A direct-write metal 3D printing method based on induction melting

Abstract

The invention provides a direct writing type metal three-dimensional printing forming method based on induction smelting. The method comprises the steps that a CAD data file of a three-dimensional printing forming part, a forming substrate, metal powder and a direct writing type induction melting forming nozzle are prepared; inner vector line filling is carried out on a closed skeleton diagram ofeach layer of section; a spraying valve corresponding to the current section is controllably opened, the metal powder flows out through an inner powder conveying channel, and through rapid heating smelting of an induction coil, metal drops are formed and near vertically impact the current forming surface of the forming substrate; along the track of the inner filled vector line segment, the directwriting type induction melting forming nozzle and the forming substrate relatively displace, a continuous forming line segment consistent with the inner filled vector line segment is formed, and layer-by-layer stacking is carried out to finish forming. Forming is achieved through relative motion of the nozzle and the forming substrate, the forming size is not limited, precise forming of a large-size part is achieved, the method is flexible and convenient to implement, and the freedom degree is high.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a direct-writing metal three-dimensional printing forming method 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 scien...

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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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