FIELD: foundry.
SUBSTANCE: core or industrial equipment is filled with a mixture containing solid carbon dioxide ("dry ice") in the form of particles with size of 0.5-2.0 mm in amount of 5-7 wt%. Mixture is compacted and hardened by passing hardener gas through a mixture on one side of the rod or mold with its simultaneous extraction by evacuation from the opposite side. Gas-hardener is first heated to 180-200°C.
EFFECT: high level and stability of knockout capacity, strength properties, gas permeability and uniform distribution of said properties over the body of the molds and rods.
1 cl, 3 tbl
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SU1547936A1 |
