High-precision selective laser sintering method and device for ultraviolet point light source

Abstract

Provided are a high-precision selective laser sintering method and device for an ultraviolet point light source. An ultraviolet laser is adopted, a printing model is generated through a computer, and signals are output through control software, thus movement of a scanning galvanometer is controlled, the point light source is formed by laser in a forming cylinder, and powder sintering forming is carried out. The device comprises a preheating system and a powder laying device, the preheating system and the powder laying device are connected with the computer, and the computer is connected with the ultraviolet laser and the scanning galvanometer. The method and device have the advantages that the light spot diameter is small, the heat affected area is small, single photon energy is large, the processing precision is high, the forming quality is good, the processing material range is wide, and the like.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a high-precision selective-area laser sintering method and device for an ultraviolet point light source. Background technique [0002] Selected laser sintering (SLS) is an additive manufacturing technology that has developed rapidly in recent years. It is mainly used in many fields such as machinery, aerospace, and bioengineering, involving various powder materials such as metals, ceramics, and polymers. The existing selective laser sintering technology converges the laser beam into a high-energy spot on the processing plane, and controls the spot through software to scan point by point or line by line according to a certain path. Lasers commonly used in SLS technology mainly include carbon dioxide lasers and fiber lasers. [0003] In the selective sintering process of polymers as processing materials, carbon dioxide lasers are mainly used at present. This type of...

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Problems solved by technology

[0003] In the selective sintering process of polymers as processing materials, carbon dioxide lasers are mainly used at present. This type of laser has high efficiency and a large power range, but the spot diameter is large, the heat-affected area is large, and the forming line width is wider than the design size. High manufacturing precision cannot be achieved

Fiber lasers have high electro-optical efficiency, wide output laser wavelength range, and high stability, but the absorption efficiency of high molecular polymers for this laser wavelength is low, so it is mainly used in sintering of metal powders

[0004] For high molecular polymers with low melting point, the existing SLS technology cannot achieve high molding accuracy

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