锻压技术

AZ31B镁合金板料摩擦热渐进成形中工艺参数对应力、应变、厚度的影响

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

作者：胡诗尧周六如姜旭王嘉豪

单位：南昌大学

关键词：摩擦热渐进成形 AZ31B镁合金 Mises应力等效塑性应变厚度

分类号：TG381

出版年,卷(期):页码：2022,47(2):62-72

摘要：

为了探究工艺参数和应力、应变以及厚度之间的关系，利用摩擦热渐进成形技术加工AZ31B镁合金板料，并结合有限元技术分析工艺参数包括下降量（1.0、1.5和2.0 mm）和工具头直径（Φ8、Φ10和Φ16 mm）与Mises应力、等效塑性应变和厚度的关系。结果表明：最大Mises应力在前期加载过程中以一定比例递增、中后期成形过程在160~180 MPa之间波动，下降量和工具头直径对最大Mises应力不会产生显著影响，并且转角区域的Mises应力要大于侧壁区域；等效塑性应变随下降量的增加而增加，而随着工具头直径的增加，等效塑性应变呈现递减趋势，并且转角区域的等效塑性应变大于侧壁区域；下降量和厚度呈现负相关，而随着工具头直径的增加，厚度呈现先递增再递减的趋势，并且转角区域的厚度小于侧壁区域；沿着工具头运行方向，等效塑性应变呈现递增趋势、厚度呈现递减趋势。为此，针对原有的单向运行轨迹，提出双向运行轨迹，研究还发现，其使等效塑性应变和厚度分布的均匀性得到了提高。

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.

基金项目：

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

参考文献：

[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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