Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1999-06-09
2000-11-07
Butler, Rodney A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
B21B 1904
Patent
active
061420018
ABSTRACT:
A method of producing a cylindrical shell in which a billet of circular, transverse cross-section is provided with of first and second sections formed of steel and a liner insert material, respectively. The first section has an end portion and a recess defined within the end portion. The second section is shaped to nest within the recess of the end portion of the first section. The billet is extruded into a cylindrical shell by a billet piercing operation so that the first section produces an outer cylindrical form and the second section produces a liner insert for the cylindrical form. The recess and therefore the second section (forming the liner insert) can be a frustum of a cone. The material for the liner insert may be a corrosion resistant nickel or nickel alloy, Hastalloy C-22, tantalum, titanium, gold or platinum.
REFERENCES:
patent: 2349570 (1944-05-01), Witter
patent: 2791924 (1957-05-01), Sawyer
patent: 5778714 (1998-07-01), Katsumura et al.
patent: 5964117 (1999-10-01), Holroyd et al.
Butler Rodney A.
Pace Salvatore P.
The BOC Group Inc.
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