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Home > Metal Fabricating Tips & Facts > Metal Stamping Formulas

Metal stamping formulas

Metal Stamping Factor Formula
Inch Tons Blanking BE = T x Mt x 0.5
Inch Tons Drawing DE = T x Dl x 0.63
Stripping Tonnage P = 1.7 x L x Mt
Blanking Formula T = L x Mt x Ss/2000
Blanking Diameter for Drawing BD = square root of √ d+ (4 x d x h)
Minimum Draw Diameter MD = BD * 0.6
Press Slide Velocity V = 0.5233 x SPM x √ (Ps x Ws) - Ws
Inch Tons Energy Capacity ITC = T x PRP
Blank Holder Pressure BHP = 0.20 x T
Tonnage Round Hole T = 3.14 x d x Mt x Ms

Formula abbreviations

BD = Blank Diameter
BE = Blanking Energy (Inch Tons)
BHP = Blank Holder Pressure
d = diameter
DE = Draw Energy (Inch Tons)
Dl = Draw length
h = height
ITC = Inch Tons Capacity
L = Length of Cut
MD = Minimum Diameter
Mt = Material Thickness
PRP = Press Stroke Length
Ps = Press Stroke Length
SPM = Strokes Per Minute
Ss = Material Shear Strength
St = Stripping Tonnage
T = Tonnage
V = Press Slide Velocity
Ws = Work Stroke Length

The reference for this table is from:

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Advantage Fabricated Metals
a division of Corrugated Metals, Inc.
We invest in our customers.™
3575 Morreim Drive • Belvidere, Illinois 61008
Phone: 1-815-323-1310 • Fax: 1-815-323-1317