A metal 3D printing method based on the nano-temperature size effect

Abstract

The invention provides a metal three-dimensional printing forming method based on nano temperature dimension effect. The method comprises the following steps that a CAD data file, a forming substrateplate, a metal nano powder and a nano powder jetting array plate of the three-dimensional printing forming part are prepared; the forming substrate plate and the formed part are kept at a set temperature all the time through heating; and the slice data of a current slice are taken, a corresponding micro-tube injection valve is controlled to be opened according to a corresponding segmented small block, so that the metal nano powder flows out from the micro tube, then the current forming surface is vertically impacted, the current forming surface is fused into a whole through melting, leveling and solidification, the corresponding block is enabled to increase a certain thickness, and repeating is carried out until all the layers are formed completely. According to the method, the technologyideology that the forming substrate plate and the formed part are lower the melting point of a block body and higher the melting point of the metal nano powder are skillfully utilized, a high-energy beam auxiliary melting effect is not needed, and the super-fine and ultra-high-speed three-dimensional part three-dimensional forming based on the metal nano powder is realized.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a metal three-dimensional printing forming method based on the nanometer temperature size effect. 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 ...

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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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