Patent ID: 7431197
Filing Date: 2008-10-07
Classification: B21D,B23K,F01D,Y10T

Abstract:
1. A method of fabricating a hollow mechanical part by diffusion welding and superplastic forming, the method comprising the following steps: a) providing at least two primary parts of superplastic material, said primary parts having two faces and a periphery; b) providing an anti-diffusion substance and depositing said anti-diffusion substance in a predefined pattern on at least one face of said two faces of said primary parts; c) stacking-up and assembling said primary parts together at their said periphery, with the exception of a passage-forming location, said primary parts forming a stack and defining between them a cavity, said at least one face being placed facing into said cavity; d) diffusion welding the stack under isostatic pressure; e) placing the welded assembly in a mold; and f) raising said mold to the superplastic forming temperature and injecting an inert gas at the superplastic forming pressure via said passage into said cavity, thereby causing the stack to inflate and implementing superplastic forming, enabling a blank of the mechanical part to be obtained; wherein step b) is performed in application of the following sequence of operations: