SAND MOLD FOR PRODUCTION OF CASTINGS Russian patent published in 1998 - IPC

FIELD: foundry, in particular, sand mold for production of small and medium castings. SUBSTANCE: sand mold has inserts with thermit or with surface-alloying material located in mold or cores. Inserts are made of cardboard and in the form of cylinder, cube, parallelepiped, plate, rings. To increase thermal stability, inserts are impregnated or coated with inorganic and organic materials. EFFECT: higher yield of cast materials and its quality, and saved exothermic materials. 3 cl, 5 dwg