发明授权
US4106977A Process for production of oil control rings 失效
油控环生产工艺

Process for production of oil control rings
摘要:
A process for the production of oil control rings having a scraper edge formed by a layer consisting of a wear-resistant material. The wear-resistant layer is embedded between two softer layers. Thereafter, the scraper edge is machined and the soft layers recessed by etching to expose the scraper edges.
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