METHOD FOR MAKING CORES AND MOLDS WITH USE OF GYPSUM BINDER AT MAKING CASTINGS OF FERROUS AND NON-FERROUS ALLOYS Russian patent published in 2003 - IPC

Abstract RU 2214314 C1

FIELD: foundry, possibly manufacture of complex-profile castings with different size and mass. SUBSTANCE: method comprises steps of preparing suspension with gypsum binder; performing vibration vacuumizing of said suspension and pouring suspension into fitting out part; after solidifying impregnating received cores and molds by dipping them into solution of silicone vanish at continuously acting upon said solution by means of ultrasonic field with intensity (0.5 - 5)10³ Wt/m² in order to enhance capillary impregnation; in addition treating vanish solution by means of nanosecond electromagnetic pulses with specific power 400 - 900 Wt/m² in order to lower viscosity of vanish solution and to increase moistening and impregnating capability of solution; at final stage calcining cores and molds. EFFECT: enhanced strength, accuracy, increased cracking resistance, improved knocking out capability of cores and molds. 2 cl, 2 tbl

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RU 2 214 314 C1

Authors

Znamenskij L.G.

Dates

2003-10-20—Published

2002-09-30—Filed