FORMED CLOSED SECTION, METHOD OF PRODUCING FORMED CLOSED SECTION, 3D-STRUCTURE CARCASS FRAME WITH SAID SECTION AND 3D STRUCTURE INCORPORATING SAID CARCASS FRAME

摘要

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