METHOD FOR MAKING HOLLOW CYLINDRICAL ARTICLES Russian patent published in 2003 - IPC

FIELD: plastic metal working, possibly manufacture of hollow cylindrical articles having tube with constant or variable section of outer lateral surface and single-side flange, for example making large-size ingot molds of copper alloys for arc furnaces. SUBSTANCE: method comprises steps of heating billet; feeding billet with axial opening into container; extruding cylindrical portion of article into gap between working duct of die and movable press mandrel having constant or variable cross section with annular turnings; removing remainder of billet; shaping flange in cavity restricted by end of container and die holder. Invention provides possibility for making flange whose diameter is more than that of container and further extrusion of tube whose outer diameter is less than that of container at forward extrusion and is equal to diameter of container at pressing out tube onto punch. EFFECT: possibility for making monolithic construction with stable and uniform mechanical and heat conducting properties along the whole volume of article. 2 cl, 2 dwg, 1 ex