Method for expanding tubular blanks

Details Method for expanding tubular blanks Method for expanding tubular blanks

1983-01-26

1983-11-15

Gilden, Leon

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

29421R, 72 62, B21D 2604

Patent

active

044148348

ABSTRACT:
A method and apparatus for expanding a tubular workpiece which includes mounting the workpiece in a lower die, filling the workpiece with fluid and engaging the upper portion of the workpiece with an upper die. The upper die is moved downwardly acting to physically compress the workpiece. The dies are additionally configured to form an internal pressure cavity such that further downward displacement of the upper die creates an internal pressure forcing the workpiece outwardly into the desired end configuration.

REFERENCES:
patent: 3335590 (1967-08-01), Early
patent: 3564886 (1971-02-01), Nakamura
patent: 3585828 (1971-06-01), Roper
patent: 3675457 (1972-07-01), Marsch
patent: 3681960 (1972-08-01), Tadokoro
patent: 3706213 (1972-12-01), Nakamura
patent: 4062215 (1977-12-01), Roper
patent: 4173136 (1979-11-01), Schroth

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