Abstract
A study of the surface fatigue phenomena in the sliding wear of cams for circular knitting machines. These components control the needles of knitting machines and are subjected to periodic loading of very high frequency; the impacts can reach 30,000/min. Study of wear tracks on cams, after different periods in service, revealed characteristic surface fatigue type damage. Electron microscopic examination in combination with a stress analysis showed an interrelationship between the structure of the material and the surface texture of wear tracks. In order to reduce the surface damage different types of steels have been studied together with surface treatments such as hardening, carburising, nitriding and carbonitriding. Comparative results of both laboratory and industrial tests are given. The replacing of the generally used high chromium steel with different types of case-hardening steels, adequately heat treated is suggested.
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