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球墨铸铁凸轮轴

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球墨铸铁是20世纪50年代发展起来的一种高强度铸铁材料,其综合机械洼能接近于钢,因铸造性能很好、成本低廉、生产方便,在工业中得到了广泛的应用。球墨铸铁的成分要求比较严格,与灰口铸铁相比,它的含碳量较高,通常在4.5%4.7%范围内变动,以利于石墨球化。球墨铸铁的抗拉强度远远超过灰口铸铁,而与钢相当。因此对于承受静载的零件,使用球墨铸铁比铸钢还节省材料,而且重量更轻。不同基体的球墨铸铁,性能差别很大,球墨铸铁具有较好的疲劳强度,实验表明,球墨铸铁的扭转疲劳强度甚至超过45钢。在实际应用中,大多数承受动载的零件是带孔或带台肩的,因此用墨铸铁来制造某些重要零件,如曲轴、连杆和凸轮轴等。
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