Method for molding gradient materials by interlayer laser improved selective laser melting

Abstract

The invention discloses a method for molding gradient materials by interlayer laser improved selective laser melting. A laser surface modifying process is integrated with a selective laser melting process; and through a laser modifying mode for rescanning of molded parts by laser beams after molding of a certain number of lasers through selective laser melting at each time, microscopic structuresand performances of different areas of the parts are changed to obtain high-performance parts with different performances and gradients. Meanwhile, through rescanning by the laser beams, such defectsas holes in the layers, micro cracks and surface projections can be eliminated, so that the compactness and the surface quality of the molded parts are improved. The structure and performance change of the parts can be realized through modes of adjusting the set layer number, the laser rescanning power, the laser beam scanning speed and the laser beam scanning gap. When the compactness of the molded parts is improved, the direct molding of multi-performance gradient materials by the selective laser melting technology is realized, and a significant effect on promotion of the industrial technology development is achieved.

Description

technical field [0001] The invention relates to the field of laser selective melting molding, in particular to a method for interlayer laser modified laser selective melting forming gradient materials. Background technique [0002] The traditional laser modification technology mainly changes the properties of the surface of the part, so as to obtain parts that meet certain requirements. Although it can meet some industrial needs, it cannot be changed because it only changes the properties of a thin layer of material on the surface of the part. Due to the nature of the material inside the part, the scope of application is severely limited. [0003] Laser selective melting (SLM) forming technology is a kind of additive manufacturing technology and the latest development technology of rapid prototyping technology. This technology is based on the principle of layer-by-layer accumulation of discrete materials, and according to the three-dimensional data of digital parts designed...

AI Technical Summary

Problems solved by technology

Solve defects such as cavities, microcracks and surface protrusions in the laser selective melting process, and achieve parts with different performance gradients when using a single material for laser selective melting

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