Apparatus and method for making laminate structures

Metal fusion bonding – Process – Using bond inhibiting separating material

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228157, B23K 120

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active

045777977

ABSTRACT:
An improved apparatus and forming method is disclosed for making laminate structures from a stack of worksheets using superplastic forming and diffusion bonding. A fluid line is inserted into the forming die which is connected to the stack by a slot in one sheet. A sheet is coated with a stopoff material to prevent bonding of selected areas of the sheets. The slot is positioned adjacent to the stopoff path and an inflation tube having an internal bore is inserted into the slot. The tube material is noncontaminating relative to the worksheet materials, and the tube material has a high compressive strength sufficient to form a groove in one worksheet without diminishing the bore area. When the tube is thicker than the sheet having the slot in it and the tube is subjected to compressive forces by the forming die, the tube acts as a male die and pushes out a groove in a surrounding worksheet without substantially changing the structure of the tube. Gas is fed into the fluid line, and into the stack of sheets creating a pressure differential within the stack for diffusion bonding and superplastic forming.

REFERENCES:
patent: 4315128 (1982-02-01), Matcovich et al.
patent: 4331284 (1982-05-01), Schulz et al.

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