SHEET FORMED SECTION Russian patent published in 2009 - IPC B21D13/10 B21D5/06 

FIELD: metallurgy.

SUBSTANCE: sheet formed section allows entire corrugations, walls of which are inclined into the side of corrugations basis. There are curvature radius between walls and horizontal sections of corrugations. Width of corrugations basis is less than width of its tops. Additionally basis of corrugations' side walls are implemented as adjoined to each other or with a clearance and are located in particular ratio: corrugations height with its maximal width, curvature radius - with sheet thickness, and distance between corrugations - with its maximal width. Additionally walls are inclined under particular angle to its vertical axis line.

EFFECT: it is increase stiffness of formed section, and there are improved its consumer properties.

2 cl, 2 dwg, 1 ex