A three-dimensional printing method of nano-metal powder based on induction heating

Abstract

The invention provides a three-dimensional printing and forming method of nano-metal powder based on induction heating, which includes: preparing CAD data files of three-dimensional printing forming parts, forming substrates, metal nano-powder and nano-powder spraying array plate; Graphics are filled in internal blocks; in the vacuum forming chamber, the forming substrate and the formed part are kept at the set temperature by heating; the slice data of the current slice is obtained, and the corresponding powder feeding is controlled and opened according to the corresponding divided small block Nozzle injection valve, accompanied by the melting of metal nanopowder and the leveling process of metal liquid, will have a solidification effect at the same time, and the corresponding small block will increase a certain thickness. The present invention cleverly utilizes the process idea of ​​making the temperature of the forming substrate and the formed part below the melting point of the block and above the melting point of the metal nano powder, without the need for high-energy beam-assisted melting effect, and realizes ultra-fine and ultra-high-speed three-dimensional parts based on nano-metal powder 3D molding.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an induction heating-based three-dimensional printing molding method of nanometer metal powder. Background technique [0002] 3D printing (additive manufacturing) technology is actually a general term for a series of rapid prototyping technologies for parts. The coordinates discontinuously make the displacement of the thickness of the layer, and finally form a three-dimensional workpiece. The current rapid prototyping technologies on the market are divided into 3DP technology, FDM fusion lamination molding technology, SLA stereolithography technology, SLS selective laser sintering technology, DLP laser forming technology and UV ultraviolet forming technology. [0003] Due to the high melting point of metals, 3D printing technology for metal materials requires high-energy-density laser beams or electron beams as heat sources. With the development of sc...

AI Technical Summary

Problems solved by technology

[0008] In the prior art, although all kinds of metal 3D printing technologies basically use metal powder as the molding raw material, the particle size of the powder is all above 100nm, and it needs to rely on the irradiation of an external high-energy beam (laser beam or electron beam) to make the powder melt. The shortcomings of re-solidification molding are as follows: 1) The molding process needs to rely on linear scanning of single or multiple high-energy beams. For each high-energy beam, the powder on its scanning path is sequentially melted and solidified, which is essentially impossible to achieve Parallel molding, so the molding speed is slow and the efficiency is low; 2) Due to the low electro-optic conversion efficiency of lasers and electron beam sources (generally less than 20%), and the high melting point of metal powder, the energy density required for molding is extremely high. High energy consumption; 3) Due to the use of micron-sized metal powder, the high melting point of the powder makes the metallurgical quality of the molten pool and the surface roughness of the molding process not high, and it is easy to generate residual stress accumulation, thermal stress deformation, and internal thermal stress. Defects such as cracks; 4) Due to the thermal stress deformation problem, the size of the molded parts is limited, otherwise the molded parts that meet the dimensional accuracy requirements cannot be obtained

Images