Post-curing method for low-cost fiber-reinforced thermosetting composite material 3D printing component

Abstract

A low-cost post-curing method for a fiber reinforced thermoset composite material 3D printing component comprises the steps that 3D printing of the fiber reinforced thermoset composite material component is conducted on a printing platform with dense small holes; repeatedly dipping the surface of the component to form a multi-layer solid silicone rubber film, completely wrapping the component and forming a flexible interface on the surface of the component, and uniformly pricking holes in the solid silicone rubber film by using a needle; then the printing platform and the component are integrally taken down, a solid silicone rubber film coated component which is wrapped and shaped by a vacuum bag and embedded with a powder material is manufactured, finally, the vacuum bag is continuously vacuumized to keep extrusion shaping, and a curing reaction is completed through segmented gradient heating of heating equipment. And removing the powder and the solid silicone rubber film to obtain a cured fiber reinforced composite material finished product. While sufficient flowing of resin and sufficient infiltration of fibers are guaranteed, the porosity of the component is reduced, and the original forming shape of the component is kept unchanged; the method has the advantages of low cost, recyclability and environmental protection.

Description

technical field [0001] The invention relates to the technical field of post-curing of fiber-reinforced thermosetting composite materials, in particular to a low-cost post-curing method for 3D printing components of fiber-reinforced thermosetting composite materials. Background technique [0002] Fiber-reinforced thermosetting composites are widely used in the fields of automobiles, construction, sports and aerospace due to their excellent mechanical properties, high specific strength and specific modulus, and designability. Curing reaction is a key process in the manufacture of fiber-reinforced thermosetting composites. After the composite material is manufactured, it is necessary to initiate the curing reaction under high temperature, high pressure, ultraviolet light or other induced conditions to cross-link the polymer and obtain excellent mechanical properties. Under severe curing reaction conditions, how to ensure the smooth progress of the curing reaction while maintai...

AI Technical Summary

Problems solved by technology

However, this curing method has high costs, low production efficiency, high energy consumption, and pollutes the environment. It also has the disadvantages that the size of the components is restricted by the size of the autoclave, and the complexity of the shape of the components is limited by the mold. It is not suitable for large-scale and complex structures. Difficult to meet the curing needs of 3D printing composite components

Therefore, some researchers have proposed a post-curing method using powder embedding and silicone rubber wrapping. The former has the disadvantages that it is difficult to remove the powder and precipitated resin after solidification, and cannot be demolded; Pressure, resulting in high porosity of components after curing, poor mechanical properties, and high cost of silicone rubber, it is difficult to remove fine and complex thin-walled components, and strong removal will lead to component damage

[0004]The problem of curing method greatly restricts the application of thermosetting fiber reinforced 3D printing technology

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