Deep-drawing calculations

Deep-drawing calculations can be complex. The press, dies, material, radius, and part shape all have bearing. For drawing round shells, the following formula is a simple guide:
C x T x Ts = tons
Where:

C = circumference of the finished part; T = material thickness in inches; and
Ts = tensile strength of the material.



Example: To draw a 5" diameter cup of .040" stock with a tensile strength of 46,000 psi would require the following tonnage:
(5 x 3.1416) x .040 x (46000/2000) = 14.44 tons
A 20-ton press would be recommended