Transactions of Materials and Heat Treatment

Title：Hydroforming technology for large aluminum alloy panel of automobile

Authors： Lang Lihui Sun Zhiying Wang Yao

Unit： Beihang University

KeyWords： aluminum alloy covering parts hydroforming engine hood outer panel wrinkle crack

ClassificationCode：TG394

year,vol(issue):pagenumber：2017,42(8):22-28

Abstract：

The lightweight of automobile is the key of the application of aluminum alloy panel, but it is difficult to manufacture. The advanced flexible technology is feasible in the application of automotive field by researching the hydroforming process of the aluminum alloy engine hood outer panel. Then, the influences of matching chamber pressure with punch stroke and the blank holder force in the technological parameters on the thinning rate of sheet metal were analyzed, and the scope of the part without wrinkling and rupture was determined by the forming limit diagram (FLD). Furthermore, the optimal shaping chamber pressure is obtained within 12-20 MPa. However, when the blank holder force is too small, the plastic deformation of sheet metal can not be realized completely; while the blank holder force is too large, the rupture is easily occurred. Thus, the optimal constant blank holder force is within 1600-2000 kN. The results show that the noise is reduced in the factory by the sheet hydroforming of flexible manufacturing process, and there is no impact line. Finally, the slip line is reduced because of chamber pressure, and the quality of large aluminum alloy plate with weak rigidity is improved.

Funds：

国家科技重大专项（2014ZX04002041）

郎利辉（1970-），男，博士，教授孙志莹（1984-），女，博士研究生

Reference：

［1］Lang L H, Wang Y M, Xie Y S, et al. Pre-bulging effect during sheet hydroforming process of aluminum alloy box with unequal height and flat bottom [J]. Transactions of Nonferrous Metals Society of China，2012, 22: 302-308.
［2］郎利辉，孙志莹，孔德帅，等. 复杂薄壁航空整体钣金件的液压成形技术[J]. 锻压技术，2014, 39(10): 25-31, 42.Lang L H，Sun Z Y，Kong D S, et al. Hydroforming technology on whole complex thin-walled sheet in aviation industry [J]. Forging & Stamping Technology，2014, 39(10): 25-31, 42.
［3］Xu Y C, Chen Y, Yuan S J. Influences of loading paths on thickness of aluminium alloy cup with hydro-mechanical deep drawing[J]. International Journal of Materials & Product Technology，2010, 38(2-3): 173-183.
［4］Zhang Q D, Lang L H, Wang Y, et al. Theoretical investigation on the springback behavior of AA7B04 sheet in hydraulic bulge process [J]. International Journal of Advanced Manufacturing Technology，2016, 87(9-12): 2861-2871.
［5］褚勇，李全伟，祝林. 汽车轻量化用铝合金板冲压成形性研究[J]. 模具技术，2014，(5): 9-12.Chu Y, Li Q W, Zhu L. Research on formability of aluminum alloy sheet for lightweight of automobile[J]. Die and Mould Technology，2014，(5): 9-12.
［6］吕祝星, 宋燕利，兰箭. 基于特征的汽车覆盖件冲压工艺优选机制[J]. 塑性工程学报, 2016,23(3): 45-51.Lyu Z X, Song Y L，Lan J. Feature-based optimization mechanism of stamping process for automobile panels [J]. Journal of Plasticity Engineering, 2016,23(3): 45-51.
［7］Yuan S J, Han C, Wang X S. Hydroforming of automotive structural components with rectangular-sections[J]. International Journal of Machine Tools and Manufacture, 2006, 46(11): 1201-1206.
［8］Choi S, Lee M, Kang C. Effect of process parameters and laminating methods on spring-back in V-bending of CFRP/CR340 hybrid composites[J]. International Journal of Precision Engineering and Manufacturing, 2016, 17(3): 395-400.
［9］Sun S, Daxin E. The investigation of time-dependent springback for AC170PX aluminum alloy at room temperature[J]. Materials & Design, 2016, 93: 118-127.
［10］严勇，吴超，胡志力，等. 汽车铝合金覆盖件成形数值模拟的各向异性屈服准则研究[J]. 塑性工程学报, 2016, 23 (2):92-97.Yan Y, Wu C, Hu Z L, et al. Anisotropic yield criterion for automotive aluminum panels forming numerical simulation[J]. Journal of Plasticity Engineering, 2016, 23 (2) :92-97.
［11］GB/T 228.1—2010，金属材料拉伸试验第1部分：室温试验方法[S].GB/T 228.1—2010, Metallic materials—Tensile testing—Part 1: Method of test at room temperature [S].
［12］张钧萍，金庆生，马鸣图. 6016铝合金热处理工艺研究[J]. 中国工程科学, 2014, 16 (1) :103-107.Zhang J P, Jin Q S, Ma M T. Research on heat treatment process of 6016 aluminum alloy[J]. Engineering Sciences, 2014, 16 (1) :103-107.
［13］Meng B, Wan M, Wu X, et al. Inner wrinkling control in hydrodynamic deep drawing of an irregular surface part using drawbeads[J]. Chinese Journal of Aeronautics, 2014, 27(3): 697-707.
［14］Hashemi R, Madoliat R, Afshar A. Prediction of forming limit diagrams using the modified M-K method in hydroforming of aluminum tubes [J]. International Journal of Material Forming, 2016, 9(3): 297-303.
［15］Green D E, Angara T S, Nurcheshmeh M, et al. A practical method to evaluate the forming severity of tubular hydroformed parts[J]. International Journal of Advanced Manufacturing Technology, 2012, 62(9-12): 965-980.
［16］Cai G, Zhou X, Lang L H, et al. Research on aluminum alloy sheet thermoplastic deformation behavior based upon warm bulging test[J]. AIP Advances, 2016, 6 (2) :1136-1146.
［17］Cai G, Lang L H, Liu K, et al. Research on the effect of flow stress calculation on aluminum alloy sheet deformation behavior based on warm bulging test[J]. Metals and Materials International, 2015, 21(2): 365-373.
［18］郎利辉，袁超，王永铭，等. 6061铝合金飞行器翼尖蒙皮充液成形及起皱控制研究[J]. 锻压技术，2014，39(9): 36-41.Lang L H，Yuan C，Wang Y M, et al. Research on hydroforming and wrinkle control for wing tip skin of 6061 aluminum alloy[J]. Forging & Stamping Technology, 2014,39(9): 36-41.

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