PRODUCTION OF 3D ARTICLES WITH GRADIENT OF PROPERTIES OF POWDERS AND DEVICE TO THIS END Russian patent published in 2016 - IPC B29C67/04 B29C41/08 B29C41/36 B22F3/105 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to production of articles from powders with the gradient of properties with application of radiation flows and particles, and can be used in their selective sintering or fusion. Proposed method comprises the steps that follow. Selected are the powders of definite diameters and of different materials. Powder plies of definite depth and of different materials of different diameters are consecutively applied at vertical displacement of the working bin piston with the article being sintered. Preset region in the plane of every ply is subjected to programmable selective sintering/fusion. After sintering of preset ply of powder of the given diameter the working bin piston with sintered article is displaced upward by the magnitude of the ply to remove unsintered powder from this ply. Then, the ply of powder of the other diameter and the other material to be selectively sintered. The process is reiterated the required number of times subject to the amount of applied material in the ply to get the sintered regions from powders of different materials in the ply. After sintering of the ply, the abode described jobs are made in the next ply. After sintering, unsintered powder is withdrawn from the working bin to isolate the withdrawn powders by their diameters and different materials. Separated powders are returned to the feed bins for reuse. Claimed device comprises working chamber with intake opening, laser, working bin with piston, feed bin, carriage for feeding and laying of preset-size powder of different materials. It is provided with N powder feeding and laying carriages coupled with the powder feeding and laying carriage to make an integral module of the power feeding and laying, N feed bins and cleaning carriage to displace indirection of said module. It is equipped with the system for removal of powder from the working chamber, powder separation system, separated powder removal system and system to feed separated powder to feed bins for their reuse.

EFFECT: higher powder use factor and quality of produced articles.

4 cl, 2 dwg