Improvements in Method of Forming Tubular Articles by Extrusion.


130,059. Raworth, J. E., (Pressed Metals, Ltd.). Jan. 10, 1918. Billet-piercing; dies. - Billets of uniform material for tubular metal articles are made from billets of heated cast metal which are subjected to a uniform pressure in a confined space, and the surplus metal is extruded by co-operating punches. The billet 1 is slightly tapered, has a bevelled bottom 3, and is arranged in a die with a perforated bushing 4 at the bottom. The punch 5 first descends, and then the punch 7, causing the billet to fill the recess 2 completely, the surplus metal being extruded through the bushing.




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Cited By (3)

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    US-3577759-AMay 04, 1971Cerro CorpMethod of and apparatus for preparing copper and brass billets for extrusion into hollow shells
    WO-2010115405-A1October 14, 2010Tekfor Cologne GmbhHerstellungsverfahren von rohrmaterial
    WO-9534387-A1December 21, 1995Mannesmann AgMethod of producing a seamless hot-finished tube