Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1997-10-10
1998-10-20
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 61, 72709, B21D 2602
Patent
active
058230343
ABSTRACT:
A superplastic forming (SPF) method using a self-contained die obviates the need for external containment bands or rings. The method and die are particularly advantageous for use in forming generally planar parts but may also be used to form parts of a more cylindrical shape. The die includes two or more die segments, each of which is unitarily formed from a suitable material such as graphite or ceramic. Each die segment has a unitarily formed connecting portion for interlocking it to another die segment. The connection portion may be a tab having a bore through which a pin may be extended to interlock the die segments. The die may swing open and closed in a hinged manner or be completely separable. In accordance with the method, a gas-tight preform assembly made of a metal such as titanium alloy is placed in the die. The die and preform assembly are heated in a vacuum furnace. Gas is injected into the preform assembly, expanding it to conform to the shape of the interior of the die. Upon cooling, the assembly is removed and trimmed to separate the finished part.
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Hyperform Technologies, Inc.
Jones David
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