Method for producing a piston ring
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United States of America Patent
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Jul 13, 2021
Grant Date -
May 7, 2020
app pub date -
Jul 13, 2018
filing date -
Jul 26, 2017
priority date (Note) -
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Abstract
A piston ring is produced from a main body made of steel or cast steel and comprising a running face, an inner circumferential surface, upper and lower flank regions, and transition regions from the running face to the respective flank region, by coating the running face and the transition regions with a first chromium layer, removing this first chromium layer at the running face down to the base material of the main body, providing at least the running face of the layer-free main body with a nitride layer, and, finally, coating the running face and the transition regions with at least one further chromium layer.
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