B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/11
B22C 13/08 (2006.01) B22C 13/12 (2006.01)
Patent
CA 1085576
ABSTRACT A machine is disclosed for producing rigid sand cores from a molding mixture of a refractory granular material such as sand and a hardenable binder. These rigid sand cores then are used in foundries for metal casting. The machine of the present invention is capable of producing several different types of rigid sand cores including hollow shell sand cores, hot box cores and cold box cores. The machine includes means for curing the molding mixture used to produce shell sand cores and hot box cores by applying heat to the molding mixture after it is placed in a core or molding box. Other means are provided in the machine for curing cold box cores by applying a gas catalyst to the molding mixture after it is placed in the core box. The machine of the present inven- tion is automatically controlled by a circuit arrangement which can be programmed by the machine operator. A selec- tor switch in the circuit arrangement enables the machine operator to select the type of operation to be performed by the machine, that is, the production of one of at least three types of sand cores including shell sand cores, hot box cores, or cold box cores. The circuit arrangement further includes a plurality of timers which can be re- programmed for each of the different operations performed on the machine. Thus, a high degree of circuit economy is achieved by using many of the circuit elements to per- form multiple functions and by using other circuit elements to perform the same function in each of the different operations performed on the machine.
287519
Gowling Lafleur Henderson Llp
International Minerals & Chemical Corporation
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