Method for bending section-sheet, plate strip and like material

摘要

A corrugated metal sheet is incrementally bent perpendicularly with respect to its corrugations, by repeatedly transversely indenting upwardly the bottoms of the corrugation valleys so that the indentations extend in lines transversely across the sheet and extend into the corrugation sides which interconnect the valleys and ridges of the sheet. Each line of indentation causes the sheet to bend to some degree without detrimental stretching or drawing of the sheet.