Abstract: This invention relates to the bending of shaped sheet metal, which shows alternatingly occurring longitudinal ridges and valleys, the lateral portions of which constitute lateral portions of the ridges, about an axis, which extends perpendicularly to the longitudinal direction of the ridges and valleys and is in parallel with the plane of the sheet. Known methods of bending such shaped sheet metal have proved to have certain limitations with respect to applicability and smallest bending radius to be obtained in one or more coherent bending moments or steps. For eliminating these shortcomings a method of bending shaped sheet metal is proposed, at which the bending takes place in at least two subsequent moments or steps.
Abstract: This invention relates to the bending of shaped sheet metal, which shows alternatingly occurring longitudinal ridges and valleys, the lateral portions of which constitute lateral portions of the ridges, about an axis, which extends perpendicularly to the longitudinal direction of the ridges and valleys and is in parallel with the plane of the sheet. Known methods of bending such shaped sheet metal have proved to have certain limitations with respect to applicability and smallest bending radius to be obtained in one or more coherent bending moments or steps. For eliminating these shortcomings a method of bending shaped sheet metal is proposed, at which the bending takes place in at least two subsequent moments or steps.
Abstract: The invention relates to a method and a device for bending sheet-metal sections. It is previously known to bend sectional sheets, but the known art involves certain problems to bring about a non-angular bend with a small radius and without damaging the sheet. According to the invention it is proposed for eliminating said problems, that in connection with the impressing of the sheet portions located closest to the bending axis the lateral portions (1c; 32c; 50c) of the sheet are subjected to an outwardly directed force (17; 39; 56) or prestressing in a plane through the impressions (34; 59), in order to form an outward bulging (40; 58) in the lateral portions (1c; 32c; 50c) and on the same side of the sheet as the impressions (34, 59).
Abstract: 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.