Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jallcom.2020.157133
Title: A novel method to improve the removability of cone support structures in selective laser melting of 316L stainless steel
Authors: Cao, Qiqiang
Shi, Zhuoqi
Bai, Yuchao 
Zhang, Jiong 
Zhao, Cuiling 
Fuh, Jerry Ying Hsi 
Wang, Hao 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Chemistry
Materials Science
Support removal
Support structures
Post-processing
Corrosion
316L stainless steel
Selective laser melting
CORROSION BEHAVIOR
CUTTING FORCES
MECHANICAL-PROPERTIES
TITANIUM-ALLOYS
MICROSTRUCTURE
SIMULATION
RESISTANCE
ALUMINUM
ENERGY
Issue Date: 15-Feb-2021
Publisher: ELSEVIER SCIENCE SA
Citation: Cao, Qiqiang, Shi, Zhuoqi, Bai, Yuchao, Zhang, Jiong, Zhao, Cuiling, Fuh, Jerry Ying Hsi, Wang, Hao (2021-02-15). A novel method to improve the removability of cone support structures in selective laser melting of 316L stainless steel. JOURNAL OF ALLOYS AND COMPOUNDS 854. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jallcom.2020.157133
Abstract: In selective laser melting (SLM), support structures play a critical role in successful printing. Despite its necessity, the removal of support structures after printing becomes a challenging task which is usually time-consuming and labour-intensive. Mechanical post-processing can be employed to facilitate the automatic removal of support structures with higher efficiency. However, the mechanical forces of a machining process such as milling can cause the cone supports to tilt, collapse and be pulled up. This paper presents a novel method to improve the machinability of cone support structures. In this method, the epoxy resin is filled into the gaps between the entire cone support structures to form a solid composite structure after the epoxy resin is fully cured. The relationship between the force components in various directions during support removal is theoretically analyzed. The method is studied in terms of cutting performance, cutting force and energy, tool wear, workpiece surface damage and corrosion behaviour. On top of rectifying the problems of resultant support tilting and collapsing, the cutting force, specific cutting energy, tool wear and damage to the workpiece surface are significantly reduced, and the corrosion behaviour of the samples is slightly improved due to better surface quality after support removal. A finite element model is constructed for analysis of the underlying mechanisms. This paper addresses the research gap on the corrosion behaviour of the workpiece after support removal, and the newly developed method can be further applied to the machining of other types of support structures in SLM.
Source Title: JOURNAL OF ALLOYS AND COMPOUNDS
URI: https://scholarbank.nus.edu.sg/handle/10635/191846
ISSN: 09258388
18734669
DOI: 10.1016/j.jallcom.2020.157133
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