Forming, shearing and welding metal through impulse metalworking has significant advantages over conventional processes. Short time scales change the fundamental nature of the forming process and short duration impulses can enable a transition toward lighter and more agile equipment and away from heavy presses. Increased forming limits, reduced springback, low cost tooling, and reduced wrinkling are among the many documented advantages of impact forming. Shearing at high speeds has been shown to reduce sliver formation and provide increased dimensional tolerance. There is also a critical velocity above which shearing requires much less energy because of localized deformation along narrow adiabatic shear bands. Collision welding driven by an impuse is a solid state process that enables the joining of dissimilar metals with no heat affectes zones and weld regions that outperfrom the parent material. The group uses electromagnetic forces, vaporizing foil actuators and dielectrics, and pulsed laser as tools for developing short-duration, high-magnitude impulses.
History of Impulse Metalworking
There is a fairly rich history in this area, however a true engineering science never developed in the interdisciplinary area of impact metal forming, and most of the papers written were rather anecdotal. We have an archive of much of this old literature, available to our partner organizations.