FIELD: machine building.
SUBSTANCE: invention relates to the field of engineering, in particular to the treatment of metals by pressure, can be used to process shaped pipes of square, rectangular cross-section, in particular, for the manufacture of curls, monograms for arches, gates, fences, lattices for windows, elite and dacha furniture. On the opposite walls of the profile tube, stiffeners are formed by rolling inwardly a portion of the pipe wall. At least one end of the profile pipe is deformed along the non-rolled sides until the stiffeners come into contact with each other to form an end portion with transition zones from the said section to the base material. Moreover, when the at least one end of the pipe is deformed in the area of contact between the stiffeners, a decorative element is formed on the said ribs. Profile pipe is then cut into blanks. To form a decorative element, matrices with structural elements in the form of protrusions and their corresponding grooves are used.
EFFECT: quality of blanks is increased and technological possibilities are widening.
7 cl, 7 dwg
