METHOD FOR MANUFACTURING OF BENT CHANNEL Russian patent published in 2009 - IPC B21D5/06 

FIELD: technological processes, metal working.

SUBSTANCE: invention is related to metal forming, in particular, to production of cold-bent section bars of rolled metal. Serially in passes strip billet elements are bent by rollers of profile-bending machine with specified angles and radiuses of bend. In I…IV passes side walls of section bar are bent to a certain angle with preservation of horizontal position of its large and small shelves, and in V pass flanging is started to be shaped as directed downwards on large shelf, and this process ends when vertical position of flanging is achieved in the last X pass. Besides, molded strip is cut into cut lengths after VII pass as certain bending angle is achieved in side walls, and small shelf is bent down at a certain angle from horizontal line with preservation of horizontal position of large shelf in all passes. After cutting small shelf is unbent to horizontal position, and in the last but one pass side walls are bent inside section bar with their further unbending. After cutting into cut lengths all radiuses of bending may be identical and equal to double thickness of section bar.

EFFECT: improved quality of channels due to better geometry and reduction of production inputs.

2 cl, 1 dwg, 1 ex