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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.:

US 9732394 B1

PDFFull Text
Date of Patent:
Aug. 15, 2017

Filed:

May. 17, 2012

Manufacturing process for aerospace bearing rolling elements

Applicants:

Herbert A. Chin, Charlotte, NC (US);

William P. Ogden, Glastonbury, CT (US);

David A. Haluck, Stuart, FL (US);

Sean Mccutchan, Glastonbury, CT (US);

Ronald F. Spitzer, Charlotte, NC (US);

Allen V. Keller, Torrington, CT (US);

Inventors:

Herbert A. Chin, Charlotte, NC (US);

William P. Ogden, Glastonbury, CT (US);

David A. Haluck, Stuart, FL (US);

Sean McCutchan, Glastonbury, CT (US);

Ronald F. Spitzer, Charlotte, NC (US);

Allen V. Keller, Torrington, CT (US);

Assignee:

UNITED TECHNOLOGIES CORPORATION, Farmington, CT (US);

Attorney:

Cantor Colburn LLP

Primary Examiner:

Jessee Roe

Assistant Examiner:

Anthony Liang

Int. Cl.
CPC ...
C21D 7/06 (2006.01); C23C 8/26 (2006.01); C23C 8/36 (2006.01); C23C 8/50 (2006.01); C23C 8/02 (2006.01); C23C 8/80 (2006.01); C21D 1/76 (2006.01); C21D 9/36 (2006.01); C21D 9/40 (2006.01); B24B 11/02 (2006.01); B24B 19/06 (2006.01); B24B 31/02 (2006.01); B24B 1/00 (2006.01); F16C 33/32 (2006.01);
U.S. Cl.
CPC ...
C21D 7/06 (2013.01); B24B 1/00 (2013.01); B24B 11/02 (2013.01); B24B 19/06 (2013.01); B24B 31/02 (2013.01); C21D 1/76 (2013.01); C21D 9/36 (2013.01); C21D 9/40 (2013.01); C23C 8/02 (2013.01); C23C 8/26 (2013.01); C23C 8/36 (2013.01); C23C 8/50 (2013.01); C23C 8/80 (2013.01); F16C 33/32 (2013.01); F16C 2223/02 (2013.01); F16C 2223/10 (2013.01); F16C 2360/23 (2013.01); Y02P 10/212 (2015.11); Y10T 29/47 (2015.01);
Abstract

A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris.

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