Numerical simulation for the multi-point stretch forming process of sheet metal |
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Authors: | Zhong-Yi Cai Shao-Hui Wang Xu-Dong Xu Ming-Zhe Li |
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Affiliation: | 1. Roll Forging Research Institute, Jilin University (Nanling Campus), 5988 Renmin Street, Changchun, 130025, PR China;2. Chengdu Aircraft Industrial (Group) Co. Ltd., Huangtianba, Chengdu 610092, PR China;1. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran;2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran;3. Center of Excellence for High Strength Alloy Technology, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran |
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Abstract: | Multi-point stretch forming (MPSF) is a flexible manufacturing technique to form large sheet panels of mild curvature. The traditional fixed shape-stretching die is replaced by a matrix of punch elements, and the sheet metal are stretch-formed over the multi-point stretching die (MPSD) generated by the punch element matrix. In this paper, extensive numerical simulations of the processes for stretching parabolic cylinder, toroidal saddle and sphere parts were carried out by dynamic explicit finite element analysis. The forming results using multi-point die were compared with those of using traditional die. The use of an elastic cushion to suppress dimpling of the part caused by the discrete punch elements was investigated along with a discussion of its influence on part shape accuracy. The effect of the size of punch element and the shape of MPSD on the shape accuracy of formed parts were analyzed. The results may provide useful guidance on determining MPSF parameters and optimizing MPSF manufacture processes. |
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