Workpiece controlled shaping of metal, preferably in the form of plates or bands, comprises heating the workpiece across notches or zones to reduce locally the tensile strength

摘要

Workpiece controlled shaping of metal, preferably in the form of plates or bands of high tensile limit, preferably above 1000N per square mm, comprises heat treating the workpiece in planar form along notches or zones to reduce locally the tensile limit. The workpiece is then bent, folded or shaped along the heat-treated notches or zones, either directly or after cooling.