Abstract: An indirect extrusion press including a die assembly having a loose die detachably mounted on a die stem and axially movable relative to a billet container for extruding a billet through a die hole, and a die handling mechanism for transferring the die assembly between the press center and a position outside the press machine, the indirect extrusion press including a reduced diameter portion provided in the rear end portion of the die stem and defining a stepped wall portion; a loose die detachably mounted on the end face of the reduced diameter portion; and a detachable cleaning ring loosely fitted on the reduced diameter portion of the die stem in abutting engagement with the stepped wall portion and in axially spaced relation with the loose die, the cleaning ring being in sliding engagement with the inner periphery of the billet container in the extruding phase of the press operation to remove container shells.

Abstract: A billet scalper including a die assembly with a scalping die, a pressing mechanism with a stem member in axial alignment with the scalping die for pressing a billet thereinto, and a chip ejector located around the circumference of the scalping die and movable axially back and forth beyond a free end face of the scalping die to remove chips therefrom. The die assembly including the scalping die is movable between a position at the center of the scalper and an outer receded position to permit easy maintenance and service of the die assembly including replacements and cleaning of scalping dies. In a preferred form, the scalper is constructed integrally with an extrusion press to perform the billet scalping operation in timed relation with the extruding operation to shorten the time of press cycle.

Abstract: A method for cleaning inner surfaces of a container on an indirect extrusion press, using a loose die including an extruding die portion and a separable cleaning die portion. The die is continuously used after contributing to the cleaning in each cycle of press operation, replacing the cleaning die portion alone in an ejected position after extrusion of a billet.

Abstract: A pull-back type indirect extrusion press is designed so that the scalping of billets can be effected inside the press independently of extrusion cycles and the scalped billet is allowed to stand by in a billet extrusion standby space which is provided with a heating element to heat the standby billet to maintain the same at a required temperature and into which a billet oxidation-preventive gas is admitted to prevent oxidation of the standby billet.

Abstract: A die stem for an extrusion press connected at its one end to a die holder including a first connecting construction such as a screw or a bayonet provided in the inner bore of the end portion of a sleeve received by the inner bore of the die stem, and a second connecting construction such as a screw or a bayonet provided at the rear end projection of the die holder, the second connecting construction being adapted to cooperate with the first connecting construction, whereby the compression stress at the connecting portion thereof due to the extrusion force is prevented from taking place.