Internally-arranged automatic coating device and method based on 3D printing of precious metal

Abstract

The invention discloses an internally-arranged automatic coating device and method based on 3D printing of precious metal. The device comprises a forming chamber, a powder laying mechanism and a datum horizontal plate; a closed powder storage box is arranged below a powder outlet of a powder box body, and a quantitative powder feeding mechanism is arranged between the powder outlet of the powder box body and the closed powder storage box; a structure shaped like a Chinese character 'hui' is formed by the enclosure of the peripheral side walls of the closed powder storage box, and two powder coating scrapers are installed on the front side wall and the rear side wall of a lower opening in the powder laying direction; the peripheral side walls of the closed powder storage box, the two powder coating scrapers and the datum horizontal plate form powder storage space; the powder coating scrapers flattens powder from the powder box body uniformly back and forth with the datum horizontal plate as the datum plane. The device integrates the quantitative powder feeding function and the efficient powder laying function and can effectively increase the utilization rate of the precious metal and reduce material waste when applied to the 3D printing process of the precious metal.

Description

technical field [0001] The invention relates to powder supply and powder spreading components in metal 3D printers, in particular to a built-in automatic coating device and method based on precious metal 3D printing. Background technique [0002] With the rapid development of 3D printing technology, metal 3D printing technology using metal powder as raw material has received more and more attention. The main principle of metal 3D printing technology is to uniformly accumulate metal powder layer by layer in the molding cylinder, and use laser scanning to scan the cross-sectional area under the control of the computer, so that the metal powder in the scanned area is bonded or melted to obtain a single-layer cross-section of the molded part. shape, then the forming cylinder descends to a certain height and repeats the above process until all parts are formed. In the molding process, the powder spreading method is one of the main factors affecting the molding accuracy. The amou...

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Problems solved by technology

The roller-type powder spreading method has a better compaction effect, but it is easy to cause uneven powder spreading when there are defects such as warping or protrusions on the forming plane; the scraper-type powder spreading method has a better flattening effect, but it is easy to cause waste of powder , which is very uneconomical when processing precious metal parts; the mobile hopper type is a composite powder spreading method that combines the powder cylinder and the powder spreading device, because the powder spreading method shortens the stroke of the powder spreading device, It can better improve the efficiency of powder spreading, but it also cannot realize the function of saving powder

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