FIELD: metallurgy.
SUBSTANCE: workpiece of a closed shape with a central slit is cut from the metal plate. Herewith the outer surface and the surface of the central hole are equidistant. The workpiece is located between the bending and thrust rollers of the roll forming machine and its individual sections are bent with increasing or decreasing its curvature radii.
EFFECT: increasing the accuracy of the parts.
4 cl, 6 dwg
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