There are two different ways of bending:
- Air bending
- Bottoming/coining
The force/pressure F for bottoming/coining is 3 up to 8 times higher than for air bending.
The die opening V should be 6 up to 12 times of the material thickness t. It also dictates the force/pressure F needed for air bending. For the choice of the opening V must be considered also the shortest flange b and the angle α. With a smaller die opening V the inside radius ri will be smaller.
With the below shown table of force and the formulas you can calculate the appropriate values. Alternatively you can use our calculator to determine the needed force.