B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/11, 22/159
B22C 9/12 (2006.01) B22D 41/50 (2006.01)
Patent
CA 1075427
ABSTRACT OF THE DISCLOSURE The present invention provides a method of hardening foundry cores made of a mixture which includes sand curable compounds in which, to harden the core, the core is exposed to a core-forming apparatus and to a mixture of a gaseous catalyst and a carrier gas, and to compressed air, wherein, in order to accurately predetermine the volume, pressure and temperature of the gaseous catalyst-carrier gas mixture, and of the compressed air being applied to the core, the method comprises the step of segregating and temporarily storing the mixture of gaseous catalyst and carrier gas in a first vessel (8); segregating and temporarily storing compressed air in a second vessel, the volume pressure, and the temperature of the compressed air both being higher than the volume pressure and temperature of the gaseous catalyst - carrier gas mixture; rapidly injecting such stored mixture of gaseous catalyst - carrier gas into the core forming apparatus; and then suddenly and abruptly and rapidly injecting said compressed air at said elevated temperature and with said higher volume into the core forming apparatus. The invention also provides an apparatus for use in the method.
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