Press-Brake Air-Bend Tonnage
Air-bend press-brake tonnage from thickness, bend length, V-die opening, and tensile strength.
Example
You enter
- Material thickness T (in) 0.125
- Bend length (ft) 4
- V-die opening (in, ~8 x T) 1
- Ultimate tensile strength (ksi) 60
You get
- Tonnage per foot 8.9844 tons/ft
- Total tonnage 35.938 tons
Details, formula, and sources
Tons/ft = 575 x (UTS/60) x T^2 / V (the published mild-steel 575 constant), with the 8 x T die and minimum-flange advisories (empirical air-bend rule).
Air-bend tons/ft = 575 x (UTS/60) x T^2 / V; total = tons/ft x bend length. Recommended die ~8 x T; minimum flange ~0.7 x die opening.
Press-brake air-bend tonnage formula (the 575 mild-steel constant) as published in press-brake tonnage charts / Machinery's Handbook, by name; empirical method.
Empirical air-bend rule, cited; the user supplies the geometry and may override the strength. Bottoming and coining run substantially higher.
Estimate. AHJ and licensed professional govern.
Field names used by the API: thickness_in, bend_length_ft, die_opening_in, uts_ksi, tons_per_ft, total_tons
- Air bending the 575 rule is the air-bend form; bottoming and coining run several times higherpress-brake tonnage chart