Rapid extrusion of hot-short-sensitive alloys

Details Rapid extrusion of hot-short-sensitive alloys Rapid extrusion of hot-short-sensitive alloys

1981-06-01

1984-07-31

Larson, Lowell A.

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

722531, 72264, 722735, 72342, 72700, B21C 2308, B21C 2332, B21C 2502, B21C 2904

Patent

active

044622341

ABSTRACT:
High-strength aluminum alloys and other hot-short-sensitive alloys can be extruded at rapid rates through a cooled, double reduction die (3) without hot-short cracking or scoring caused by die pickup. A primary reduction die (4) has a long, cooled primary land (5) and is followed by a secondary reduction die (6). A metal billet (15) may be extruded through the primary die (4) at about the solidus temperature of its lowest melting phase, then cooled as it passes through the primary die land (5) to reduce or maintain the temperature below the solidus temperature and, finally, the primary extrusion is reduced in cross section in the secondary die (6) by about 2-50%. The temperature, the back pressure caused by the second reduction, and the low friction through the primary land (5) contribute to eliminate hot-short cracks and minimize serious pickup scoring at surprising rates of at least about 18 meters per minute (60 ft/min) for 2024 aluminum rod.

REFERENCES:
patent: 2135193 (1938-11-01), Moorhead
patent: 2907454 (1959-10-01), Sejournet
patent: 3112828 (1963-12-01), Zipf
patent: 3344636 (1967-10-01), Pugh
patent: 3364707 (1968-01-01), Foerster
patent: 3553996 (1971-01-01), Sabroff et al.
patent: 3808865 (1974-05-01), Wagner et al.
patent: 3999415 (1976-12-01), Austen
patent: 4346578 (1982-08-01), Harrison et al.
The Extrusion of Metals, by Pearson & Parkins, 2nd ed., 1960; pp. 112-117, 162-169, 190-199, 242-253.

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