METHOD TO CHECK AND CONTROL A ROLLER BENDING MACHINE FOR CONTINUOUSLY BENDING AN ELONGATED WORKPIECE AT VARIABLE CURVATURE RADII, AND MACHINE SO CONTROLLED

摘要

A method to check andcontrol a roller bending machine forcontinuously bending an elongatedworkpiece at variable curvature radii in abending machine using a series of rollersfor bending, comprises the steps ofmeasuring the distance of the elongated workpiece in a point that is situateddownstream the series of rollers for bending insuccessive instants, calculating a curvatureradius of each bend section of theelongated workpiece, comparing thecalculated curvature radius with the desiredcurvature radius and determining adifference between them, calculating thechange of position to which an upstreamroller has to be subjected in order toannul such a difference and operating theupstream roller on the base of thecalculated change of position. A machineembodying the method is also described.