FIELD: plastic working of metals.
SUBSTANCE: method comprises steps of bending sheet blank in lengthwise direction till full angle of embracing and then stretching it over stretching punch. Sheet blank mounted in rectilinear clamping devices is stretched at restricting region of deformation propagating along surface of facing during the whole process of shaping by means of profiled elastic fluid of portal. In variants of invention stretching punch and portal for making double-convex and double-concave facings are mounted with possibility of their motion one to other. Elastic fluid is profiled according to laws given in claims of invention.
EFFECT: improved quality of parts of double-curvature facings due to equalized elongation deformation, possibility for making equal-thickness facing at minimum tapering for one pass.
3 cl, 6 dwg
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