Method of manufacturing a fluid conduit having exterior detail
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United States of America Patent
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Jun 11, 1991
Issued Date -
N/A
app pub date -
Apr 12, 1990
filing date -
Dec 7, 1987
priority date (Note) -
Expired
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Abstract
A method for fabricating metallic conduit and the like having exterior surface details such as beads, bulges and flares by inelastic flow of the metal of an extruded blank which does not exhibit the detail. The process comprises the steps of placing a blank in a high pressure die, injecting oil or other incompressible pressure-transmitting fluid into the blank, and using advancing core punches, pressurizing the fluid to cause the metal of the blank to flow into detail cavities of the die.
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