Method of and apparatus for the cutting of an opening in a hollo

Details Method of and apparatus for the cutting of an opening in a hollo Method of and apparatus for the cutting of an opening in a hollo

1994-07-01

1995-10-24

Jones, David

Metal deforming

By application of fluent medium, or energy field

With cutting

83 54, B21D 2602, B21D 2818

Patent

active

054600260

ABSTRACT:
In the internal pressure shaping of a tubular workpiece into a hollow body in a surrounding die, an opening can be formed in a wall of the workpiece by advancing a plunger while the maximum internal pressure is maintained to partially cutout a piece of the wall corresponding in shape to the plunger. That piece remains attached by a portion of the thickness of the wall. Their upon the internal pressure is reduced and the plunger is retracted until the cutout portion is pressed fully from the workpiece.

REFERENCES:
patent: 3487668 (1970-01-01), Fuchs, Jr.
patent: 3495486 (1970-02-01), Fuchs, Jr.
patent: 4989482 (1991-02-01), Mason

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