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冷激铸铁凸轮轴是采用冷激铸铁毛坯制造。冷激铸铁凸轮轴的耐磨表面是针状碳化物,凸轮表面储油能力强,有良好的耐磨性。是轿车等高速发动机凸轮轴的理想材料。缺点是:冷激铸铁材料工艺适用性差,其铸造质量受铸造过2程中的化学成分(炉料配比)型砂和铸造工艺的影响较大,心部缩孔率高,表面裂纹多,难以获得稳定和完全合格的珠光体凸轮轴毛坯,致使凸轮轴断裂率高,使用寿命差,制造过程的产品合格率低和质量不稳定,装机后发动机故障率高等问题。
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