A self-centering continuous fiber composite 3D printing extrusion head

Abstract

The invention belongs to the technical field of 3D printing, and discloses a self-centering continuous fiber composite 3D printing extrusion head. The self-centering continuous fiber composite 3D printing extrusion head comprises an extrusion head body, a guide channel, a softening channel and a fusing channel are sequentially arranged in the extrusion head body, the extrusion head further comprises a conveying mechanism for conveying a base body material to the guide channel, the minimum diameter of the softening channel is matched with the diameter of the base body material, and the fusing channel is a channel used for allowing fluid to spirally advance around the axis of the fusing channel. The extrusion head enables fiber wires to enter the center of the base body material.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a self-centering continuous fiber composite material 3D printing extrusion head. Background technique [0002] Continuous fiber composites have excellent properties such as high modulus, high strength, high toughness, good thermal stability, and strong designability, and have important application prospects in aerospace, national defense and military industries, and civil industries. Traditional continuous fiber composite molding processes include thermocompression molding, RTM molding, winding molding, pultrusion molding, lamination molding, etc., which have played a very important role in promoting the development and application of continuous fiber composite materials, but there have always been some The disadvantages cannot be overcome. For example, most molding processes require special molds. The molding process is complicated and the processing cost is high. It is diff...

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Problems solved by technology

[0005] 1. The wettability of fiber filaments and thermoplastic matrix materials in the extrusion molding process is not enough, resulting in insufficient fusion of matrix materials and fiber filaments after curing, so that the mechanical properties of the final formed components still cannot reach the level of traditional technology

[0006] 2. It is impossible to ensure that the fiber filaments are always in the center of the molten substrate fluid during the composite material extrusion molding process, which affects the precise controllability of the fiber filament routing path, and at the same time makes the interlayer strength poor after stacking molding, and the performance of the components cannot fully meet the actual use. need

[0007] 3. In the existing 3D printing process of continuous fiber composite materials, the shearing of continuous fibers is mostly realized by external shearing devices. By controlling the movement of the shearing device, the jump during printing and the shearing of continuous fibers when printing is completed are realized. , not only has a huge motion structure, but also needs to cooperate with complex motion control algorithms, which greatly limits the molding speed of continuous fiber composite 3D printing

This method enhances the compactness and wettability of the fiber filaments, but the overall structure is too complex and difficult to realize, and it is impossible to make the fibers enter the center of the matrix material, and it is impossible to realize the automatic adjustment of the fiber filaments during printing or after printing. to cut

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