Treatment process for a central bore through a centrifugal compressor wheel to create a deep cylindrical zone of compressive residual hoop stress on a fractional portion of the bore length, and compressor wheel resulting therefrom
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United States of America Patent
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Oct 18, 2022
Grant Date -
Dec 24, 2020
app pub date -
Apr 28, 2020
filing date -
Jun 24, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A process for cold working of the inner surface of a bore in a centrifugal compressor wheel along only a fractional portion of the bore length (i.e., along less than a full axial length of the bore), thereby creating a zone of compressive residual hoop stress in the metal surrounding the bore where the wheel needs the beneficial residual stress. The process purposefully avoids cold working of the bore at locations adjacent to high-stress areas and features of the wheel, where cold working in such locations could negatively impact the wheel's overall life.
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