Large-curvature special-shaped surface large-height honeycomb co-curing sandwich structure composite material and forming method thereof

Abstract

The invention provides a large-curvature special-shaped surface large-height honeycomb co-curing sandwich structure composite material and a forming method thereof. The forming method comprises the following steps: shaping and curing a pre-impregnated and semi-cured aramid paper honeycomb on a male die to obtain a honeycomb core blank; placing the honeycomb core blank on a female die, filling polystyrene foam in the range of three to five honeycomb grids inwards according to the net size outline of a honeycomb core, pre-curing the polystyrene foam to obtain a rigidity pre-reinforced honeycomb core blank, and processing the honeycomb core blank to a theoretical size; and preparing a laminated layer of an outer skin, a reinforcing block and an inner skin prepreg from hot-melt prepreg, assembling the laminated layer with a honeycomb core and an embedded part, and curing to obtain the honeycomb co-curing sandwich structure composite material. The honeycomb core rigidity pre-reinforcement, laser projection assisted honeycomb forming and appearance processing technology and the sandwich structure assembly co-curing technology are adopted, collapse deformation of the honeycomb core in the curing forming process is avoided, and the formed composite material has the good internal quality, the good appearance size precision and the good embedded part position precision.

Description

technical field [0001] The invention belongs to the technical field of sandwich structure composite material forming, and in particular relates to a honeycomb co-cured sandwich structure composite material with a large curvature profiled surface and a large height and a forming method thereof. Background technique [0002] With the demand for larger size, greater load, higher speed, and structural-functional integration of new types of aerospace transport vehicles, it is difficult for sandwich structure composite materials with simple structure and low height to meet the needs of mouth covers, hatches, etc. Part design requirements. [0003] As the size and load of the aircraft increase, in order to ensure the overall mechanical properties of the part, the height of the honeycomb sandwich core is also designed to be higher. During the co-curing process of the A-type sandwich structure with chamfers on the peripheral edges of the honeycomb core, due to the lateral component ...

AI Technical Summary

Problems solved by technology

Therefore, the traditional co-curing molding process has been unable to avoid the problems of large-height honeycomb solidification deformation and collapse

[0004]As the speed of the aircraft increases, the aerodynamic shape of the aircraft is designed to be more complex, and the outer surfaces of parts such as hatches and flaps are often shaped surfaces; and the structure The design of functional integration often makes the inner surface of the parts more complex, and at the same time puts forward higher requirements for the position accuracy of the embedded parts inside the sandwich structure

[0005] In summary, the traditional honeycomb sandwich structure co-curing technology has been difficult to meet the design and use requirements of new aerospace vehicles, and the step-by-step curing method will It is difficult to guarantee the honeycomb-skin bonding quality of parts with complex surface sandwich structures, and it will also greatly increase the manufacturing cycle and cost

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