Transactions of Materials and Heat Treatment

Title：Influence of process parameters on stress，strain and thickness in friction thermal incremental forming for AZ31B magnesium alloy sheet

Authors： Hu Shiyao Zhou Liuru Jiang Xu Wang Jiahao

Unit： Nanchang University

KeyWords： friction thermal incremental forming AZ31B magnesium alloy Mises stress equivalent plastic strain thickness

ClassificationCode：TG381

year,vol(issue):pagenumber：2022,47(2):62-72

Abstract：

In order to explore the relationships between process parameters and stress, strain and thickness, AZ31B magnesium alloy sheet was processed by friction thermal incremental forming technology, and combined with finite element simulation technology, the relationships between the process parameters including drop amount (1.0, 1.5 and 2.0 mm), tool head diameter (Φ8, Φ10 and Φ16 mm) and Mises stress, equivalent plastic strain and thickness were analyzed. The results show that the maximum Mises stress increases with a certain proportion in the early loading process and fluctuates between 160-180 MPa in the middle and late forming processes, the drop amount and tool head diameter have no significant effect on the maximum Mises stress, and the Mises stress in the corner area is greater than that in the side wall area. The equivalent plastic strain increases with the increasing of drop amount, while the equivalent plastic strain decreases with the increasing of tool head diameter, and the equivalent plastic strain in the corner area is greater than that in the side wall area. There is a negative correlation between drop amount and thickness, while the tool head diameter increases, the thickness increases first and then decreases, and the thickness in the corner area is smaller than that in the side wall area. The equivalent plastic strain increases along the running direction of tool head, while the thickness decreases. Thus, according to the original unidirectional trajectory, a bi-directional trajectory is proposed, and the study also finds that the uniformity of equivalent plastic strain and thickness distribution is improved by this trajectory.

Funds：

国家自然科学基金资助项目(51465038)；南昌大学2019年科研训练项目

作者简介：胡诗尧（1995-），男，硕士,E-mail：1069154665@qq.com;通信作者：周六如（1963-）男，博士，副教授,E-mail：zlrhust@163.com

Reference：

[1]Zhan X P, Wang Z H, Li M, et al. Investigations on failure-to-fracture mechanism and prediction of forming limit for aluminum alloy incremental forming process[J]. Journal of Materials Processing Technology, 2020, 282(4):116687.

[2]Barnwal V K, Chakrabarty S, Tewari A, et al. Forming behavior and microstructural evolution during single point incremental forming process of AA-6061 aluminum alloy sheet[J]. International Journal of Advanced Manufacturing Technology, 2018,95(1):921-935.

[3]Gaira S, Theja V S, Karthikeyan G. Simulation and experimentation of single point incremental forming of different geometries[J]. Journal of Physics Conference Series, 2019, 1240:12007.

[4]Wang Z H, Cai S, Chen J. Experimental investigations on friction stir assisted single point incremental forming of low-ductility aluminum alloy sheet for higher formability with reasonable surface quality[J]. Journal of Materials Processing Technology, 2020, 277:116488.

[5]Ceretti E, Giardini C, Attanasio A. Experimental and simulative results in sheet incremental forming on CNC machines[J]. Journal of Materials Processing Technology, 2004, 152(2):176-184.

[6]Shrivastava P, Tandon P. Microstructure and texture based analysis of forming behavior and deformation mechanism of AA1050 sheet during single point incremental forming[J]. Journal of Materials Processing Technology, 2019, 266:292-310.

[7]Grimm T J, Mears L. Investigation of a radial toolpath in single point incremental forming[J]. Procedia Manufacturing, 2020，48:215-222.

[8]Mohammadi A, Vanhove H, Bael A V, et al. Towards accuracy improvement in single point incremental forming of shallow parts formed under laser assisted conditions[J]. International Journal of Material Forming, 2016, 9(3): 339-351.

[9]Xu D K, Lu B, Cao T T, et al. Enhancement of process capabilities in electrically-assisted double sided incremental forming[J]. Materials & Design, 2016, 92: 268-280.

[10]Al-Obaidi A, Krusel V, Landgrebe D. Hot single-point incremental forming assisted by induction heating[J]. The International Journal of Advanced Manufacturing Technology, 2016, 82(5-8): 1163-1171.

[11]Kumar A, Gulati V, Kumar P, et al. Parametric effects on formability of AA2024-O aluminum alloy sheets in single point incremental forming[J]. Journal of Materials Research and Technology, 2018,8(1):1461-1469.

[12]Ambrogio G, Gagliardi F. Temperature variation during high speed incremental forming on different lightweight alloys[J]. The International Journal of Advanced Manufacturing Technology, 2015, 76(9-12): 1819-1825.

[13]Ambrogio G, Letícia de Souza Castro Filice, Manco G L. Warm incremental forming of magnesium alloy AZ31[J]. CIRP Annals-Manufacturing Technology, 2008, 57(1): 257-260.

[14]Cédric B, Pierrick M, Sébastien T. Shape accuracy improvementobtained by μ-SPIF by tool path compensation[J]. Procedia Manufacturing, 2020, 47:1399-1402.

[15]Ji Y H, Park J J. Formability of magnesium AZ31 sheet in the incremental forming at warm temperature[J]. Journal of Materials Processing Technology，2008, 201(1-3):354-358.

[16]Galdos L, Eneko Sáenz de Argandoa, Ibai Ulacia, et al. Warm incremental forming of magnesium alloys using hot fluid as heating media[J]. Key Engineering Materials，2012, 504-506:815-820.

[17]Yi S B, Davies C H J, Brokmeier H G, et al. Deformation and texture evolution in AZ31 magnesium alloy during uniaxial loading[J]. Acta Materialia, 2006, 54(2): 549-562.

[18]王海.镁合金板料工具转动渐进成形研究[D].青岛:青岛理工大学，2014.

Wang H.Research on Tool Rotational Incremental Forming of Magnesium Alloy Sheet[D].Qingdao: Qingdao University of technology, 2014.

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