Die assembly for extruding hollow articles

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

1995-02-27

1996-11-05

Larson, Lowell A.

Metal deforming

By extruding through orifice

Utilizing internal forming means

29447, B21C 2504

Patent

active

055712355

ABSTRACT:
A die assembly has at least one core (7), a male die supporter (8) and at least one female member (5). The male die supporter is composed of an annular base (15), a core holder (16) and bridges (17) formed integral with the annular base and the core holder. Each core (7) is shrinkage-fitted in and integral with a cylindrical recess (21) formed in the core holder. The die assembly further has a die retaining mechanism such that the pressure of the material being extruded causes a latchable member to engage with a latching member. Each female member (5) is shrinkage-fitted in and integral with the annular base (15), so that the die assembly can produce hollow articles free from any unevenness in wall thickness, the abraded portion of this assembly can be renewed inexpensively, and the core is surely protected from slipping off.

REFERENCES:
patent: 4270380 (1981-06-01), Gulati et al.
patent: 4368634 (1983-01-01), Brown et al.
patent: 4697325 (1987-10-01), Kamigaito et al.
patent: 5061163 (1991-10-01), Kennedy
patent: 5131253 (1992-07-01), Hopkins
patent: 5263352 (1993-11-01), Yano

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