FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to production of cold rolled sections for construction structures. Formed closed section features square or rectangular cross-section and butt nearby center of one facet. Note here that every section of facet with butt has extension made up of L- and/or I-like rib. Formed section is made from strip by trimming sidewalls and making roll-formed hats. Before finishing pass, W-shape section is formed along the center while, in finishing pass, closed section is formed. Carcass frame is made from closed roll-formed hat and incorporated with 3D-structure.
EFFECT: expanded performances.
18 cl, 11 dwg
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