Process and device for extruding hollow sections
AssigneeSwiss Aluminium Ltd.
InventorsAlfred Wagner, Adolf Ames
Life of this patent
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Abstract
A process for the extrusion of tubes or similar hollow sections from a billet is disclosed within the billet is forced against a hollow extrusion die surrounding a mandrel and a mandrel support. A core passing through the extrusion billet moves in the direction of extrusion with the billet and is led through the mandrel into the space inside the resultant hollow section. The process of the present invention relieves the die of the high stresses which can otherwise lead to early failure of the die.
Claims20
A method for extruding hollow sections or the like comprising:
- loading a hollow billet into a container;
- locating an extrusion tool comprising a die, a hollow mandrel and a mandrel support at the end of said container such that said die surrounds said hollow mandrel;
- moving a hollow stem in a first direction into said container from the opposite end thereof so as to urge said billet through said die so as to form said hollow section;
- and
- passing a core through said stem, said hollow billet and said hollow mandrel thereby reducing the high stresses on said hollow mandrel and said mandrel support.
An apparatus for extruding hollow sections or the like comprising:
- an extrusion tool comprising a hollow mandrel, a die which surrounds said hollow mandrel and a mandrel support;
- stem means positioned with respect to said extrusion tool and movable in a first direction for forcing a hollow billet therethrough;
- and
- core means movable in said first direction through said stem, said hollow billet and said hollow mandrel whereby said core aids in the extrusion of said billet while at the same time reducing stresses on said hollow mandrel and said mandrel support.
Dependencies are inferred from the claim text.