New Trajectories in Electron Beam Melting Manufacturing to Reduce Curling Effect

Abstract

International audiencePreviously reserved to the manufacturing of prototypes, since few years, additive manufacturing is used to manufacture metallic parts. It is the case of the Electron Beam Melting (EBM) process that is studied in this paper. The transition from prototypes to functional parts has led to increase the requirements on the produced parts. The quality of the built material has to be controlled, the geometrical tolerancings decrease and the residual stresses try to be limited. This article will focus on current main quality problem: the deformations of the part during its built due to thermal effects. The aim of this article is to show the interest to use specific melting strategies, and especially specific beam trajectories to reduce these thermal effects. First the current solution to avoid these deformations (support structures) will be discussed. In a second part the thermal phenomena causing deformations of the part will be explained in order to propose a new strategy to limit deformations in the third part. This strategy is based on the modulation of the energy input using specific beam trajectories

A Conceptual Design and Modeling Framework for Integrated Additive Manufacturing

“…An option is to reduce the energy input (q). The study of Béraud et al confirms the effect of the heat energy input on curling defects [46]. They investigated the beam trajectory as an important parameter influencing the energy input [46].…”

“…technologies. It occurs in the areas of the parts that are not supported by material: [46]. Considering an efficient support structure is another way to reduce this defect.…”

“…The study of Béraud et al confirms the effect of the heat energy input on curling defects [46]. They investigated the beam trajectory as an important parameter influencing the energy input [46]. The 'porous material' principle suggests using a porous structure, lattice structure, or topology-optimized structure for the part.…”

Production Management Fundamentals for Additive Manufacturing

“…Other authors investigated the effects on geometrical tolerances due to the thermal deformation of the melting process for the materials in the production chamber [10]. Other researchers [11] investigated the geometric errors of cylindrical shape dependent by the passage from the CAD model to the triangular shape for stereolithography and they built a new procedure to minimize it.…”

Modeling of the Product Termomechanical Behavior During 3d Deposition of Wire Materials in Ansys

“…Известны исследования, направленные на моде-лирование процессов послойного синтеза [25][26][27][28] и оптимизацию термического цикла [29], оценку влияния параметров процессов на изменение формы готового изделия [30].…”