Abstract
Abstract
A flanging operation in stamping is basically a bending operation that bends the edge of a part for several purposes. Flanging with a curved bending line causes in-plane deformation, although not significant, in contrast with straight-line bending, which is the development method that is widely used in the stamping industries and usually fails to predict an accurate trimming line. Since the inverse mosaic method generally provides a good prediction when the in-plane deformation is insignificant, the inverse mosaic method can be used as a trimming design tool. As the shape of the stamped part is three-dimensional in general, the original inverse mosaic method which maps a three-dimensional shape on to a two-dimensional plane has been extended to the mapping of three-dimensional shapes by the introduction of a contact algorithm. By mapping the target shape, i.e. the desired shape after trimming, on to the first stamped shape, the trimmed shape after the first stamping can be obtained. The validity of the current method has been verified through an actual front-fender example.