Calibration method and data measurement device for finite element thermal-mechanical coupling model of high energy beam additive manufacturing

Abstract

The invention shows a checking method and checking data measurement apparatus of a high-energy-beam additive-manufacturing finite-element thermal coupling model. The apparatus comprises a workbench, afixture system and a data acquisition system, wherein the fixture system and the data acquisition system are installed on the workbench. In addition, the checking method includes: step one, carryingout real-time experiment measurement on a fusion covering process and heat-deformation-strain during high-energy-beam additive-manufacturing processing; step two, establishing a model framework, inputting a material property, and dividing a grid, and completing calibration of a finite-element temperature field; and step three, setting a force field boundary condition and using a calibrated temperature field results as an initial condition, obtaining a substrate deformation and strain field results, completing calibration of a finite-element force field, and thus completing calibration of a high-energy-beam additive-manufacturing finite-element thermal coupling model. According to the invention, reliable experiment data are provided for simulation of the high-energy-beam additive manufacturing; the scientific guidance is provided for establishing a process method for controlling deformation of the substrate and finished elements effectively; and thus application of the additive-manufacturing technology is prompted.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a method for calibrating a finite element thermal-mechanical coupling model of high-energy beam additive manufacturing and a data measuring device thereof. Background technique [0002] High-energy beam additive manufacturing technology is a high-performance metal additive manufacturing technology developed based on the principle of rapid prototyping technology. It can be divided into two types: pre-powder powder and synchronous powder feeding or wire feeding. High-energy beams generally include plasma beams, electron beams, Laser beams and arcs etc. For high energy beam additive manufacturing simultaneous powder feeding or wire feeding technology, the formed parts are clad and formed on the prefabricated substrate. During the cladding process, the area near the molten pool is subjected to uneven rapid cooling and rapid heating, the molten pool solidifies and shrinks, the t...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no complete set of heat-deformation-strain in-situ real-time measurement device for the high-energy beam additive manufacturing process. The existing high-energy beam additive manufacturing in-situ measurement technology mainly measures the temperature and deformation of the substrate, and there are few In-situ real-time measurement of temperature and strain of formed parts

At present, most scholars use surface profilometers, laser 3D scanners and other means to obtain the final deformation of the substrate after the additive manufacturing process. This method can only measure the deformation of the substrate after processing, but cannot reveal Real-time deformation law of machined parts

Some scholars use displacement sensors to measure the deformation of the substrate in real time, but they can only measure the deformation of the substrate.

The current in-situ measurement methods are relatively single and have great limitations. They cannot monitor the evolution of the thermal field in the whole field, and cannot provide a full set of experimental verification data for the finite element thermal-mechanical coupling model of additive manufacturing.

[0004] In general, with the development of high-energy beam additive manufacturing, the deformation and even cracking of formed parts during the forming process has not been effectively solved, which seriously affects the progress of the forming process and the quality of formed parts.

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