The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1998
Filed:
Aug. 08, 1996
John O Fowler, Shropshire, GB;
Arnold J Pratt, Derbyshire, GB;
Rolls-Royce plc, London, GB;
Abstract
A plurality of hollow blades are produced by assembling a plurality of titanium sheets and a plurality of titanium blocks into a stack. At least one of the sheets is provided with a stop off material on one of its surfaces at a plurality of longitudinally spaced pre-selected areas to prevent diffusion bonding at these areas to define the hollow interiors of the blades. The edges and ends of the sheets are welded together and the blocks are welded to the sheets. The assembly is heated and externally pressurised to diffusion bond the sheets and blocks together. The integral structure so formed is then heated and internally pressurised to superplastically form at least one of the sheets at each of the pre-selected areas to produce a plurality of hollow blades. Thereafter the hollow blades are separated from each other by machining and simultaneously producing the aerofoil shapes.