Core box vent construction

Details Core box vent construction Core box vent construction

B - Operations, Transporting

22

C

B22C 7/06 (2006.01) B22C 9/10 (2006.01)

Patent

CA 2110562

- 8 - Abstract A novel core box vent useful in core making, comprising a porous cylinder of sintered ceramic materials, the pores of such cylinder being less than will allow intrusion of the grain size of sand to be introduced to the core box. A method of making cores using the above vent, comprising: providing mateable core box sections with blow tubes permitting introduction of an air fluidized sand mixture into the interior of the box sections and with one or more ceramic core box vents in an exhaust side of the mating core box sections to permit egress of air used to fluidize the sand mixture, the vents having a labyrinth of passages or pores smaller in diameter at least than the average grain size of the sand in the mixture; blowing a sand and resin mixture into the interior of the mated core box sections, such resin laden sand grains being prevented from egress from the mated core box sections, such resin being curable to polyurethane by chemical reaction; blowing a catalyst curing gas through the mixture via said blow tubes; and purging the mixture with air.

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