Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1990-01-30
1990-08-14
Jones, David
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
72430, 72707, 294192, B21D 2614
Patent
active
049476670
ABSTRACT:
This invention provides a method for expanding at least a portion of a cylindrical sidewall of a generally cylindrically shaped, electrically responsive, metallic body. This method comprises the steps of retaining at least a first portion of the metallic body, disposing a coil of electrically conductive material inside the metallic body, and energizing the coil to create an electromagnetic force sufficient to expand at least a portion of the generally cylindrical sidewalls of the metallic body outwardly of the original generally cylindrical shape. During such expansion, a fluid is introduced between the coil and the inside surfaces of the container to maintain positive gauge pressure as the sidewalls expand. This invention also provides an apparatus for expanding at least a portion of a cylindrical sidewall of a generally cylindrically shaped, electrically responsive, metallic body. The apparatus comprises a retaining mechanism for holding the metallic body, a coil of electrically conductive material, structure for disposing the coil inside the metallic body, and structure for energizing the coil sufficient to expand at least a portion of the sidewall of the metallic body. Means for maintaining positive gauge pressure during expansion is also included in the apparatus.
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Cargnel Robert A.
Gunkel Ronald W.
Morran James R.
Patrick Edward P.
Aluminum Company of America
Jones David
O'Rourke, Jr. William J.
Strickland Elroy
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