Apparatus for the continuous extrusion of electrically conductive granulated materials, preferably powder metallurgy materials
AssigneeGlacier GmbH-Deva Werke
InventorKlaus Lichtinghagen
Life of this patent
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Abstract
A process for the continuous extrusion of electrically conductive granulated materials, preferably powder metallurgy mateials, wherein the material is introduced into a duct of a die and is compressed and moved along the duct to and through a nozzle on the die by a punch movable in the duct, the material being sintered by heating it with electrical current passed therethrough via electrical connections made with the punch and nozzle.
Claims11
A process for the continuous extrusion of electrically conductive granulated material, preferably powder metallurgy material, into a strand utilizing a die having a die passage duct, a nozzle, and a punch, which comprises:
- introducing said material into said die;
- compressing said material with a plurality of compression strokes of said punch in said die passage duct against a frictional resistance which is built up by successive strokes of said punch to form a precompressed section of said strand;
- introducing an additional quantity of said material into said die between each of said plurality of compression strokes;
- advancing said material by the pressure of said plurality of compression strokes in said duct;
- extruding said material through said nozzle;
- sintering said material by means of a current directed through the longitudinal direction of said strand to heat all said material situated in said die passage duct between said punch and said nozzle;
- and
- applying a voltage from 2 to 5 volts exclusively to said material with said nozzle and said punch so as to produce said current directed through said strand situated in said die passage duct.
A process for the continuous extrusion of electrically conductive granulated material, preferably powder metallurgy material, into a strand utilizing a die having a die passage duct, a nozzle, and a punch, which comprises:
- introducing said material into said die;
- compressing said material with a plurality of compression strokes of said punch in said die passage duct against a frictional resistance which is built up by successive strokes of said punch to form a precompressed section of said strand;
- introducing an additional quantity of said material into said die between each of said plurality of compression strokes;
- advancing said material by the pressure of said plurality of compression strokes in said duct;
- extruding said material through said nozzle;
- sintering said material by means of a current directed through the longitudinal direction of said strand to heat all said material situated in said die passage duct between said punch and said nozzle;
- and
- applying a voltage from 2 to 5 volts exclusively to said material with said nozzle and said punch so as to produce said current directed though said strand situated in said die passage duct during each of said plurality of compression strokes only when said punch has already covered half of each of said plurality of compression strokes.
Dependencies are inferred from the claim text.