Superplastic forming diffusion bonding process
US4882823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1988 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Jan 27, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49805
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method is set forth of forming a hollow structure having a varying mass distribution. Two sheets of a diffusion bondable and superplastic formable material are formed with one flat surface and an opposite surface contoured to have a selected mass distribution. A stop-off material is applied between selected non-peripheral portions of each of the flat surfaces whereat diffusion bonding is to be prevented and superplastic forming is to be required. An intermediate flat core sheet may also be present. The flat surfaces are positioned in abutting relation to each other or to the intermediate flat core sheet. The sheets are subjected to diffusion bonding conditions. The sheets are superplastically formed to expand them apart against a die. The invention also provides a method of preinflating contoured sheets prior to superplastically forming them to avoid truss core rupture. Hollow aircraft engine components are formed by the methods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.