Shearing-type operations include blanking, piercing, roll slitting, and trimming.
This causes the material to experience highly localized shear stresses between the punch and die.
Two distinct sections can be seen on a sheared workpiece, the first part being plastic deformation and the second being fractured.
Because of normal inhomogeneities in materials and inconsistencies in clearance between the punch and die, the shearing action does not occur in a uniform manner.
The rough edge can be reduced if the workpiece is clamped from the top with a die cushion.