METHOD OF HYDRAULICALLY SHAPING METAL SHEET AND AUTONOMOUS APPARATUS FOR PERFORMING THE SAME Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely hydraulic formation of large-size parts. SUBSTANCE: fitting in the form of upper and lower tools is mounted in double-action press having foundation, inner and outer sliders mounted with possibility of reciprocation motion in vertical plane. Upper tool is mounted on upper die holder secured to outer slider. Lower tool is secured to upper part of foundation. Clamping of sheet blank along its periphery is realized by means of clamping surface of lower tool and member having clamping surface turned downwards and being monolithic with upper tool. The last has shaping cavity. Sheet blank is deformed in shaping cavity of upper tool by liquid pressure created by hydraulic units driven at engagement with inner slider of press. EFFECT: simplification of method, improved design of apparatus. 13 cl, 13 dwg