Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1996-10-02
1997-09-09
Larson, Lowell A.
Metal deforming
By extruding through orifice
Utilizing internal forming means
72467, 72700, B21C 2502
Patent
active
056644531
ABSTRACT:
A hollow extruding die for extruding a hollow section of a zinc-containing aluminum alloy is provided. The die is protected from cracks and has an extended life, without requiring any substantial structural changes to the die. In the die mandrel of the die a mandrel is connected by bridges with an outer cylindrical member. The bridges have a tapered projection facing toward the mandrel. A 3 mm thick coating composed of a nickel alloy is bonded on the surface of the projection by padding the welding material. Instead of coating the bridges, a covering can be attached to the surface of the bridges. To receive the covering, an engaging groove extends from the root of the mandrel and along the surface of the bridges to the outer cylindrical member of the die mandrel. The covering is composed of the same steel material as that of the die or of the nickel alloy. The covering has a through hole for receiving the mandrel formed on the base. At the opposite sides of the through hole, the covering has projecting portions that are disposed parallel to the mandrel and the covering is tapered along the bridges.
REFERENCES:
patent: 3230759 (1966-01-01), Schoenfeld et al.
patent: 4773251 (1988-09-01), Kohnhauser et al.
Abo Mitsuo
Kumazaki Hidenori
Sato Fumihiko
Tanaka Yasuyuki
Wakabayashi Hiroyuki
Larson Lowell A.
Sumitomo Light Metal Industries Ltd.
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