Method and apparatus for forming and cutting tubing

Details Method and apparatus for forming and cutting tubing Method and apparatus for forming and cutting tubing

1994-08-10

1995-08-29

Jones, David

Metal deforming

By application of fluent medium, or energy field

With cutting

219 68, B21D 2602

Patent

active

054450012

ABSTRACT:
A novel method of cutting a complexly shaped end edge of a tube is incorporated into the apparatus for forming the tube to shape. Hydroforming dies are provided with a pair of sharp ribs which, simultaneously with the pressurized expansion of the tube out into the die cavities, cut a groove into the surface of the tube. The groove matches the shape of the cut end edge desired, and locally increases the electrical resistance of the tube at the groove, but does not cut all the way through the tube wall. Then, a high electrical current is applies to the tube to either side of the groove, which selectively heats and melts the tube at the higher resistance grooved area.

REFERENCES:
patent: 2851580 (1958-09-01), Taylor
patent: 3035148 (1962-05-01), Oakley
patent: 3567088 (1971-03-01), Anderson
patent: 3597569 (1971-08-01), Gerber
patent: 3786662 (1974-01-01), Roth
patent: 5133492 (1992-07-01), Wohrstein
patent: 5201117 (1993-04-01), Wright
patent: 5233856 (1993-08-01), Shimanovski et al.

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