Die assembly and methods for friction stir extrusion
AssigneeOhio State Innovation Foundation
InventorRajiv Shivpuri
Life of this patent
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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.
Claims20
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.
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.
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.
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.
Dependencies are inferred from the claim text.