FIELD: process engineering.
SUBSTANCE: invention relates to machine building, particularly, to metal forming, and can be in used in making sections from strips at roll forming mill. At starting passes, force of tangential reduction to not over 2-5% is applied to blank ends. At subsequent passes, directed tensile loads are applied by tool in contact with blank solely over would-be section flexure inner radii starting from blank ends.
EFFECT: higher quality.
3 dwg
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