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| Influence of Predeformation and Electromagnetic Forming on Springback of Aluminum Alloy Curved Parts |
| DU Zhihao1, YANG Huan2, CUI Xiaohui1,2,3, WANG Shipeng2, YANG Guang2 |
1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2. Light Alloy Research Institute, Central South University, Changsha 410083, China
3. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China |
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Abstract In this paper, aluminum alloy single curvature skin is taken as the research object, and the problem of large springback of sheet metal is solved by using the method of combination of tensile and electromagnetic progressive forming. The effects of two predeformation schemes of fixed clearance and variable blank holder on the deformation and springback of sheet metal were studied by finite element method and experiment. Compared with the fixed gap stamping, the springback of the sheet is greatly reduced, and the springback is 47.6 mm. Then the electromagnetic progressive method of skin parts with elastic pad is used to reduce the springback of sheet metal. It is found by simulation that the tangential tensile stress of the sheet decreases and a small plastic strain is produced. The plastic strain energy increases, the elastic strain energy decreases, and the springback decreases. When the coil discharges 8 kV in 6 positions, the springback of the sheet is 10.4 mm, which is 78.1% lower than that of the quasi-static stamping, and the surface of the parts is smooth. The experimental results are consistent with the simulation. The research in this paper provides a reliable means for the accurate manufacture of aluminum alloy skin parts.
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2022, 
