External impurities such as slag, sand, and ash can infiltrate the cavity with molten iron during casting, resulting in sand holes and slag holes. These defects impair casting performance and increase costs. To ensure quality and efficiency, implementing effective impurity prevention measures is essential.

A. Use high-temperature resistant casting materials for packaging and special repair materials for local repairs: This helps ensure the integrity of the casting mold and prevents external impurities from entering the cavity due to mold damage.

B. Adopt high-performance slag removal and slag gathering agents: These agents can effectively separate and collect slag and other impurities in the iron flow, reducing the chance of them entering the cavity.

C. Ensure the pouring cup is more than 50mm above the sand surface, and cover adjacent pouring cups to be poured with protective covers. For unskilled casters, use asbestos cloth and other materials for protection around the pouring cup: This prevents sand, dust, and other impurities from falling into the pouring cup and being carried into the cavity with the iron flow.

D. Conduct education and training on the skills and literacy of operators: Skilled and responsible operators can better control the casting process, reducing the introduction of impurities due to improper operations.

E. Install filters, give priority to bottom pouring, and ensure the gating system has slag trapping functions: Filters can block large impurities, bottom pouring helps reduce the disturbance of the iron flow, and the slag trapping function of the gating system can further prevent impurities from entering the cavity.

F. Purchase inoculants from fixed points and store them properly: Qualified and well-preserved inoculants can avoid introducing additional impurities during the inoculation process, ensuring the quality of the iron water.

Implementing these steps cuts down on casting impurities, boots product quality, and strengthens enterprise competitiveness.