Metal additive forming part surface heat transfer coefficient simulation method based on heat flow coupling

Abstract

The invention discloses a metal additive forming part surface heat transfer coefficient simulation method based on heat flow coupling. The method comprises the following steps: (1) compiling a geometric model of a printed part and a flow field around the printed part by utilizing three-dimensional drawing software, and carrying out finite element analysis; (2) endowing the geometric model with corresponding material attributes; (3) performing tetrahedral mesh division on the geometric model; (4) establishing a temperature field heat transfer analysis module for solving the metal additive printing process; (5) establishing a volume heat source module for simulating a laser heating process in metal additive printing; (6) establishing a fluid analysis module for solving a flow field model in the metal additive printing process; and (7) setting solving time and solving the temperature field and the flow field at the same time to obtain a surface heat transfer coefficient. The printed piece surface heat transfer coefficient obtained by the method provides accurate boundary conditions for numerical simulation (such as heat flow simulation and thermal simulation) of additive manufacturing, so that the numerical simulation result is accurate.

Description

technical field [0001] The invention relates to the technical field of metal additive printing, in particular to a method for simulating the surface heat transfer coefficient of a metal additive formed part based on heat flow coupling. Background technique [0002] Metal laser additive manufacturing technology is an emerging processing and manufacturing technology. Compared with traditional subtractive technology, it has the following characteristics: (1) It can process and manufacture complex inner cavity structures; (2) It can process slender and thin-walled structures ; (3) Damaged parts can be repaired. In actual production and manufacturing, due to the variability of the processing environment, the printed parts have defects such as voids, cracks, and poor melting. Therefore, it is necessary to explore the factors that affect the quality of the processed parts from the perspective of computer simulation. [0003] When simulating metal additive manufacturing, accurate t...

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Problems solved by technology

[0004] When simulating the temperature field, the input data include the thermal conductivity, specific heat capacity, density, laser heat source parameters, surface heat transfer coefficient, and material emissivity coefficient of the material; and the surface heat transfer coefficient is difficult to obtain directly through experiments. , are usually replaced by empirical values, so there is a large error

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