Patent ID: 9707608
Date: 2017-07-18
CPC Classifications: B21D,C21D

Claim:
1. Method for bending a workpiece of sheet metal along a bending edge between a bending die and a bending punch of a bending tool arrangement, whereby a strip-shaped deformation region on the workpiece containing the bent edge to be produced is heated in a first time period before and/or during the bending process to a deforming temperature below the fusion temperature of the metal via a heating device integrated in the bending die to increase deformability of the workpiece locally, wherein the workpiece is heated in a second time period before and/or after the bending operation in at least one heating zone that is different from said strip-shaped deformation region via the application of energy from outside the workpiece by said heating device integrated in the bending die to raise the temperature of said at least one heating zone, starting from an initial temperature to a processing temperature below the fusion temperature of the metal, wherein said heating device integrated in the bending die heats said strip-shaped deformation region and said at least one heating zone one after the other such that the first time period does not overlap the second time period, and wherein said workpiece is positioned and handled in relation to said heating device manually or via a programmable handling device.