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本文初步分析了凸轮轴激冷白口层显微组织对早期磨损的影响及控制办法.指出,影响凸轮轴早期磨损的众多原因中,白口层中粗大碳化物、过量的石墨和粗大的初生奥氏体枝晶可能是凸轮轴早期磨损的原因之一.合理的调整化学成分和冷铁尺寸之间的匹配是获得良好白口层的关键,而含碳量则是影响白口层硬度的主要因素,并推出近似经验公式:HRC=21.2C-25.浇注温度应控制在1420℃以下为宜.
In this paper, the effects of camshaft chill white stratum microstructure on the early wear and tear and the control measures are analyzed preliminarily.It is pointed out that among the many reasons that affect the early wear of camshafts, coarse carbides, excess graphite and coarse primary Austenite dendrites may be one of the causes of early wear of camshafts.Reasonably adjusting the match between chemical composition and chill size is the key to good white stratum and carbon content is the effect of white stratum hardness The main factors, and the introduction of an approximate empirical formula: HRC = 21.2C-25. Pouring temperature should be controlled below 1420 ℃ is appropriate.