Fig. 4.22. Four-Sheet SPF/DB
in the two-sheet process, the tools have the more gentle curvature of the inner and outer part moldlines. The completed parts are pickled to remove any alpha case that may have formed at elevated temperature.
Superplastic forming and SPF/DB of titanium has been successfully used on a number of aircraft programs. An example is the F-15E, shown in Fig. 4.23, in which these processes allowed the elimination of over 726 detail parts and over 10000 fasteners.
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