A 3D printing head and printing method for continuous fiber reinforced composites

Abstract

This invention relates to the field of additive manufacturing 3D printing technology, and discloses a 3D printing head and printing method for continuous fiber reinforced composite materials. The invention adds a concentric stepped temperature control module to the outside of the printing nozzle. This module applies a preset stepped temperature field with a gradient distribution from the inside out to the adjacent printed layer deposited filaments and the current deposited filament during the printing process. This controls the grain size and uniformity of the crystalline resin inside the adjacent and current deposited filaments, preventing large deformation of the printed product. Simultaneously, during the printing process, the adjacent printed layer deposited filaments are reheated and melted. Under the action of a preset pressure field, this promotes the fusion of the adjacent and current deposited filaments, improving the interlayer / inter-channel bonding strength, and thus enhancing the mechanical properties of the 3D printed continuous fiber additive manufacturing product.

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