| 摘要 |
A metallic die for extruding a metal material, preferably a material of Al or alloys thereof, and/or of nonferrous metals, particularly Cu or alloys thereof, has an essentially flat, disc-shaped die body with at least one aperture, and a second aperture segment which adjoins a first aperture segment. The first aperture segment corresponds to and gives the final form to the desired cross section of the extrusion, and the second aperture segment is at least coincident with the first in its extent transversely to the pressing direction, and is preferably everywhere wider than the first aperture segment. The die body has at least two die parts which adjoin each other at a surface which is preferably generally flat and extends transversely to the press direction. The die parts are of different metallic materials, the first die part having an aperture segment which at least covers the cross section of the entire opening which accomplishes the final forming, and the second die part has an aperture segment which generally adjoins that of the first and preferably has a release clearance. The die part having the aperture segment which produces the final form is of a material with high wear-resistance and hot strength, preferably a high alloy hot-work steel, a high speed tool steel, or a superalloy, particularly an alloy based on Co-, Ni-, or Mo, and the die part with the release clearance is comprised of a tough, nonductile, heat-resistant steel, preferably a medium alloy hot-work steel, and wherein the die parts are bonded together over the surface (23) by a pure metal-to-metal bond of the type of the metals themselves to form a single unit die body. |
