(57) A process for forming superplastically deformable sheet metal into contoured shapes,
especially complex saddle shapes having compound curvature, utilises the technique
of pressure forming in combination with a forming tool with the sheet metal in condition
for superplastic deformation. A preform of superplastically deformable sheet metal
is first formed and then sealed to a pressure box. A forming tool is engaged with
the preform face external of the pressure box and, under conditions for superplastic
deformation, the sheet metal is pressure-formed into conformity with the forming tool.
Apparatus for performing the process is also disclosed.
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