METHOD OF SEMICONTINUOUS EXTRUSION OF ARTICLES Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: method of extrusion of aluminium alloy products comprises steps of feeding a billet into a container with a remainder of billet, pressing out the billet in contact with the remainder of the billet and extruding the billet together with remainder of the billet through a die; piercing a zone of a plane of a butt of the billet and the remainder of the billet upon pressing out stage in direction, normal relative to an axis of the container; before extrusion of the billet and the remainder of the billet through the die sealing a pierced opening by hydrostatic pressure of the pressing out stage; piercing ends, being welded, by a value no less, than a diameter of the billet. EFFECT: enhanced quality of products, being extruded. 2 cl, 5 dwg