According to the characteristics of large shell diameter

wide range of inner barrel water jacket and uneven wall thickness for housing of electric bus motor

the influence of the complex structure of the water-cooled housing and the barrel-shaped sand core was analyzed on the sequential solidification of aluminum alloy low-pressure casting. Low pressure casting pouring system

mold structure and process parameters were designed. By using the AnyCasting software

the casting solidification process was simulated to predict the isolated liquid phase formed by the hot spot and the sand core separation caused by uneven wall thickness

which lead to defects such as shrinkage and cold shut in some locations. The solidification speed was optimized by adopting beryllium copper inserts

water-cooled inserts and air-cooled pipes to improve the soundness and production quality of the internal structure of the die casting housing.