METHOD FOR SHAPING DOUBLE-CURVATURE PARTS Russian patent published in 2002 - IPC

FIELD: plastic metal working, namely manufacture of members of envelopes welded in dies. SUBSTANCE: method comprises steps of shaping blank at first and second transitions at successively pressing down beginning from wide end edge of tore portion of blank; at first transition making spherical surface and tore portion of surface with predetermined curvature radius in width direction; at second transition making tore portion of surface with predetermined curvature radius in meridional direction. At first and second transitions shaping is realized in the same universal die set with spherical lower die and punch. EFFECT: lowered labor consumption, enhanced quality of articles. 2 dwg