| 摘要 |
Forming press for making perimetral bends on metal sheets or plates comprising a support structure having a C-shaped cross section with horizontal arms, a fixed lower counterblade, and an upper blank counterblade, movable in a vertical direction, a cutter block carriage, movably guided in the vertical direction between the arms of said support structure, an upper bending blade and a lower bending blade mounted on said cutter block carriage and having respective active parts cooperating with said counterblades for the downward and upward bending of the edge of a plate firmly held by the counterblades. In order to prevent the surfaces of the plates, when particularly treated, e.g. satinized, prepainted or coated with protective layers, from being subjected to laceration, microfissuring or to more or less diffuse cracks during the bending, at least one of the bending blades is adjustably movable toward and away from the counterblades from a prefixed initial variable position, at which a prebending is carried out, to a second variable prefixed position closer to the counterblades at which the bending is completed. |
