A Method for Monitoring Melt Pool and Controlling Pores in Laser Powder Bed Fusion Additive Manufacturing

Abstract

The invention discloses a melting pool monitoring and pore control method for laser powder bed fusion and additive manufacturing. Step 1: Establish a three-dimensional geometric model of a powder bed in space; import the powder model into a thermal fluid model to construct a powder-scale thermal fluid model, and set Calculate the initial and boundary conditions of the domain, and perform grid division; construct the control equation of the 3D model of the powder bed melting process, and simulate the molten pool according to the control equation and input parameters; step 2, for each time step, according to the powder and the substrate The solidus temperature and grid temperature of the molten pool are extracted to extract the three-dimensional profile data of the molten pool, including the depth, width and length of the molten pool; step three, obtain the final scanning distance according to the three-dimensional profile data of the molten pool, according to the control equation, the input parameters of step one and The final scan spacing, simulating the final melt pool. The present invention can aim at the difficulties of time-consuming and high-cost powder bed melting experiments, evaluate the reliability of solutions, reduce research and development costs, and optimize forming parameters.

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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