Metal working – Method of mechanical manufacture – Shaping by direct application of fluent pressure
Patent
1996-03-15
2000-07-04
Gorski, Joseph M.
Metal working
Method of mechanical manufacture
Shaping by direct application of fluent pressure
29447, 72 61, 72 58, B21D 2602
Patent
active
060819820
ABSTRACT:
A process for superplastically forming a tube of superplastic material to make a part includes sealing both ends of the tube with end caps to provide a sealed enclosed volume within the tube. At least one of the end caps has a connection that communicates between the enclosed volume and a gas line for connection to a gas management system for controlling forming gas pressure inside the enclosed space. The tube is inserting in a die and the connection is coupled to a gas supply line from said gas management system for supplying forming gas under pressure to said enclosed volume. The die and the tube are heated to the superplastic forming temperature for said material, and gas is introduced from the gas management system for pressurizing the enclosed volume with pressurized forming gas and for expanding the tube against the internal surfaces of the die. After forming the tube, the pressurized forming gas is vented from the enclosed volume, the expanded tube is cooled, and the expanded tube is removed from the die. Finally, the end portions of the tube, including the end caps, are removed from the tube.
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Gorski Joseph M.
Neary J. Michael
Nelson Lawrence W.
The Boeing Company
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