Tool and Die Practice Exam

Springback happens because steel elastically rebounds after the bending load is removed, so the final bend tends to be less than intended. Overbending intentionally forms the bend beyond the target angle while under load, so when the material relieves its elastic rebound, the bend settles into the desired angle. This makes overbending a practical and reliable way to compensate for springback. Increasing punch speed can affect flow and friction but doesn’t reliably control the elastic recovery, and widening die clearance mainly changes formability and geometry rather than correcting springback. Underbending would leave the final angle short of the target rather than compensate for rebound.