A. Forces and stressesThe cutting f

A. Forces and stresses
The cutting force do not act linearly along the cutting edge instead, the vertical force Fv and horizontal force FH act in small area near the cutting edge as shown in fig 3 The distribution of those compressive forces are non uniform. The distance, l, between the forces FH and FV’ cause bending movement must be compensated for by counter bending moment that is created by bending stresses and horizontal normal stresses between work piece and tool fig also shows the resulting frictional forces μ.FH and μ. FV these frictional forces increases total blanking forces.
The blanking process can be investigated by monitoring the change in the blanking force during the cutting process the force varies with the punch displacement , punch entry time or crank angle.