Extruder and method of extrusion
AssigneeKlil Industries Ltd.
InventorsEphraim Hirsch, Itamar Ohayon
Life of this patent
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Abstract
An extruder includes a container having a main bore for receiving billets, a die and a piston. The container is formed with at least one gas release vent opening into the main bore at a position intermediate between the extruding end of the bore and a midpoint of the bore's length. Each gas release vent has a valve for allowing selective release of trapped gas. This structure allows venting of gases in such a manner as to allow sequential loading of billets without removal of scrap between them.
Claims18
An extruder comprising:
- (a) a container having a main bore for receiving billets, said main bore having a loading end and an extruding end separated by a length;
- (b) at least one die associated with said extruding end of said main bore;
- and
- (c) a piston deployed for forcing a billet along said main bore towards said extruding end, wherein said container is formed with at least one gas release vent opening into said main bore at a position intermediate between said extruding end and a midpoint of said length, each of said gas release vents being provided with a valve deployable between an open state for allowing release of trapped gas and a closed state for preventing penetration of material from the billets into said at least one gas release vent.
A method of producing an extruded profile using an extruder including a container with a main bore, the main bore having a loading end and an extruding end separated by a length, the container being formed with at least one selectively openable gas release vent opening into the main bore at a position intermediate between the extruding end and a midpoint of the length, the method comprising:
- (a) introducing into the main bore a first billet;
- (b) forcing the first billet towards the extruding end so as to force material from the billet through a die associated with the extruding end of the bore;
- (c) while material from the first billet remains within the main bore, introducing a second billet into the main bore;
- (d) pressing the second billet towards the material from the first billet so as to cause joining of the material from the first billet and the second billet;
- (e) opening the at least one gas release vent so as to release gas trapped within the main bore;
- and
- (f) forcing the second billet towards the extruding end so as to force material from both the first and second billets through the die.
Dependencies are inferred from the claim text.