METHOD FOR MANUFACTURE OF ENCLOSURE IN SUPERPLASTICITY STATE Russian patent published in 1995 - IPC

FIELD: aircraft construction, ship building and chemical industry for production of closed vessels by superplastic forming. SUBSTANCE: method involves obtaining semifinished product with cavity by welding flat billets along their perimeters; forming outer side surface of semifinished product and side surface of product cavity in the form of toroidal surfaces, with R/r ≅ 4 being observed, where R is radius of outer toroidal surface of semifinished product; r is radius of toroidal surface of product cavity; deforming semifinished product by supplying medium under pressure into its cavity. EFFECT: increased efficiency and improved quality of product. 4 cl, 4 dwg, 1 tbl