METHOD FOR MELTING OUT OF PATTERNS FROM SHELL MOLDS Russian patent published in 1998 - IPC

FIELD: metallurgy; may be used at machine-building works of many industries. SUBSTANCE: ready for melting out of patterns block molds are preliminarily installed in airtight chamber insulated from heat carrier and strengthened by building up pressure with cooling air injection. Upon attainment in chamber of pressure of the required value, heat-insulating partition is removed and block molds are immersed into heat carrier medium. After completion of pattern melting out, shell molds are withdrawn from the heat carrier medium and pressure is relieved. EFFECT: full elimination of rejects resulted from cracks in shell molds. 3 cl, 2 dwg, 1 tbl