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Abstract：
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When punch is carried out on the sloping wall of the thin-walled tube, it is difficult to make the axis of punched hole completely perpendicular to the inclined wall, and the surface of part and the punching section are of poor quality. The necking-punching compound electromagnetic forming (EMF) on aluminum alloy tube was studied by experiments, and the forming quality and punching fracture were observed and evaluated. The result shows that the necking-punching compound electromagnetic forming (EMF) process is realized under the compound effect of the inertia from high rate of deformation and die, and the necking deformation under high rate plays decisive role on the punching. Therefore, the tube end necking is realized under the voltage of 9 kV by EMF, and the punching is conducted entirely under the voltage of 15.5 kV. Furthermore, the discharge voltage for tube end necking is obviously lower than that of necking-punching, and the closer to the outer end of the necking zone is, the higher discharge voltage is for the hole punching. Compared with the quasi static tube end necking with steel die and the punching with soft die, the surface quality of necking-punching part through EMF is higher, the fillet region is 40% of initial thickness of the tube wall, the height of burr is about 0.05 mm, and the cross section is almost perpendicular to the busbar of necking zone. The boundary between bright zone and the fracture zone is regular, and the dimple is denser in the fracture zone.
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Funds：
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国家自然科学基金资助项目(51475122，51675128)
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AuthorIntro：
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作者简介：陈文韬（1997-），男，本科
E-mail：cwt970228@163.com
通讯作者：于海平（1974-），男，博士，副教授，博士生导师
E-mail：haipingy@hit.edu.cn
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Reference：
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