Method of repairing or modifying turbine blades

Patent 5092942 Issued on March 3, 1992. Estimated Expiration Date:

March 21, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

1751570

2632944

3449816

3528200

3564689

3660882

Refurbished turbine vanes and method of refurbishment thereof
Patent #: 4028787
Issued on: 06/14/1977
Inventor: Cretella , et al.

Method of repairing turbine blades
Patent #: 4866828
Issued on: 09/19/1989
Inventor: Fraser

Method of repairing turbine blades
Patent #: 4896408
Issued on: 01/30/1990
Inventor: Fraser

Turbine blade repair Patent #: 4953776
Issued on: 09/04/1990
Inventor: Fraser

Inventors

Assignee

Refurbished Turbine Components Limited

Application

No. 496986 filed on 03/21/1990

US Classes:

148/529, Iron(Fe) or iron base alloy present29/402.18, By applying fluent material, e.g., coating, casting29/402.21, Including heating29/889.1, Repairing or disassembling148/609With working

Examiners

Primary: Yee, Deborah

Attorney, Agent or Firm

Armstrong, Nikaido, Marmelstein, Kubovcik & Murray

Foreign Patent References

2054549 DE. 05/13/1972
309235 GB. 04/13/2012
1223730 GB. 05/13/1971
2091139 GB. 07/13/1982
2091140 GB. 07/13/1982
2124126 GB. 02/13/1984
2198667 GB. 06/13/1988
2208483 GB. 05/13/1989

International Class

C21D 008/00

Foreign Application Priority Data

1989-03-28 GB

Abstract

A method of repairing or modifying a turbine blade wherein damage or erosion has occurred to the end part of a turbine blade or it is required to remove the end part so as to improve the efficiency of the blade as a whole comprises the steps of removing the damaged end part or a part requiring replacement, securing a new piece of material to the blade which may or may not be partly preformed, and after securing of the new piece of material to the blade and heat treatment processes, subsequently working the new piece of material so that it conforms to the desired shape. The working of the new piece of material only after securement and heat treatment ensures that discontinuities such as lacing wire holes, shroud band apertures, tenons etc., are not left with concentrations of inbuilt stress due to the welding or heat treatment operations and if required the new part may be oversize material which ensures that if slight misalignment occurs between the blade and the new piece of material there is sufficient materia to enable the part to be worked to the correct shape.