Method of manufacturing structural parts, particularly for use in aircraft
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United States of America Patent
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-
Mar 21, 2000
Issued Date -
N/A
app pub date -
Nov 26, 1997
filing date -
Dec 16, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a method of making a frame, particularly for the aircraft industry, having a central member (34) and one or more cantilever ribs (32); such a frame can be made by forging or machining but these are time-consuming and expensive. According to the present invention such frames are made by diffusion bonding and superplastic forming techniques, whereby a pack of sheets are bonded together except in certain areas. Gas is injected into those areas to inflate the pack superplastically to form one or more closed cells (16). The top of the cells is then machined off along line 23, while the side walls of the cells are retained, to provide a frame having cantilever ribs (32).
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