Vapor-assisted metal micro-droplet manufacturing device and method

Abstract

The invention discloses a vapor-assisted metal micro-droplet manufacturing device and method and belongs to a micro-droplet jetting additive manufacturing technology. The inside of a seal box body is kept in a closed environment to keep an internal temperature invariable; a liquid metal is stored in an inner crucible, an inert gas with pulsating pressure is introduced from a pulsating pressure gas inlet, and the liquid metal is extruded to flow outside from a liquid outlet; a certain distance is kept between an outer crucible and the inner crucible; a heater wraps the outside of the outer crucible to keep the temperature of an internal environment constant; a high-pressure gas flows from an air inlet passage and a flowing metal liquid is extruded and sheared at a liquid outlet; the high-pressure gas flows outside from an air leakage passage and generated micro-droplets flow outside from a droplet outlet and fall to a deposition platform. Through the viscous shearing action of the gas around the liquid outlet, advanced shear fracture of the liquid is achieved at a droplet formation stage, smaller uniform micro-droplets are generated, improvement of the accuracy and the compactness of a formed part is facilitated, a metal lattice structure is more uniform and the mechanical property is better.

Description

technical field [0001] The invention relates to a manufacturing device and method of metal micro-droplets assisted by inert gas, which are used in the micro-droplet injection additive manufacturing technology to realize the deposition of metal micro-droplets and form 3D solid shaped parts. Background technique [0002] Metal droplet jet manufacturing technology is a 3D printing technology developed based on the principle of inkjet printing. It is based on the forming principle of "discrete-superposition". Firstly, the liquid metal is controlled to generate uniform micro-droplets, and then the micro-droplets are deposited on a specific position of the substrate through the movement of the substrate, so as to realize point-by-point and layer-by-layer accumulation to form complex three-dimensional entities. structure. This technology has the advantages of simple process flow, low production cost, high density of formed parts, and good mechanical properties. It has broad applic...

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Problems solved by technology

[0003] Although the micro-droplet injection technology of non-metallic materials has been maturely applied, metal materials have the characteristics of high melting point, high viscosity and high surface tension, and the formation process of metal micro-droplets involves changes in temperature and metal morphology, which is affected by many factors. Coupling effects, mature non-metallic material injection devices and control methods are difficult to be directly used in the injection manufacturing of metal materials

For metal micro-droplet jet manufacturing technology, uniform, stable and small-sized metal micro-droplets are the key to improving the quality of formed parts. A large number of scholars at home and abroad have proposed a variety of methods to control the size of micro-droplets. However, due to the nozzle hole processing technology and the limitation of the micro-droplet generation method, the diameter of the micro-droplet is difficult to reduce uniformly

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