METHOD FOR PREPARING SAND FOR MAKING MOLDS AND CORES WITH GYPSUM BINDER AT PRODUCING CASTINGS OF NON-FERROUS AND PRECIOUS METALS

摘要

foundry. SUBSTANCE: method for preparing sand comprises steps of agitating sand ingredients and vacuum treatment of sand; simultaneously with vacuum treatment applying to sand ultrasonic oscillation field for 2-6 min. Combination of ultrasonic and vacuum treatment processes provides intensive separation of air bubbles from treated sand. EFFECT: enhanced rheological properties of sand and physico-mechanical characteristics of molds and cores. 1 tbl