Three-dimensional printing formation method based on induction heating and used for metal nanopowder

Abstract

The invention provides a three-dimensional printing formation method based on induction heating and used for metal nanopowder. The three-dimensional printing formation method based on induction heating and used for the metal nanopowder comprises the steps that CAD data files, a formed substrate, the metal nanopowder and a nanopowder jet array plate for three-dimensional printing formation of a part are prepared; internal block-by-block filling is conducted on each closed outline pattern of each layer of slice; the formed substrate and a formed part are kept at a preset temperature through heating in a vacuum formation cavity; and slice data of the current slice are obtained, corresponding powder delivery nozzle jet valves are controlled to be opened according to corresponding small blocksformed after the current slice is cut, solidification occurs while the metal nanopowder is molten and molten metal is leveled, and the thicknesses of the corresponding small blocks are increased by acertain degree. According to the three-dimensional printing formation method based on induction heating and used for the metal nanopowder, the process thinking that the temperature of the formed substrate and the formed part is kept below the melting point of the blocks and above the melting point of the metal nanopowder is ingeniously utilized, a high-energy beam for assisting melting is not needed, and three-dimensional formation of ultra fine and ultra-high-speed parts is achieved based on the metal nanopowder.

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...

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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

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