Designing a die face for your stamped or drawn part isn’t as easy as creating a negative of the part.
To ensure that the metal stays in place and that thickness tolerances are met, engineers will have to create addendum features to the stamping tool.
These additions to the die and stamping equipment will hold and guide the stretching and forming of the sheet metal into the appropriate shape. Then, all the excess that was clamped and guided by these die additions is trimmed from the final part.
For instance, if an automotive engineer were designing a die for a door frame, he or she would have to fill in all the holes and extend the sheet far enough so that the binder could hold the metal down. These excess parts of metal would then be cut out to create the shape of the door frame and to add room for the window and door mechanisms.