FIELD: technological processes.
SUBSTANCE: in dressing of equal double-layer channel, edges of wider lower strip flat work are bent so that it embraces lateral edges of upper strip with specified angles of bending in the first, second, last but one and last passes with provision of total angle of its edges bending equal to 180°. Starting from the second stage, two strips are bent simultaneously and serially in passes at specified angles to arrange the right angle between flanges and walls of channel with specified radiuses of bending places and with specified maximum value of bending angle per stage.
EFFECT: higher quality of double-layer equal channels.
4 cl, 1 dwg, 1 ex
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