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Enhanced bearing durability rotating member method and apparatus

A rotating component, durability technology, applied in the direction of bearing elements, bearings, shafts and bearings, which can solve the problem of premature rotor failure

Inactive Publication Date: 2007-09-19
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, SAW processing often leaves defects embedded in the weld metal which, if not detected or corrected, can also lead to premature rotor failure

Method used

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  • Enhanced bearing durability rotating member method and apparatus
  • Enhanced bearing durability rotating member method and apparatus
  • Enhanced bearing durability rotating member method and apparatus

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Embodiment Construction

[0043] Referring to the accompanying drawings, several embodiments of the disclosed apparatus and method will be described in detail herein by way of example and not by way of limitation.

[0044] Referring to FIG. 1 , a partial cross-sectional view of a rotating part of a turbine rotor according to an embodiment of the invention shown in the embodiments is described. A cylindrical bearing surface (journal) 14 of the turbine rotor 10 is oriented horizontally and concentrically with a longitudinal rotor shaft 16 . Orthogonal to, and thus perpendicular to, the rotor shaft 16 and journal 14 are a first thrust bearing surface 18 and a second thrust bearing surface 22 . A first vertical thrust bearing surface 18 prevents axial movement of the rotor in one direction, while a second vertical thrust bearing surface 22 opposite first thrust surface 18 prevents movement of the rotor 10 in the opposite direction. Bearings (not shown) carried on the thrust bearing surfaces 18, 22 of the ...

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Abstract

Disclosed herein is a method of preparing a rotating member (10) to enhance bearing durability comprising, applying a metal material (12) to a surface (26) of the rotor (10) orthogonal to a longitudinal axis (16) of the rotor (10), the material (12) having a chromium content less than a chromium content of the rotating member (10), and surfacing said metal material (12) orthogonal to the axis (16) of the rotor (10). Further disclosed herein is an enhanced bearing durability rotating member (10) comprising, a rotor (10) with a metal material (12) surface (18, 22) orthogonal to a longitudinal axis (16) of the rotor (10) having less chromium content than the rotor (10), and a boundary layer (26) between the metal material surface (18, 22) and the rotor (10) orthogonal to the axis (16) of the rotor (10).

Description

technical field [0001] The present invention relates to the chemical composition of steel for turbine rotors, and in particular to the chromium content of the steel bearing surfaces of the rotors. Background technique [0002] Turbine rotors are generally cast from steel containing more than nine percent chromium. Such rotors are well suited to meet most turbine rotor requirements including chemical resistance and stress loads. One problem, however, is that such high chromium levels have been shown to cause "steel wool". Steel wool is a way to damage bearings that rest on high chrome metal. Therefore, it is not uncommon for bearings to experience steel wool failure when supported on vertical bearing thrust surfaces and horizontal cylindrical surfaces when the surfaces have high chromium content. One method used to reduce steel wool is to apply an intermediate metal material with a chromium content of less than 2.2 weight percent between the turbine rotor and the bearing. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/23B23K35/22B23K9/16F01D5/28C21D9/50
CPCF16C33/14F16C17/04F01D25/005F16C2223/46C23C26/00
Inventor S·V·坦布E·K·埃利斯W·H·小蔡尔兹L·B·斯皮格尔
Owner GENERAL ELECTRIC CO