A press brake for bending a workpiece. The press brake a movable ram and a support beam. A punch is connected to the ram, and a die is connected to the support beam. The punch and the die are separated by a gap and the workpiece is placed in the gap in order to be bent. The ram is configured to be driven towards the support beam to thereby close the gap between the punch and the die. The die includes a pair of die members extending in a longitudinal direction separated by a recess having a width in a lateral direction perpendicular to the longitudinal direction. The width of the recess is adjustable by moving the die members. The die members are configured to move vertically to disengage from the support beam to thereby allow for lateral movement of the die members to adjust the width of the recess.

A bending machine for metal sheets includes a punching arrangement that supports upper bending tools, a die arrangement that supports lower bending tools, and a back gauge unit movable inside an operating area and arranged to position a workpiece. The back gauge unit has a hooking element to engage at least one lower bending tool to move it along the bending direction. The lower bending tools include a set of side lower bending tools that are positionable in a non-operative configuration outside the operating area and unreachable by the back gauge unit. The side lower bending tools are connectable to one another to form a group selectable in number. At least one of the side lower bending tools of the group is positioned in the non-operative configuration inside the operating area to be engaged by the hooking element and movable along the bending direction together with the group.

The invention relates to a machine and method for the semi-continuous cold-bending of sections (3) with low ductility, of the type comprising a horizontal mount (1) and an interchangeable tool (4) against which the section (3) is bent. The machine comprises a gantry support (10). The tool (4) is located in a zone delimited by the mount (1), vertical supports (5) for the tool (4), and a compression plate (7) actuated by vertical pressure cylinders. The tool (4) is positioned facing an actuation plane defined by a double set of hydraulic positioning (23) and push (20) cylinders. The bent sections (3) can be used for tents, skylights, facades, solar shading louvres, or three-rail frames for truck tarps, guaranteeing a uniform bend in all bent sections, without the section becoming pinned in the machine during bending.