Optimal design of atmosphere protection system for selective laser melting device based on FLUENT

FU Wangqi; LI Tengfei; QIAN Bo; LI Bo

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Optimal design of atmosphere protection system for selective laser melting device based on FLUENT
Vol. 49, Issue 9, Pages: 78-83(2019)
DOI：

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FU Wangqi, LI Tengfei, QIAN Bo, et al. Optimal design of atmosphere protection system for selective laser melting device based on FLUENT. [J]. 49(9):78-83(2019)
DOI：

FU Wangqi, LI Tengfei, QIAN Bo, et al. Optimal design of atmosphere protection system for selective laser melting device based on FLUENT. [J]. 49(9):78-83(2019) DOI：

摘要

气氛保护系统是激光选区熔化(Selective Laser Melting,SLM)设备的重要功能单元,保证了SLM成型必需的低氧环境,直接影响SLM成型件的性能。针对提出的进气口数量和位置不同的4种方案,借助FLUENT软件模拟分析了保护性气体在成型腔体中的流场状态及其对SLM成型过程的影响,并确定了最优方案。结果表明:采用5个进气口,1个位于右后侧,4个分布在顶部,且分别按照进气量占比3/4、1/4时充气最快,对烟尘清除效果最好。

Abstract

Atmosphere protection system is a vital functional unit of selective laser melting（SLM）devices,which ensures the low oxygen environment necessary for SLM processing and affects the performance of SLM formed parts directly. The four options with different number and position of the inlets are simulated by FLUENT. The flow field state of the inert gas in the chamber and its influence on the SLM forming process are simulated,and the optimal option is determined. The results show that the shortest inflating time and the best dust removal effect will be obtained when adopting five inlets: one on the right rear side and four on the top of the chamber,and the intake air volume accounts for 1/4,3/4 of the total,respectively.