Extrusion with specifiable or variable wall thickness
AssigneeBattelle Memorial Institute
InventorsBrandon Scott Taysom, Scott A. Whalen
Life of this patent
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Abstract
An extrusion system can establish or adjust a position of a tapered, rotationally fixed mandrel with respect to a die orifice to adjustably establish or vary an extrusion aperture width therebetween. This, in turn, can adjustably establish or vary a wall thickness of a tubular extrusion product formed by the extrusion. A die tool can provide rotational shear force and axial compression force to plasticize a billet material for extrusion. The rotationally fixed mandrel can include a lateral outer dimension that varies along a longitudinal direction to vary an inner boundary of the extrusion aperture in response to movement of the rotationally fixed mandrel with respect to the die tool along the central longitudinal axis.
Claims22
A system, comprising:
- a die tool, comprising a die face defining a die face orifice and a central longitudinal axis extending through the die face orifice, the die tool configured to have relative rotational motion about the central longitudinal axis to engage with a billet;
- and
- a mandrel that forms an extrusion aperture when extended through the die face orifice, the mandrel including a lateral outer dimension that varies along a longitudinal direction to vary an inner boundary of the extrusion aperture in response to movement of the mandrel with respect to the die tool along the central longitudinal axis.
An article of manufacture, comprising:
- a shear-assisted extrusion product, comprising a tube defining an inner lumen having a length, the tube having a fixed outer diameter, the inner lumen defining a varying inner diameter along the length of the inner lumen.
A method, comprising:
- positioning a mandrel within a billet material in a container at a position such that an extrusion aperture between the mandrel and a die tool is a specified inner diameter, wherein the mandrel comprises a lateral outer dimension that varies along a longitudinal direction to vary an inner boundary of the extrusion aperture;
- and
- extruding a portion of the billet material within the container through the extrusion aperture in response to a rotational shearing force and an axial extrusion force being applied to a face of the portion of billet material by the die tool, wherein the specified inner diameter of the extrusion aperture varies in response to movement of the mandrel with respect to the die tool along a longitudinal axis of the die tool.
Dependencies are inferred from the claim text.