FIELD: metallurgy.
SUBSTANCE: loading a sheet blank into a die, pressing a blank flange, drawing the central part of blank by means of a punch into working cavity of the die with simultaneous braking of the blank flange by constriction ribs and additional ribs. Radial tensile stresses are created by constriction ribs arranged equidistantly relative to a die opening, tangential tensile stresses are created by additional constriction ribs extending beyond the blank limits. In this case, the additional ribs facing the side of the matrix opening are made conjugated with the constriction ribs by radii equal to 3.0-3.5 of initial blank thickness with positive allowance for sheet thickness.
EFFECT: increased accuracy of dimensions of the parts.
2 cl, 5 dwg
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