METHOD FOR DRESSING OF EQUAL DOUBLE-LAYER ANGLE Russian patent published in 2009 - IPC B21D5/06 

FIELD: technological processes.

SUBSTANCE: starting from the first pass, edges of wider lower strip are bent so that it embraces side edges of upper strip with certain angles of bending in the first three passes, and in the last but one and last passes - with provision of total angle of its edges bending, which is equal to 180°. Starting from the fourth pass, simultaneously two strips are serially bent in passes with bending angle in the last pass, which is equal to 1°.

EFFECT: higher quality of double-layer angles.

4 cl, 1 dwg, 1 ex