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US 12,734,571 B2Granted
Die assembly and methods for friction stir extrusion
AssigneeOhio State Innovation Foundation
InventorRajiv Shivpuri
Life of this patent
Estimating the term…
Abstract
Disclosed herein are devices and methods related to friction stir extrusion. In particular, the present disclosure relates to die assemblies configured for use in a forward friction stir extrusion system and die assemblies configured for use in a backward friction stir extrusion system. The die assemblies in the forward and backward friction stir extrusion systems can include a die piece comprising a sloped surface, wherein at least a portion of the sloped surface is a textured surface.
Claims15
A die assembly configured for use in a forward friction stir extrusion system, the die assembly comprising:
- a die piece comprising:
- a first cylindrical portion having a first radius,
- a second portion having a second radius, the second radius being larger than the first radius, and
- a sloped portion extending from the first cylindrical portion to the second portion, wherein the sloped portion comprises a sloped surface extending from the first radius to the second radius;
- wherein the first cylindrical portion, the second portion, and the sloped portion are each coaxially disposed about a rotational axis;
- and
- wherein at least a portion of the sloped surface is a textured surface;
- and
- an extrusion member defining a substantially cylindrical chamber having an interior wall and an opening;
- wherein the substantially cylindrical chamber is configured to receive the die piece and a feedstock material;
- wherein the extrusion member is configured to move axially relative to the die piece;
- and wherein the feedstock material is configured to be disposed between the die piece and the interior wall of the substantially cylindrical chamber.
9 more elements
A die assembly configured for use in a forward friction stir extrusion system, the die assembly comprising:
- a die piece comprising an interior wall defining a chamber disposed about a rotational axis, wherein the die piece comprises:
- a first end and a second end opposite and axially spaced apart from the first end,
- a first opening having a first radius towards the first end, and
- a second opening having a second radius towards the second end,
- wherein the first radius is larger than the second radius;
- and
- wherein at least a portion of the interior wall defines a sloped surface within the chamber, the sloped surface extending inward from the first radius to the second radius, and wherein at least a portion of the sloped surface is a textured surface;
- and
- a mandrel coaxially disposed about the rotational axis, the mandrel comprising an axially extending cylindrical portion having a third radius and defining a first mandrel surface, wherein the feedstock material is configured to be disposed between the mandrel and the interior wall of the die piece.
6 more elements
A die assembly configured for use in a backward friction stir extrusion system, the die assembly comprising:
- a die piece comprising:
- a first end and a second end opposite and spaced apart from the first end,
- a cylindrical portion disposed towards the first end, and
- a sloped portion disposed proximal to the second end,
- wherein the cylindrical portion and sloped portion are coaxially positioned about a rotational axis,
- wherein the sloped portion defines a sloped surface extending from a first radius towards the first end to a second radius towards the second end,
- wherein the first radius is larger than the second radius, and
- wherein at least a portion of the sloped surface is a textured surface;
- and
- an extrusion member defining a substantially cylindrical housing having an interior wall and an opening;
- wherein the substantially cylindrical housing is configured to receive the die piece and a feedstock material;
- and wherein the feedstock material is configured to be disposed between the die piece and the interior wall of the substantially cylindrical housing,
- wherein the extrusion member is configured to move axially relative to the die piece;
- wherein the die piece and/or the extrusion member is configured to rotate about the rotational axis;
- and wherein rotation of the die piece and/or extrusion member and axial displacement of the extrusion relative to the die piece is configured to cause the feedstock material to extrude through the opening.
12 more elements
A die assembly configured for use in a backward friction stir extrusion system, the die assembly comprising:
- a die piece comprising,
- a first end and a second end opposite and spaced apart from the first end,
- a hollow cylindrical portion disposed towards the first end, and
- a funnel portion disposed proximal to the second end,
- wherein the hollow cylindrical portion and the funnel portion are coaxially disposed about a rotational axis,
- the funnel portion having a first opening having a first radius at the second end and a second opening having a second radius towards the first end,
- wherein the first radius is larger than the second radius,
- wherein the funnel portion defines a sloped surface extending inwards from the first radius at the first opening to the second radius at the second opening;
- and
- wherein at least a portion of the sloped surface is a textured surface;
- and
- an extrusion member having a wall defining a hollow cylindrical housing, wherein the hollow cylindrical housing comprises a container surface that is substantially normal to the rotational axis, wherein the hollow cylindrical housing is configured to receive the funnel portion of the die piece and a feedstock material, and wherein the feedstock material is configured to be disposed between funnel portion of the die piece and the container surface such that rotation of the extrusion member and/or die piece and axial displacement of the funnel portion of the die piece relative to the feedstock material is configured to cause the feedstock material to extrude through the second opening towards the first end.
9 more elements
Dependencies are inferred from the claim text.