TOOL FOR EXTRUDING DOUBLE-WALL TUBES Russian patent published in 1997 - IPC

FIELD: plastic metal working. SUBSTANCE: tool for extruding double-wall tubes includes container, extrusion ram, outer die with welding chamber, flat splitter with lug for forming intertube space and embedded needle. Said needle is provided with central supply duct and system of radial passages joined with welding chamber for forming inner tube. Tool provides supply of welding chamber by two mutually opposite metal flows. First metal flow is fed out of welding chamber of outer die through second stage of splitter. Second metal flow opposite relative to first one is fed through central duct of embedded needle. EFFECT: improved design. 4 dwg