METHOD FOR MANUFACTURE OF HOLLOW SPHERICAL ARTICLES Russian patent published in 2002 - IPC

FIELD: manufacture of hollow articles. SUBSTANCE: method involves cutting flat article work pieces, with members of development surface of truncated icosahedron comprising twelve equal regular pentagonal faces and twenty equal hexagonal faces being used for cutting. Hexagonal faces have unequal sides, with alternately arranged sides of two sizes, with three axes of symmetry through 120 deg, with ratio of smaller and larger sides being within the range of 0.692 plus and minus 0.2. Hexagonal faces are joined to one another with their smaller sides and to pentagonal faces with their greater sides. Method allows surface of produced hollow article to approximate spherical surface and is preferably used for manufacture of reservoirs, enclosures, cupolas, balls etc from various materials such as metals, plastics, leather etc. EFFECT: simplified method and increased efficiency. 3 dwg