MANUFACTURING – HEET METAL & FORMING CALCULATOR
Stamping Press Tonnage
A precise tool.
What is the Stamping Press Tonnage & How does it work?
Stamping presses must generate enough force to shear the sheet metal. The shear stress is approximated as 60 % of the material’s ultimate tensile strength (UTS), giving a value in megapascal (MPa) that can be directly multiplied by an area in square‑millimetres to obtain a force in newtons.
The shear area for a straight cut is simply the product of the material thickness (t) and the shear length (L). By inserting realistic dimensions, the required force scales linearly with both thickness and length, allowing quick estimation of press capacity.
Design practice adds a safety factor (SF) to accommodate material variability and tool wear. The resulting force is then converted from newtons to metric tons (1 ton ≈ 9.80665 kN) to match the rating conventions of stamping presses.
T = frac{0.6 cdot text{UTS} cdot t cdot L}{9.80665 times 10^{3}} times text{SF}
T = required press tonnage (tons)
Parameters
Result
—
Frequently Asked Questions
What is the formula used in the stamping press tonnage calculator?
The formula calculates force as 60% of the material’s ultimate tensile strength multiplied by the shear area, which is the product of thickness and shear length.
How does changing the material thickness affect the required tonnage?
Increasing the material thickness directly increases the required tonnage linearly.
What is the significance of 60% in the calculator’s formula?
60% represents the approximate shear stress, which is used to estimate the force needed to cut the sheet metal.
Can I use this calculator for different materials?
Yes, as long as you know the ultimate tensile strength of the material, you can input it into the calculator.
How do I convert the calculated force from newtons to tons?
To convert newtons to tons, divide the force in newtons by 9807 (since 1 ton = 9807 newtons).
What is the role of shear length in this calculation?
Shear length is one dimension of the shear area; increasing it will also increase the required force linearly.
Is there a maximum tonnage limit for stamping presses?
Yes, the maximum tonnage depends on the specific press model and its design capacity.
Results are for informational purposes only and do not constitute professional advice.