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Bend unfold calculator
Flat pattern length, bend deduction, K-factor and air-bend springback for a two-flange V-bend — mild steel, stainless and aluminum.
Outside-leg unfolding with an empirical springback. Grain, tooling and bottoming change the real blank — check a first-off.
Included angle · 90°
Inputs
Thickness
Thickness
mm
V opening
Flange A
mm
Flange B
mm
K-factor
Outside legs, to the mold line.
Results
Flat length
94.4mm
Punch angle 88.4° · Springback 1.6°
- Bend allowance
- 7.8 mm
- Bend deduction
- 5.6 mm
- Outside setback
- 6.7 mm
- Inside radius Ri
- 3.7 mm
- V opening
- 24 mm
- Min. flange
- 17 mm
Formulas
L = A + B − BD BD = 2·OSSB − BA
BA = θ · (Ri + K·t) OSSB = (Ri + t)·tan(θ/2)
Punch ≈ included − Δ Δ ≈ c · (Ri/t) · θ
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