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.
申请公布号
US4882823(A)
申请公布日期
1989.11.28
申请号
US19880149216
申请日期
1988.01.27
申请人
ONTARIO TECHNOLOGIES CORP.
发明人
WEISERT, EDWARD D.;FISCHER, JOHN R.;MCCAULEY, WILLIAM L.