Springback Estimator
Predict springback and the overbend angle required so parts finish at the target angle after release.
Using this calculator responsibly
The Springback Estimator is an engineering aid for checking a shop-floor estimate before a setup, quote, or process review. Enter values in the units shown, confirm material properties against the applicable specification, and keep a record of the assumptions used. Calculator output does not override machine capacity, tooling limits, part requirements, or a qualified engineer's approval.
Before using a result in production, repeat the calculation with the extreme values allowed by the print or process window. Check that the selected material, thickness, geometry, and safety factor reflect the actual job. If a result approaches a press, die, fastener, or machine limit, stop and verify it with the equipment manufacturer or responsible engineer.
Inputs and results
Read every field label before entering data and avoid mixing inch and metric values. A useful result should be traceable to the job number, revision, material certification, and machine or tooling record. Treat warnings, invalid ranges, and unusual outputs as reasons to inspect the inputs rather than as values to work around.
After the punch lifts, elastic recovery opens the bend. Higher strength, larger radii, and thinner material all increase springback.
Compensate by overbending to a tighter angle so the part relaxes onto the nominal angle, or by bottoming/coining to set the bend.
Formula: Overbend angle = Target + Springback compensation
Worked example
- If a 90° target springs back by 3°, form the part to about 87° so it relaxes to 90°.
- Verify on a sample — springback is sensitive to lot-to-lot material variation.
Frequently asked questions
How do you compensate for sheet metal springback?
Overbend the part beyond the target angle by the expected springback angle, coin the bend radius at bottom dead center, or use relief grooving on high-strength alloys.
Why do high-strength steels spring back more than mild steel?
Springback is directly proportional to yield strength divided by elastic modulus (Sy/E). High-strength steels store more elastic strain energy before plastic deformation.