Device, method and 3D printing system for preparing metal powder by ultrasonic vibration atomization

Abstract

The invention discloses a device, method and 3D printing system for preparing metal powder by ultrasonic vibration atomization, including: an ultrasonic vibration system, an ultrasonic amplitude changing device, a metal wire, a locking system, a wire feeding system and a heat source; the ultrasonic vibration system and The ultrasonic horn is connected, and the ultrasonic horn is cylindrical or at least has a cavity at the front end; the metal wire passes through the cavity through the wire feeding system; a locking device is set on the ultrasonic horn system; said heat source is disposed at an exit location of said cavity. The invention has beneficial effects: the metal wire is used as the load of the horn for ultrasonic vibration atomization, which can be carried out under vacuum conditions, does not consume inert gas, and avoids powder pollution; continuous powder production can be carried out by means of continuous wire feeding.

Description

technical field [0001] The present invention relates to the technical field of metal 3D printing, in particular to a device for preparing metal powder by ultrasonic vibration atomization, a working method and a 3D printing system assisted by it. Background technique [0002] Metal 3D printing (also known as additive manufacturing, rapid prototyping) technologies mainly include wire / powder fusion deposition method and powder selective melting method. The powder selective melting method generally uses a powder making device to prepare spherical powder, and then uses 3D printing equipment to distribute powder, select melting and gradually form parts to obtain the required shape and performance. The powder making and forming processes are generally completed separately in different devices, the process and equipment are very complicated, and the cost remains high. [0003] At present, the methods for preparing spherical powder mainly include inert gas atomization, radio frequen...

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Problems solved by technology

[0009] (1) For the spherical metal powder required for 3D printing, the existing preparation method needs to consume a large amount of inert gas, and the powder is easily oxidized during storage and transportation

[0010] (2) Conventional ultrasonic vibration atomization pulverization is not suitable for high melting point metals; when the metal to be pulverized is directly used as the load of the horn for atomization pulverization, it is difficult to continuous pulverization due to frequency changes due to metal consumption

[0011] (3) Conventional 3D printing technology separates powder making and printing, requires different devices, the cost is too high, and the powder is easily oxidized during storage and transportation

In addition, 3D printing has strict requirements on powder shape and particle size, especially the problem of "powder blowing" in electron beam printing is difficult to solve

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