Hot box core making

Details Hot box core making Hot box core making

B - Operations, Transporting

22

C

B22C 7/06 (2006.01) B22C 9/12 (2006.01)

Patent

CA 2138568

A hot box core making apparatus having a core box having a thick walled cope and a thin walled metal drag mating in essentially a horizontal parting plane, the cope and drag each having ports therethrough screened to prevent passage of sand, the ports communicating with the interior of the core box; one or more resilient seals that seal and reseal the cope and drag at plane; convection heater delivering a heated gas, to drag ports and thence out through the ports of the cope, the convection heater having a heat conductive manifold attached to and along the draft for augmenting the heat of the gas st it passes to the ports of the drag; and conduction heater (burner units) directly heating both the cope and manifold and thereby the interior of the core box by conduction. The convection heater heats the gas in two stages, first to a temperature level outside said core box and manifold and thence to a second temperature level elevated by exposure to said manifold. The temperature levels are respectively about 175-225°F and 250-290°F.

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