Abstract
High-velocity electromagnetic sheet-metal forming and processing has many potential advantages over more conventional techniques, including: higher-forming limits, resistance to wrinkling and springback, one-sided tooling, and physical contact to only one side of the work piece. Traditional electromagnetic actuators are flat spirals that produce a nonuniform pressure distribution, limiting the types of parts that can be formed. A new type of electromagnetic actuator, the uniform pressure (UP) actuator, has been developed. The UP actuator can uniformly and efficiently accelerate conductive sheet metal to velocities on the order of 200 m/s or greater over distances of a few millimeters. When the material is arrested by impact with a tool, high-forming pressures can be imparted to it. The utility of the UP actuator is illustrated here by demonstrating its ability to form sheet metal components with intricate shape, to shock harden, and also to pick up nearly arbitrarily small details from a die surface. Thus, electromagnetic processing with the use of the UP actuator offers the unprecedented ability to simultaneously form and engineer the surface morphology and microstructure of sheet metal samples.
Similar content being viewed by others
References
G.S. Daehn, High Velocity Metal Forming, in ASM Handbook, Volume 14B, Metalworking: Sheet Forming, Published 2006, ASM International, p 405–418
G.S. Daehn, Electromagnetically Assisted Stamping – A Vision of a Future for Metal Forming, www.osu.edu/hyperplasticity, April, 2005
Seth M., Vohnout V.J., Daehn G.S. 2005 Formability of Steel Sheet in High Velocity Impact. J. Mater. Process. Technol. 168:390–400
J.D. Thomas, M. Seth, G.S. Daehn, J.R. Bradley, and N. Triantafyllidis, Forming Limits for Electromagnetically Expanded Aluminum Alloy Tubes: Theory and Experiment, Acta Mater., 2007, 55, p 2863–2873
M. Kamal, A Uniform Pressure Electromagnetic Actuator for Flat Sheet Forming, Ph.D. Dissertation, The Ohio State University, 2005
“Electromagnetic Formation of Fuel Cell Plates,” United States Patent #7,076,981, 18 July 2006
“Electromagnetic Metal Forming,” United States Patent #7,069,756, 4 July 2006
Johnson W. 1970 Impact Strength of Materials. London: Edward Arnold
A.H. Clauer, Applications of Laser-Induced Stress Waves, presented at ASM Conf. on Laser Solid Interactions, 1979, Washington, DC
A.H. Clauer, J.H. Holbrook, and B.P. Fairland, Effects of Laser Induced Shock Waves on Metals, in Shock Wave and High Strain Rate Effects in Metals, M.A. Myers and L.E. Murr Ed.,. Plenum, 1981, p 675–702
P.S. Follansbee and U.F. Kocks, Acta Metall., 1988, 36, p 81–93
L. Prandtl, Über die Hä rte Plastischer Kö rper. Nachr. Akad. Wiss. Göttingen. Math-Physik. Kl., 1920
Ike H., Plancak M. 1998 Coining Process as a Means of Controlling Surface Microgeometry. J. Mater. Process. Technol. 80-1:101–107
www.magneform.com, April, 2005
Acknowledgments
This work was supported, in part, by a grant from General Motors to The Ohio State University.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Golowin, S., Kamal, M., Shang, J. et al. Application of a Uniform Pressure Actuator for Electromagnetic Processing of Sheet Metal. J. of Materi Eng and Perform 16, 455–460 (2007). https://doi.org/10.1007/s11665-007-9085-4
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11665-007-9085-4