METHOD FOR CUTTING THROUGH SHEET WITH HIGHER FATIGUE RESISTANCE AND PRODUCED SHEET Russian patent published in 2010 - IPC B21D28/26 B21D5/00 B21D11/20 B21D13/00 B26F1/00 

FIELD: technological processes.

SUBSTANCE: invention pertains to metal forming, particularly to bending of sheet materials having structures that promote bending. Sheet of material has multiple structures that promote bending, which are configured and arranged so that the bending is carried out along the bending line. Structures that promote bending have arched return parts stretched from the opposite ends backwards along structure that promotes bending in direction towards other return part, and each return part has length and radius of curvature that reduce stress concentrations. Length of arched return part exceeds double thickness of sheet. Side distance, for which the structures promoting bending are shaped from the bending line, is minimised by small radiuses of arches, which join return parts with remaining parts of structures that promote bending. The method is also described for shaping of structure from sheet of material, so that it resists cyclic load, as well as method to increase resistance of structure fatigue developed by bending of material sheet along bending line, having multiple structures that promote bending.

EFFECT: quality improves as a result of better configuration and improved resistance to fatigue.

32 cl, 8 dwg