A composite material base barrel section forming die

Abstract

A composite material base barrel section molding die of the present invention comprises a combined core mold assembly mainly made of carbon fiber composite material for forming base barrel section components, the combined core mold assembly is a male mold structure, and end frames with airtightness requirements are arranged at both ends of the combined core mold assembly, and a rotating assembly for rotating during wire laying is arranged on the side of the end frame away from the combined core mold assembly, and a supporting structure for supporting the base barrel section components in the solidified state is arranged at the bottom of the end frame. The mold of the present invention is light in weight and has a small difference in thermal expansion, which is conducive to wire laying rotation, demoulding operation, solidification heat distribution and component solidification accuracy; the combined core mold assembly of the present invention is placed on the supporting structure and fixed by fixing parts, which greatly improves the stability of the device; casters are arranged at the bottom of the chassis to facilitate the transportation of the mold.

Description

Technical Field

[0001] The invention relates to the field of aviation manufacturing equipment, in particular to a composite material base barrel section forming die. Background Art

[0002] Composite barrel components have a closed structure and a circumferential molding surface. They have high requirements for thermal expansion, block structure, airtightness, etc. of the molding mold, especially the mold weight and demoulding operation. The current composite barrel component molding molds generally use metal molds or gypsum molds. Due to weight, demoulding, molding accuracy, service life and other issues, there are many design defects, and only small-sized or simple-structure composite barrel components can be molded. For large or complex composite barrel components, the current molding molds cannot meet their molding requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a composite material base barrel section forming die.

[0004] In order to solve the above technical problems, the present invention adopts the following technical scheme: a composite material base barrel section molding mold, comprising a combined core mold assembly mainly made of carbon fiber composite material for molding base barrel section components, the combined core mold assembly is a male mold structure, and end frames with airtightness requirements are arranged at both ends of the combined core mold assembly, and a rotating assembly for rotating during wire laying is arranged on the side of the end frame away from the combined core mold assembly, and a supporting structure for supporting the base barrel section components in the solidified state is arranged at the bottom of the end frame.

[0005] As a further improvement of the above technical solution:

[0006] The combined core mold assembly is a hollow cylindrical structure composed of a plurality of thin-walled plates, and the thin-walled plates are detachably connected to each other.

[0007] The thin-walled plate comprises a carbon fiber layer, and a reinforcing rib for reinforcing is arranged on the inner side of the carbon fiber layer, and the reinforcing rib is embedded in the inner side of the carbon fiber layer.

[0008] The reinforcing ribs are arranged in a crisscross pattern, and the cross-section of the reinforcing ribs is rectangular or Ω-shaped.

[0009] The inner wall of the thin-walled plate is filled with a temperature-resistant material layer for preventing the reinforcing ribs from being exposed and causing bag making risks.

[0010] The end frame is made of Invar steel material.

[0011] The rotating assembly comprises a connecting plate and a rotating shaft, and the rotating shaft is connected to the end frame through the connecting plate.

[0012] The supporting structure includes a positioning assembly, a supporting assembly, a base frame and casters. The supporting assembly is installed on the base frame, and the casters are installed at the bottom of the base frame. One end of the positioning assembly is detachably connected to the end frame, and the other end of the positioning assembly is clamped with the supporting assembly.

[0013] The positioning assembly comprises a connecting frame and a bearing member, one end of the connecting frame is detachably connected to the end frame, the other end of the connecting frame is connected to the bearing member, and the bearing member is clamped on the supporting assembly.

[0014] The support assembly comprises a support frame and a fixing member installed on the upper end of the support frame for fixing the bearing member.

[0015] Compared with the prior art, the advantages of the present invention are: the mold of the present invention is light in weight and has a small thermal expansion difference, which is beneficial to the wire laying rotation, demolding operation, curing heat distribution and guarantee of component curing accuracy; the combined core mold assembly of the present invention is placed on a supporting structure and fixed by fixing parts, which greatly improves the stability of the device; casters are provided at the bottom of the base frame to facilitate the transportation of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal structure of the thin-walled plate of the present invention;

[0018] Figure 3 It is a schematic diagram of the support structure of the present invention.

