Punching needle, threading needle, system and method for making foam sandwich preform

Abstract

The invention belongs to the technical field of preparation technology of a foam core preform for composite material structural parts, and more particularly relates to a punching needle, a threading needle, a system and a method for making a foam core preform. The present invention provides a punching needle for making a foam sandwich preform, which is a solid columnar structure, and includes an upper clamping part and a lower punching part, and the clamping part has a polygonal cross-section. A columnar structure is used to facilitate clamping; the punched part is a cone structure with a diameter gradually decreasing from top to bottom, and its cross section is a polygonal star or gear shape. The present invention utilizes the punching needle, and completes punching and stitching in two steps, which can effectively avoid fluffing and yarn breakage caused by friction between fibers and solid foam during the stitching process, thereby achieving the purpose of improving production efficiency. In addition, the problem of excessively high resin content in the through-hole portion can be avoided when the resin is introduced in a vacuum.

Description

technical field [0001] The invention belongs to the technical field of preparation technology of foam sandwich preforms for composite material structural parts, more specifically, relates to a punching needle, yarn threading needle, system and method for making foam sandwich preforms, more specifically The invention relates to a perforating needle, a perforating device and a suturing method for making a foam sandwich preform with high compression resistance and shear resistance. Background technique [0002] The traditional sandwich structure is a light-weight and high-strength structure made of upper and lower layers of thin and rigid panels and a middle layer of light and thick core material. The thicker core material is bonded in the middle to keep the upper and lower panels away from the neutral plane. The section moment of inertia of the structure is greatly increased, and the bending resistance of the panel is fully exerted. The sandwich structure can greatly improve ...

AI Technical Summary

Problems solved by technology

[0006] In view of the defects of the prior art, the object of the present invention is to provide a perforating needle, threading needle, system and method for making a foam sandwich preform, by redesigning the structure of the perforating needle and threading needle, And adjust the punching system and punching method, and complete the punching and sewing in two steps to solve the problem of fiber fluffing, yarn breakage, low production efficiency and round holes in the punching and puncturing process of the existing foam sandwich preform. Problems such as excessive resin content in parts

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