Cosmetic centerlines are not a feature of the folded model. They represent features of the folded model on the flat pattern and subsequent drawings of the flat pattern. Examples include: a die-formed lofted flange model that requires manufacture using a press brake, cross-break (stiffening) creases or flattened features which contain no bend zone extents (spline face).
Autodesk Inventor sheet metal flat patterns support the creation and use of cosmetic centerlines and the resulting bend extent lines. Cosmetic centerlines allow the ability to utilize lines sketched on the flat pattern as bend lines within a drawing. Drawings of flat patterns can include cosmetic centerlines within bend tables or through annotation call-outs. These tables and notes can include attribution applied during the creation of the cosmetic centerline.
Sketch lines that cross over holes on a flat pattern produce cosmetic centerlines that span the hole. For example, the cosmetic centerline and bend extents are not trimmed to the hole boundaries. Sketch lines that are constrained to an edge on the flat pattern result in cosmetic centerlines and bend extent lines trimmed to the edge. Unconstrained sketch lines result in cosmetic centerlines and bend extent lines that are untrimmed