Hollow article internal pressure forming apparatus and method

Details Hollow article internal pressure forming apparatus and method Hollow article internal pressure forming apparatus and method

1980-10-24

1982-12-07

Gilden, Leon

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 62, 72345, B26D 2602

Patent

active

043620370

ABSTRACT:
An upper die is movable by a ram downwardly against a lower die with the dies enclosing a hollow article such as a knobshell in die cavities thereof. RAM continued downward movement of the closed dies forces a piston connected to the lower die downwardly against hydraulic fluid of a containing cylinder forcing the hydraulic fluid internally of the knobshell through the neck thereof forming the knobshell outwardly against the die cavity surfaces. The piston size compared to the knobshell size automatically creates a reactive force reversely tending to maintain the dies closed greater than the internal knobshell forming force tending to separate the dies. After knobshell forming, reverse ram movement first relieves piston pressure against the hydraulic fluid and ultimately separates the dies with a knockout member being actuated to eject the formed knobshell. During forming, an automatic pressure relief valve maintains maximum hydraulic fluid pressure not exceeding a predetermined maximum pressure and an automatic fluid refill valve refills the cylinder with hydraulic fluid at separation of the dies for formed knobshell removal.

REFERENCES:
patent: 788119 (1905-04-01), Pope
patent: 795019 (1905-07-01), Barthelmes
patent: 1753680 (1930-04-01), Batie
patent: 2688297 (1954-09-01), Livermont et al.
patent: 3040684 (1962-06-01), Hillgren
patent: 3748887 (1973-07-01), Widesu
patent: 3919871 (1975-11-01), Andrasev
patent: 4265102 (1981-05-01), Shimakata

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