Dynamic evolution simulation of sintering pool in selective laser sintering walnut shell/Co-PES composite. (December 2021)

• Record Type: Journal Article
• Authors: Yu, Yueqiang; Jiang, Minzheng; Wang, Suling; Guo, Yanling; Jiang, Ting; Zheng, Ziming; Huang, Shuaiqi; Cui, Tianqi; Sha, Kun
• Is Part Of: Optics & laser technology. Volume 144(2021)
• Publication Date: 2021-12
• Subjects: 3D printing -- Selective laser sintering -- Walnut shell -- Temperature field -- Sintering pool; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2021.107425
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: A double ellipsoid heat source model was proposed to simulate the morphology of sintering pool effectively. Numerical models of surface heat source and body heat source by laser sintering were established. The sintering pool dynamic evolution law of WSPC composite powder was obtained. The influence of process parameters on the sintering pool morphology and temperature field of WSPC composite powder was discussed. Abstract: In view of the difficulties in the observation of sintering pool and too many factors influencing the dynamic evolution process of sintering pool during the selective laser sintering (SLS) process of biomass composite materials, the structural morphology of sintering pool during the SLS process of walnut shell/Co-PES (WSPC) powder and its dynamic evolution process were studied. Based on the DFLUX subprogram, a moving double ellipsoid heat source model was established. Considering heat conduction, heat radiation, heat convection and thermophysical parameters changing with temperature, the three-dimensional finite element model of WSPC powder was numerically simulated in the process of SLS. Through numerical simulation analysis, the surface shape of sintering pool is circular and the cross section one is deep bowl, and the sintering forming process is a process in which the sintering pool is continuously superposed along the sintering direction. By comparing the experimental results with the numerical simulated results, the experimental results are in good agreement with the simulated results. The dynamic evolution law of sintering pool during SLS process of WSPC powder and the change law that sintering pool size increases with the increase of preheating temperature and laser power and the decrease of scanning speed were obtained.