Patent ID: 7503200
Filing Date: 2009-03-17
Classification: B21D,B30B,Y10S

Abstract:
1. A method of correcting a bending operation performed by a press brake comprising the steps of providing two side frames integral with a fixed beam, a movable beam, and with displacement means for displacing the movable beam resting on said two side frames, and sensors, fixed respectively to the two side frames, measuring forces exerted by said displacement means on the said side frames, providing deformation compensation cylinders associated with one of the two beams, and an electronic control device for controlling the displacement of the movable beam between a top dead centre and a bottom dead centre, pre-recording a calibration diagram in a memory of the electronic control device using calibration pieces of lengths shorter than 10% of the length between two said cylinders, the said diagram establishing a correspondence between forces measured by the sensors associated with the side frames and pressures that can be applied to said compensation cylinders of the beam carrying them, in order to keep the said beam substantially straight, and applying pressures during a subsequent bending operation, to the said compensation cylinders corresponding to the forces measured at the said sensors according to said diagram.