Patent ID: 6739029
Filing Date: 2004-05-25
Classification: B21D,B64D,Y10T

Abstract:
Process for manufacturing at least one metallic structure comprising a smooth outer skin, an inner skin and partitions connecting said skins by delimiting adjacent cells from each other, said process comprising the following successive steps: placing at least one stack of three metallic plates superposed in a mold, said mold comprising a surface complementary to the smooth outer skin of the structure to be made, inserting an anti-diffuser between the plates in regions that are not to be assembled; heating the stack of plates and executing a plate diffusion welding cycle, outside said regions that are not to be assembled; partially forming the cells and shaping the structure with a first phase in a pressure cycle, consisting of applying a first pressure in first regions delimited between a first plate adjacent to said surface of the mold and an intermediate plate in said stack and applying a second approximately constant pressure independent of and lower than the first pressure, on the face of the third plate opposite said surface and in second regions delimited between the third plate and the intermediate plate; final conformation of the cells and the outer skin by carrying out a second phase in the pressure cycle consisting of simultaneously applying an approximately equal pressure in the first and second regions and on said face of the third plate.