| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: invention is related to rolling production, in particular to technology of cold-bent section bars. Flat work is bent serially as per passes to produce shelves and walls of channel bar. At that in the first three passes, flanges are bent inside profile according to the mode given in invention formula. Concave wall is produced, starting from the second pass by upward bending of wall with creation of bent edge sections, after achievement of a certain angle between wall and shelves, flanges are created in shelves, which are bent to a certain angle with simultaneous downward bending of wall edge sections by a certain angle and with creation of the right angle between these sections and shelves. In the last but one pass the shelves are bent to a certain angle with preservation of the right angle between them and mentioned edge sections. In the last pass the shelves are bent inside at a certain angle. ^ EFFECT: improved geometry of special-purpose channel bars. ^ 1 dwg, 1 ex |
