METHOD OF ROLL-FORMED CHANNEL BARS SHAPING Russian patent published in 2009 - IPC B21D5/06 

FIELD: metallurgy.

SUBSTANCE: invention relates to metal pressure working immediately dealing with manufacture of graded roll-formed sections. The flat work edge elements are bent (progressively and in multiple repeated passes) to produce a finite angle between the section wall and flanges. In the course of the first two passes the flat work edge elements are bent downwards at a specified sum angle with due regard for the flat work thickness and strength properties. In the course of the third pass the bar becomes straightened by way of passage between smooth rolls positioned at a specified width clearance with due regard for the flat work rated thickness. In the course of the passes remaining (from seven to nine) the flat work edge elements are bent upwards till the finite angle is produced.

EFFECT: enhancement of the channel bars consumer properties.

1 dwg, 1 ex