APPARATUS FOR STRETCHING SHEET BLANKS Russian patent published in 2001 - IPC

FIELD: plastic metal working, namely, sheet forming. SUBSTANCE: apparatus for stretching sheet blanks includes holders for rigidly holding mutually opposite edges of blank. Holders have upper and lower parts with restricted ribs. Holders may perform simultaneous different-direction motion after holding blank, namely, one holder may descend and other opposite holder may raise at stretching blank in order to provide necessary ultimate strength of material for its subsequent shaping. EFFECT: material economy, increased degree of material shaping, necessary strength and rigidity of parts, simplified design of die set. 2 dwg