Method and apparatus for extrusion
OwnerAlfred Robertson Austeninventor
Life of this patent
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Abstract
Die arrangement for use with conventional and hydrostatic extrusion presses consisting of a first die for providing a first extruded section of a billet and a second die cooperating with the first die to further extrude said first extruded section to final shape. Successive dies beyond the second die are contemplated to provide successive step-wise extrusion for greater reductions, especially of large billets. The method of the invention comprises step-wise incremental sequential extrusion of the billet and extruded portions of the billet until the final shape is achieved.
Claims14
In a hydrostatic extrusion press of the type wherein a fluid is pressurized around a billet to extrude the billet through a die opening having an inlet opening and a smaller outlet opening with a deformation zone therebetween to produce an elongated-shaped article defined by the die outlet opening, the improvement which comprises in combination:
- a cylinder for mounting in the extrusion press in place of the conventional cylinder and die;
- the cylinder having a first section suitable for receiving a billet to be extruded and a supply of extrusion fluid, the first section terminating in a first die having an outlet with a cross-section smaller than that of the first section;
- a second section in the cylinder for receiving the primary extrusion product of a billet extruded through said primary die;
- a second die having a bore therethrough and slidably mounted within said second section, the second die having a die inlet on one end thereof, the die inlet on the second die disposed adjacent the primary die outlet to receive the primary extrusion product;
- and
- means for moving said second die, having an outlet cross-section smaller than that of the primary extrusion, against said primary extrusion product to effect a secondary extrusion thereon.
Dependencies are inferred from the claim text.