FIELD: metallurgy.
SUBSTANCE: surface of the working cavity of the casting mould and the rod is coated with a continuous layer of liquid glass water solution in ratio 1:3, on which chromite sand of coarse fractions (1-0.4 mm) with sharp triangular shape of grains is applied. Casting half molds and rods are dried at temperature of 70-80°C, residues of unglued sand are removed prior to assembly of molds.
EFFECT: higher mechanical properties of metal in surface layer of cast items at temperature of crystallisation intervals, castings resistance to formation of hot cracks.
1 cl, 1 tbl, 1 ex
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