Electromagnetic compression was integrated into the process chain of hot metal extrusion
in order to reduce the cross section of the workpiece locally. To integrate both processes,
a tool coil for electro-magnetic compression is positioned behind the die exit and coaxially
to the extrudate. Additionally, a counter die in the shape of a mandrel can be mounted to
the mandrel of a porthole extrusion die, which extends into the working area of the tool
coil. Experiments were conducted on hollow profiles which were compressed by
electromagnetic forming subsequent to extrusion. Due to an extremely short processing
time of the high speed forming process, a compensation of the relative speed between the
workpiece and the tooling can be ignored. For determine the workpiece displacement
during the electromagnetic forming process, a new measuring strategy based on the
Photon Doppler Velocimetry was developed
