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US 6,199,274 B1Granted
Method of making oil scraper piston rings
AssigneeFederal-Mogul Burscheid GmbH
InventorKarlfried Preyer
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Abstract
A method of making an oil scraper piston ring includes the following steps of providing a base ring body including a circumferential web having flanks and an outer circumferential surface; galvanically depositing on the web a wear resistant hard chromium layer having solid particles embedded therein; applying a break-off resistant cover layer to the hard chromium layer; and grinding the cover layer to provide the outer circumferential surface of the web with sharp bounding edges
Claims11
A method of making an oil scraper piston ring comprising the following steps:
- (a) providing a base ring body including a circumferential web having flanks and an outer circumferential surface;
- (b) galvanically depositing on said web a wear resistant hard chromium layer having solid particles embedded therein;
- (c) applying a break-off resistant cover layer to said hard chromium layer;
- and
- (d) grinding said cover layer to provide said outer circumferential surface with sharp bounding edges.
2 more elements
Dependencies are inferred from the claim text.