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Investigation of material deformation mechanism in double side incremental sheet forming

Lu, B.; Fang, Y.; Xu, D.K.; Chen, J.; Ai, S.; Long, H.; Ou, H.; Cao, J.

Authors

B. Lu binlu@sjtu.edu.cn

Y. Fang

D.K. Xu

J. Chen jun_chen@sjtu.edu.cn

S. Ai

H. Long h.long@sheffield.ac.uk

J. Cao



Abstract

Double side incremental forming (DSIF) is an emerging technology in incremental sheet forming (ISF) in recent years. By employing two forming tools at each side of the sheet, the DSIF process can provide additional process flexibility, comparing to the conventional single point incremental forming (SPIF) process, therefore to produce complex geometries without the need of using a backing plate or supporting die. Although this process has been proposed for years, there is only limited research on this process and there are still many unanswered open questions about this process. Using a newly developed ISF machine, the DSIF process is investigated in this work. Focusing on the fundamental aspects of material deformation and fracture mechanism, this paper aims to improve the understanding of the DSIF process. Two key process parameters considered in this study include the supporting force and relative position between master and slave tools. The material deformation, the final thickness distribution as well as the formability under varying conditions of these two process variables are investigated. An analytical model was developed to evaluate the stress state in the deformation zone. Using the developed model, an explicit relationship between the stress state and key process parameters was established and a drop of stress triaxiality was observed in the double contact zone, which explains the enhanced formability in the DSIF process. Based on the analytical and experimental investigation, the advancements and challenges of the DSIF process are discussed with a few conclusions drawn for future research.

Journal Article Type Article
Publication Date Jun 30, 2015
Journal International Journal of Machine Tools & Manufacture
Electronic ISSN 0890-6955
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 93
APA6 Citation Lu, B., Fang, Y., Xu, D., Chen, J., Ai, S., Long, H., …Cao, J. (2015). Investigation of material deformation mechanism in double side incremental sheet forming. International Journal of Machine Tools and Manufacture, 93, https://doi.org/10.1016/j.ijmachtools.2015.03.007
DOI https://doi.org/10.1016/j.ijmachtools.2015.03.007
Keywords Double-sided incremental sheet forming, Deformation behaviour, Formability, Fracture
Publisher URL http://www.sciencedirect.com/science/article/pii/S0890695515300213
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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