Air holes were found around the hot section of the cut bucket tooth workpiece, and air holes were also found on the wall near the core cavity.

The pores in kneading castings can be divided into separating pores, intrusive pores and reverberation pores, and the formation of shrinkage cavities and shrinkage porosity in the casting is mostly accompanied by the separation of gas. The pores, shrinkage cavities and shrinkage porosity can be said Is associated. If the gas content in the alloy is too high, or the liquid metal invades too much gas during the filling process, it will aggravate the formation of shrinkage cavities or pores. After the analysis of the cutting bucket teeth, it can be seen that the pores are scattered randomly, and the pores are large, mostly spherical and spherical. It can be judged that the pores are basically invasive pores.