Numerical study on electrohydraulic forming process to reduce the bouncing effect in electromagnetic forming

作者：Woo Min A; Noh Hak Gon; An Woo Jin; Song Woo Jin; Kang Beom Soo; Kim Jeong^*

来源：International Journal of Advanced Manufacturing Technology, 2017, 89(5-8): 1813-1825.

DOI：10.1007/s00170-016-9230-z

• Electromagnetic forming
• Bouncing effect
• Electrohydraulic forming
• Arbitrary Lagrange-Eulerian multimaterial
• Fluid-structure interaction

Electromagnetic forming (EMF) is a high-speed forming process that forms a blank by using Lorentz force. Because it is a high-speed process, the effects of high strain rate can enhance the formability of the blank. However, when the blank is deformed into a complex shape, bouncing occurs at the surface of the blank, thereby generating wrinkles in the metal. Therefore, electrohydraulic forming (EHF) is proposed in this paper to overcome the bouncing effect. EHF is a high-speed forming process that employs high voltage discharge in water. The shockwave resulting from the electric discharge propagates to the blank through the water and deforms the blank into the shape of the die. A numerical simulation of the EHF process was performed using the LS-DYNA program to examine the forming procedure in detail. In the simulation, an arbitrary Lagrange-Eulerian multimaterial formulation was used to describe the interaction between the fluid components. Furthermore, a coupling mechanism was used for modeling the fluid-structure interaction. The numerical results of EHF were compared to those of EMF. This comparison showed that the EHF process can overcome the bouncing effect and deform a blank into a complex shape.

• 出版日期2017-3