P=L x T x S / 2000
P = Tons   L = Cut Length
T= Material Thickness   S = Material Shear Strength

• Note:  No shear on die, add 25%;  Partial shear use full tonnage, Full shear on die, reduce by 20% to 25%

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Energy Estimation Formula

BE = T x Mt x 0.5
BE = Blanking Energy (Inch Tons)    T = Tonnage    Mt = Material Thickness

DE = T x Dl x 0.63
DE = Draw Energy (Inch Tons)   T =  Tonnage Dl = Draw Length

Stripping Formula:   P = 1.7 x L x T
P = Stripping Tonnage   L = Length of Cut T = Material Thickness

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Hydraulic Press Speed

• The SPM is determined by calculating time for each phase of the ram stroke:  Rapid advance, pressing, dwell (if any), and rapid return stroke.

T = D x 60 / IPM
T = Time in Seconds    D= Distance of ram travel in inches
IPM = Ram speed in Inches Per Minute

Note:  Add 0.50 seconds for valve shift to total time per stroke.  Then divide the total time into 60 seconds for strokes per minute:  60 / Total time = Strokes Per Minute.

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Convenient Information

 

1 inch  = 25.4 mm	1 mm =0.03937 inches
1 pound = 0.4536 kilograms	1 kilogram = 2.2046 pounds
Circumference = Dia. x 3.1416

Approximate weight in pounds per cubic inch:
Steel = 0.284        Cast Iron =0.259

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Material Thickness Gage Thickness 8 0.164 " 10 0.135" 12 0.105" 14 0.075" 16 0.060" 18 0.048" 20 0.036" 22 0.030"

Coil weight per inch width of steel at various OD/ID sizes OD / ID Lbs / Inch 48" / 16"  440 48" / 20" 410 60" / 16"  720 60" / 20"  690 60" / 24" 650 72" / 24"  990

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