (202). The first molding die (3) and the second molding die (4) are disposed between the first limiting block (5) and the second limiting block (6).

3. The T-shaped composite material part laying and molding structure according to claim 1, characterized in that, A first baffle (7) is provided between the first molding surface (302) and the second molding surface (402), and a second baffle (8) is provided between the first molding surface (302) and the vertical surface (203).

4. The T-shaped composite material part laying and molding structure according to claim 1, characterized in that, It also includes a third molding die (9), which includes a rigid die (901) and a flexible layer (902) attached to the outer wall of the rigid die (901); the surface of the second L-shaped component (103) that contacts the second molding die (4) is the third contact surface (903), and the flexible layer (902) is used to be attached to the third contact surface (903).

5. A method for laying and molding T-shaped composite material parts, the method being based on the T-shaped composite material parts laying and molding structure according to any one of claims 1-4; characterized in that, The molding method includes: According to the design structure of the T-shaped composite material part, the strip plate (101) of the T-shaped composite material part is formed on the first forming surface (302) of the first forming mold (3); the second L-shaped component (103) of the T-shaped composite material part is formed on the second contact surface (401) and the second forming surface (402) of the second forming mold (4); The lower molding die (2) is placed horizontally, and the first L-shaped component (102) of the T-shaped composite material part is formed on the upper horizontal surface (201) and the vertical surface (203); then the second molding die (4) with the second L-shaped component (103) is placed on the lower molding die (2), so that the first L-shaped component (102) and the second L-shaped component (103) are back-to-back to form a T-shaped preform (1); the first molding die (3) with the strip plate (101) is placed on the lower molding die (2), so that the strip plate (101) is attached to the transverse top surface of the T-shaped preform (1); The first L-shaped component (102), the second L-shaped component (103), and the strip plate (101) are molded into an integral structure of a T-shaped composite material part using a preset molding process.

6. The method for laying and molding T-shaped composite material parts according to claim 5, characterized in that, A rounded transition section is provided at the connection between the two support plates forming the first L-shaped component (102) or the second L-shaped component (103). A cavity structure is formed in the rounded transition section inside the T-shaped composite material part, and the cavity structure is filled with core material (10).

7. The method for laying and molding T-shaped composite material parts according to claim 5, characterized in that, The preset molding process is to heat and pressurize the material in an autoclave for curing.

8. The method for laying and molding T-shaped composite material parts according to claim 7, characterized in that, The surface of the second L-shaped component (103) that contacts the second molding mold (4) is the third contact surface (903). Before hot pressing and curing, flexible layup material is sequentially laid on the hard mold (901) so that the flexible layup material is cured on the surface of the hard mold (901) to form a flexible layer (902) that can fit with the third contact surface (903). Then, the second molding mold (4) is replaced with a hard mold (901) with a flexible layer (902) and then heated and pressurized in a hot autoclave for curing.

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