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Simplification and experimental investigation of geometrical surface smoothness model for multi-track laser cladding processes
摘要： The formation of large area parts requires construction of multi-track laser cladding layers which are significantly influenced by the overlapping coefficient. The geometrical model of optimal overlap ratio to obtain least surface fluctuation of multi-track claddings is derived into a simpler form in terms of the aspect ratio of single-track clads. The error analysis further demonstrates the effectiveness of these models. Multi-track single layer claddings are fabricated at a series of overlap ratios under two process conditions. The surface states of cladding layers are then evaluated by two types of smoothness definitions with two fitting methods to study the optimal overlap ratios. The results show that the experimental optimum conditions identified by two methods are slightly different from each other. The theoretical prediction is in good agreement with the experimental one when the aspect ratio is great enough to support the model assumptions.
关键词： Laser cladding,Multi-track clads,Overlap ratio,Geometrical model,Surface smoothness
更新于2025-11-28 14:24:20
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Calibration of galvanometric scan heads for additive manufacturing with machine assembly defects consideration
摘要： The calibration of additive manufacturing machines using scanning heads in processes such as Laser Powder Bed Fusion (LPBF) and vat photopolymerization is an iterative and time-consuming process often based on limited physical models. Indeed, the relationship between the laser spot position in the work plane and the actuators position (galvanometers) is achieved by interpolating correction tables experimentally determined. In this paper, representative geometrical models of the real system are established in order to reduce the time required to obtain the final correction tables. For this purpose, a geometrical model is developed with assembly defects consideration. This model is used in a process of defects identification to obtain a virtual machine representative of the real system and thus directly generates the final correction tables. The geometrical model thereby developed is used to quantify the impact of assembly defects on the laser spot position, to compensate them and to reduce the calibration time of an additive manufacturing machine.
关键词： Assembly defects,Additive manufacturing,Geometrical model,Virtual machine,Calibration
更新于2025-09-19 17:15:36
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Systematic Investigation of Close-Packed Silica Nanospheres Monolayer under Sintering Conditions
摘要： In this paper, we have quantified and investigated the effect of various sintering temperature on close-packed Silica Nanospheres (SNs) monolayers. SNs with diameters of 140, 175 and 220 nm were fabricated by an effective and reliable spin-coating technique. The fabricated SNs monolayers were sintered up to 1200°C and were analyzed from FESEM to investigate in details for local and extended transformations in their structural and morphological properties. A distinct "neck-formation" was observed and was quantified with different particle size distribution as well as surface packing density. It was observed that SNs monolayer undergoes intra-particle reformation in the form of shrinkage in individual SNs and compactification of growth domains, followed by inter-particle sintering. A geometrical model was developed to determine the curvature radius and interpenetration depth thus enabling us to quantify the parameters that dominate the dynamics of the sintering process for such non-porous SNs.
关键词： Scanning Electron Microscopy,Geometrical Model,Silica Nanospheres,Sintering
更新于2025-09-10 09:29:36