[0019] The numbers in the figure represent: 1. Combined core mold assembly; 11. Thin-walled plate; 111. Carbon fiber layer; 112. Reinforcement ribs; 113. Heat-resistant material layer; 2. End frame; 3. Rotation assembly; 31. Connecting plate; 32. Rotation axis; 4. Support structure; 41. Positioning assembly; 411. Connecting frame; 412. Bearing member; 42. Support assembly; 421. Support frame; 422. Fixing member; 43. Base frame; 44. Casters. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 3As shown, a composite base barrel section forming mold of this embodiment includes a combined core mold assembly 1 mainly made of carbon fiber composite material for forming base barrel section components. The combined core mold assembly 1 is a male mold structure. End frames 2 with airtightness requirements are arranged at both ends of the combined core mold assembly 1. A rotating assembly 3 for rotating during wire laying is arranged on the side of the end frame 2 away from the combined core mold assembly 1. A supporting structure 4 for supporting the base barrel section component in the solidified state is arranged at the bottom of the end frame 2. The combined core mold assembly 1 is made of carbon fiber composite material, is light in weight, and has a small difference in thermal expansion with the composite base barrel section component, which is more conducive to ensuring the molding accuracy and demoulding operation. When preparing the component, the combined core mold assembly 1 is placed on the rotating mechanism, and the mold release agent is evenly applied on the outer surface of the combined core mold assembly 1. The rotating assembly 3 is driven to rotate by an external motor, and the wire laying machine is used to lay the wire or the wire is manually assisted to form a composite cylindrical fuselage semi-finished product. Then the combined core mold assembly 1 is moved to the support structure 4, and the support structure 4 positions and supports the combined core mold assembly 1. The whole is negatively compacted by a vacuum bag. The vacuum bag includes an inner vacuum bag arranged on the inner surface of the combined core mold assembly 1 and an outer vacuum bag arranged on the outside of the composite material. The inner and outer vacuum bags are compacted by the end frame 2 to achieve the air tightness of the mold, and then the autoclave is used for curing and molding. After curing and molding, demolding can be performed.

[0022] In this embodiment, the combined core mold assembly 1 is a hollow cylindrical structure composed of several thin-walled plates 11, and the thin-walled plates 11 are detachably connected. The thin-walled plates 11 are connected by bolts and pins to form a hollow cylindrical structure, and the outer surface forms the molding surface of the composite material barrel segment component. After the barrel segment component is formed, the combined core mold assembly 1 is split into multiple thin-walled plates 11 according to the set steps for demoulding without damaging the mold or the barrel segment component.

[0023] In this embodiment, the thin-walled plate 11 includes a carbon fiber layer 111, and a reinforcing rib 112 for reinforcing is provided on the inner side of the carbon fiber layer 111, and the reinforcing rib 112 is embedded in the inner side of the carbon fiber layer 111. The reinforcing rib 112 enhances the tensile performance of the carbon fiber layer 111, so that the single thin-walled plate 11 has sufficient rigidity.

[0024] In this embodiment, the reinforcing ribs 112 are arranged in a crisscross pattern, and the cross-section of the reinforcing ribs 112 is rectangular or Ω-shaped.

[0025] In this embodiment, the inner wall of the thin-walled plate 11 is filled with a temperature-resistant material layer 113 for preventing the reinforcing ribs 112 from being exposed and causing bag-making risks.

[0026] In this embodiment, the end frame 2 is made of invar steel material. The end frame 2 has a small thermal expansion coefficient and a small thermal expansion difference with the combined core mold assembly 1, which is conducive to maintaining the stable precision of the molding surface of the combined core mold assembly 1 during the curing process.

[0027] In this embodiment, the rotating assembly 3 includes a connecting plate 31 and a rotating shaft 32, and the rotating shaft 32 is connected to the end frame 2 through the connecting plate 31. The connecting plate 31 and the end frame 2 are fixedly connected by multiple bolts and pins, and the rotating assembly 3 is used to connect and fix the mold to the automatic wire laying equipment.

[0028] In this embodiment, the support structure 4 includes a positioning assembly 41, a support assembly 42, a base frame 43 and casters 44. The support assembly 42 is mounted on the base frame 43, and the casters 44 are mounted at the bottom of the base frame 43. One end of the positioning assembly 41 is detachably connected to the end frame 2, and the other end of the positioning assembly 41 is clamped with the support assembly 42. The base frame 43 is composed of ordinary steel plates and rectangular tubes and is a support platform of the support structure 4. One end of the positioning assembly 41 is fixedly connected to the end frame 2 by multiple bolts, and the support assembly 42 is fixedly connected to the base frame 43 by multiple bolts and pins. The casters 44 facilitate the transportation of the mold.

