Apparatus for continuous extrusion of metals

Claim 1

An apparatus for the continuous extrusion of metal wherein the surface parts of the metal to be extruded do not substantially form surface parts of the extruded metal product, comprising: a channel having a feed end for accepting metal to be extruded, defined by a first movable member having a continuous groove and a second stationary member partially overlying the length of said groove, one wall of said channel being continuously movable with respect to another wall of said channel to feed metal supplied to said channel along said channel by friction with the generation of heat sufficient to convert said metal to a viscous fluid state, said channel being substantially closed at the end opposite the feed end, said channel including an extrusion opening in the stationary member; a space wider than said extrusion opening in fluid communication with said extrusion opening; a through-flow shaping die adjoined to said space, metal passing from said space to said through-flow die, and an extrusion passage having a central flow axis providing fluid communication between said extrusion opening and said space, having a first and second portion, said first portion of said extrusion passage having first and second ends and substantially parallel walls of a length at least equal to the transverse dimension of said extrusion passage, said second portion of said extrusion passage having first and second ends and a wall which gradually flares outwardly in a direction from said first end of said second portion of the extrusion passage to said second end of said second portion of the extrusion passage; said first end of said first portion cooperating with said extrusion opening, said second end of said first portion cooperating with said first end of said second portion and said second end of said second portion cooperating with said space so that said extrusion passage provides fluid communication between said extrusion opening and said space so that the metal in a viscous fluid state flows sequentially through said extrusion opening along said first portion of said extrusion passage, and along said second portion into said space; said space having a central flow axis for said metal substantially in line with the central flow axis of said extrusion passage.

Claim 2

An apparatus for the continuous extrusion of metal wherein the surface parts of the metal to be extruded do not substantially form surface parts of the extruded metal product, comprising: a channel having a feed end for accepting metal to be extruded, defined by a first movable member having a continuous groove and a second stationary member partially overlying the length of said groove, one wall of said channel being continuously movable with respect to another wall of said channel to feed metal supplied to said channel along said channel by friction with the generation of heat sufficient to convert said metal to a viscous fluid state, said channel being substantially closed at the end opposite the feed end, said channel including an extrusion opening in the stationary member; a space wider than said extrusion opening in fluid communication with said extrusion opening; a through-flow shaping die adjoined to said space, metal passing from said space to said through-flow die, and an extrusion passage having a central flow axis providing fluid communication between said extrusion opening and said space, having a first and second portion, said first portion of said extrusion passage having first and second ends and substantially parallel walls of a length at least equal to the transverse dimension of said extrusion passage, said second portion of said extrusion passage having first and second ends and a wall which gradually flares outwardly in a direction from said first end of said second portion of the extrusion passage to said second end of said second portion of the extrusion passage; said first end of said first portion cooperating with said extrusion opening, said second end of said first portion cooperating with said first end of said second portion and said second end of said second portion cooperating with said space so that said extrusion passage provides fluid communication between said extrusion opening and said space so that the metal in a viscous fluid state flows sequentially through said extrusion opening along said first portion of said extrusion passage, and along said second portion into said space; said space having a central flow axis for said metal substantially in line with the central flow axis of said extrusion passage.