Apparatus and method for forming a tube with a tetragonal...

Details Apparatus and method for forming a tube with a tetragonal... Apparatus and method for forming a tube with a tetragonal...

2008-02-20

2011-11-01

Sullivan, Debra (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S359000, C072S354600, C072S370100

Reexamination Certificate

active

08047045

ABSTRACT:
An apparatus for cold-forming a workpiece having a substantially round cross-section and an elongate body into a tube having a main portion with a substantially tetragonal cross-section and a reinforced end. The apparatus includes a die in which a received portion of the body of the workpiece is receivable and from which a preselected portion of the body extends, and a first punch adapted to bend the preselected portion radially outwardly to form a curled end. The apparatus also includes a second punch to form the curled end into a round reinforced end, and a die subassembly for forming the received portion of the body of the workpiece into the main portion of the tube having the substantially tetragonal cross-section and for forming the round reinforced end into the reinforced end of the tube.

REFERENCES:
patent: 1966053 (1934-07-01), Squires
patent: 6408672 (2002-06-01), Roe et al.
patent: 6931906 (2005-08-01), Sorgi

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