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Method of manufacturing an article by superplastic forming and diffusion bonding

  • US 5,479,705 A
  • Filed: 06/07/1994
  • Issued: 01/02/1996
  • Est. Priority Date: 05/01/1992
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing an article by superplastic forming and diffusion bonding at least two metal workpieces comprising the steps of(a) applying a stop off material to prevent diffusion bonding to preselected areas of at least one of the surfaces of at least one of the at least two metal workpieces,(b) assembling the at least two workpieces into a stack relative to each other so that the surfaces are in mating abutment,(c) applying heat and pressure across the thickness of the at least two workpieces to diffusion bond the at least two workpieces together in areas other than the preselected areas to form an integral structure,(d) heating the integral structure and applying loads to opposite ends of the integral structure to twist one end relative to the other end to contour the integral structure to a predetermined shape,(e) heating the twisted integral structure to a temperature at which the metal is plastic and internally pressurising the twisted integral structure to break the adhesive bond between the stop off material and the at least one workpiece in the preselected areas,(f) heating the twisted integral structure and internally pressurising it to cause the preselected areas of at least one of the workpieces to be superplastically formed to produce an article of predetermined shape.

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