Process method and device for powder-bed-type multi-material continuous laser additive manufacturing

Abstract

The invention discloses a process method and device for powder-bed-type multi-material continuous laser additive manufacturing. According to the process method, a powder supplying device of the laseradditive manufacturing equipment adopts two or more powder bins, meanwhile, outlets of the powder bins are provided with measuring bins with weighing devices and a preheating function, in this way, the single discharging amount can be precisely controlled through the weighing devices and an electronic control valve, various powder can be mixed in the measuring bins, and thus layered distributing of different materials in the same cylinder body can be achieved; an automatic powder laying mechanism of the process method adopts a movable plate which moves circularly in the up and down direction to serve as the powder supplying device for bearing the powder discharged by the measuring bins, the powder falls off the measuring bins when the movable plate lifts up, the powder is flat laid on theinclined movable plate, after the movable plate moves to the horizontal state, the powder is scraped to a forming cylinder through a scraping plate, and thus material laying in the same cylinder bodycan be achieved.

Description

technical field [0001] The invention relates to a process method and equipment for continuous laser additive manufacturing of various materials in a powder bed, and belongs to the technical field of additive manufacturing. Background technique [0002] Additive Manufacturing (AM), commonly known as 3D printing, is a manufacturing technology that accumulates metal or non-metallic materials layer by layer according to extrusion, sintering, melting, light curing, spraying, etc. to produce physical objects. Compared with the traditional processing mode of raw material removal-cutting and assembly, it is a "bottom-up" manufacturing method through material accumulation, and compared with traditional material removal processing and deformation processing, layer-by-layer processing Additive manufacturing technology has many advantages such as direct manufacturing process without tools and molds, not limited by the complexity of the structure, providing more freedom for design innova...

AI Technical Summary

Problems solved by technology

The existing powder-based additive manufacturing powder coating technology has the following disadvantages: (1) The existing equipment uses two cylinders—the forming cylinder and the powder feeding cylinder. After the product is processed, in order to ensure that the product is formed , The molding cylinder needs to be gradually cooled during the process of passing the protective gas. The general cooling time is as long as 12-24 hours, and the cooling time for larger-sized files may even exceed 24 hours, resulting in low production efficiency of existing equipment and cannot be continuous Production; (2) During the air supply process of the powder feeding cylinder, when the powder material is spread to the forming cylinder by the powder spreading roller, excess powder will be scraped out of the forming cylinder to the collection tank. It will lead to the lack of material in the powder supply cylinder in the later stage, and there is no relevant emergency device, which will lead to the failure of product construction

(3) The existing additive manufacturing technology uses a single material to manufacture layer by layer in the manufacturing process, which leads to high production costs for mechanical parts for some purposes, which in turn affects the promotion of additive manufacturing

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