[0029] In this embodiment, the positioning assembly 41 includes a connecting frame 411 and a bearing member 412 . One end of the connecting frame 411 is detachably connected to the end frame 2 , and the other end of the connecting frame 411 is connected to the bearing member 412 . The bearing member 412 is clamped on the supporting assembly 42 .

[0030] In this embodiment, the support assembly 42 includes a support frame 421 and a fixing member 422 installed on the upper end of the support frame 421 for fixing the carrier 412. The fixing member 422 is a buckle, one end of the fixing member 422 (snap-lock) is hinged on the support frame 421, and the other end of the fixing member 422 (snap-lock) is connected to the support frame 421 by bolts. A groove for placing the carrier 412 is opened on the support frame 421, and the carrier 412 is placed in the groove. The fixing member 422 (snap-lock) is fixed to the support frame 421 by bolts to fix the carrier 412. At least one fixing member 422 (snap-lock) is respectively arranged on the support frames 421 on both sides of the combined core mold assembly 1, and the fixing members 422 (snap-locks) on both sides are arranged crosswise.

[0031] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A composite material base barrel section forming die, characterized in that: The invention comprises a combined core mold assembly (1) mainly made of carbon fiber composite material and used for forming a base barrel segment component. The combined core mold assembly (1) is a male mold structure. End frames (2) with airtightness requirements are arranged at both ends of the combined core mold assembly (1). A rotating assembly (3) for rotating during wire laying is arranged on a side of the end frame (2) away from the combined core mold assembly (1). A supporting structure (4) for supporting the base barrel segment component in a solidified state is arranged at the bottom of the end frame (2). The supporting structure (4) positions and supports the combined core mold assembly (1), and the whole is negatively compacted by a vacuum bag. The vacuum bag comprises an inner vacuum bag arranged on the inner surface of the combined core mold assembly (1) and an outer vacuum bag arranged on the outer side of the composite material. The combined core mold assembly (1) is a hollow cylindrical structure composed of a plurality of thin-walled plates (11), wherein the thin-walled plates (11) are detachably connected to each other; the thin-walled plates (11) include a carbon fiber layer (111), and a reinforcing rib (112) for reinforcing is arranged on the inner side of the carbon fiber layer (111); the reinforcing rib (112) is embedded in the inner side of the carbon fiber layer (111); and the inner wall of the thin-walled plate (11) is filled with a temperature-resistant material layer (113) for preventing the reinforcing rib (112) from being exposed and causing bag making risks.

2. The composite material base barrel section forming die according to claim 1, characterized in that: The reinforcing ribs (112) are arranged in a crisscross pattern, and the cross-section of the reinforcing ribs (112) is rectangular or Ω-shaped.

3. The composite material-based barrel section forming die according to any one of claims 1-2, characterized in that: The end frame (2) is made of Invar steel material.

4. The composite material base barrel section forming die according to claim 3, characterized in that: The rotating assembly (3) comprises a connecting plate (31) and a rotating shaft (32); the rotating shaft (32) is connected to the end frame (2) via the connecting plate (31).

5. The composite material base barrel section forming die according to claim 4, characterized in that: The support structure (4) comprises a positioning assembly (41), a support assembly (42), a base frame (43) and casters (44); the support assembly (42) is mounted on the base frame (43); the casters (44) are mounted at the bottom of the base frame (43); one end of the positioning assembly (41) is detachably connected to the end frame (2); and the other end of the positioning assembly (41) is snap-connected to the support assembly (42).

6. The composite material base barrel section forming die according to claim 5, characterized in that: The positioning assembly (41) comprises a connecting frame (411) and a bearing member (412), one end of the connecting frame (411) is detachably connected to the end frame (2), the other end of the connecting frame (411) is connected to the bearing member (412), and the bearing member (412) is clamped on the supporting assembly (42).

7. The composite material base barrel section forming die according to claim 6, characterized in that: The support assembly (42) comprises a support frame (421) and a fixing member (422) mounted on the upper end of the support frame (421) and used for fixing the bearing member (412).

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