Surface heat transfer coefficient method of metal additive formed parts based on heat flow coupling simulation

Abstract

The invention discloses a method for simulating the surface heat transfer coefficient of a metal additive formed part based on heat flow coupling, which includes the following steps: (1) using a three-dimensional drawing software to prepare a geometric model of the printed part and the flow field around the printed part and perform finite element analysis; (2) ) Assign corresponding material properties to the geometric model; (3) Use tetrahedral mesh division for the geometric model; (4) Establish a heat transfer analysis module for solving the temperature field in the process of metal additive printing; (5) Establish a module for Volume heat source module for simulating the laser heating process in metal additive printing; (6) Establish a fluid analysis module for solving the flow field model in the metal additive printing process; (7) Set the solution time and solve the temperature field and flow field at the same time Get the surface heat transfer coefficient. The surface heat transfer coefficient of the printed part obtained by the present invention provides accurate boundary conditions for numerical simulations (such as heat flow simulations and thermal simulations) related to additive manufacturing, so that the numerical simulation results are 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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