Application of Air Quenching Technology to Engine Cylinder Head

This paper mainly introduces the application technology of air quenching in the engine cylinder head casting process of our company. After the casting is pushed out of the mold, air quenching is carried out immediately, and then T5 aging treatment. In the continuous production with air quenching, the start cooling temperature is 494 °C, the final cooling temperature is 122 °C, the cooling rate is 33.8 °C·min−1. Compare the mechanical properties and residual stress of T5 air quenching and T7 water quenching, the tensile strength and elongation of air quenching are reduced by 6.6% and 46.1% respectively, with a small difference in hardness and a reduction in residual stress by 62.2%.