A method of filament winding a composite shell based on a lightweight soluble mandrel

Abstract

The present application relates to the field of composite shell manufacturing, in particular to a kind of composite shell winding forming method based on light soluble core mold.The steps of the present application are: designing winding track and core mold structure, assembling core mold frame, installing profile plate, forming winding core mold.Core mold is wound on machine, after winding is completed, core mold is heated and pressurized to solidify, soluble connecting piece is dissolved in solution, and frame structure piece is removed.Finally, the composite shell is taken out from solution and dried, and the manufacturing of composite shell is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite shell manufacturing, in particular to a composite shell winding forming method based on a light-weight soluble core mold. BACKGROUND

[0002] Since the composite material has the characteristics of high specific strength, large specific modulus, strong designability and rich functions, it has been widely used since the 1960s. With the development of large equipment and the increasing demand for lightweight, the demand for large composite material components is increasing. The manufacturing technology of composite shell as a key part of bearing internal pressure load, axial load and other complex loads has attracted widespread attention.

[0003] In the manufacturing of large composite material shell, due to the large weight of the core mold, the local deflection deformation is large, the forming quality is unstable, and it is difficult to demold, disassemble, and has long manufacturing cycle and many supporting equipment, which directly affects the manufacturing quality and manufacturing cost. Therefore, there is a lack of a composite shell forming method based on a light-weight soluble core mold suitable for large composite material shell component manufacturing. SUMMARY

[0004] The present application mainly provides a composite shell winding forming method based on a light-weight soluble core mold, which mainly solves the deformation problem caused by the large weight of the core mold of the large composite material shell and the long manufacturing cycle and high manufacturing cost problem caused by the demolding difficulty.

[0005] (1) According to the structure and performance requirements of the shell, the winding trajectory and its light-weight soluble core mold structure are designed;

[0006] (2) Assemble the head support structure and the body support structure on the mandrel to form a core mold frame structure, and use soluble connecting pieces in the connecting pieces in the structure;

[0007] (3) Install the profile plate on the core mold frame structure to form a winding core mold;

[0008] (4) Wind the pre-impregnated fiber material on the core mold according to the corresponding trajectory;

[0009] (5) Heat and press the wound shell and core mold together to make the pre-impregnated material solidify and form a composite material shell;

[0010] (6) Put the composite material shell and the core mold into the solution together, remove the soluble connecting pieces in the core mold, and take out the core mold related structure and the profile plate;

[0011] (7) Take out the composite material shell and dry it to realize the forming and manufacturing of the composite material shell component.

[0012] To achieve the above object, according to one aspect of the present application, a composite shell winding forming method based on a light-weight soluble core mold is provided, and the specific steps are as follows:

[0013] Further, the head support structure and the body support structure are composed of beams, columns and ribs made of light-weight composite materials.

[0014] Further, the soluble connecting piece can be a metal piece or a non-metal piece.

[0015] Further, the profile panel is a composite material sheet, a metal sandwich panel or a resin sheet.

[0016] Further, the solution is a liquid matched with the soluble connecting piece, including hot water, potassium chloride solution and organic solvent.

[0017] Further, the liquid material is heated and subjected to ultrasonic cavitation treatment to accelerate the dissolution of the connecting piece.

[0018] The present application has the following beneficial effects:

[0019] 1) By using the frame structure and light-weight structural members and profile members, the weight of the core mold is effectively reduced, and the deformation is reduced

[0020] 2) By using the soluble connecting piece, the mold disassembly speed is accelerated, the manufacturing cycle of the large composite shell can be shortened, and the manufacturing cost is reduced BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Flowchart of the composite shell forming method based on the light-weight soluble core mold of the present application

[0022] Figure 2 Schematic diagram of the light-weight soluble core mold structure of the present application

[0023] Figure 3 Schematic diagram of the local structure of the light-weight soluble core mold of the present application DETAILED DESCRIPTION

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings.

[0025] According to the typical embodiment of the present application, as shown in Figure 2 According to the shell geometry and performance parameters, T700 carbon fiber prepreg is selected to be wound according to the geodesic trajectory, and the core mold structure is designed as shown in Figure 2 According to the deflection deformation and the minimum hole size, the support structure member is designed, and the material is selected to be carbon fiber composite material. The profile panel uses carbon fiber composite material, and the connecting piece uses soluble magnesium alloy.

[0026] In the manufacturing process, the head support (22), the body circumferential rib (23), the body circumferential beam (24), and the body radial column (25) are assembled on the mandrel (21) to form a core mold frame. Then the profiled plate (26) is arranged on the core mold frame. The fiber geodesic trajectory winding is performed on the winding equipment, and after winding to the designed thickness, the core mold is placed in a hot press tank together with the shell, and kept at 150 degrees Celsius and 0.7 MPa for 6 hours to make the prepreg cured. After curing and cooling, the core mold and the shell are taken out and placed in 60 degrees Celsius hot water to dissolve the soluble magnesium alloy connecting piece (31) (32) to separate the support structure pieces. After completion, the core mold frame structure piece is taken out, the shell is dried, and the manufacturing of the composite shell is completed.

Claims

1. A method for winding composite material shells based on a lightweight soluble mandrel, characterized in that, Includes the following steps: (1) Design the winding trajectory and its lightweight soluble core mold structure according to the shell structure and performance requirements; (2) Assemble the head support structure and body support structure on the mandrel to form the mandrel frame structure. The connecting parts in the structure are soluble connecting parts. (3) Install the molding panel on the core mold frame structure to form a winding core mold; (4) Wrap the pre-impregnated fiber material around the mandrel according to the corresponding trajectory; (5) Heat and pressurize the wound shell and the core mold together to solidify the prepreg into a composite material shell; (6) Place the composite material shell and the core mold together into the solution, remove the soluble connectors in the core mold, and take out the relevant structural parts and mold panel of the core mold; (7) Remove the composite material shell and dry it to realize the forming and manufacturing of the composite material shell component.

2. The composite material shell winding forming method based on a lightweight soluble mandrel according to claim 1, characterized in that, The head support structure and body support structure are composed of beams, columns and reinforcements made of lightweight composite materials.

3. The composite material shell winding forming method based on a lightweight soluble mandrel according to claim 1, characterized in that, The soluble connector can be a metal or a non-metallic component.

4. The composite material shell winding forming method based on a lightweight soluble mandrel according to claim 1, characterized in that, The panel is a composite material sheet, a metal sandwich panel, or a resin sheet.

5. The composite material shell winding forming method based on a lightweight soluble mandrel according to claim 1, characterized in that, The solution is a liquid compatible with soluble connectors, including hot water, potassium chloride solution, and organic solvents.

6. The liquid material according to claim 5 is characterized in that, The liquid is heated and subjected to ultrasonic cavitation treatment to accelerate the dissolution of the connector.

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