Abstract: An apparatus for the support and the controlled advancement of a sheet in a bending machine for forming a cylindrical or conical structure, in particular of a truncated cone structure, comprises a base structural frame adapted to be positioned upstream of said bending machine, with respect to an advancement direction of the sheet, a plurality of conveying modules which can be mounted, removable, on the structural frame so as to generate a plan of modular support and advancement which can be configured geometrically according to the shape and dimensions of the sheet to be produced; the modular support and advancement plane is geometrically configured to keep the sheet metal part supported by the plane in a flat condition; an lifting and tilting device configured to vary the position of the structural frame, supporting the conveying modules, from a horizontal lying position to an inclined lying position in which the support and advancement plane is inclined downwards towards the bending machine; repositioning a

Abstract: A device for guiding and directing a metal sheet in a bending machine to form continuously a conical structure, in particular a frustoconical structure, comprises: resting and contrasting arrangement extending along a closed path, and suitable for restingly receiving a longitudinal edge of the metal sheet and contrasting a movement of the edge in a direction that is transverse to a preset advancement trajectory of the metal sheet; a supporting body for the resting and contrasting arrangement, having at least one oblong lateral portion that is suitable for facing the edge and configured for conforming the resting and contrasting arrangement to the longitudinal profile of the edge so as to obtain an extended zone of contact with said edge and impose resting and contrasting pressure distributed along the edge; the resting and contrasting arrangement is movable around the supporting body along the closed path to accompany the edge of the metal sheet by a distributed contact devoid of relative sliding and rolli

Abstract: A method for curving an elongated piece uses a digital system which includes a control console having a programmable processing unit and a screen for displaying data and a camera connected with the processing unit and configured and positioned for acquiring images of the elongated piece. In accordance with the method, the profile of at least one virtual template of curvature is stored in the processing unit and a real image of the elongated piece is detected. The profile of the virtual template and the real image of the elongated piece are reproduced and compared in real time. The roller curving machine is driven and the curvature and the geometric configuration of the elongated piece are matched with the profile of the virtual template of curvature.

Abstract: An apparatus for the support and the controlled advancement of a sheet in a bending machine for forming a cylindrical or conical structure, in particular of a truncated cone structure, comprises a base structural frame adapted to be positioned upstream of said bending machine, with respect to an advancement direction of the sheet, a plurality of conveying modules which can be mounted, removable, on the structural frame so as to generate a plan of modular support and advancement which can be configured geometrically according to the shape and dimensions of the sheet to be produced; the modular support and advancement plane is geometrically configured to keep the sheet metal part supported by the plane in a flat condition; an lifting and tilting device configured to vary the position of the structural frame, supporting the conveying modules, from a horizontal lying position to an inclined lying position in which the support and advancement plane is inclined downwards towards the bending machine; repositioning a

Abstract: A device for guiding and directing a metal sheet in a bending machine to form continuously a conical structure, in particular a frustoconical structure, comprises: resting and contrasting arrangement extending along a closed path, and suitable for restingly receiving a longitudinal edge of the metal sheet and contrasting a movement of the edge in a direction that is transverse to a preset advancement trajectory of the metal sheet; a supporting body for the resting and contrasting arrangement, having at least one oblong lateral portion that is suitable for facing the edge and configured for conforming the resting and contrasting arrangement to the longitudinal profile of the edge so as to obtain an extended zone of contact with said edge and impose resting and contrasting pressure distributed along the edge; the resting and contrasting arrangement is movable around the supporting body along the closed path to accompany the edge of the metal sheet by a distributed contact devoid of relative sliding and rolli

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, has a first and second pumps for supplying with an operating fluid a first and second actuators, position transducers and a first and second proportional valves to adjust the flow of the operating fluid into the first and second actuators according to signals of the position transducers.

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, has a first and second pumps for supplying with an operating fluid a first and second actuators, position transducers and a first and second proportional valves to adjust the flow of the operating fluid into the first and second actuators according to signals of the position transducers.

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, has a first and second pumps for supplying with an operating fluid a first and second actuators, position transducers and a first and second proportional valves to adjust the flow of the operating fluid into the first and second actuators according to signals of the position transducers.

Abstract: An apparatus for the electrohydraulic control of the parallelism of a roller in a bending machine for working metal pieces, having pump means for supplying with an operating fluid first actuating means and second actuating means; position transducer means connected operationally to an electronic control unit; and first and second proportional valve means operatively controllable by said electronic control unit to adjust the flow of said operating fluid into said first and second actuating means according to signals of said position transducer means.

Abstract: A device and a system for positioning work pieces having cylindrical and/or hollow conical bodies, to be processed in workstations. The system comprises at least a first and a second independent positioning devices for positioning and driving in rotation the work pieces to be processed; each positioning device for a base frame provided with two roll groups for supporting the work piece to be processed, each provided with parallely arranged rolls. One or both of roll groups are movable in horizontal and/or vertical direction with respect to the base frame; a gear motor is operatively connected to the roll of at least one of the roll groups for drivingly rotate the work piece to be processed.

Abstract: An automatic roll bending machine for bending metal sheets, sections and the like. The machine includes two or more bending rolls and a driver for causing rotation and/or changing the working positions of the rolls. The driver is operatively connected to an electronic control device that includes a programmable process unit provided with a movable digital control board which can be manually operated by an operator for remotely controlling in a selective manner the movements of each roll and for performing automatic execution of a bending cycle.

Abstract: A process and a roll bending machine for bending plates. The plate to be bent is made to pass between upper and lower gripping rolls parallely arranged between each other; at least one of these rolls is connected to a drive motor for rotation. One of the rolls is upwardly movable to exert a required working pressure on the plate, and it is adjustably urged against the other roll in at least one intermediate position of its length till causing a deflection of both the rolls in the same direction, making one roll to assume an arch shaped configuration substantially conforming to the configuration of the other roll, in such a way to generate an homogenous bending pressure for the entire width of the plate which is thus bent with a substantially constant bending degree.