System and process for formation of extrusion products
AssigneeBattelle Memorial Institute
InventorsCurtis A. Lavender, Vineet V. Joshi, Glenn J. Grant, Saumyadeep Jana, Scott A. Whalen, Jens T. Darsell, Nicole R. Overman
Life of this patent
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Abstract
Devices and processes for performing shear-assisted extrusion include a rotatable extrusion die with a scroll face configured to draw plasticized material from an outer edge of a billet generally perpendicularly toward an extrusion orifice while the extrusion die assembly simultaneously applies a rotational shear and axial extrusion force to the billet.
Claims11
An extrusion device for shear-assisted extrusion, comprising:
- an extrusion die with a scroll face in the form of a spiral that surrounds an extrusion orifice arranged in a center of the extrusion die, the scroll face configured to spin with respect to a billet to draw plasticized billet material from an outer edge of the billet in contact with the scroll face toward the extrusion orifice while applying a simultaneous rotational shear and axial extrusion force to the billet;
- whereby the extrusion die is configured to extrude the plasticized billet material through the extrusion orifice yielding an extrusion product with microstructure grains in the extrusion product that are one-half the size of microstructure grains in the billet prior to extrusion.
An extrusion process, comprising the steps of:
- simultaneously applying a rotational shearing force and an axial extrusion force to a billet while contacting one end of the billet with a scroll face of an extrusion die in the form of a spiral that surrounds an extrusion orifice arranged in a center of the extrusion die, the scroll face configured to spin with respect to the billet to engage and move plasticized billet material toward the extrusion orifice whereby the plastically deformed billet material flows from an outer edge of the billet through the orifice forming an extrusion product with microstructure grains one-half the size of microstructure grains in the billet prior to extrusion.
A shear-assisted extrusion process for forming products of a desired composition from billets of a magnesium alloy comprising the steps of:
- simultaneously applying a rotational shearing force and an axial extrusion force to the same location on the billet with a scroll face of an extrusion die in the form of a spiral that surrounds an extrusion orifice arranged in a center of the extrusion die, the scroll face configured to spin with respect to the billet to plasticize billet material from the billet while extruding the plasticized billet material through the orifice of the extrusion die forming an extrusion product whereby microstructure grains in the extrusion product are one-half the size of microstructure grains in the billet prior to extrusion.
Dependencies are inferred from the claim text.