期刊
MATERIALS & DESIGN
卷 196, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.109147
关键词
Laser powder bed fusion; Manufacturability; Conformal cooling; Large channel; Porous structure
资金
- Guangdong Province Key Field Research and Development Program Project [2020B090922002]
- National Natural Science Foundation of China [51775196, 52005189]
- Guangdong Province Basic and Applied Basic Research Fund Project [2019A1515110542, 2019B1515120094]
- Chinese Postdoctoral Science Foundation [2020M672617]
- High-level Personnel Special Support Plan of Guangdong Province [2016TQ03X289]
- Guangzhou Science and Technology Society Project [X20200301015, 202007020008]
- Guangdong province Science and Technology Plan Projects [2019A1515011841, 2017B090911004]
- Guangdong Academy of Science Project [2018GDASCX-0402]
Additive manufacturing (AM) offers high-freedom in the design and processing of components with complex internal structures. In this work, a new injection mold with the self-supporting large cooling channel and tailored porous structures was designed to improve cooling efficiency and save AM build costs. The optimized internal supports suppressed the collapse and warpage of large channels, which improves the manufacturability and breaks the geometric constraints of laser powder bed fusion (LPBF). The formable diameter of self-supporting channels is significantly increased (>= 20 mm). In comparison to the 8 mm normal-sized channel, the selfsupporting 13 mm channel reduces the cooling time of more than 20%. Additionally, the porous diamond structure was designated in the assembly part of the mold to save the materials and build time. To tune the strength, a core-shell composite structure with solid shell surrounding inner porous structures is designed. The influence of the wall thickness on the mechanical property of the composite structure was explored, which guides the specific mold design. Finally, a mold with the above-mentioned novel design was successfully processed by LPBF, which substantiates the manufacturability of innovative design. This work also inspires other industrial applications of AM-processed components with improved performance and functionality. (c) 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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