Tube expanding method and apparatus of damper tube

Details Tube expanding method and apparatus of damper tube Tube expanding method and apparatus of damper tube

2011-05-24

2011-05-24

Tolan, Edward (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S370010, C072S370060, C072S393000

Reexamination Certificate

active

07946147

ABSTRACT:
In a tube expanding apparatus of a damper tube supporting a thrust force of a punch applied to the damper tube by a stopper at a time of retaining one end of the damper tube by the stopper, inserting the other end of the damper tube to a die, inserting the punch to the other end of the damper tube so as to propel, and expand the other end of the damper tube while carrying out an ironing operation, the apparatus is provided with a stopper releasing means for releasing the stopper at a time when a load in an axial direction applied to the damper tube due to an elongation by the ironing work of the damper tube increases over a critical load which is previously determined to be a smaller load than an expected buckling load in the damper tube.

REFERENCES:
patent: 2726704 (1955-12-01), Fischer
patent: 3585701 (1971-06-01), Stary
patent: 4297867 (1981-11-01), Masaki et al.
patent: 5752313 (1998-05-01), Gaffaney et al.
patent: 6360415 (2002-03-01), Wada et al.
patent: 61-56746 (1986-03-01), None
patent: HEI 6-328176 (1994-11-01), None

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