Patent ID: 8646300
Filing Date: 2014-02-11
Classification: B21D,G05B

Abstract:
1. A method to check and control a roller bending machine for continuously bending an elongated workpiece at variable curvature radii, the roller bending machine using a series of driving rollers for bending, comprising: measuring a distance of the elongated workpiece in one point that is situated downstream of said series of driving rollers for bending and lays in a direction of one distance meter, said distance measuring being executed to obtain a distance between said one point and a fixed position of the distance meter in successive instants; calculating a curvature radius of each bend section of the elongated workpiece; comparing the calculated curvature radius with a desired curvature radius in said bend section having a position and a length that is measured concentrically to the elongated workpiece by a length meter, and determining a difference between said calculated curvature radius and said desired curvature radius; calculating a change of position to which an upstream roller has to be subjected in order to annul said difference between said calculated curvature radius and said desired curvature radius; and operating said upstream roller on a basis of said calculated change of position, wherein the machine bend is corrected while the actual radius of a section is being formed, and the bend section curvature radius is measured in successive instants while the actual bend radius in the elongated workpiece is being formed.