Path optimization method for a metal droplet multilayer deposition process

Abstract

The invention discloses a path optimization method for a metal droplet multilayer deposition process, which reduces the problem of non-uniform thermal stress distribution caused by discrete solidification time distribution and avoids deformation or failure of a sample piece after production. The method comprises the following steps: firstly, establishing a numerical model of a metal droplet multilayer spreading process by adopting a life-death unit method and a lattice Boltzmann equation; and simulating the phase change process of the metal unit in the sample piece according to the geometric structure of the sample piece and the thermophysical parameters of the material, and carrying out post-processing on the data to obtain the solidification time of each unit, and calculating the solidification time standard deviation under the deposition path scheme, and adjusting the original deposition path according to the geometric structure of the sample piece and the obtained solidification time distribution condition, repeating simulation and post-processing steps, and comparing the obtained solidification time standard deviation with the original scheme, and repeatedly adjusting the deposition path scheme to obtain an optimized path scheme according to actual production requirements.

Description

technical field [0001] The invention relates to a deposition path optimization method in the multilayer deposition process of metal droplets, which can reduce the dispersion degree of solidification time distribution of metal units. The invention belongs to the field of metal additive manufacturing. Background technique [0002] Metal additive manufacturing technology is a direct forming manufacturing technology, which has the advantages of simple forming process, fast speed and low loss, and has attracted much attention in the aviation, aerospace and automotive industries. This technology can combine computer-aided design (CAD) and computer-aided manufacturing (CAM) technology, and use layer-by-layer deposition to complete the manufacture of complex three-dimensional structures. [0003] The Metal Droplet Deposition Method based on Drop-on-Demand not only inherits the advantages of metal additive manufacturing technology, but also does not require expensive energy sources ...

AI Technical Summary

Problems solved by technology

[0004] In the process of multi-layer spreading of the sample using the metal droplet deposition manufacturing technology, the solidification time of the droplet is affected by factors such as the deposition position and the interface temperature difference, and it is difficult to achieve uniform distribution.

Excessive discretization of solidification time will lead to uneven distribution of thermal stress, and even lead to risks such as deformation of the sample and degradation of mechanical properties

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