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Calculation of punching force
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Please find below the formula to calculate punching forces.
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F = punch force in Kilonewton
(10 kN = 1 metric ton)
U = circumference or perimeter of the punch shape (in mm)
s = Sheet thickness (in mm)
Rm = tensile strength (in N/mm²)
for Stainless Steel (1.4301) 720 N/mm²
for Mild Steel (St 37) 420 N/mm²
for Aluminium (AlMg3) 220 N/mm²
f = factor between 0,5 - 0,95 when using punches with shear.
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Note:
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Metric units are shown above, however a modified formula can be used for other units of measure (such as inch); keep in mind that all the units of measure must be the same
throughout the formulas (all in inches, all metric, etc.)
Punching Force =
punch perimeter x material thickness x material shear strength x f (shear factor)
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- punch force (tons)
- punch perimeter (inches)
- material thickness (inches)
- material shear strength (tons per square inch)
Typical material shear strengths (tons/in²):
- Stainless steel = 50 tons/in²
- Mild Steel = 25 tons/in²
- Aluminium = 15 tons/in²
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If you have any further questions please do not hesitate to
contact our sales engineers.
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