Laser powder bed melting additive manufacturing molten bath monitoring and pore controlling method

Abstract

The invention discloses a laser powder bed melting additive manufacturing molten bath monitoring and pore controlling method. The method includes the steps that (1) a space powder bed three-dimensional geometrical model is established; the powder model is guided into a thermal fluid model, a thermal fluid model of the powder dimension is established, the initial and boundary conditions of computational domains are set, and meshing is performed; a powder bed melting process three-dimensional model governing equation is established, and a molten bath is simulated according to the governing equation and input parameters; (2) three-dimensional profile data, including the molten bath depth, width and length, of the molten bath are extracted according to the solidus temperature and the mesh temperature of powder and a base material at each time step; and (3) a final scanning interval is obtained according to the three-dimensional profile data of the molten bath, and an ultimate molten bath is simulated according to the governing equation, the input parameters of the step (1) and the final scanning interval. In view of the difficulties of long time and high cost of the powder bed meltingexperimental research, the reliability of a solution can be evaluated, the research and development cost can be reduced, and the forming parameters are optimized.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing, and relates to a pore control method, in particular to a laser powder bed fusion additive manufacturing molten pool monitoring and pore control method. Background technique [0002] As a branch of 3D printing technology, powder bed fusion forming adopts the method of presetting the powder bed, and uses high-power laser beams to directly melt all metal powders without adhesives. It has the advantages of fast manufacturing, high density of formed parts, and high manufacturing accuracy. , can form parts of arbitrary complex shapes and other advantages. Although this technology has many unique advantages, and with the rapid development of laser melting technology, this forming process has begun to be commercialized, but there are still some problems in the manufactured parts at this stage, such as deformation, cracking, porosity, etc. Structural defects. In the powder bed melting process...

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This is not good for accelerating the rapid development of laser powder bed fusion additive manufacturing

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