3D printing method for continuous fibre-reinforced thermoplastic resin matrix composite material, and printing head

Abstract

The invention discloses a 3D printing method for a continuous fibre-reinforced thermoplastic resin matrix composite material, and a printing head. According to the method, fibre bundles and molten thermoplastic resins can be subjected to rotary blending and then subjected to rotary extrusion, and extruded wires are spiral; and the printing head is capable of charging the fibre bundles and the thermoplastic resins in a melting cavity, and spiral tooth rings are arranged at the inner sides of the melting cavity and an extrusion head, and rotate in opposite directions. The heated-molten resins and fibres are stirred by the spiral tooth rings which bidirectionally rotate after being blended, so that the fibres are compactly wound into a spiral column shape from a flat shape, the resins are uniformly distributed in each fibre orientation, and then a blend is extruded to a forming area from an extrusion port and cooled and cured to form a spatial entity. According to the method and the printing head, which are disclosed by the invention, the flat large-tow fibres can be used as reinforcements in a 3D printing process, the compactly-wound fibres have a high compaction degree, the fibres and the matrixes are adequately soaked, and the formed fibres and resins are uniformly distributed; and therefore, the method and the printing head are capable of greatly improving the mechanical property of a member, and improving the forming quality.

Description

technical field [0001] The invention relates to a molding technology of composite materials, in particular to a molding technology of thermoplastic resin composite materials reinforced by connecting fibers, in particular to a 3D printing method and printing head of continuous fiber reinforced thermoplastic resin-based composite materials. Background technique [0002] Rapid prototyping is a new type of manufacturing process that comprehensively applies computer-aided design, polymer material science, digital control and other cutting-edge technology fields. spatial geometric entities. This technology is different from the traditional subtractive manufacturing process (remove the excess material of the blank to obtain the target entity), and it has been improved into an additive manufacturing process, which makes the molding mold no longer needed in the manufacturing process, shortens the part design cycle, and can manufacture any A three-dimensional entity with a complex st...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to aim at the small size of connecting fibers used in the 3D printing of existing thermoplastic resin-based composite materials, and the impregnation of the connecting fibers cannot be effectively impregnated, resulting in low molding speed, large component size restrictions, and molded parts. In order to solve the problem of low comprehensive performance, a fiber tow with a large size is invented, which has fast forming speed and improved surface quality. At the same time, the interface between the fiber and the thermoplastic matrix is ​​well bonded, the component fiber content is high, and the fiber density is high. Printing A 3D printing method of continuous fiber reinforced thermoplastic resin matrix composites with improved mechanical properties of components, and a corresponding printing head is provided at the same time

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