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Shearing

Shearing

A perfect sheared edge is characterized by low burr height, small rupture zone, low amount of roll over, low penetration depth, and a large shear zone. Increased punch velocity leads to improved quality of sheared edges and a reduction in penetration depth and rollover (Breiting, 1998).
Golowin (2008) implemented punchless electromagnetic shearing by using path actuators to drive metal sheets into single-sided shearing dies. That work showed that at high speeds during direct electromagnetic shearing, even thermally conductive materials show improved sheared edge quality as compared to quasistatic shearing.
Another advantage that high speed shearing offers is the reduction in force on the shearing die. If the shear stress wave velocity is less than the shearing velocity, all the deformation is concentrated on the cutting edge, and the energy required for shearing is lowered. 

Electromagnetic ShearingExample of Electromagnetic ShearingExample of the reduced burr height due to impulse formingExample of the reduced burr height due to impulse forming