我厂生产的2105柴油机凸轮轴用QT60-2稀土镁球墨铸铁制成。凸轮轴外形见图1所示。最后热处理采用等温淬火。一般来说等温淬火的内应力较小,不易产生开裂.但凸轮轴在等温淬火后仍有发生开裂现象。我们对等 The 2105 diesel engine camshaft made by our factory is made of QT60-2 rare earth magnesium nodular cast iron. Camshaft shape shown in Figure 1. The final heat treatment isothermal quenching. Generally speaking, the internal stress of isothermal quenching is small, not easy to crack, but the camshaft is still cracked after isothermal quenching. We are equal