Die assembly for extruding hollow articles

Details Die assembly for extruding hollow articles Die assembly for extruding hollow articles

1997-02-26

1998-11-10

Larson, Lowell A.

Metal deforming

By extruding through orifice

Utilizing internal forming means

72261, B21C 2504

Patent

active

058327681

ABSTRACT:
A male die (2) is composed of an annular base (7), a bridge (8) and a forming lug (9), and a female die (3) tightly fits in the annular base (7) of the corresponding male die (2). A distance between a forming slit (28) and a location where the male die (2) engages with the female die (3) is decreased such that the misalignment of the forming lug (9) with a forming hole (26) is prevented from occurring during an extrusion process. The male die in combination of the female die enables the production of hollow articles of a high dimensional precision free of any unevenness in wall thickness.

REFERENCES:
patent: 2651411 (1953-09-01), Bennett
patent: 2811253 (1957-10-01), Schieren
patent: 4697325 (1987-10-01), Kamigaito et al.
patent: 5131253 (1992-07-01), Hopkins
Patent Abstracts of Japan, vol. 17, No. 365, (M-1422), Jul. 9, 1993 of JP 5057337 (Showa Alum. Corp.), Mar. 9, 1993.

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