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United States of America Patent
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Mar 22, 2005
Grant Date -
Feb 13, 2003
app pub date -
Aug 22, 2002
filing date -
Feb 22, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to workpiece control shaping of metal, preferably in the form of plates or bands, which metal workpiece has a high tensile limit, preferably about 1000 N/mm.sup.2, and is intended to be further shaped. Along predetermined folding notches or zones across the workpiece, the tensile limit of the material is reduced by heating to a tensile limit, which is substantially lower than that of adjacent base material, and when the workpiece has cooled it is subjected to subsequent bending, folding, or shaping operations to provide a two- or three-dimensional shape/extension of the workpiece along the treated folding notches or zones.
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