The use of chromite sand and pearl sand in the casting process

Castings are prone to casting defects such as cracks, sticky sand, sand holes, pores and low collapsibility at hot joints and large fillets. The modeling method of mixing chromite sand and pearl sand in a certain ratio and placing them at the hot joints and large round corners of steel castings. Tests have proved that chromite sand and pearl sand can be effectively reduced when mixed in a certain ratio. The sticky sand, sand-packing and crack defects of the steel castings also improve the air permeability and collapsibility of the molding sand, and reduce the cost of castings.