Patent ID: 9375770
Filing Date: 2016-06-28
CPC Classification: B21C,B29C

Claim Text:
1. An asymmetric extrusion method, the method comprising: forming a sheet by pushing an extruding material through a die while inducing shear strain in the extruding material, the die comprising an extrusion hole including a fixed part and a tapered part, the tapered part having an asymmetric shape with respect to an extrusion direction of the extruding material, wherein the extruding material is a metal or metal alloy, and wherein the fixed part and the tapered part have a common lower surface, wherein the sheet is formed by pushing the extruding material through an inner hole, the inner hole being connected to a first end of the tapered part, a surface of the inner hole being coplanar with the common lower surface, and wherein a second end of the tapered part is connected to the fixed part.