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

FIELD: technological processes, metal forming.

SUBSTANCE: invention is related to metal forming, in particular, to manufacturing of cold-bent section bars from steel strip with polymer coat. Serially in passes strip billet elements are bent by rollers of profile-bending machine with specified angles and radiuses of bend. Besides, bend radiuses are identical in all passes and are equal to thickness of steel base. Besides, in I…IV passes channel-shaped section bar is formed with certain bending angles per pass, and in V pass lower part of channel shelves is started to be bent inside with certain angles of bending between formed vertical and inclined elements. In the last but one pass touching horizontal edge elements of section bar are created with a certain thickness, and in the last pass they are squeezed by rollers to obtain required thickness.

EFFECT: improved quality of section bars.

1 dwg, 1 ex