Metal extrusion process with high reduction
AssigneeNippon Steel Corporation
InventorsSamon Yanagimoto, Koshiro Aoyagi, Susumu Mizunuma, Kouki Nambu
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Abstract
A metal extrusion process with high reduction wherein a metal blank is extruded from a container through an opening which is formed by a plurality of work rolls. The metal blank is guided to the opening from the outlet of the container by causing the metal blank to adapt to the shape of the opening by means of a forming die so that the metal blank does not overfill the opening. This extrusion process is capable of forming the metal blank into a product having the desired cross section with high elongation in one pass and also the radius of curvature of the corner portion of the product can be freely adjusted.
Claims6
A metal extrusion process for producing a shaped steel product having a sharply angled corner portion by high reduction of a workpiece, comprising:
- disposing a plurality of work rolls to form a completely enclosed rotary die;
- disposing a forming die at said rotary die, said forming die having an inlet with a cross-sectional shape the same as the cross-sectional shape of the workpiece to be extruded and tapering from said inlet and to said rotary die and having portions which fill the gaps between end portions of said work rolls on the input side of said rotary die;
- feeding a metal workpiece which is at a rolling temperature into a guide container means connected to the forming die and having the cross-sectional shape of the workpiece to be extruded;
- and
- exerting a force on the workpiece for urging it through said guide container means toward said rotary die and through said die and driving said rolls for extruding the metal workpiece continuously through the rotary die.
Dependencies are inferred from the claim text.