Liquid raw material spraying method and device used for three-dimensional printing

Abstract

The invention discloses a liquid raw material spraying method and device used for three-dimensional printing. The liquid raw material spraying method comprises the steps that liquid raw materials inside a runner are sprayed out of the runner, liquid sections or liquid drops are formed outside the runner, and the spraying process is controlled by a control circuit. The method is characterized in that the liquid raw materials are totally or partially connected into a gasification circuit in the runner, the liquid raw materials connected into the gasification circuit have the areas with higher resistance, currents of certain strength are applied to the liquid raw materials connected into the gasification circuit, the higher resistance areas of the liquid raw materials are totally or partially gasified, and impact force generated by gasification is used for pushing the liquid raw materials to be out of the runner, so that spraying of the liquid raw materials is achieved. High-speed spraying of the liquid raw materials in the 3D printing field, especially the high-speed controllable spraying of materials with a high melting point is achieved; flexible control over liquidity of the liquid raw materials is achieved; raw material drops with small sizes can be generated; and the structure is simple, stability is high, and safety is high.

Description

technical field [0001] The invention relates to liquid raw material jetting technology in three-dimensional printing technology, in particular to a liquid raw material jetting method and device for three-dimensional printing, belonging to the technical field of additive manufacturing. Background technique [0002] 3D printing technology first originated in the United States at the end of the 19th century, and was perfected and gradually commercialized in Japan and the United States in the 1970s and 1980s. Common mainstream 3D printing technologies, such as stereolithography (StereoLithography Apparatus, SLA), fused deposition manufacturing (Fused Deposition Modeling, FDM), selective laser sintering (Selecting Laser Sintering, SLS), three-dimensional powder bonding (Three DimensionalPrinting and Gluing, 3DP), was commercialized in the United States in the 1980s and 1990s. In the technology of realizing 3D printing by stacking molten raw materials, such as common FDM plastic ...

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Problems solved by technology

[0004] There is also a liquid raw material injection method based on electric field force, such as "electric field injection" technology (referring to the book "electric field injection", author Li Jianlin, Shanghai Jiao Tong University Press, 2012), and for example, the application number is 201610224283.7 (the name is "a kind of liquid Metal printing equipment"), application number 201310618953.X (named "a high-voltage electrostatic drive and variable diameter 3D printer") and other Chinese patent applications also use electric field drive technology; these technologies are all in the nozzle (the nozzle must use A high-voltage electrostatic field or a pulsed high-voltage electrostatic field is established between the non-conductive material) and the external electrode (the printing support platform is used as an electrode) to realize the injection of liquid raw materials; but "electric field injection" also has limitations, for example: due to the liquid Raw materials are viscous, especially liquid metals with high surface tension. A high-voltage electrostatic field, or even an ultra-high-voltage electrostatic field must be applied to generate the pulling force required to overcome the viscous force and surface tension of the liquid raw material and generate a certain flow velocity; the presence of a high-voltage electric field Dangerous, prone to electrical breakdown, low controllability; due to the low controllability of the high-voltage electric field, the controllability of the electric field spraying process is not high, and the control of the generated droplets is not high

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