Numerical simulation method for predicting selective laser melting single-melt-channel forming defect

Abstract

The invention provides a numerical simulation method for predicting a selective laser melting single-melt-channel forming defect. The method comprises the steps that S1, establishing a powder bed particle model through EDEM software; s2, selecting a powder bed particle material, and gridding the powder bed particle model; s3, establishing a multi-physical-field model for simulating required heat transfer and molten pool driving force; and S4, selecting laser power and scanning speed as objects to respectively simulate multiple groups of different process parameters. The invention provides a numerical simulation method for predicting the selective laser melting single-melt-channel forming defect, the powder bed model is established through a discrete element method, a heat transfer and molten pool driving force multi-physical-field model is constructed, and numerical simulation is carried out on single-melt-channel forming to obtain a final morphology result; and the formed single meltchannel is evaluated, the defect phenomenon is analyzed, and reference is provided for optimization of technological parameters.

Description

technical field [0001] The invention belongs to the field of selective laser melting, and in particular relates to a numerical simulation method for predicting forming defects of a single melting channel in selective laser melting. Background technique [0002] Laser selective melting is the use of laser beams to melt the metal powder pre-laid on the two-dimensional cross-section according to the predetermined path, melting and solidifying layer by layer from bottom to top to form solid parts; in SLM molding, the most basic molding unit of single melting channel , the molding defects of single melt channel directly affect the final product quality, and the construction of high-quality single melt channel is an indispensable condition for the successful printing of metal parts; numerical simulation can intuitively and quickly predict the defect phenomenon in single melt channel forming , to provide a reference for the selection of process parameters; however, most of the exis...

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Problems solved by technology

[0002] Laser selective melting is the use of laser beams to melt the metal powder pre-laid on the two-dimensional cross-section according to the predetermined path, melting and solidifying layer by layer from bottom to top to form solid parts; in SLM molding, the most basic molding unit of single melting channel , the molding defects of single melt channel directly affect the final product quality, and the construction of high-quality single melt channel is an indispensable condition for the successful printing of metal parts; numerical simulation can intuitively and quickly predict the defect phenomenon in single melt channel forming , to provide a reference for the selection of

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