Systems, devices, and methods are described for extruding materials. In certain embodiments, one or more hollow billets are loaded onto an elongate mandrel bar and transported along the mandrel bar to a rotating die. The billets are transported through fluid clamps, which engage the mandrel bar and provide cooling fluid to the mandrel bar tip, and through mandrel grips, which engage the mandrel bar and prevent the mandrel bar from rotating. One or more press-rams advance the billets through a centering insert and into the rotating die. A quench assembly is provided at an extrusion end of the extrusion press to quench the extruded material. A programmable logic controller may be provided to control, at least in part, operations of the extrusion press system.

A die assembly includes an inflow end, an outflow end opposite the inflow end, and an internal cavity extending from the inflow end to the outflow end. The die assembly also includes an internal mandrel disposed within the internal cavity. The internal mandrel has an end proximate to the outflow end of the die assembly. The die assembly also includes an internal cooling channel within the internal mandrel. The internal cooling channel has an outlet at or near the end of the internal mandrel.

A die assembly includes an inflow end, an outflow end opposite the inflow end, and an internal cavity extending from the inflow end to the outflow end. The die assembly also includes an internal mandrel disposed within the internal cavity. The internal mandrel has an end proximate to the outflow end of the die assembly. The die assembly also includes an internal cooling channel within the internal mandrel. The internal cooling channel has an outlet at or near the end of the internal mandrel.

An extrusion method for forming a length of multimaterial extrudate includes providing a die; providing a container comprising a multimaterial feed material supply; effecting relative movement of the container towards the die so as to bring an axial surface of the die into contact with a rotating engagement surface of the supply of feed material; generating heat at the interface between the axial surface of the die and the rotating engagement surface of the multimaterial feed material supply so as to heat the at least two materials of the multimaterial feed material supply by the application of a contact pressure between the axial surface of the die and the rotating engagement surface of the feed material supply; pressing the heated multimaterial feed material supply through an orifice in the axial surface of the die so as to form a length of multimaterial extrudate in the extrusion channel.

An extrusion method for forming a length of multimaterial extrudate includes providing a die; providing a container comprising a multimaterial feed material supply; effecting relative movement of the container towards the die so as to bring an axial surface of the die into contact with a rotating engagement surface of the supply of feed material; generating heat at the interface between the axial surface of the die and the rotating engagement surface of the multimaterial feed material supply so as to heat the at least two materials of the multimaterial feed material supply by the application of a contact pressure between the axial surface of the die and the rotating engagement surface of the feed material supply; pressing the heated multimaterial feed material supply through an orifice in the axial surface of the die so as to form a length of multimaterial extrudate in the extrusion channel.