US 4,230,661 AGranted

Indirect extrusion process

AssigneeKobe Steel, Ltd.

InventorsAkira Asari, Masakazu Ueda, Takeo Nishimoto

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Abstract

An indirect extrusion process making use of an apparatus having a main ram and a container which are adapted to be driven independently of each other, the container being moved during the extrusion at a speed equal to or higher than that of the main ram, so as to produce the extrusion force, characterized in that the movement of the container relative to the main ram is prevented so that the power for moving the container may be added to the extrusion force, so as to effect extrusion without causing change in the relative position between the container and the billet during extrusion, and that the main ram and the container are connected at a desired position in accordance with the length of the billet, making use of the frictional force exerted between the container and said billet, such that extrusion may be effected with respect to container and the billet in connected state of operation.

Claims4

Dependent claims

An indirect hot extrusion process with an extrusion apparatus having a die member operatively associated with a main ram and a container which are adapted to be driven independently of each other, said container being moved during extrusion at a speed equal to or greater than that of said main ram, so as to produce an extrusion force on a billet mounted in said container for cooperation with said die member comprising:

loading said billet in said container;
extruding said billet at least partially through said die member;
and
preventing movement of said container relative to said main ram and adding power for moving the container to the extrusion force so as to effect the extrusion without causing change in the relative position in accordance with the length of said billet by use of frictional force exerted between said container and said billet, so that the extrusion may be effected with respect to said container and said billet in a connected state of operation.

1 more element

Dependencies are inferred from the claim text.