发表刊物：Particuology
收录刊物：SCI
学科门类：工学
一级学科：机械工程
文献类型：J
卷号：74
页面范围：164-172
关键字：Additive manufacturing；Powder paving；Packing quality；Powder bed；Inclination angle；In-situ measurement
DOI码：10.1016/j.partic.2022.07.001
发表时间：2022-08-03
影响因子：3.251
摘要：In this work, in-situ experimental tests are first performed to investigate the powder spreading process of additive manufacturing, where different kinds of scrapers and spreading speeds are employed. Detailed kinetic behaviours of individual powder particles are discussed by discrete element method simulations. It is found that the decrease of inclination angle of the scraper improves the powder pressure and compaction in the spreading process, leading to a denser powder flow and thus a denser powder bed. The increase of spreading speed also improves the powder pressure and compaction in the spreading process. However, the powder flow becomes looser due to the volume dilation, and thus the quality of the paved powder bed decreases. In industrial applications, if the higher powder spreading speed is employed to improve the processing efficiency, the scraper with a smaller inclination angle can be used to ensure the powder bed quality.
发布期刊链接：https://doi.org/10.1016/j.partic.2022.07.001