Thermal medium variable energy rate surface force loading forming method for fiber metal laminate

Abstract

The invention provides a fiber metal laminate thermal medium variable energy rate surface force loading forming method, and belongs to the field of composite material forming. The novel method is a novel technology integrating high-energy-rate impact forming and liquid-filling static pressure forming in a crossed mode, and has the advantages of the two. The problems that in traditional forming, fiber materials are stacked and distributed unevenly, and in the material curing process, interlayer residual stress is large, and resilience is large are solved. The part rigidity can be enhanced, the die number is reduced, the equipment tonnage is reduced, and the forming efficiency is improved. The forming process mainly comprises the steps that a mold is cleaned, the surface of a metal layer is treated, a blank layer is placed on the forming mold, the mold is closed downwards, liquid is loaded, heating is conducted till thermoplastic resin enters a viscous state and high-elastic state mixed state, and at the moment, high-energy-rate fluid impact forming is conducted on the composite blank. And after forming, solidification is carried out under the synergistic effect of fluid high-pressure variable-path loads and gradient cooling, and interlayer tight combination of laminates is achieved. The method is mainly used for accurate forming of large complex thin-wall components in the aerospace manufacturing field.

Description

technical field [0001] The invention belongs to the field of plate composite material forming, in particular to the preparation and forming of complex cross-section thin-walled components of fiber metal super-hybrid composite materials. Background technique [0002] With the development of aerospace, high-performance engines and military equipment, especially in recent years, the Shenzhou series of manned aircraft, strategic missiles, launch vehicles, aerospace planes, supersonic transport aircraft, supersonic cruise UAVs and large push ratios With the development of aero-engines, the demand for lightweight high-temperature-resistant and high-strength composite materials is becoming more and more urgent. Fiber metal laminates (Fiber Metal Laminates, FMLs) are a kind of hyperhybrid composite material obtained by laying metal sheets and fiber-reinforced resin prepregs alternately after necessary interface treatment, and after a certain curing process. The unique composition o...

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Problems solved by technology

[0003] The forming method of FMLs is similar to that of metal materials, but due to the large performance difference between the layers of FMLs and the small fiber fracture strain, the forming limit of FMLs is much smaller than that of corresponding metal materials, and the forming process is accompanied by volume shape changes such as metal plastic deformation and fibers. , Resin multi-fluid deformation and solidification and other problems, the forming mechanism is complex, and the defects such as delamination and fracture are various, which bring great difficulties to the forming and manufacturing

Conventional plastic forming methods are prone to defects such as fiber material accumulation, uneven distribution, and delamination, and it is difficult to form FMLs components with complex shapes

The lightweight hydroforming method can effectively reduce delamination defects due to the high-pressure uniform load of the fluid medium, but to eliminate delamination, especially at small features such as rounded corners, it is necessary to load a large liquid chamber pressure. This will lead to a significant increase in the tonnage and cost of the required equipment

Especially when the material deformation required in the complex component forming process is large and the forming limit is high, there is a lack of new forming methods that can satisfy both the deformation law of the laminate and the flow state of the thermoplastic resin.

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