Making contoured hollows

Details Making contoured hollows Making contoured hollows

1980-09-03

1982-03-02

Gilden, Leon

Metal deforming

By application of fluent medium, or energy field

Using fixed die

72 58, B21D 2210

Patent

active

043173489

ABSTRACT:
A hollow blank, such as a tube, is inserted in between two dies and is also received by two retractable die members. The interior of the blank is closed off, but working fluid is admitted to widen the blank. Widening is at first restricted to a central portion established by conical front faces of the die members. These members are retracted while continued application of fluid pressure progressively widens the blank, urging blank material into continued abutment with the front faces of the receding die members.

REFERENCES:
patent: 3564886 (1971-02-01), Nakamara
patent: 3832877 (1974-09-01), Tominaga
patent: 3858422 (1975-01-01), Tominaga
patent: 3979936 (1976-09-01), Ludwig
patent: 4179910 (1979-12-01), Mazier

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