Method for piercing two aligned holes in a hydroformed tube

Details Method for piercing two aligned holes in a hydroformed tube Method for piercing two aligned holes in a hydroformed tube

1996-06-13

1997-09-16

Jones, David

Metal deforming

By application of fluent medium, or energy field

With cutting

83 53, 72336, B21D 2828

Patent

active

056668406

ABSTRACT:
A method and apparatus for piercing a pair of aligned holes through both sides of a tube combined with the process of hydroforming the tube to final shape. After the tube is expanded and internally pressurized between upper and lower dies, a punch is driven forcefully through a cross passage in the die and through both walls of the tube, one after the other. The end of the punch is bored out sufficiently to leave a sharp edge that cuts a first slug, and the first slug is wedged into the end of the punch. The opposed wall of the tube is backed by a female die button with a cylindrical cutting edge concentric to, and equal in diameter to, the end of the punch. The end of the punch enters the die button to cleanly shear out a second hole, pushing a stack of two slugs into the die button. A pressure feed orifice properly located enters the still pressurized tube at this point, feeding positive pressure to the punch bore to blow the slugs off and out of the die button.

REFERENCES:
patent: 3487668 (1970-01-01), Fuchs
patent: 3495486 (1970-02-01), Fuchs
patent: 3991456 (1976-11-01), Lieser
patent: 4989482 (1991-02-01), Mason
patent: 5398533 (1995-03-01), Shimanovski et al.
patent: 5460026 (1995-10-01), Schafer

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