Suggest and Design a progressive die to make a blank with a 2 mm thick steel sheet as shown in Fig. The ultimate shear strength of the material is 480 MPa. Calculate press capacity assuming 75% efficiency.
Like I know if we have to design a progressive die washer then we calculate shear force as= shear stress x Area to be sheared. area to be sheared in washer= 3.14 x (D+d) x t where D is outer diameter and d is inner diameter and t is thickness. And then press capacity is calculated as F/0.75 as 75% is efficiency
and if we need to design die a punch for a single blanking operation we calculate fore as = 3.14 x D x t x shear strength.
But I'm not able to tackle this problem as it is not similar two either of the case I described above, how do we tackle such problems, kindly looking for help. Thank you