How to use
For 90° air bending, enter thickness, bend length, tensile strength in N/mm² and V opening in mm. Results use kN and metric tonnes-force.
Example calculation
Rm = 600 N/mm², L = 1000 mm, t = 3 mm, V = 24 mm → F = 319.5 kN ≈ 32.57993 tf.
Calculation method
F[kN] = 1.42 × Rm[N/mm²] × L[mm] × t²[mm²] / (1000 × V[mm]) tf = F / 9.80665
Calculation limits
Estimate restricted to V/thickness ratios 6–12. Excludes coining and bottoming. Check the machine and tooling’s length-dependent load ratings.