Method and apparatus for the extrusion of tubes of easily oxidized materials
OwnerFranz-Josef Zilges, Heinrich Kutzinventors
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Abstract
A tube extrusion press extrudes tubes through the annular space formed when a mandrel projects into the aperture of an extrusion die. In order to prevent oxidation of the extruded product, the outside of the tube passes into a cooling section immediately downstream of the die, and a protective gas is blown into the interior of the tube through the mandrel which is hollow and has an opening in its tip. Both the inside and the outside of the tube may be coated with a liquid emulsion, and the hollow mandrel can have internal channels for the passage of a cooling liquid.
Claims5
An extrusion press for extruding tubes of readily oxidizable material from pierced billets, comprising a counter platen, a cylinder cross-head, tie rods connecting the counter platen and cylinder cross-head, a reciprocating cross-head, a billet container, an extrusion die holder, an extrusion die supported by said die holder, means to move said moving cross-head, billet and billet container relative to said die holder, a mandrel insertable into said pierced billet, said die, die holder, billet container, moving cross-head and mandrel being cooperatively associated so that when said billet container is moved toward said die holder it moves said billet and billet container towards said die to extrude said billet into a tube, and means cooperatively associated with said mandrel for passing a protective gas into the interior of the extruded tube.
Dependencies are inferred from the claim text.