Forming method of fiber-reinforced composite pulling-extruding slender section

Abstract

The invention relates to a method for molding a fibre reinforced composite material drawing and extruding thin-wall section material. A guide mechanism is arranged in a mould port; the rear end of a first guide device is embedded into a square hole of a second guide device; an inner layer of a sternum of the section material adopts a paving layer of fibre fabric in any direction; two fabric layers of an outer layer contain 0 degree paving layers; the upper wing edge and the lower wing edge of the section adopt fibre fabric or unidirectional fibre; an inner layer of the sternum runs through a middle hole of the first guide device; two layers of the outer layer of the sternum run through an upper side hole and a lower side hole respectively; the upper wing edge and the lower wing edge of the section material run through two sides of the second guide device; and the section material is subjected to wire threading, gum dipping and heating and molding. The method overcomes the disadvantages that in the prior art the section material has low vertical and transverse shearing strength and can be only distributed along longitudinal unidirectional direction. The method substantially improves the strength of the fibre reinforced composite material drawing and extruding section material in non-principal direction; the section material is subjected to once curing and molding in a drawing and extruding production line and has excellent apparent performance and high-efficiency production speed; and the cost is not obviously improved.

Description

technical field [0001] The invention relates to a thin-wall profile forming method, in particular to a fiber-reinforced composite material pultrusion thin-wall profile forming method. Background technique [0002] The pultrusion process can achieve continuous and automated rapid mass production. However, the traditional pultrusion process can only make the fibers unidirectionally arranged along the assembly line, and the longitudinal and transverse shear strength of the profile is not high. When subjected to lateral bending load, the web is often sheared before the load reaches the critical load of bending failure, and the tensile and compressive strengths of the upper and lower flanges of the profile have a large margin. Fiber reinforced The advantages of high tensile and compressive strength of the material cannot be exerted, resulting in a great waste of mechanical properties. Theoretical and practical studies have shown that the use of multi-directional fiber arrangeme...

AI Technical Summary

Problems solved by technology

The method of sticking fiber cloth on the surface of the pultruded profile web by hand lay-up is low in production efficiency, and the mechanical properties of the product are relatively discrete, and the apparent performance is not good; the introduction of winding in the pultrusion process, that is, the use of pultrusion-winding molding process The method of production is more limited by the cross-section form and product use, such as I-shaped and other open cross-section profiles cannot be produced by this process

Moreover, both methods are costly

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