The result of bending depends on a number of factors which have been divided into the following three chapters : plate, tools, procedure.
Higher strength plates requires greater bending springing-back force and stamping angle to bend the material. Thinner material can be bent to smaller radii and If the length of the material is less then ten-times the material thickness.
When bending HARDOX and WELDOX plates, the most important parameter is the correct stamping radius. With softer steels (up to WELDOX 500 inclusive), we recommend to bend the material using a stamping radius equal to or smaller than the required radius of the bend. For harder steels we recommend to bend the material using a stamping radius equal to or greater than the required radius of the bend.
The stamping die edges must be clean and undamaged. The force necessary to bend the material can be reduced by using as the stamping die edges rotating circular rods, or by lubricating the die edges. This will reduce the risk of breaking.
Bending force (P)
The required bending force can be estimated using the formula below. (1 ton = 10 kN).
Rm : Tensile strength
b : Bend length
t : Plate thickness
W : Die opening width