Method of curing hot box sand cores

Details Method of curing hot box sand cores Method of curing hot box sand cores

B - Operations, Transporting

22

C

B22C 1/22 (2006.01) B22C 7/06 (2006.01) B22C 9/12 (2006.01)

Patent

CA 2138567

A method of making resin bonded sand cores using heat activated catalysts comprising: providing a core box having (i) a thermally conductive cope and drag resiliently sealingly mating at essentially a horizontal parting plane, and (ii) core defining walls enclosing an interior and perforated by sand-filtered ports; blowing a sand, resin and liquid catalyst mixture into said interior to form a sand body; conductively heating at least the outer skin of said sand body to a first temperature (i.e., 300-400°F); and essentially simultaneously with said conductive heating, convectively heating (in two stages) the remainder of said sand body by flowing a heated gas therethrough at a second temperature lower than said first temperature (i.e., 250-290°F), said heated gas entering said sand body from the drag and exiting said sand body by way of said cope.

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