Electro-magnetic
pulse (EMP) technologies use magnetic fields to move conductive material
in extremely short time steps, typically < 1 second. Material can be
formed into complex shapes or produce joints high in strength and integrity
when suitable operating conditions are chosen.
Companies
using electro-magnetic pulse technologies benefit from fast cycle times,
enhanced plastic flow, formation of complex shapes, production of solid-state
bonds, and the ability to join dissimilar materials. EMP technologies
have been adapted for use with a variety of component sizes ranging
from 10 inches to fractions of an inch. The technology is ideally suited
for application with cylindrical components although extensive developments
are underway for use with more complex shapes.
Electro-magnetic
pulse technology operates by dumping stored energy from a capacitor
bank into a coil that transforms electrical energy into magnetic energy
due to the rapid change in current over a short period of time. The
magnetic field creates eddy currents in the part that opposes the magnetic
field, creating a repulsive force. This causes movement of the material
at a high rate, forcing it to adopt the shape of whatever surface it
meets. Under highly specific conditions, solid-state welds
between similar and dissimilar materials can be produced.
Traditional
applications include manufacturing and assembly operations for the aerospace
and automotive industries, producing electrical and pressure connections,
torque tubes and space frame sections. Recent developments have demonstrated
the application of EMP technology to sheet metal forming, tubular space
frames, and drive shafts.
