A non-destructive integrated hole-making method for woven composite hollow components

Abstract

The invention relates to a woven composite hollow component lossless integrated hole making method. The method comprises the following processing steps that a metal core capable of being extracted is designed according to geometrical characteristics of a structural component required to be prepared, and a core shaft die is manufactured; corresponding pre-buried holes and a shape control plug are designed according to the drilling position and the shape, and the metal shaft core is placed into the die; then, wax in the molten state or a high-molecular polymer is injected into the die, and the metal core is covered with the wax or the high-molecular polymer to become a composite core shaft; the core shaft is then clamped to an extracting mechanism of a weaving device, and the woven core shaft with the surface covered with an enhancing body is obtained; and finally, the woven core shaft is placed into the structural component inner surface die, resin is injected into the die, cooling and solidification are performed, heating is performed, the metal shaft core is extracted out after the internal wax or high-molecular polymer is completely eliminated, and the hollow woven fiber-enhanced structural component with holes is obtained. The woven composite hollow component lossless integrated hole making method has the multiple advantages that the manufacturing process is simple, hole making parameters are adjustable, one-time forming is achieved, and the strength is high, and the like.

Description

[0001] 【Technical field】 [0002] The invention relates to a hole-making method, in particular to a non-destructive and integrated hole-making method for a woven composite material hollow member, and belongs to the technical field of composite material processing methods. [0003] 【Background technique】 [0004] With the rapid development of high-performance electromechanical equipment, composite material pipe fittings with high specific strength and low inertia have been widely used. The overall performance can be designed, and the overall shape is easy to be manufactured simultaneously. It is widely used in aerospace, vehicles, etc. Components in other fields are often used to manufacture core load-bearing components. [0005] However, in the mechanical structure, it is usually necessary to punch holes in such pipes, and assemble the pipes into the target frame through mechanical connections. In the common mechanical processing method, the high-speed steel or cemented carbid...

AI Technical Summary

Problems solved by technology

In the common mechanical processing method, the high-speed steel or cemented carbide tool of the ordinary twist drill is usually used to drill the composite material unidirectional belt drilling. The hole making method needs at least four processes to complete, namely drilling-reaming-rough reaming- Fine reaming, this method not only has low production efficiency, but also has many problems: if the quality of the hole is not stable, splitting and shrinkage will occur in the hole, and the resulting scrap rate is as high as 30% or more

Due to the weak constraints of the entrance and exit positions during drilling, the drill tip is likely to generate a large axial force, which pushes away the outermost layers of material, resulting in delamination damage, and the fiber cannot be cut to cause the fiber to bend, causing tearing and Burrs and other damage

In addition, the excellent performance of composite materials is provided by continuous fibers. However, mechanical drilling needs to cut fibers, which can easily damage the integrity of fiber materials, resulting in a decrease in strength. Moreover, because the carbon fiber reinforced phase is extremely hard, it is easy to aggravate tool wear and cause edge cutting. The mouth is not sharp, it is difficult to cut the fiber, and it is easy to cause serious exit and entrance burrs

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