METHOD FOR MAKING CONE SHELLS Russian patent published in 2002 - IPC

FIELD: plastic metal working, namely bending sector type sheet blanks, possibly in industry branches needing manufacture of cones made of sheet metals. SUBSTANCE: method comprises steps of placing sector=like sheet blank in apparatus for clamping edges, said apparatus is in the form of horizontal uniformly and radially arranged levers that may be rotated in vertical plane from periphery towards central axis of apparatus; fixing by means of clamps peripheral edges of blank along its outer and inner radiuses in order to provide fixation of blank on said levers with possibility of circumferential sliding of blank on lever surface. At process of applying efforts to levers, the last are rotated for folding blank to cone in such a way that to approach its end edges one to another. Rotation angle of levers is set according to conicity angle of shell. When end edges of blank are in mutual contact, they are mutually joined by electric welding and clamps are released for extracting ready cone. Method provides possibility for making cone shells with wide range of apex cone angles, namely 20-179 degrees due to applying effort to the whole surface of blank. EFFECT: improved accuracy of parameters of made shell cones. 2 dwg