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:
Jan. 10, 1989
Filed:
Jul. 23, 1987
Rodney G Wing, Middlesex, GB;
Rolls-Royce plc, London, GB;
Abstract
A circumferential array of aerofoil blades (11) comprising an aerofoil portion and a root portion is mounted on the periphery of a disc (14), sealed in place under vacuum and subsequently hot isostatically pressed to achieve diffusion bonding across the interface between the array (11) and the disc (14). Each of the root portion of the array (11) and the disc (14) is provided with axially extending flanges (12, 13, 15 and 16) at its axial ends. The flanges (12, 13, 15 and 16) are so dimensioned that when the array (11) is mounted on the disc (14) the flanges (12, 13, 15 and 16) engage each other in close fitting relationships in such a way that the array (11) and the disc (14) have an enclosed annular chamber radially spacing them apart. Annular chambers (18, 19) are provided at the interfaces of the confronting flanges (12, 13, 15 and 16), and the regions of the interfaces between the chambers (18) and the free axial ends of the flanges (12, 13, 15 and 16) are sealed by vacuum brazing. The outermost chambers (18) prevent the braze material from penetrating the interface between the array (11) and the disc (14), and from penetrating the second annular chambers (19). During hot isostatic pressing an enclosed annular chamber (20) collapses and diffusion bonding occurs between the array (11) and the disc (14) as well as between the flanges (12, 13, 15 and 16). The second annular chambers (19) are designed to collapse to provide a visual indication of the success of the pressing step.