Electric heating – Inductive heating – Metal working
Patent
1995-05-26
1998-01-06
Hoang, Tu B.
Electric heating
Inductive heating
Metal working
219604, 219633, 228157, B23K 1301
Patent
active
057057940
ABSTRACT:
Our induction heating workcell permits rapid and controlled heating and cooling of a workpiece within a wide temperature range. The induction workcell allows us to combine manufacturing operations, like SPF, brazing, and annealing, into a single heating cycle to save time, energy, capital, touch labor, and factory space. Superplastic forming (SPF) and brazing occur at temperatures that differ by about 150.degree.-200.degree. F. (85.degree.-105.degree. C.) or more as do SPF and .beta.-annealing of titanium. We can combine these operations into an economical single cycle in which both operations are done during a single heating of the press Multisheet SPF parts with braze joints at selected locations are made by (a) heating a multisheet pack to its superplastic forming range below the melting point of the braze alloy, (b) superplastically forming the pack at the SPF temperature to form the sheets and to define braze joints having unmelted braze alloy, (c) increasing the temperature to the braze temperature of the braze alloy, and (d) cooling the pack below the superplastic range to freeze the braze alloy in the braze joint.
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Quarterly Government Report for Sep., 1992 through Nov.
Gillespie Franna S. P.
Matsen Marc R.
Hammar John C.
Hoang Tu B.
The Boeing Company
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