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A simulation model of selective laser melting (SLM) of glass silica monolayer

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Abstract

Although experimental research demonstrates the feasibility of processing glass via selective laser melting (SLM), achieving SLM precision manufacturing of fused silica is still a challenging but promising field. Therefore, a numerical model was developed in this work to predict the densification kinetics of glass powder monolayer under SLM, which provided a simulation tool for the optimization design of processing parameters. To be particular, the relative neck diameter and density of the powder bed under SLM were calculated using a cluster model to simulate the degree of consolidation, from which the thermal diffusivity of the powder bed was determined and the corresponding results of heat transfer were obtained through the numerical model implemented by using finite difference method (FDM). The experimental results for the SLM of glass with different processing parameters from other references validated the simulation results with a prediction error of less than 2%. Hence, the effects of processing settings, such as the influence of particle size and preheating temperature, could be accurately investigated by using this numerical modelling method. It was found that using powders with smaller particle sizes and setting a higher preheat temperature could improve the manufacturing quality of the obtained glass parts. From the densification results of the numerical modelling, we also introduced a novel optimization criterion, which could be utilized to optimise the processing parameters and fabricate the high-purity glass parts via SLM.

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Authors and Affiliations

  1. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region, Hong Kong

    Wanrui Zhang

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  1. Wanrui Zhang
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Wanrui Zhang: conceptualization, methodology, formal analysis, investigation, writing.

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Correspondence to Wanrui Zhang.

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Zhang, W. A simulation model of selective laser melting (SLM) of glass silica monolayer. Int J Adv Manuf Technol 131, 381–391 (2024). https://doi.org/10.1007/s00170-024-13076-y

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