Methods for composite filament fabrication in three dimensional printing

摘要

Various embodiments related to three dimensional printers, and reinforced filaments, and their methods of use are described. In one embodiment, a void free reinforced filament is fed into an conduit nozzle. The reinforced filament includes a core, which may be continuous or semi-continuous, and a matrix material surrounding the core. The reinforced filament is heated to a temperature greater than a melting temperature of the matrix material and less than a melting temperature of the core prior to drag the filament from the conduit nozzle.

主权项

1. A method for additively manufacturing a part in successive layers, the method comprising:
supplying a reinforced filament having a matrix material impregnating a plurality of reinforcing strands aligned along the reinforced filament; receiving the reinforced filament at a shearing region moved together with a nozzle; shearing the reinforced filament at the shearing region; guiding the reinforced filament to drag through the nozzle; heating the reinforced filament at the nozzle as the reinforced filament is displaced out of the nozzle; applying mechanical pressure by pressing with the nozzle to continuously compact the reinforced filament into a previously added layer of the part as the reinforced filament is fused into the part.