Abstract
SUMMARY Starting with a three-dimensional wire-frame data list, a shell-type boundary representation solid model is automatically created to represent sheet metal objects. This model contains the geometric data and topological relationships required to automate the flat pattern layout process and bend allowance calculation encountered in brakeforming. These features are incorporated into a software program called LAYOUT.LU, that uses a ring-type database structure to store data and uses real-time dynamic graphics to illustrate the layout and bend allowance process. Initial graphics exchange standard (IGES) formatted data can be provided as input and IGES output formats of the flat pattern are generated.
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