Selective laser melting method

Abstract

The invention discloses a selective laser melting method. The method comprises the steps of (1) paving equivalent metal powder on a base plate through a selective laser melting system; (2) melting theequivalent metal powder paved in step (1) through laser based on the size of a processed workpiece so as to form an outer circle ring layer; (3) melting the inside of the outer circle ring layer obtained in step (2) through laser to obtain a sheet layer of the processed workpiece; and (4) paving metal powder on the outer circle ring layer and the sheet layer of the processed workpiece through theselective laser melting system; and cyclically repeating steps (2) and (3) until the whole processed workpiece is subjected to layered processing. According to the method, the outer circle ring layeris arranged, and a powder storing barrel is formed; the powder can be properly paved based on the size of the processed workpiece, so that the problems of pollution and waste of raw materials in processing and cumbersome recovering and treating of the raw materials can be avoided; and meanwhile, the processing is in-situ carried out from bottom to top in a molding manner; and the problems such aslow processing efficiency and high limitation can be avoided; and the applicable scope is expanded.

Description

technical field [0001] The invention relates to the field, in particular to a selective laser melting method. Background technique [0002] SLM: Selective laser melting (selective laser melting), is a kind of additive manufacturing technology. It is a rapid prototyping technology for metal powder. It can directly form metal parts with close to complete density and good mechanical properties. Its use is high The high-power laser beam processes and fuses a layer of metal powder into a shape. After the fusion is completed, the operating platform is lowered by a distance of one layer thickness, and continues to process the next layer of powder. This step is repeated until all the designated (selected to be processed) areas are melted and casted. Complete, just get a three-dimensional compound. The required products (parts) are accumulated through layer-by-layer processing in this way; in the prior art, the lifting and lowering of the control platform is generally used to realiz...

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a selective laser melting method, which can spread powder in an appropriate amount according to the size of the workpiece to avoid the pollution and waste of processing raw materials and the cumbersome recycling of raw materials. Realize in-situ processing, avoid problems such as low processing efficiency and large limitations, and increase the scope of application

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