Process for the production of tubular structural parts...

Details Process for the production of tubular structural parts... Process for the production of tubular structural parts...

2006-03-07

2006-03-07

Jones, David (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

C072S056000

Reexamination Certificate

active

07007532

ABSTRACT:
A process for the production of tubular structural parts fabricated from PGM materials and having circumferential undulating bulges by forming from smooth-walled tube pieces. A smooth-walled tube piece (1) is inserted into a cylindrical forming die (2) with an internal diameter that corresponds substantially to the external diameter of the tube piece and that has radial undulating recesses (3). This die is provided at both axial ends with a press tool (4,5) that tightly seals the tube ends. The space that is thus formed is completely filled with an hydraulic fluid (6), and an hydraulic internal pressure is then produced by exerting an axial compression via the press tools (4,5) in such a way that under simultaneous shortening of the tube piece bulges (7) are formed in the wall of the latter that correspond to the recesses (3) of the forming die (2).

REFERENCES:
patent: 349718 (1886-09-01), Hollerith
patent: 1823532 (1931-09-01), Clifford
patent: 2183304 (1939-12-01), Davis
patent: 2919740 (1960-01-01), Poitras
patent: 3015354 (1962-01-01), Wood
patent: 3103244 (1963-09-01), Schindler et al.
patent: 3625040 (1971-12-01), De Gain
patent: 3704983 (1972-12-01), Tellot
patent: 17 77 181 (1971-03-01), None
Copy of German Office Action (German language) in counterpart appln. No. 100 51 946.6-14, dated Mar. 12, 2001.

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