Hot Sand Weil McLain’s H


ot sand can lead to deteriorated physical properties and molding


problems, but it is difficult to avoid. The only methods of eliminating the issue are to stop recirculating return green sand or employ some means of cooling the return sand


before its reuse. Due to cost con- straints, most metalcasters live with hot sand, take measures to minimize its effects or take the necessary steps to cool the sand. Weil McLain, Michigan City,


Ind., experienced widely varying sand temperatures at its ferrous cast-


ing facility. The elevated tempera- tures led to sand inclusion defects and scrapped castings. In Septem- ber 2008, the plant incorporated a system to cool the return sand from shakeout after it passed through a rotary screen. By cooling the sand prior to the mulling-mixing pro-


Fig. 1. Weil McLain found that when sand temperature was high on Monday and Wednesday (b and d), green compression strength decreased (a and c). 32 | MODERN CASTING July 2011


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60