A built-in automatic coating device and method based on precious metal 3D printing

Abstract

The invention discloses a built-in automatic coating device and method based on precious metal 3D printing, comprising a molding chamber, a powder spreading mechanism, and a reference horizontal plate; There is a quantitative feeding mechanism between the powder outlet of the powder box body and the powder closed storage box; the surrounding side walls of the powder closed storage box are enclosed to form a back-shaped structure, and the front and rear sides along the powder spreading direction are located at the lower opening. There are two powder coating scrapers installed on the wall respectively; the surrounding side walls of the powder closed storage box, the two powder coating scrapers and the reference horizontal plate constitute the powder storage space; the powder coating scraper removes the powder from the powder box body to the benchmark The horizontal plate is the datum plane, and it is evenly scraped back and forth. The device integrates the functions of quantitative powder supply and efficient powder spreading. It can effectively improve the utilization rate of precious metal materials and reduce the waste of materials when applied to the 3D printing process of precious metals.

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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