Free Engineering Tool

Springback / Overbend Calculator for Sheet Metal Bending

Predict springback angle, the press-brake overbend setpoint and final radius using the ASM springback ratio Ks = 4x³ − 3x + 1, based on material, thickness and bend radius.

1 · Material

Select a material to auto-fill Young's modulus E and yield strength σy, or choose “Custom value…”and enter values from your material certificate.

2 · Material Properties

Young's Modulus E

GPa

Yield Strength σy

MPa

3 · Bending Geometry

Sheet Thickness t

Inside Bend Radius R

Target Bend Angle α

Overbend Angle (Press-Brake Setpoint)

102.2°bend to this angle so the part relaxes to 90°

Springback Angle

12.24°elastic recovery after unloading

Springback factor Ks0.88R岬?/ R_f (1 = no springback)

Final radius R_f11.36 mmloaded radius / Ks

Dimensionless x = σy·R/(E·t)0.04governing springback group

r/t ratio10inside radius / thickness

Large springback — high-strength or low-modulus material with a generous radius. Increase overbend and verify with a first-article part.

ASM springback-ratio model (ASM Handbook Vol. 14B): Ks = 4x≈ −3x + 1 with x = σy·R/(E·t). First-order estimate …"real springback also depends on tooling, friction, strain hardening and material-lot variation. Use the overbend angle as a starting setpoint and fine-tune with a first-article bend.

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