A blanking operation is to be performed on 2 mm thick cold rolled steel. The part is circular with diameter = 75 mm. Determine: 

a) the appropriate punch and die sizes for this operation if the allowance for the cold rolled steel is a = 0.075. 

b) the blanking force required if the steel has a shear strength = 325 MPa and the tensile strength is 450 MPa

Punch Sheet stock D,= punch size Die D = die size Blanked piece