Patent ID: 6722181
Filing Date: 2004-04-20
Classification: B21D

Abstract:
A method for bending work having a plate shape by moving a die toward the work, the work butted against a butting member, the method comprising:computing an initial operation amount of the die from a target bending angle; positioning the butting member according to a target bending dimension; performing a trial bending step for bending a work by moving the die according to the initial operation amount with the work being butted against the positioned butting member; measuring a measured bending angle and a measured bending dimension of the work bent in the trial bending step; determining that the measured bending angle of the work disagrees with the target bending angle; computing a correction value for the initial operation amount of the die to provide a corrected operation amount; computing an estimated bending dimension of the work; correcting a position of the butting member according to the estimated bending dimension such that the butting member is disposed in a corrected position; and bending a second work by moving the die the corrected operation amount, the second work being butted against the butting member disposed in the corrected position.