A 3D printer of continuous fiber reinforced composite material and its printing method

Abstract

The invention discloses a 3D printer of a continuous fiber reinforced composite material and a printing method thereof, comprising a heating block, a heating element is arranged in the heating block; a first channel, a second branch channel, and a third branch channel are opened in the heating block, The first channel, the second branch channel, and the third branch channel are arranged in a Y shape, the first channel is provided with a nozzle, the second branch channel, and the third branch channel are respectively connected with throat pipes, and each throat pipe is connected with a cooling pipe, The push-in connector has a channel in the heating block, the channel is located between the second branch channel and the third branch channel, the channel communicates with the first channel, and also includes a feeding device for feeding the wire into the quick-plug connector. The orientation of the continuous fiber in the composite material is controllable through the conduit, the channel, and the first channel, and the comprehensive performance of the 3D printed part is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of printers, relates to a 3D printer of continuous fiber reinforced composite materials, and also relates to a printing method of the 3D printer. Background technique [0002] 3D printers are based on extruding raw materials, using 3D design software to print a 3D model of the drawn product. 3D printing technology is a kind of additive manufacturing technology, which has the advantages of low manufacturing cost and short production cycle. At present, the products of 3D printers have poor mechanical properties such as strength and stiffness, and cannot be used in the engineering field very well. Fillers need to be used to reinforce the modified composite materials. Invention patent (patent number 2015107817291, named as a reinforced PLA material for 3D printing) discloses that 3D printing materials use chopped carbon fiber to reinforce PLA, and invention patent (patent number 2018109685159, named lignin / micr...

AI Technical Summary

Problems solved by technology

At present, the products of 3D printers have poor mechanical properties such as strength and stiffness, and cannot be used in the engineering field very well. It is necessary to use fillers to enhance the modified composite materials.

Invention patent (patent number 2015107817291, named as a reinforced PLA material for 3D printing) discloses that 3D printing materials use chopped carbon fiber to reinforce PLA, and invention patent (patent number 2018109685159, named lignin / microcrystalline cellulose Composite, reinforced polylactic acid 3D printing material and its preparation method), all short fibers or powders are chemically pretreated first, and then the reinforced polylactic acid 3D printing material is prepared by melt extrusion blending and wire drawing molding, these The orientation distribution of the filler has a large randomness, and the filler is prone to agglomeration and uneven dispersion during the blending process, resulting in defects in its microstructure and resulting in mechanical properties that are far from the expected performance indicators.

But this production method has the following disadvantages: (1) The steps are cumbersome, and the silk material needs to be pre-soaked in the photocurable resin before production, and crosslinking reaction occurs under ultraviolet light irradiation, the production efficiency is low, and the process is complicated; The cost of cured resin is high, the bonding strength with the plastic matrix interface is low, and it is easy to peel off (3) Light-cured resins often have certain corrosiveness and toxicity, and there is dissolution of mercury, silver, copper, and zinc, and organic volatilization occurs during the crosslinking reaction. points, not enough energy saving and environmental protection

But this kind of printer head structure has the following disadvantages: (1) The fiber filaments are located at the outer end of the feeding pipe, only half of the fibers can be wrapped by the resin, and it is impossible to ensure that the fiber filaments are completely infiltrated by the molten resin, resulting in the bonding strength of the fiber-resin matrix interface. Low, easy to peel off; (2) Fibers that are not infiltrated by resin cannot be bonded to the cooled upper layer of resin material, resulting in low interlayer bonding strength of printed parts and poor mechanical properties of parts; (3) The printing nozzle must control the movement of the wire feeding tube at any time to ensure that the fiber is under the molten resin, otherwise it cannot play the role of covering the fiber, but the angle control of the wire feeding tube is very difficult, and it is impossible to control the wire feeding tube flexibly and accurately The rotation angle will inevitably limit the shape of the printed part, so it is impossible to print a 3D model with complex shapes

Images