Multi-material gradient forming fusion extrusion system for 3D printing

Abstract

The invention belongs to the field of material machining, and discloses a multi-material gradient forming fusion extrusion system for 3D printing. The multi-material gradient forming fusion extrusionsystem for 3D printing comprises two parts of a particle differential transmission mechanism and a particle fusion extrusion mechanism. According to the multi-material gradient forming fusion extrusion system for 3D printing, the gradient forming of heterogeneous multi-materials is realized by controlling the feeding amount of different kinds of particles in the forming process; and by adopting the system, the wire material machining can be changed into particle processing, and the 3D printing of composite polymer materials can be supported by mixing two kinds of polymer particles together. The composition control of two kinds of polymer mixed particles is realized, and the composition proportion of printing materials is enabled to be controllable so as to realize 3D printing of the functionally gradient heterogeneous multi-materials; and the range of usable materials is expanded by flexible machining,the production cost is reduced, and the occurrence of the problems of wire breaking,blockage of a spray headand the like in wire machining is avoided.

Description

technical field [0001] The invention belongs to the field of material processing, and relates to a multi-material gradient forming melt extrusion system for 3D printing. Background technique [0002] Fused Deposition Modeling (FDM) is a kind of 3D printing technology, which was successfully developed by American scholar Scott Crump in 1988. The materials used in this technology are generally thermoplastic materials, such as polylactic acid PLA, ABS, wax, etc., and are supplied in the form of filaments with a fixed diameter, and the materials are heated and melted in the nozzle. The nozzle moves along the section profile of the part and the filling track, and at the same time extrudes the molten material. The material solidifies rapidly and condenses with the surrounding materials, and the formed part is obtained by layer-by-layer accumulation. However, once the silk material is drawn into silk, its composition and content are fixed, and it cannot be customized according to ...

AI Technical Summary

Problems solved by technology

At present, the mainstream pellet feed processing feed system is mainly for single material extrusion processing, such as invention patents CN108466423A, CN108327252A, etc., which melt and extrude the pellets in the form of a screw, which can realize the layer-by-layer accumulation of pellets. However, in the process of processing, it is impossible to achieve real-time adjustment and control of the composition ratio of heterogeneous multi-materials, that is, it is impossible to realize composition gradient forming; the invention patent CN107263858B realizes the manufacture of heterogeneous materials in the form of traditional wire FDM, which uses rotary multi-nozzle switching The printing device performs multi-material and multi-process high-efficiency 3D printing by rotating and switching multiple wire feeding and printing mechanisms. However, the possibility of gradient processing and forming is not mentioned, and the traditional wire form cannot overcome the broken wires of FDM itself. The problem of nozzle blockage; utility model patent CN208035395U discloses a high-viscosity gradient material 3D printer feeding system, which mainly pumps high-viscosity materials into the screw valve processing chamber through an air pump, PU tube, etc., and can adjust the printing nozzle to output high-viscosity printing in real time The type of material, but for granular materials, which cannot be pumped by air pumps, etc.

[0005] Therefore, for inorganic nonmetals and their composite materials, the research on heterogeneous multi-material gradient forming is less, and it is in a blank state. It is urgent to develop a multi-material gradient forming melt extrusion system for 3D printing to solve the above problems.

Images