Before sand casting, it is necessary to use resin additives to solidify the sand in the mold to achieve a certain shape and strength. The content of resin additives in the sand mold has a great influence on the forming effect of the casting. Because sand molds are mostly used for high-temperature melt casting, resin additives with lower boiling points will rapidly vaporize during the melt casting process, thereby bringing airflow into the cavity; in addition, the melt may also be involved in the filling process. gas, and produce shrinkage porosity or porosity defects after solidification. When the mold is prepared, adding too little resin will also lead to low strength of the mold, which cannot be formed and used, or is impacted and collapsed by the high-temperature melt during pouring, resulting in a casting accident. Therefore, the appropriate resin additive content can ensure the use strength of the casting mold, and can also reduce the amount of gas generated during the casting process, which is beneficial to the high-quality forming of the casting.