Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1990-04-12
1991-06-11
Combs, E. Michael
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
72 58, 72 62, B21D 2602, B21D 3908, B23P 1700
Patent
active
050221353
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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Miller Donald E.
Virsik Milan A.
Brazeway, Inc.
Combs E. Michael
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