METHOD OF MAKING SPHERICAL VESSELS Russian patent published in 1996 - IPC

FIELD: metal forming. SUBSTANCE: method comprises steps of bending sheet blanks in the form of half-rings to cone shells and welding them along their generatrices; providing an apex angle of the cone shell, being equal to 60 degrees, a diameter of its large base, being equal to doubled diameter of its small base and to a diameter of the spherical vessel; welding to the small base of each cone shells flat discs with formation of cone cups, being mutually welded to form a hollow welded blank; subjecting the hollow blank, had been received, to hydraulic blowing until formation of the spherical vessel. EFFECT: enlarged using range of the method. 1 cl, 5 dwg