FIELD: technological processes.
SUBSTANCE: inventions of the group relate to metal forming and can be used for forming an element with a trough-shaped cross-section shape by a method of free bending of a workpiece from a steel sheet with ultrahigh tensile strength. Near workpiece area formed into flange on inner peripheral side of bent section of element is provided with section facilitating material flow, which increases value of bent section, which flows into section of workpiece, formed into flange on inner peripheral side of bent section.
EFFECT: elimination of crack formation in flange on inner peripheral side of bent section.
23 cl, 22 dwg, 2 tbl
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