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Symmetrical liquid drop injecting three-dimensional fast shaping method and apparatus thereof

A droplet spraying and forming device technology is applied in the field of rapid prototyping methods and devices for metal parts, which can solve the problems of poor compactness of formed parts, unsatisfactory product quality, and high porosity, and achieve dense structure, rapid solidification structure characteristics, accurate high sex effect

Inactive Publication Date: 2008-03-12
TIANJIN UNIV
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Problems solved by technology

Due to the unevenness of the metal droplets produced by the traditional atomization spray molding technology, the final molded parts have poor density, high porosity, and unsatisfactory product quality.

Method used

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  • Symmetrical liquid drop injecting three-dimensional fast shaping method and apparatus thereof

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Embodiment Construction

[0023] The present invention mainly injects inert gas (such as nitrogen) into the crucible and the vacuum-sealed chamber, and utilizes the pressure control system to make the crucible and the vacuum-sealed chamber reach a stable pressure difference, so that the metal melt flows from the micro-nozzle at the bottom of the crucible to According to the principle of Rayleigh jet instability, the vibration generated by the piezoelectric oscillator is used to disturb the metal jet, so that the metal jet breaks into uniform droplets. The real-time size parameters of the generated droplets are obtained through the monitoring system combined with the computer analysis system, and then for the optimized parameters, the frequency of the oscillator is feedback-controlled to reduce the error between the generated metal droplets and the set droplet size. The metal droplets are charged by the electrode plate induction, and the microcomputer control system controls the electric field parameters...

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Abstract

The present invention belongs to rapid molding field of technology, which especially relates to a rapid shaping method and a device of metal. Inert gas used by the present invention is bled into a crucible and a vacuum tight chamber that can obtain steady differential pressure by means of pressure control system, which makes mental fusant ejected in the form of laminar jet from a micro-nozzle that is positioned on a bottom of the crucible. Vibration disturbance mental shooting flow produced by a piezoelectric oscillator turns metal shooting flow into uniform droplets. And real-time size parameters of the droplets mentioned-above can be obtained by monitoring system and computer analysis system. Subject to the size parameters of part that are input in advance, micro-computer control system has the real-time control for electrical field parameters of a deflexion polar plate, thus, controlling flight profile of the metal droplets and manufacturing metal parts with good quality in cooperation with a three-dimensional control station. The present invention is able to directly turn liquid metal into close-finished metal parts that are provided with rapid coagulation and delicate structure. The present invention has short technological process and products have good quality, which greatly reduces equipment investments.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, in particular to a rapid prototyping method and device for metal parts. Background technique [0002] Rapid prototyping technology uses the principle of material accumulation molding to build up materials layer by layer or point by point to manufacture parts. Due to the non-uniform metal droplets produced by the traditional atomization spray molding technology, the final molded parts have poor density, high porosity and unsatisfactory product quality. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a device capable of directly generating uniform metal droplets from liquid metal, and then rapidly preparing metal parts. [0004] For this reason, the present invention adopts following technical scheme: [0005] A three-dimensional rapid prototyping device for uniform droplet ejection, comprising a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/115B22F9/08
Inventor 吴萍周伟刘立娟李宝凌张洪波
Owner TIANJIN UNIV
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