Domed structures and a method of making them by superplastic for

Details Domed structures and a method of making them by superplastic for Domed structures and a method of making them by superplastic for

1991-04-19

1992-09-01

Ramsey, Kenneth J.

Metal fusion bonding

Process

With shaping

228193, 228265, 428593, 294551, 220469, 244119, 52 80, B23K 2018, B23K 2802, B21D 4700

Patent

active

051432765

ABSTRACT:
The present invention provides a method of making a domed structure using superplastic forming and diffusion bonding techniques. The dome is of a deep and/or irregular shape that cannot be achieved by creep forming. The method includes the step of forming a stack of two or more sheets made of superplastic material and the sheets of the stack being joined together in face to face contact by metallic bonds such that no sheet in the stack is bonded to more than one of its neighbouring sheets; the metallic bonds preferably lie on lines extending radially from and/or circumferentially around the said peak. The resulting stack is heated to superplastic termperatures and a pressure differential is established across the stack to form it into a domed shape. The resulting dome is placed in a mould and heated; an inert gas is injected between the sheets to inflate the stack superplastically thereby forming a space between the sheets which is divided into cells by webs formed from two of the said sheets that have been superplastically formed by the inflation process.

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