METHOD FOR FORMING HOLLOW PARTS FROM FLAT SHEET BLANKS Russian patent published in 1997 - IPC

FIELD: plastic metal working; may be used for manufacturing complex-shape hollow parts. SUBSTANCE: flat sheet blank 7 is placed in pack of two shaping members 4, 19 made of easy-to-deform material and having flat surfaces contacting with blank. Opposite convex 5 and concave 20 surfaces correspond to part shape. The pack with blank is upset in axial direction between flat strikers 2, 11. Easy-to-deform material of shaping members 4, 19 may be polyurethane or rubber having respective hardness. Shaping member with concave initial surface 19 is cooled after forming, for example, by liquefied nitrogen until hardening it. when formed part 22 is removed shaping member is recovered to its initial state. EFFECT: reduced energy and labor consumption, and reduced cost price of manufacture. 3 dwg