Metal fusion bonding – Process – With shaping
Patent
1979-12-10
1985-07-02
McQuade, John
Metal fusion bonding
Process
With shaping
B23K 3102
Patent
active
045263124
ABSTRACT:
A method of making metallic sandwich structures is disclosed using a plurality of metal blank workpieces with at least one of the blank workpieces capable of being superplastically formed against a surface of a die. At least one of the blanks is treated at selective areas to prevent bonding in those areas. The blanks are positioned in a stack with at least one of the outer workpieces of the stack having the capacity to be superplastically formed. The stack is then diffusion bonded together in the untreated areas. At least one insert, preferably made from wax, is coupled to the bonded stack such that the external configuration of the at least one insert and bonded stack conform to the external configuration of the sandwich structure. A mold is cast around the at least one insert and bonded stack, after which the at least one insert is removed from the mold. Thereafter, the bonded stack is superplastically formed within the cast mold, resulting in the desired sandwich structure. In a second embodiment, wherein the metallic structure has a curvature, the stack may be either formed to the curvature of the sandwich structure and then diffusion bonded or simultaneously formed to the curvature of the sandwich structure and diffusion bonded in the untreated areas of the blanks. Thereafter, at least one insert is coupled to the curved and diffusion bonded stack, such that the combination has the external configuration of the sandwich structure to be formed. A mold is then cast about the curved and bonded stack and the at least one insert, after which the insert is removed from the mold. The curved and bonded stack is then superplastically formed in the cast mold to sandwich structure.
REFERENCES:
patent: 3196506 (1965-07-01), Operhall et al.
patent: 3206810 (1965-09-01), Hockin et al.
patent: 3422880 (1969-01-01), Brown et al.
patent: 3927817 (1975-12-01), Hamilton et al.
patent: 4154282 (1979-05-01), Kull
Goss Joseph R.
Schulz David W.
McQuade John
Rockwell International Corporation
Silberberg Charles T.
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