Posted: Jul 11, 2019
The Tonnage Formula is the pressure required in tons to cut a blank or contour using a flat faced punch with no shear. Tonnages can be calculated for forming, bending, cutting, drawing, and blanking operations. Having the ability to calculate the tonnages for a sheet metal project is vital for the completion and success of your project.
T = P x Th x C
T = Pressure required in tons
P = Perimeter of blank in inches
Th = Thickness of material
C = Constant (see common ones below)
Constant = The material shear strength/2000 pounds
.050 CR Steel, 1/2 Hd; Cutting edge of 12 linear inches T
= 12 x .050 x 32
T = 20 tons required
Steel– HR/Cold Rolled-27
Stainless Steel– Annealed-37
4130 AQ – 40
Brass– 1/2 Hard-22
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