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本文讨论了凸轮挺柱擦伤失效的机理及其模拟试验结果。研究表明,在较软的金属基体上均布着一定形状、一定数量的硬质相以及石墨,特别是片状石墨的金相组织,能有力地改善抗擦伤性能;摩擦副一方经磷化处理、硫浴处理和氮化处理能显著地改善抗擦伤性能;凸轮的硬度必须低于挺柱硬度,其硬度差随材料工艺不同而异;冷激铸铁挺柱经淬火处理增加擦伤倾向,故淬火后的冷激铸铁挺柱必须施行抗擦伤表面处理。本文还列出了各种材料工艺匹配的凸轮挺柱摩擦副的临界擦伤接触应力。
This paper discusses the failure mechanism of cam tappet abrasion and its simulation test results. The research shows that a certain amount of hard phase and graphite, especially the flaky graphite microstructure, are evenly distributed on the softer metal substrate, which can effectively improve the anti-galling performance. One side of the friction pair is phosphated Treatment, sulfur bath treatment and nitriding treatment can significantly improve the anti-galling performance; the hardness of the cam must be lower than the tappet hardness, the hardness difference with the material process varies; chilled cast iron tappet hardened to increase the tendency to bruise , So after quenching the cast iron tappet must be anti-scratch surface treatment. The article also lists the critical abrasion contact stress of the cam tappet friction matching with various materials and technology.