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An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the c

An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the container so that the billet is sandwiched between the die and pressure disc, with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container. A bolster is located adjacent the pressure disc and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster exerts a relatively insigificant axial force against the container. An elongated stem having an axial passage is moved into the throughbore of the container to press the die toward the bolster, causing the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.

대표청구항 ▼

An indirect extrusion process for producing an extrusion product from a hot metal billet in a press having an extrusion axis, comprising: providing a multiple container press turret having a plurality of press containers mounted about an axis of rotation of the press turret, and with the press conta

An indirect extrusion process for producing an extrusion product from a hot metal billet in a press having an extrusion axis, comprising: providing a multiple container press turret having a plurality of press containers mounted about an axis of rotation of the press turret, and with the press containers each having an axial throughbore and being mounted on the press turret to be substantially axially stationary during extrusion of a biIlet; mounting the pressure turret to be substantially axially stationary and rotatable about said axis of rotation for sequentially rotating the press containers, respectively, from a loading station off of the extrusion axis to an extrusion station in which the press container is coaxially aligned with the extrusion axis; loading a die, a hot billet and a pressure disc into the axial throughbore of a container while such container is in the loading station so that the billet is sandwiched between the die and the pressure disc, with the die having an opening through which the billet is to be extruded to form an extrusion product and with the pressure disc having opposite radial faces and a maximum outer diameter between such faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container; rotating the turret to bring the loaded container into the extrusion station; at the extrusion station, locating a bolster adjacent the radial face of the pressure disc which is remote from the billet and axially fixing the bolster to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion and so that the bolster exerts a relatively insignificant axial force against the container; and pressing an elongated stem having an axial passage into the throughbore of the container and against the die to press the die toward the bolster to cause the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.