Manufacturing process for aerospace bearing rolling elements
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United States of America Patent
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Aug 15, 2017
Issued Date -
N/A
app pub date -
May 17, 2012
filing date -
May 17, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
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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Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- C23C Class
- 27.20 % this patent is cited more than
- 8 Age
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