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Open AccessArticle

Comparative Research on the Rebound Effect in Direct Electromagnetic Forming and Indirect Electromagnetic Forming with an Elastic Medium

1
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
Changzheng Machinery Factory, China Aerospace Science and Technology Corporation, Chengdu 610100, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1450; https://doi.org/10.3390/ma11081450
Received: 24 July 2018 / Revised: 12 August 2018 / Accepted: 14 August 2018 / Published: 16 August 2018
(This article belongs to the Section Manufacturing Processes and Systems)
In the process of electromagnetic forming (EMF), the rebound effect caused by high speed collision between sheet and die will affect the fittability, which results in a bad forming quality of workpiece. In this paper, finite element models of direct EMF and indirect EMF with an elastic medium are established, the influence factors of fittability in indirect EMF are studied, the two forming processes are compared, and the mechanisms of reduced rebound effect in indirect EMF are revealed. The results show that: in indirect EMF, with the increase of the discharging voltage or thickness of rubber, the fittability increases and then decreases; when the thickness of driver plate is equal to the skin depth of the driver plate, the fittability is the best. The optimal process parameters of indirect EMF are as follows: the discharging voltage is 10 kV, the thickness of the rubber is 20 mm and the thickness of driver plate is 2 mm. The rebound effect in indirect EMF is reduced compared with direct EMF for the following reasons: the impact force caused by the collision between the sheet and die is balanced by the pressure provided by the rubber; the sheet is always under tensile stress state due to the friction force provided by rubber; the remaining kinetic energy of sheet after collision with the die is absorbed by rubber. Therefore, the rebound effect in indirect EMF is suppressed compared with direct EMF. So, the fittability of the workpiece is improved, which results in a better forming quality. View Full-Text
Keywords: rebound effect; elastic medium; indirect electromagnetic forming; fittability rebound effect; elastic medium; indirect electromagnetic forming; fittability
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MDPI and ACS Style

Liu, X.; Huang, L.; Su, H.; Ma, F.; Li, J. Comparative Research on the Rebound Effect in Direct Electromagnetic Forming and Indirect Electromagnetic Forming with an Elastic Medium. Materials 2018, 11, 1450.

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