Punch r r = R0/( 1+ax R0/t)
R0=80
R0/t=80/6= 13.3333
The so-called simplification coefficient = the yield strength/elastic modulus of 3x materials.
I don't know. Your material A is a simplification factor.
It is calculated according to the simplified coefficient (0.05) of 20 # and A3 # steel.
R convex = 80/(1+0.05x13.333) = 48.
Calculation of complex angle =( 180 degrees-107 degrees) X(80/48- 1)=48.6.
The drilling angle is: 107-48.6=58.4.
There may be errors due to unknown material properties.
2. Bouncing and punching are wrong.
3. The radian of the female die should be the radian of the male die plus the thickness of the material.