METHOD FOR PRODUCTION OF BENT CHANNELS Russian patent published in 2009 - IPC B21D5/06 

FIELD: technological processes.

SUBSTANCE: invention is related to the field of metal working, in particular to technology of bent profiles profiling. Moulding is carried out by means of crimping and bending of peripheral sections and billet bottom, which correspond to side shelves and channel basis, with their further rectification in several passes. At that moulding is carried out in three stages, every of which is realised in several steps. At the first stage of moulding peripheral sections of billet are bent to achieve the angle of not more than 45°, with preservation of rectilinearity of peripheral sections and bottom of profile, which correspond to side shelves and basis of channel bar, with internal radius of curvature in zones of future angles of finished channel bar depending on thickness of billet. At that second stage of moulding billet peripheral sections are crimped to the angle of 87-89° with preservation of rectilinearity of these sections and giving transverse curvature to profile bottom with axisymmetric prominence in direction of peripheral section bending, at that starting value of prominence curvature radius is set depending on width of profile bottom and is reduced from pass to pass with preservation of internal curvature radius in zones of future angles of the ready channel bar at the first stage of moulding. At the third stage of moulding at least in two last passes, profile bottom is straightened with elimination of prominence by means of its settlement with metal distribution in direction of finished channel bar angles. At the same time side shelves are bent to angle of 90° with internal radius of curvature in zones of finished channel bar angles depending on billet thickness.

EFFECT: improved quality.

2 dwg, 1 ex