A parallel metal three-dimensional printing method based on induction melting

Abstract

The invention provides a parallel mode metal three-dimensional printing forming method based on induction smelting. The parallel mode metal three-dimensional printing forming method comprises the steps that a CAD data file of a three-dimensional printing forming part, a forming base plate, metal powder and a metal powder induction smelting forming array plate are prepared; a closed outline patternof each layer of slices is subjected to inner partitioning filling; the metal powder is controlled to flow out through a powder feeding nozzle and then is quickly heated and melted through an induction coil, molten metal drops are formed and then almost vertically impact the current forming surface of the forming base plate, that is, the molten metal drops fall into small blocks subjected to partitioning filling, flat flow in the small blocks and then are integrally solidified with the current forming surface, and the thickness of the corresponding small blocks is increased to a certain extent; and the effect that formed parts are stacked from bottom to top layer by layer is achieved through the method. According to the parallel mode metal three-dimensional printing forming method, area array projection powder of the metal powder induction smelting forming array plate is subjected to parallel spraying forming, one-time spraying forming is conducted on each single layer, and the forming speed of the method is greatly increased in order of magnitude compared with the forming speed of traditional methods.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a parallel three-dimensional printing method for metals based on induction melting. 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 science and te...

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Problems solved by technology

[0008] In the existing technology, all kinds of metal 3D printing technologies basically use metal powder as the molding raw material, which needs to rely on the irradiation of external high-energy beams (laser beams or electron beams) to make the powder melt and then solidify and form. The disadvantages are: 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 for molding. Parallel molding cannot be realized in essence, so the molding speed is slow and the efficiency is low. ; 2) Due to the low electro-optical 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, and the actual energy consumption is very high; 3) Due to the use of It is a 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 is prone to defects such as residual stress accumulation, thermal stress deformation, and internal thermal cracks; 4) due to thermal stress deformation The problem is that 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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