. Transactions. ow-holes in the casting was the presence of air in the Fig. 7 is shown another die-casting machine in which the vacuumprinciple is applied; here the vacuum is applied directly to the die. The production of die castings free from blow-holes has been the mostserious problem confronting die-casting manufacturers. At varioustimes it has been stated that processes capable of producing solid andhomogeneous die castings have been developed. If all blow-holes indie castings were caused by air coming in contact with metal, the vacuumprocess would deserve consideration. That the p
. Transactions. ow-holes in the casting was the presence of air in the Fig. 7 is shown another die-casting machine in which the vacuumprinciple is applied; here the vacuum is applied directly to the die. The production of die castings free from blow-holes has been the mostserious problem confronting die-casting manufacturers. At varioustimes it has been stated that processes capable of producing solid andhomogeneous die castings have been developed. If all blow-holes indie castings were caused by air coming in contact with metal, the vacuumprocess would deserve consideration. That the presence of blow-holes CHARLES PACK 579 in some die castings are due to other and more serious causes, the writerwill endeavor to prove. In Fig. 8 is shown a cross-section of a casting that can be gated at Aor B; in the best foundry practice the gate A would probably be first metal that goes into the die will chill around the inner wallsand take the form shown in the shaded portion. The gate may then be-. J^S
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
